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- .rs
- .\" Troff code generated by TPS Convert from ITU Original Files
- .\" Not Copyright ( c) 1991
- .\"
- .\" Assumes tbl, eqn, MS macros, and lots of luck.
- .TA 1c 2c 3c 4c 5c 6c 7c 8c
- .ds CH
- .ds CF
- .EQ
- delim @@
- .EN
- .nr LL 40.5P
- .nr ll 40.5P
- .nr HM 3P
- .nr FM 6P
- .nr PO 4P
- .nr PD 9p
- .po 4P
-
- .rs
- \v | 5i'
- .LP
- \(sc 3 Suppl\*'ement n\uo\d 3 au d\*'ebut de cette page
- .sp 2P
- .LP
- \v'20P'
- \fB4\fR \fBOverall Performance Index model for Network Evaluation
- (OPINE)\fR (contribution by NTT)
- .sp 1P
- .RT
- .sp 1P
- .LP
- 4.1
- \fIIntroduction\fR
- .EF '% Volume\ V\ \(em\ Suppl.\ No.\ 3''
- .OF '''Volume\ V\ \(em\ Suppl.\ No.\ 3 %'
- .sp 9p
- .RT
- .PP
- NTT has been studying an objective model for evaluating telephone transmission
- performance [39], [40], [41], [42]. This describes OPINE (Overall Performance
- Index model for Network Evaluation), focussing on practical use.
- .PP
- OPINE deals with transmission loss, circuit noise, room noise,
- attenuation/frequency distortion (fundamental factors), quantizing distortion,
- talker echo and sidetone. It models the auditory\(hypsychological process
- of
- evaluation by human beings of telephone transmission performance based
- on these factors. It is therefore the second type of model according to
- the
- classification of \(sc\ 2 (British Telecom). The model's basic principle is the
- fact that evaluation of psychological factors (not physical factors) on the
- psychological scale is additive. The model is extended from the first revision
- to take additional physical factors into account.
- .PP
- OPINE was first constructed for fundamental factors in 1983\ [39]. The
- opinion test data used for coefficient training and verification largely
- depend on the results of the experiment conducted at NTT ECL, Musashino
- in 1975. Its main purpose was to study the opinion score as a speech quality
- measure and a basis of telephone transmission standard. [40] and [43] describe
- the raw data. The experiment was of large scale with various factors taken
- into account,
- using an NTT 600\(hytype telephone set.
- .PP
- In 1985, opinion tests were conducted for quantizing distortion. A
- newer revision of the model that also dealt with quantizing distortion was
- formulated and verified\ [41].
- .PP
- Some further opinion tests for talker echo and sidetone were conducted
- in parallel\ [44], [45]. A study of the evaluation characteristics of talker
- echo and its interaction with loudness was undertaken later.
- .PP
- In 1986 revision 2.0 of OPINE was formulated\ [43] in which all the
- parameters were rewritten in terms of loudness rating (LR). This revision
- was improved and updated to\ 2.1. Improved points in revision\ 2.1 are
- these minor
- changes:
- .RT
- .LP
- \(em
- \(*D\fIf\fR has been corrected to agree with that of
- Recommendation\ P.79,
- .LP
- \(em
- a trivial bug of the Fortran program in revision\ 2.0 has been eliminated.
- .bp
- .PP
- While the model configuration was studied, the psychological
- characteristics of opinion evaluation were also investigated\ [46], using
- transmission loss and circuit noise as variables. The main conclusions
- were:
- .LP
- \(em
- the opinion score has good reproducibility if experimental
- design, subject type and other conditions are kept constant,
- .LP
- \(em
- the test condition range greatly affects the opinion score. The loss
- condition range especially affects the absolute opinion score.
- .PP
- In spite of the above conclusions, an absolute evaluation for a
- given network condition needs to be defined for practical use.
- .PP
- Therefore, we specify two classes of opinion tests:
- .RT
- .LP
- \(em
- Class 1, in which the score reflects the mean value of
- network evaluation for general telephone customers;
- .LP
- \(em
- Class 2, which produces a relative score but is sensitive to a few given
- physical factors.
- .PP
- In the class 1 test, the purpose is to obtain an absolute opinion score.
- Therefore the range of test conditions should be similar to that for
- degradation in the present commercial network. The more factors taken into
- account in the opinion test, the closer the score comes to an absolute
- value. The number of subjects should exceed\ 60. The class\ 2 test, on
- the other hand, is used to study interaction among several factors. It
- is more practical but
- the score obtained is not absolute. For this test, it is desirable that the
- subject's occupation be connected with the subject of speech quality.
- .PP
- In formulating OPINE, we classified the opinion database in 1975 as
- the first class, and the rest as the second.
- .PP
- Opinion data executed after 1983 were mainly used for qualitative
- verification of the additive characteristics of evaluation on a psychological
- scale for different factors.
- .PP
- In extensions of OPINE, coefficients for newer factors were changed so
- that they fitted the results of the absolute score of the class\ 1 test
- of
- 1975.
- .RT
- .sp 1P
- .LP
- 4.2
- \fIOutline of the model\fR
- .sp 9p
- .RT
- .PP
- Five psychological factors affecting telephone speech quality were chosen
- on the basis of previous studies:
- .RT
- .LP
- 1)
- speech distortion for attenuation/frequency distortion,
- .LP
- 2)
- effective loudness loss or excess in speech,
- .LP
- 3)
- noisiness during speech intervals and non\(hyspeech intervals,
- .LP
- 4)
- degradation caused by talker echo,
- .LP
- 5)
- degradation caused by sidetone.
- .PP
- A PI (Performance Index) is also introduced for each of the
- above factors which indicates the psychological degradation degree. The
- MOS is estimated from the Overall Performance Index (OPI) which is obtained
- by
- summing up all PIs.
- .PP
- To calculate the PI for each factor, physical factors are obtained for
- loudness, distortion,\ etc., and each PI is transformed by an appropriate
- function. These functions are determined heuristically and the necessary
- constants are estimated from subjective data. The degree to which each factor
- .PP
- influences the evaluation is reflected by these constants. The conceptual
- block diagram of OPINE is shown in Figure\ 4\(hy1. The model consists of
- four parts:\ 1) an overall electro\(hyacoustic calculation,\ 2) hearing
- parameter derivation,\ 3) a performance index derivation and\ 4) an evaluation
- derivation. The numbers in
- the figure refer to the equation numbers listed in \(sc\ 4.3.
- .RT
- .sp 1P
- .LP
- 4.3
- \fIConfiguration of OPINE\fR
- .sp 9p
- .RT
- .PP
- All the symbols are classified into 5 types:
- .RT
- .LP
- Type\ [A]:
- model parameters
- .LP
- Type\ [A\(hy1]:
- constants or coefficients adopted from standards
- .LP
- Type\ [A\(hy2]:
- constants or coefficients that OPINE accepted from results of other studies
- .LP
- Type\ [A\(hy3]:
- estimated coefficients from the results of NTT's subjective tests
- .LP
- Type\ [B]:
- input variables of the section being described
- .LP
- Type\ [C]:
- OPINE's intermediate outputs of the section being
- described.
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure 4\(hy1, p.1\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .PP
- Input variables to the model and the values of model parameters
- are listed in \(sc\ 4.4. In the following equations, \fIC\fR\d\fIj\fR\u(
- \fIj\fR =1,13)
- denote
- constants ([A\(hy3]\(hytype). The suffix \fIi\fR denotes the 1/3 octave
- frequency band
- number. Relations among variables corresponding to each section are shown in
- Figures\ 4\(hy3 through\ 4\(hy10. The definition of the graphic symbols
- used in these figures is shown in Figure\ 4\(hy2.
- .sp 1P
- .LP
- 4.3.1
- \fIOverall electro\(hyacoustic calculation\fR
- .sp 9p
- .RT
- .sp 1P
- .LP
- 4.3.1.1
- \fIOpinion equivalent white noise level of quantizing distortion\fR
- .sp 9p
- .RT
- .PP
- The model expresses CODEC's subective evaluation as an opinion
- equivalent speech\(hyto\(hyspeech correlated noise (\fIQ\fR\d\fIo\fR\\d\fIp\fR\u).
- Then the equivalent white noise level is acquired using the subjective
- opinion test results for
- MNR. If \fIA\fR\d\fIo\fR\\d\fIp\fR\uof a certain CODEC or its tandem connection
- is known, it is possible to use the value as input. The various CODECs
- and \fIQ\fR\d\fIo\fR\\d\fIp\fR\uadopted here are listed in Table\ 4\(hy1.
- \v'6p'
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ce
- \fBH.T. [T11.3]\fR
- .ce
- TABLE\ 4\(hy1
- .ce
- \fBValues of Q\fR\(da\fBo\fR\(da\fBp for PCM and ADPCM\fR\(da\fBv\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(72p) | cw(48p) .
- Transmission system \fIQ\fI
- _
- .T&
- lw(72p) | cw(48p) .
- PCM \(*m\(hy255, 8 bit 36.0
- .T&
- lw(72p) | cw(48p) .
- \fBMIC \(*m\(hy255,\fR 7 32.8
- .T&
- lw(72p) | cw(48p) .
- \fBMIC \(*m\(hy255,\fR 6 27.7
- .T&
- lw(72p) | cw(48p) .
- \fBMIC \(*m\(hy255,\fR 5 22.5
- .T&
- lw(72p) | cw(48p) .
- \fBMIC \(*m\(hy255,\fR 4 16.7
- .T&
- lw(72p) | cw(48p) .
- ADPCM v 29.2
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTable 4\(hy1 [T11.3], p.\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- where
- .LP
- (+)
- is the power summation operation
- .sp 1P
- .LP
- Type [B] symbols
- .sp 9p
- .RT
- .LP
- \fIQ\fR\d\fIo\fR\\d\fIp\fR\u is the opinion equivalent speech\(hyto\(hyspeech
- correlated noise ration\ (dB)
- .LP
- \fIV\fR\d\fIC\fR\u is the circuit noise level at the input to the
- receiving local telephone circuit\ (dBmp)
- .LP
- \fIOLR\fR is the overall loudness rating of the telephone system being
- considered\ (dB)
- .LP
- \fIRLR\fR is the receive loudness rating of the telephone system being
- considered\ \ (dB)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIV\fR\d\fIW\fR\\d\fIo\fR\\d\fIp\fR\u is the opinion (PI) equivalent
- white noise
- level at the input to the receiving local telephone circuit.\ \ (dBmp)
- .LP
- \fIPI\fI\d\fIQ\fR\u is the PI for quantizing distortion.
- .LP
- \fIV\fR\d\fIC\fR\\d\fIQ\fR\u is the equivalent circuit noise level when both
- circuit noise and quantizing distortion are present.\ \ (dBmp)
- .PP
- \fINote\fR \ \(em\ When the digital system is not considered in a test
- condition, equations (4\(hy1) and (4\(hy2) are not necessary, and \fIV\fR\d\fIW\fR\\d\fIo\fR\\d\fIp\fR\uis
- set to an arbitrary low level, such as \(em100, in equation\ (4\(hy3).
- .bp
- .sp 1P
- .LP
- 4.3.1.2
- \fISpeech level and total noise level at an ERP\fR (see also
- Annex\ C)
- \v'6p'
- .sp 9p
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- Where:
- .LP
- (+)
- power summation operation
- .sp 1P
- .LP
- Type [A\(hy1] Symbols
- .sp 9p
- .RT
- .LP
- \fIB\fR\d\fIS\fR\\d\fIi\fR\u is the spectrum density of speech referred
- to an MRP\ \ (dB rel 20 \(*mPa/Hz)
- .LP
- \(*D\fIf\fR\fI\d\fIi\fR\u is the width of ISO preferred 1/3 octave frequency
- band\ \ (Hz)
- .sp 1P
- .LP
- Type [A\(hy2] Symbols
- .sp 9p
- .RT
- .LP
- \fIB\fR\d\fIP\fR\\d\fIi\fR\u is the peak spectrum level of speech referred
- to an MRP\ \ (dB rel 20 \(*mpa/Hz)
- .LP
- \fIX\fR\d\fIi\fR\u is the hearing threshold for the continuous sound
- referred to an ERP\ \ (dB rel 20 \(*mPa/Hz)
- .LP
- \fIB\fR\d0\u\fI\fI\d\fIi\fR\u is the pure tone audibility threshold\
- \ (dB rel 20 \(*mPa/Hz)
- .LP
- \fIK\fR\d\fIi\fR\u is the critical bandwidth\ \ (dB)
- .LP
- \fIL\fR\d\fIR\fR\\d\fIN\fR\\d\fIE\fR\\d\fIi\fR\u is the leakage transmission
- loss at a
- listener's ERP\ \ (dB)
- .sp 1P
- .LP
- Type [B] symbols
- .sp 9p
- .RT
- .LP
- \fIL\fR\d\fIM\fR\\d\fIE\fR\\d\fIi\fR\u is the overall mouth\(hyto\(hyear
- loss\ \ (dB)
- .LP
- \fIS\fR\d\fIJ\fR\\d\fIE\fR\\d\fIi\fR\u is the receiving sensitivity of a local
- telephone circuit from the electrical input to an
- ERP\ \ (dB rel Pa/V)
- .LP
- \fIB\fR\d\fIR\fR\\d\fIN\fR\\d\fIi\fR\u is the room noise spectrum density\
- \ (dB rel 20 \(*mPa/Hz).
- .LP
- A\(hyweighted evaluation of \fIB\fR\d\fIR\fR\\d\fIN\fR\\d\fIi\fR\ubecomes
- \fIR\fR\d\fIN\fR\u\ \ (dBA)
- .LP
- \fIL\fR\d\fIR\fR\\d\fIN\fR\\d\fIS\fR\\d\fIT\fR\\d\fIi\fR\u is the sidetone
- transmission loss from an MRP to an ERP\ \ (dB)
- .LP
- \fIV\fR\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\u is the equivalent circuit noise
- level when
- both circuit noise and quantizing distortion are present\ \ (dBV/Hz)
- .LP
- Psophometric weighted evaluation of
- \fIV\fR\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\ubecomes \fIV\fR\d\fIC\fR\\d\fIQ\fR\u
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIS\fR\d\fIi\fR\u is the band spectrum level of speech at an ERP\ \ (dB
- rel 20 \(*mPa/Hz)
- .LP
- \fIS\fR\d\fIP\fR\\d\fIi\fR\u is the peak spectrum level of speech referred
- to an ERP\ \ (dB rel 20 \(*mPa/Hz)
- .LP
- \fIN\fR\d\fIi\fR\u is the total band noise level at an ERP\ \ (dB rel 20
- \(*mPa)
- .bp
- .LP
- \fIN\fR\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\u is the noise level caused by stationary
- circuit noise and quantizing distortion at an ERP
- (dB rel 20 \(*mPa/Hz)
- .LP
- \fIN`\fI\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\u is the band level of \fIN\fR\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\u\
- \ (dB rel 20 \(*mPa)
- .LP
- \fIN\fR\d\fIR\fR\\d\fIN\fR\\d\fIS\fR\\d\fIT\fR\\d\fIi\fR\u is the noise
- sidetone level caused by room noise at an ERP\ \ (dB rel 20 \(*mPa/Hz)
- .LP
- \fIN\fR\d\fIR\fR\\d\fIN\fR\\d\fIE\fR\\d\fIi\fR\u is the room roise level
- via earcap
- leakage\ \ (dB rel 20 \(*mPa/Hz).
- .sp 1P
- .LP
- 4.3.2
- \fIDerivation of hearing parameters and performance index (PI)\fR
- .sp 9p
- .RT
- .sp 1P
- .LP
- 4.3.2.1
- \fIPI\fI\d\fIE\fR\u\v'6p'
- .sp 9p
- .RT
- .EF '% \fIL\fI\ (PI\ for\ effective\ loudness\ loss\ or\ excess)''
- .OF '''\fIL\fI\ (PI\ for\ effective\ loudness\ loss\ or\ excess) %'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .LP
- max
- is a suffix which denotes maximum value within the passing bands
- .sp 1P
- .LP
- Type [A\(hy1] symbols
- .sp 9p
- .RT
- .LP
- \fIG\fR\d\fIi\fR\u is the ratio of loudness for frequency band \fIi\fR
- in a lossless system to total loudness (loudness function)
- .LP
- \(*D\fIf\fR\fI\d\fIi\fR\u is the width of the \fIi\fR th frequency band\ \ (Hz)
- .LP
- \fIm\fR is the ear's exponential coefficient (= 0.175)
- .LP
- \fIM\fR is the number of partitioned bands (= 19)
- .sp 1P
- .LP
- Type [A\(hy3] symbols
- .sp 9p
- .RT
- .LP
- \(*l\d0\u is the optimum loudness at ERP
- .LP
- \fIC\fR is a constant. Value of \fIC\fR is not needed since \fIC\fR is
- cancelled in equation (4\(hy15)
- .sp 1P
- .LP
- Type [B] symbols
- .sp 9p
- .RT
- .LP
- \fIL\fR\d\fIM\fR\\d\fIE\fR\\d\fIi\fR\u is the transmission loss\(hyfrequency
- characteristic from MRP to ERP\ \ (dB)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIPI\fI\d\fIE\fR\\d\fIL\fR\u PI on loundess in both the absence and
- presence of noise
- .LP
- \(*l\fI\fI\d\fIE\fR\u is the effective loudness at ERP taking the effect
- of noise into account
- .LP
- \fIb\fR\d\fIn\fR\u is the equivalent loudness loss in the presence of
- noise\ \ (dB)
- .LP
- \fIe\fR\d\fIn\fR\u is the maximum sensation peak level of speech\ \ (dB).
- .bp
- .sp 1P
- .LP
- 4.3.2.2
- \fIExpression of PI\fI\d\fIE\fR\u
- .sp 9p
- .RT
- .EF '% \fIL\ in\ terms\ of\ loudness\ rating\ (LR)''
- .OF '''\fIL\ in\ terms\ of\ loudness\ rating\ (LR) %'
- .PP
- Equation (4\(hy15) is theoretically expressed in terms of LR. The
- derivation of equation (4\(hy16) from equation (4\(hy15) is shown in
- Annex\ E.
- \v'6p'
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [A\(hy3] symbol
- .sp 9p
- .RT
- .LP
- \fIOLR\fR\d0\u is the overall loudness rating value at which the
- telephone system supplies the optimum loudness\ \ (dB)
- .sp 1P
- .LP
- Type [B] symbol
- .sp 9p
- .RT
- .LP
- \fIOLR\fR overall loudness rating of the telephone system being
- considered\ \ (dB).
- .sp 1P
- .LP
- 4.3.2.3
- \fIPI\fI
- \v'6p'
- .sp 9p
- .RT
- .EF '% \fIN\ (PI\ for\ noisiness)''
- .OF '''\fIN\ (PI\ for\ noisiness) %'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [A\(hy1] symbol
- .sp 9p
- .RT
- .LP
- \fIA\fR\d\fIi\fR\u is the weight for A\(hycharacteristic at frequency
- band \fIi\fR \ \ (dB)
- .sp 1P
- .LP
- Type [A\(hy3] symbols
- .sp 9p
- .RT
- .LP
- \fIN\fR\d\fIt\fR\\d\fIh\fR\u is the noise threshold\ \ (dB rel 20 \(*mPa)
- .LP
- \fIn\fR is the exponent
- .sp 1P
- .LP
- Type [B] symbol
- .sp 9p
- .RT
- .LP
- \fIN`\fI\fI\d\fIC\fR\\d\fIQ\fR\\d\fIi\fR\u (see \(sc\ 4.3.1.2)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIPI\fI\d\fII\fR\\d\fIN\fR\u is the PI for idle circuit (non\(hyspeech
- interval) noisiness.
- .LP
- \fIN\fR `
- \fI\fI\d\fIi\fR\u is the level above the noise
- threshold\ \ (dB).
- \v'6p'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .sp 1P
- .LP
- Type [A\(hy3] symbol
- .sp 9p
- .RT
- .LP
- \fISNR\fI\d\fIt\fR\\d\fIh\fR\u is the threshold below which the signal\(hyto\(hynoise
- ratio has no effect on the evaluation\ \ (dB)
- .bp
- .sp 1P
- .LP
- Type [B] symbols
- .sp 9p
- .RT
- .LP
- \fIS\fR\d\fIi\fR\u (see \(sc\ 4.3.1.2)
- .LP
- \fIN\fR\d\fIi\fR\u (see \(sc\ 4.3.1.2)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIPI\fI\d\fIS\fR\\d\fIN\fR\u is the \fIPI\fR for speech interval noisiness.
- .LP
- \fISNR\fR is the Signal\(hyto\(hynoise ratio at an ERP\ \ (dB).
- .sp 1P
- .LP
- 4.3.2.4
- \fIPI\fI\d\fIA\fR\u\v'6p'
- .sp 9p
- .RT
- .EF '% \fID\ (PI\ for\ attenuation/frequency\ distortion)''
- .OF '''\fID\ (PI\ for\ attenuation/frequency\ distortion) %'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .LP
- \fIg\fR\d\fIi\fR\u is the conversion function from the speech power
- spectrum into a loudness level by equal\(hyloudness curve (from\ [48])
- .LP
- \fIx\fR\d\fIi\fR\u is the arbitrary band speech level\ \ (dB rel 20 \(*mPa)
- .sp 1P
- .LP
- Type [A\(hy1] symbols
- .sp 9p
- .RT
- .LP
- \fIM\fR is the number of partitioned bands (= 19)
- .LP
- \fIa\fR\d\fIi\fR\u are the parameters for converting to
- loudness level (in phones); they are a function of frequency
- .EF '% \fIi''
- .OF '''\fIi %'
- .EF '% \fIi''
- .OF '''\fIi %'
- .sp 1P
- .LP
- Type [A\(hy2] symbol
- .sp 9p
- .RT
- .LP
- \fIM\fR\d\fIs\fR\u is the band number in which 1\ kHz is contained (= 11)
- .sp 1P
- .LP
- Type [A3] symbol
- .sp 9p
- .RT
- .LP
- \fIL\fR\d\fIt\fR\\d\fIh\fR\u is the loudness threshold\ \ (phon)
- .LP
- \(*L\fI\fI\d\fIt\fR\\d\fIh\fR\u is the threshold of \(*L\fIi\fR \ \ (phon)
- .bp
- .sp 1P
- .LP
- Type [B] symbol
- .sp 9p
- .RT
- .LP
- \fId\fR\d\fIi\fR\u is the relative loss caused by attenuation/frequency
- distortion between junctions\ \ (dB)
- .LP
- It is 0\ dB at 800\ Hz. \fIS\fR \ +\ \fId\fR represents hypothetical band
- speech level at an ERP without attenuation/frequency distortion (reference
- speech)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \(*L\fI\fI\d\fIi\fR\u is the difference between reference speech and
- distorted speech\ \ (phon)
- .LP
- \(*L\fI\fI\d\fIl\fR\u is the loudness level converted from reference
- speech\ \ (phon)
- .LP
- \(*L\fI\fI\d\fId\fR\u is the loudnes level converted from speech with
- both loss and band limitation\ \ (phon)
- .LP
- \fID\fR\d\fIu\fR\u is the distance between \(*L\fI\fI\d\fIl\fR\uand \(*L\fI\fI\d\fId\fR\uabove
- 1\ kHz
- .LP
- \fID\fR\d\fIl\fR\u is the distance between \(*L\fI\fI\d\fIl\fR\uand \(*L\fI\fI\d\fId\fR\ubelow
- 1\ kHz
- .LP
- \fIPI\fI\d\fIA\fR\\d\fID\fR\u is the PI for attenuation/frequency distortion.
- .sp 1P
- .LP
- 4.3.2.5
- \fIPI\fI\d\fIE\fR\u\v'6p'
- .sp 9p
- .RT
- .EF '% \fIC\ (PI\ for\ talker\ echo)''
- .OF '''\fIC\ (PI\ for\ talker\ echo) %'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [B] symbols
- .sp 9p
- .RT
- .LP
- \fIE\fR is the talker echo LR\ \ (dB)
- .LP
- \fID\fR is the delay time of talker echo\ \ (msec)
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIPI\fI\d\fIE\fR\\d\fIC\fR\u is the performance index on talker echo
- .LP
- \fIE\fR\d0\u is the critical talker echo LR\ \ (dB).
- .sp 1P
- .LP
- 4.3.2.6
- \fIPI\fI\d\fIS\fR\u\v'6p'
- .sp 9p
- .RT
- .EF '% \fIT\ (PI\ for\ sidetone)''
- .OF '''\fIT\ (PI\ for\ sidetone) %'
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [A\(hy3] symbol
- .sp 9p
- .RT
- .LP
- \fISt\fR\d0\u is the critical STMR\ \ (dB)
- .sp 1P
- .LP
- Type [B] symbol
- .sp 9p
- .RT
- .LP
- \fISt\fR is the STMR (sidetone masking rating)\ \ (dB)
- .sp 1P
- .LP
- Type [C] symbol
- .sp 9p
- .RT
- .LP
- \fIPI\fI\d\fIS\fR\\d\fIT\fR\u is the performance index on sidetone.
- .bp
- .sp 1P
- .LP
- 4.3.3
- \fIEvaluation derivation\fR (see also Annex D)
- \v'6p'
- .sp 9p
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [A\(hy3] symbol
- .sp 9p
- .RT
- .LP
- \fIP\fR\d0\u is \fIP\fR with no degradation.
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIOPI\fR is the overall performance index
- .LP
- \fIP\fR is the mean overall evaluation on this psychological
- scale
- \v'6p'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- where:
- .sp 1P
- .LP
- Type [A\(hy3] symbol
- .sp 9p
- .RT
- .LP
- \(*s
- is the standard deviation of normal distribution of \fIP\fR and \fIOPI\fR
- .sp 1P
- .LP
- Type [C] symbols
- .sp 9p
- .RT
- .LP
- \fIMOS\fR is the mean opinion score ranging from 0 to 4
- .LP
- \fIp\fR\d\fIk\fR\u is the ratio of evaluation category \fIk\fR to all the
- categories.
- .PP
- Equation (4\(hy35) is calculated using the standard normal
- distribution table. The derivation of this equation from equation (4\(hy34) is
- shown in Annex\ F.
- .PP
- Equations (4\(hy34) and (4\(hy35) are the adaptation of the model
- in\ [49].
- .RT
- .sp 1P
- .LP
- 4.4
- \fISymbol types and values\fR
- .sp 9p
- .RT
- .PP
- Input variables to the model are listed in Table\ 4\(hy2. \fIL\fR\d\fIM\fR\\d\fIE\fR\uand
- \fISTMR\fR can be calculated in advance using the method described in
- Recommendation\ P.79.
- .PP
- Values of \fIa\fR\d\fIi\fR\u,\fIb\fR\d\fIi\fR\uand \fIc\fR\d\fIi\fR\u([A\(hy1]\(hytype)
- are shown in
- Table\ 4\(hy3. Values of other model parameters ([A\(hy1]\(hy and [A\(hy2]\(hytype
- parameters) are shown in Table\ 4\(hy4. Values of estimated constants or
- coefficients from the subjective test results ([A\(hy3]\(hytype parameters)
- are shown in Table\ 4\(hy5.
- .bp
- .RT
- .ce
- \fBH.T. [T12.3]\fR
- .ce
- TABLE\ 4\(hy2
- .ce
- \fBInput variables to the model\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(60p) | cw(120p) .
- Symbols Definition
- _
- .T&
- lw(60p) | lw(120p) .
- \fIV\fI See \(sc 4.3.1.1
- .T&
- lw(60p) | lw(120p) .
- \fIQ\fI See \(sc 4.3.1.1
- .T&
- lw(60p) | lw(120p) .
- \fIOLR\fR {
- See \(sc\(sc 4.3.1.1, 4.3.2.2
- }
- .T&
- lw(60p) | lw(120p) .
- \fIRLR\fR See \(sc 4.3.1.1
- .T&
- lw(60p) | lw(120p) .
- \fIS \dMJi \u\fR {
- Mouth to junction loss (dB rel V/Pa)
- }
- .T&
- lw(60p) | lw(120p) .
- \fIS \dJEi \u\fR See \(sc 4.3.1.2
- .T&
- lw(60p) | lw(120p) .
- \fIL\fR {
- Junction to junction loss at 800 Hz (dB)
- }
- .T&
- lw(60p) | lw(120p) .
- \fId\fI See \(sc 4.3.2.4
- .T&
- lw(60p) | lw(120p) .
- \fIL \dMEi \u\fR See \(sc 4.3.1.2
- .T&
- lw(60p) | lw(120p) .
- \fIR\fI See \(sc 4.3.1.2
- .T&
- lw(60p) | lw(120p) .
- \fIL \dRNSTi \u\fR See \(sc 4.3.1.2
- .T&
- lw(60p) | lw(120p) .
- \fIE\fR See \(sc 4.3.2.5
- .T&
- lw(60p) | lw(120p) .
- \fID\fR See \(sc 4.3.2.5
- .T&
- lw(60p) | lw(120p) .
- \fIL \dMESTi \u\fR {
- Mouth to ear sidetone loss (dB)
- }
- .T&
- lw(60p) | lw(120p) .
- \fISt\fR See \(sc 4.3.2.6
- .TE
- .LP
- \fINote\ 1\fR
- \ \ \fIL
- \dMEi \u\fR = \(em\fIS \dMJi \u\fR
- \(em \fIS \dJEi \u\fR + (\fIL\fR + \fId\fI).
- .LP
- \fINote\ 2\fR
- \ \ \fISt\fR
- | is calculated according to Recommendation P.79, \(sc 8.
- .LP
- \fINote\ 3\fR
- \ \ \fIS
- \dMJi
- \u\fR
- , \fIL\fR
- | and \fIL
- \dMEST
- \u\fR
- | only necessary to calculate \fIL
- \dMEi
- \u\fR
- | and \fISt\fR .
- .LP
- \fINote\ 4\fR
- \ \ \fIR\fI
- | should be expanded \fIB
- \dRNi
- \u\fR .
- .nr PS 9
- .RT
- .ad r
- \fBTableau 4\(hy2 [T12.3], p.3\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .sp 4
- .rs
- .sp 22P
- .ad r
- \fBFIGURES 4\(hy2 ET 4\(hy3, p.4\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFIGURE 4\(hy4, p.5\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFIGURE 4\(hy5, p.6\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFIGURE 4\(hy6, p.7\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFIGURES 4\(hy7 ET 4\(hy8 A L'ITALIENNE COTE A COTE, p.10\(hy11\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFIGURES 4\(hy9 ET 4\(hy10 A L'ITALIENNE COTE A COTE, p.10\(hy11\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce
- \fBH.T. [T13.3]\fR
- .ce
- TABLEAU\ 4\(hy3
- .ce
- \fBValues of a\fR\(da\fBi, b\fR\(da\fBi and c\fR\(da\fBi\fR
- .ce
- (interpolated from [48])
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- No. Frequency (Hz) \fIa\fI \fIb\fI \fIc\fI
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 1 \ 100 \(em33.5 1.570 \(em0.00269
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 2 \ 125 \(em25.7 1.500 \(em0.00258
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 3 \ 160 \(em19.4 1.444 \(em0.00248
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 4 \ 200 \(em14.7 1.404 \(em0.00242
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 5 \ 250 \(em10.8 1.362 \(em0.00231
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 6 \ 315 \ \(em7.4 1.314 \(em0.00214
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 7 \ 400 \ \(em4.7 1.259 \(em0.00185
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 8 \ 500 \ \(em3.0 1.205 \(em0.00151
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- \ 9 \ 630 \ \(em1.5 1.141 \(em0.00107
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 10 \ 800 \ \(em0.5 1.064 \(em0.00050
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 11 1000 \ \ 0.0 1.000 \ 0.00000
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 12 1250 \ \ 0.6 0.967 \ 0.00028
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 13 1600 \ \ 1.7 0.037 \ 0.00071
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 14 2000 \ \ 3.3 0.924 \ 0.00100
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 15 2500 \ \ 5.3 0.928 \ 0.00118
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 16 3150 \ \ 7.3 0.940 \ 0.00119
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 17 4000 \ \ 7.9 0.954 \ 0.00098
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 18 5000 \ \ 5.3 0.973 \ 0.00059
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 19 6300 \ \(em2.6 1.028 \ 0.00013
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau 4\(hy3 [T13.3], p.12\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .sp 24
- .bp
- .ce
- \fBH.T. [T14.3]\fR
- .ce
- TABLE\ 4\(hy4
- .ce
- \fBModel parameters\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- lw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- No. Frequency \(*D\fI\fI \fIB\fI \fIB\fI \fIX\fI \fIL \dRNE \u\fR 10 log 1 0 \fIG\fI \fIA\fI
- _
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- Parameter type [A\(hy1] [A\(hy2] [A\(hy2] [A\(hy2] [A\(hy1] [A\(hy1]
- _
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- Source Rec. P.51 \fIB\fI + 12 NTT 1968 NTT 1968 Rec. P.79 ISO
- _
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- (Hz) (Hz) (dB) 20\ \(*mPa/Hz (dB) 20\ \(*mPa/Hz (dB) 20\ \(*mPa/Hz (dB) (dB) (dB)
- _
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 1 \ 100 \ \ 22.4 57.2 69.2 \ 11.0 \ 0.0 \(em32.63 \(em19.1
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 2 \ 125 \ \ 29.6 60.0 72.0 \ \ 8.9 \ 0.0 \(em29.12 \(em16.1
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 3 \ 160 \ \ 37.5 62.1 74.1 \ \ 5.5 \ 0.0 \(em27.64 \(em13.4
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 4 \ 200 \ \ 44.7 62.9 74.9 \ \ 2.2 \ 0.0 \(em28.46 \(em10.9
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 5 \ 250 \ \ 57.0 63.0 75.0 \ \ 0.0 \ 0.0 \(em28.58 \ \(em8.6
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 6 \ 315 \ \ 74.3 62.4 74.4 \ \(em3.0 \ 0.7 \(em31.10 \ \(em6.6
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 7 \ 400 \ \ 92.2 61.0 73.0 \ \(em6.0 \ 0.0 \(em29.78 \ \(em4.8
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 8 \ 500 \ 114.0 59.3 71.3 \ \(em8.0 \ 0.0 \(em32.68 \ \(em3.2
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- \ 9 \ 630 \ 149.0 57.0 69.0 \ \(em9.5 \ 2.2 \(em33.21 \ \(em1.9
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 10 \ 800 \ 184.0 54.2 66.2 \(em10.3 \ 8.5 \(em34.14 \ \(em0.8
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 11 1000 \ 224.0 51.4 63.4 \(em11.0 13.5 \(em35.33 \ \ 0.0
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 12 1250 \ 296.0 48.5 60.5 \(em11.8 15.5 \(em37.90 \ \ 0.6
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 13 1600 \ 375.0 45.2 57.2 \(em13.0 20.0 \(em38.41 \ \ 1.0
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 14 2000 \ 447.0 42.2 54.2 \(em16.0 23.7 \(em41.25 \ \ 1.2
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 15 2500 \ 570.0 39.4 51.4 \(em19.8 30.0 \(em41.71 \ \ 1.3
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 16 3150 \ 743.0 36.8 48.8 \(em23.0 27.0 \(em45.80 \ \ 1.2
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 17 4000 \ 922.0 34.5 46.5 \(em26.0 33.5 \(em43.50 \ \ 1.0
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 18 5000 1140.0 32.7 44.7 \(em27.0 41.0 \(em47.13 \ \ 0.5
- .T&
- cw(30p) | cw(12p) | cw(24p) | cw(18p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) | cw(24p) .
- 19 6300 1490.0 31.4 43.4 \(em24.0 50.0 \(em48.27 \ \(em0.1
- .TE
- .LP
- \fINote\fR
- \ \ \fIX\fI
- (=\fIB\fR
- 0\fI\fI
- \(em \fIk\fI
- ) and \fIL
- \dRNE
- \u\fR
- | can be input
- parameters.
- .nr PS 9
- .RT
- .ad r
- \fBTableau 4\(hy4 [T14.3], p.13\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce
- \fBH.T. [T15.3]\fR
- .ce
- TABLE\ 4\(hy5
- .ce
- \fBValues of estimated constants and coefficients\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- No. Related section Output Symbol Value
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 1 4.3.2.1 4.3.2.2 PI E L {
- \fIC\fR
- 1
- \fIC\fR
- 2
- \(*l
- 0/\fIc\fR
- \fIOLR\fR
- 0
- } {
- \ \ 0.0475\
- \ \ 0.010\ \
- \ \ 0.780\ \
- \ \ 5.34\ \ \
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 2 4.3.2.3 PI I N {
- \fIN\fI
- \fIn\fR
- \fIC\fR
- 3
- } {
- \ 33.0\ \ \ \
- \ \ 0.50\ \ \
- \ \ 0.012\ \
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 3 4.3.2.3 PI S N \fISNR\fI \fIC\fR 4 {
- \ \ 7.5\ \ \ \
- \ \(em0.005\ \
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 4 4.3.2.4 PI A D {
- \fIL\fI
- \fIC\fR
- 5
- \fIC\fR
- 6
- \(*L\fI\fI
- } {
- \ 57.5\ \ \ \
- \ \ 0.043\ \
- \ \ 0.043\ \
- \ 15.0\ \ \ \
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 5 4.3.2.5 PI E C {
- \fIC\fR
- 7
- \fIC\fR
- 8
- \fIC\fR
- 9
- \fIC\fR
- 1
- 0
- \fIC\fR
- 1
- 1
- \fIC\fR
- 1
- 2
- } {
- \ 13.69\ \ \
- \ \ 0.01\ \ \
- \ 26.4\ \ \ \
- \ \ 2.65\ \ \
- \ 14.00\ \ \
- \ 24.6\ \ \ \
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 6 4.3.2.6 PI S T {
- \fIC\fR
- 1
- 3
- \fIST\fR
- 0
- } \ \ 0.00856 \ \ 9.000\ \
- _
- .T&
- cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
- 7 4.3.3\fB.6\fR MOS \fIP\fR 0 \(*s \ \ 3.558\ \ \ \ 0.730\ \
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau 4\(hy5 [T15.3], p.14\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .ce 1000
- ANNEX\ A
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 1.1)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBOpinion ratings of transmission impairments\fR
- .sp 1P
- .RT
- .ce 0
- .LP
- A.1
- \fIIntroduction\fR
- .sp 1P
- .RT
- .PP
- The figures in this annex illustrate the relative effect of typical transmission
- impairments on opinion ratings. They are based on the transmission rating
- models described above. The opinion ratings assume a
- five\(hycategory rating scale (excellent, good, fair, poor and bad or
- unsatisfactory) and the results are presented in terms of the percent of
- ratings which are good or better (good plus excellent) and poor or worse
- (poor plus bad). Three equations for the conversion from transmission rating
- to the
- .PP
- opinion ratings are described above in the text of the Supplement. The one
- which is used in this annex is representative of conversational test results
- reported to the CCITT by several Administrations during the Study Period
- 1973\(hy1976.
- .bp
- .RT
- .sp 1P
- .LP
- A.2
- \fIOverall loudness rating and circuit noise\fR
- .sp 9p
- .RT
- .PP
- Opinion ratings for the combined effects of OLR
- (\fIL\fR `
- \fI\fI\d\fIe\fR\uin dB) and circuit noise (\fIN\fR `
- \fI\fI\d\fIc\fR\uin
- dBmp) are shown in Figures\ A\(hy1 and\ A\(hy2. The circuit noise is referred
- to a
- receiving system with an RLR of 0\ dB. In these figures the circuit noise
- equivalent for room noise \fIN\fR `
- \fI\fI\d\fIR\fR\\d\fIe\fR\uis \(em58.63\ dBmp and the
- bandwidth/slope factor (\fIk\fR\d\fIB\fR\\d\fIW\fR\u) is\ 1; quantization
- noise, listener echo, talker echo and sidetone are not included.
- .RT
- .sp 1P
- .LP
- A.3
- \fIQuantization noise from PCM processes\fR
- .sp 9p
- .RT
- .PP
- Opinion results for the effect of quantization noise from tandem
- 7\ bit and 8\ bit \(*m\(hylaw and A\(hylaw PCM processes are shown in Figures\
- A\(hy3 and\ A\(hy4. These results assume an OLR (\fIL\fR `
- \fI\fI\d\fIe\fR\u) of 16\ dB and a
- circuit noise (\fIN\fR `
- \fI\fI\d\fIc\fR\u) of \(em56\ dBmp. Room noise,
- bandwidth/slope and sidetone assumptions are the same as for \(sc\ A.2.
- The speech level at the output of a telephone set with a 0\ dB SLR is assumed
- to be
- \(em10\ VU.
- .RT
- .LP
- .sp 1P
- .LP
- A.4
- \fIBandwidth\fR
- .sp 9p
- .RT
- .PP
- The effect on opinion rating as a function of bandwidth between
- frequencies having 10\ dB of loss relative to 1000\ Hz is shown in Figures\
- A\(hy5
- and\ A\(hy6. These results assume an OLR (\fIL\fR `
- \fI\fI\d\fIe\fR\u) of 16\ dB, a circuit noise (\fIN\fR `
- \fI\fI\d\fIc\fR\u) of \(em56\ dBmp, a circuit noise
- equivalent for room noise (\fIN\fR `
- \fI\fI\d\fIR\fR\\d\fIe\fR\u) of \(em58.63\ dBmp,
- and lower (\fIS\fR\d\fIl\fR\u) and upper (\fIS\fR\d\fIu\fR\u) slope factors
- of\ 2 and
- 3\ respectively. Listener echo, talker echo and sidetone effects are not
- included.
- .RT
- .sp 1P
- .LP
- A.5
- \fIListener echo\fR
- .sp 9p
- .RT
- .PP
- The effect of listener echo on opinion ratings is illustrated in
- Figures\ A\(hy7 and\ A\(hy8. In these figures the opinion is plotted (from
- both the
- original and alternate models of the supplement) as a function of the weighted
- listener echo path loss (\fIWEPL\fR ) in dB and round\(hytrip listener
- echo path delay (\fID\fR\d\fIL\fR\u) in milliseconds. The curves were calculated
- assuming an OLR (\fIL\fR `
- \fI\fI\d\fIe\fR\u) of 16\ dB, a circuit noise
- (\fIN\fR `
- \fI\fI\d\fIc\fR\u) of \(em56\ dBmp\fR , a circuit noise equivalent for
- room noise (\fIN\fR `
- \fI\d\fIR\fR\\d\fIe\fR\u) of \(em58.63\ dBmp, and a
- bandwidth/slope factor of\ 1. Talker echo and sidetone effects are not
- included.
- .RT
- .LP
- .sp 1P
- .LP
- A.6
- \fITalker echo\fR
- .sp 9p
- .RT
- .PP
- Opinion ratings for talker echo are presented in Figures A\(hy9
- and\ A\(hy10 as a function of the OLR of the talker echo path (\fIE\fR
- ) in dB and the round\(hytrip talker echo path delay (\fID\fR ) in milliseconds.
- Again, the OLR (\fIL\fR `
- \fI\fI\d\fIe\fR\u) was taken as 16\ dB, the circuit noise
- (\fIN\fR `
- \fI\fI\d\fIc\fR\u) as \(em56\ dBmp, the circuit noise equivalent of
- room noise (\fIN\fR `
- \fI\fI\d\fIR\fR\\d\fIe\fR\u) as \(em58.63\ dBmp and the
- bandwidth/slope factor as\ 1. Listener echo and sidetone effects are not
- included.
- .RT
- .sp 1P
- .LP
- A.7
- \fISidetone\fR
- .sp 9p
- .RT
- .PP
- Opinion ratings for sidetone are presented in Figures A\(hy11 and\ A\(hy12
- in terms of the sidetone path loss (\fISTMR\fR ) in\ dB and the sidetone
- response shape in\ dB/octave. For these curves, impairment levels were
- selected to provide a constant \fIR\fR \fI\d\fIL\fR\\d\fIN\fR\uvalue typical
- of toll calls in North
- America and a range of \fIR\fR\d\fIE\fR\uvalues which might be encountered
- on toll calls in North America.
- .bp
- .RT
- .LP
- .rs
- .sp 26P
- .ad r
- \fBFigure A\(hy1, p.15
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 21P
- .ad r
- \fBFigure A\(hy2, p.
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 28P
- .ad r
- \fBFigure A\(hy3, p.17
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 20P
- .ad r
- \fBFigure A\(hy4, p.18
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 27P
- .ad r
- \fBFigure A\(hy5, p.19\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- \fI\fR
- .LP
- .rs
- .sp 20P
- .ad r
- \fBFigure A\(hy6, p.20\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 27P
- .ad r
- \fBFigure A\(hy7, p.21\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 20P
- .ad r
- \fBFigure A\(hy8, p.22
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 27P
- .ad r
- \fBFigure A\(hy9, p.23
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 20P
- .ad r
- \fBFigure A\(hy10, p.24
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 28P
- .ad r
- \fBFigure A\(hy11, p.25\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 20P
- .ad r
- \fBFigure A\(hy12, p.26\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce 1000
- ANNEX\ B
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 2.9)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBCalculated transmission performance of telephone networks\fR
- .sp 1P
- .RT
- .ce 0
- .LP
- B.1
- \fIIntroduction\fR
- .sp 1P
- .RT
- .PP
- This annex is intended to give examples of results from the
- subjective model which is incorporated in the BT CATNAP (Computer\(hyAided
- Telephone Network Assessment Program) program. CATNAP comprises this model
- and a transmission calculation section which enables elements of a connection
- to be entered as readily identifiable items, e.g.\ lengths of cable, feed
- bridges etc. These results are examples of calculations for various \*Qhypothetical
- reference connections\*U (HRCs) which might arise in the network or would
- be of use to
- planners.
- .PP
- The loudness ratings quoted are calculated according to
- Recommendation\ P.79, using the frequency bands from 200\ Hz to 4\ kHz. The
- opinion scores, \fIY\fR\d\fIL\fR\\d\fIE\fR\uand \fIY\fR\d\fIC\fR\u, are
- on a scale of 0 to 4,
- representing the listening effort and conversation opinion scales
- (see\ Supplement\ No.\ 2). The values of line current shown with the results
- are determined by the program which decides from the characteristics of
- the local telephone system which of a number of standard line currents
- is appropriate,
- and hence which values of the telephone instrument characteristics should be
- used. The program also gives speech levels for controlled talking conditions
- (\fIV\fR\d\fIL\fR\u) and under conversational conditions (\fIV\fR\d\fIC\fR\u).
- These and the loudness ratings are referred to the interfaces (NI and FI)
- shown in the
- figures below.
- .PP
- These results are for the model as it stands at present
- (1983\ version). Research is continuing to improve the correlation of calculated
- and experimental results, so the model is liable to modification.
- .RT
- .sp 1P
- .LP
- B.2
- \fIHRC\ 1\ \(em\ Own exchange call\fR | see Figure B\(hy1)
- .sp 9p
- .RT
- .PP
- This is a symmetrical connection, with average length customers'
- lines. The sidetone suppression is fairly good, and room noise and circuit
- noise levels are low. The conversation opinion score is good, but the small
- overall loss means that the connection is louder than preferred. A slightly
- quieter connection would give a better opinion score.
- .RT
- .LP
- .sp 1P
- .LP
- B.3
- \fIHRC\ 2\ \(em\ Limiting national call\fR | see Figure B\(hy2)
- .sp 9p
- .RT
- .PP
- These two HRCs are both symmetrical and comprise BT limiting
- local lines of 1000\(*W/10\ dB, 4.5\ dB local junctions and two 4\(hywire
- junctions
- each with 3.5\ dB loss, which are the limits set by the BT transmission plan
- (given in\ [29]).
- .PP
- HRC 2 (a) uses 0.5 mm copper local lines, which provide much better
- sidetone matching than the 0.9\ mm copper lines of HRC 2 (b). The change in
- sidetone level (> | 0\ dB) causes a drop in the conversation opinion score
- from 1.9 to 0.8 (from fair to poor).
- .RT
- .sp 1P
- .LP
- B.4
- \fIHRC\ 3\ \(em\ Long distance call with a PCM junction\fR | see Figure
- B\(hy3)
- .sp 9p
- .RT
- .PP
- The overall loss of this connection (OLR = 13.4 dB) is much less
- than for HRC 2. The local lines are average length of 0.5\ mm copper which
- give reasonably good sidetone matching, and there is now only one local
- junction.
- This is a 4\(hywire 3\ dB PCM junction. This is entered as a single item,
- characterised by the terminating and balance impedances of the 2/4\(hywire
- terminating sets, the matched loss in each direction and the phase delay
- round the loop. Quantizing noise is negligible for the input speech levels
- calculated by CATNAP for this connection.
- .PP
- The connection is symmetrical in transmission loss but a small
- difference in the sidetone level has given slightly different conversation
- opinion scores at the two ends.
- .bp
- .RT
- .sp 1P
- .LP
- B.5
- \fIHRC\ 4\ \(em\ Asymmetry of transmission loss\fR | see Figure B\(hy4)
- .sp 9p
- .RT
- .PP
- A number of calculations have been done for this HRC to show the
- effect of varying the degree of asymmetry. The curves shown are not fitted
- curves, but simply join the marked points on the graph. They show the effect
- on the
- conversation opinion score
- and
- conversational speech
- voltage
- of varying the transmission loss in one direction only (from near end to
- far end). The loss from far to near is kept constant, so the opinion of
- the near end customer is much less affected. It is suspected that the speech
- voltage curves are too divergent and further research is needed in this
- area, but the opinion curves show similar trends to the results produced
- by
- Boeryd\ [30].
- .PP
- The sidetone level was virtually unaffected by the change in
- transmission loss.
- .RT
- .LP
- .sp 1P
- .LP
- B.6
- \fIHRC\ 5\ \(em\ Effect of room noise\fR | see Figure B\(hy5)
- .sp 9p
- .RT
- .PP
- The calculations done for this HRC demonstrate the effect of
- changing the level of room noise for a customer with a loud sidetone path
- (near end) and one with a quiet sidetone path (far end). As for HRC\ 4,
- the computed points are simply joined to form the line.
- .RT
- .sp 1P
- .LP
- B.7
- \fIHRC\ 6\ \(em\ Effect of circuit noise and bandlimiting\fR | see
- Figure B\(hy6)
- .sp 9p
- .RT
- .PP
- This is a connection using 4\(hywire reference telephones, enabling
- sidetone to be controlled. The STMR is kept at 20\ dB, at which level most
- customers would not detect it.
- .PP
- Such a connection can be used to investigate the effects of
- particular transmission impairments varied independently. Here it has been
- used to demonstrate the effect on the listening effort and conversation
- opinion
- scores of the level of injected circuit noise and band limiting (lowpass)
- over a range of losses likely to occur in telephone networks.
- .PP
- As for the previous curves the computed points are simply joined to
- form a line.
- .RT
- .LP
- .sp 1P
- .LP
- B.8
- \fIHRC\ 7\ \(em\ Multiple calculations with random selection of items\fR
- | see Figure\ B\(hy7)
- .sp 9p
- .RT
- .PP
- CATNAP is intended to help assess telephone network proposals
- rather than single connections. The program can perform multiple calculations
- on a group of connections or on a single connection with random selection
- of
- elements from a database.
- .PP
- Here random selection is made of the customers' lines out of a
- database derived from a survey of 1800\ existing lines. This enables the
- performance of a particular element to be tested for a range of conditions
- which would arise in the actual network. Since the survey reflects the
- distribution of lengths and gauges in the actual network, this method of
- assessment gives a more accurate picture of the performance in the existing
- network.
- .PP
- For this example only a few calculations have been done to
- demonstrate the facility and so the results have been printed. This is not
- practical for large numbers of calculations, when the results are stored and
- can be processed as desired, e.g.\ by plotting the distribution or by
- statistical analysis.
- .PP
- The line number and radial distance have been given for both ends of each
- calculation.
- .RT
- .sp 1P
- .LP
- B.9
- \fIHRC\ 8\ \(em\ Example of the use of CATNAP to meet a design criterion\fR
- | see Figure\ B\(hy8)
- .sp 9p
- .RT
- .PP
- This is intended to give an example of the use of CATNAP in the
- design of individual network components to meet design targets.
- .PP
- With the introduction of electronic telephones the designer has a
- freer choice of values for the telephone instrument characteristics,
- e.g.\ the value of the line impedance which must be connected to the telephone
- instrument to give full sidetone suppression (\fIZ\fR\d\fIs\fR\\d\fIo\fR\u).
- .PP
- An iterative procedure can lead to preferred values for
- \fIZ\fR\d\fIs\fR\\d\fIo\fR\u.
- As examples, calculations have been done for a standard BT\ 706 and a\ 706
- with some trial values for \fIZ\fR\d\fIs\fR\\d\fIo\fR\uon BT limiting lengths
- of local copper cable of standard gauges, and an average length of 0.5\
- mm cable. For one of the trial sets of values which looks possible from
- these results and for a standard 706 instrument, a set of 40 calculations
- was done
- .bp
- .PP
- with random
- selection of
- local lines from the database of 1800 used for HRC\ 7. These results are
- given in terms of the mean and standard deviation of the distribution of
- STMRs. From this it can be seen that the trial values do give a better
- performance on
- .PP
- average, although the performance is worse on 0.63\ mm and 0.9\ mm limiting
- lines, since these are less common in the local network than 0.5\ mm.
- .PP
- As a design tool, the program could be used further to verify the
- improvement in performance, to check the effects of tolerances and to consider
- possible improvements to these values.
- .RT
- .sp 1P
- .LP
- B.10
- \fIHRC\ 9\ \(em\ Effect of varying line length\fR | see Figure B\(hy9)
- .sp 9p
- .RT
- .PP
- This HRC is identical to HRC 2 except for the gauge of cable. In
- this case 0.63\ mm copper cable is used. Its length is varied from zero to
- 10\ km, which is beyond the BT limiting length (7.2\ km).
- .PP
- The results are shown as curves of conversation opinion score, OLR and
- conversational speech voltage against line length. As before, the computed
- points are simply joined to form a line.
- .PP
- The calculations on this HRC have been included to demonstrate the
- \*Qinverse\*U use of CATNAP. The limits on OLR are known (from the transmission
- plan) and so these runs could be used to show what range of cable lengths
- are acceptable. The facility for calculating the performance in terms of
- conversation opinion score makes it possible to specify performance limits
- in terms of this, which is closer to the real performance than limits set
- in terms of loudness ratings.
- .RT
- .LP
- .rs
- .sp 33P
- .ad r
- \fBFigure B\(hy1, p.27\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy2, p.28\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy3, p.29\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy4, p.30\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy5, p.31\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy6, p.32\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy7, p.33\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 18P
- .ad r
- \fBFigure B\(hy8, p.34\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .ce
- \fBH.T. [T16.3]\fR
- .ce
- TABLE\ B\(hy1
- .ce
- \fBValues of STMR (dB) for specified lines (copper conudctors)\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- lw(66p) | cw(30p) | cw(36p) | cw(30p) | cw(36p) | cw(30p) , ^ | ^ | c s s s.
- \fIZ\fI 1.6 km 0.5 mm (median) 6 km 0.5 mm 3.7 km 0.4 mm 7.2 km 0.63 mm 10 km 0.9 mm
- (limiting)
- _
- .T&
- lw(66p) | cw(30p) | cw(36p) | cw(30p) | cw(36p) | cw(30p) .
- 706 \ 9.9 \ 15.7 \ \ 7.2 \ 7.5 \ 0.0
- _
- .T&
- lw(66p) | cw(30p) | cw(36p) | cw(30p) | cw(36p) | cw(30p) .
- {
- Conjugate of input \fIZ\fR
- } \ 1.8 \ \ 1.1 \ \ 0.6 \(em0.2 \(em0.6
- _
- .T&
- lw(66p) | cw(30p) | cw(36p) | cw(30p) | cw(36p) | cw(30p) .
- 600 \(*W \ 6.6 \(em0.8 \ \(em1.2 \(em2.0 \(em3.0
- _
- .T&
- lw(66p) | cw(30p) | cw(36p) | cw(30p) | cw(36p) | cw(30p) .
- Suggested values 10.2 \ 13.4 \ 13.8 \ 4.4 \(em1.3
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau [B\(hy1] [T16.3], p35\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .ce
- \fBH.T. [T17.3]\fR
- .ce
- TABLE\ B\(hy2
- .ce
- \fBDistribution of STMR for a sample of 40 lines for a Standard 706\fR
- .ce
- \fBand the suggested values of\fR
- .ce
- \fIZ\fI
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- lw(66p) | cw(36p) | cw(42p) | cw(42p) | cw(42p) .
- \fIZ\fI Mean Standard deviation Maximum value Minimum value
- _
- .T&
- lw(66p) | cw(36p) | cw(42p) | cw(42p) | cw(42p) .
- 706 8.3 \(+- | .5 14.1 3.8
- _
- .T&
- lw(66p) | cw(36p) | cw(42p) | cw(42p) | cw(42p) .
- Suggested values 9.4 \(+- | .1 17.9 4.2
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau B\(hy2 [T17.3], p.36\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- .rs
- .sp 47P
- .ad r
- \fBFigure B\(hy9, p.\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce 1000
- ANNEX\ C
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 4.3.1.2)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBNoise spectrum calculation\fR
- .sp 1P
- .RT
- .ce 0
- .PP
- Expansion from the scalar value of noise to the spectrum values of both
- room noise and circuit noise is necessary (see Figure\ 4\(hy4). The spectrum
- value database of \fIR\fR\d\fIN\fR\u(60\ dBA) and\ \fIV\fR\d\fIc\fR\u(\(em56.0\
- dBmp) is shown in
- Table\ C\(hy1. The value of room noise is taken from Figure\ 2/P.45\ [50] and
- Figure\ 1 of Supplement\ No.\ 13. \fIV\fR\d\fIc\fR\uis a mixture of circuit
- noise and
- switching office noise. They are expressed by flat noise and \(em8\ dB/octave
- noise, respectively. If only a scalar noise level is known as a test condition,
- .sp 1P
- .RT
- .LP
- and its spectrum value is not known, then a mixed noise spectrum is used in
- OPINE in which \(em8\ dB octave noise is 10\ dB lower than flat noise.
- Moreover,
- SRAEN characteristics are added to the flat noise characteristics.
- .LP
- .sp 2
- .ce
- \fBH.T. [T18.3]\fR
- .ce
- TABLE\ C\(hy1
- .ce
- \fBNoise spectrum value used in OPINE\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(36p) | cw(36p) | lw(42p) | lw(36p) | lw(42p) | lw(36p) .
- \fIR\fI | = 60 dBA \fIV\fI | = \(em56.0 dBmp
- _
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- No. Frequency \fIB \dRNi \u\fR \fIV\fR \dflat \u + SRAEN \fIV\fR \d\(em8/oct \u {
- \fIV
- \dCQi
- \u\fR
- | =
- \fIV\fR
- \dflat
- \u (+)
- \fIV\fR
- \d\(em8/oct
- \u
- }
- _
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- (Hz) (dB) 20 \(*mPa/Hz (dBV/Hz) (dBV/Hz) (dBV/Hz)
- _
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 1 \ 100 42.07 \(em112.91 \ \(em75.25 \ \(em75.25
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 2 \ 125 40.67 \(em102.61 \ \(em77.95 \ \(em77.93
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 3 \ 160 39.07 \ \(em98.11 \ \(em80.55 \ \(em80.47
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 4 \ 200 37.37 \ \(em96.81 \ \(em83.25 \ \(em83.06
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 5 \ 250 35.87 \ \(em95.21 \ \(em85.95 \ \(em85.46
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 6 \ 315 34.37 \ \(em93.31 \ \(em88.55 \ \(em87.29
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 7 \ 400 32.87 \ \(em92.41 \ \(em91.25 \ \(em88.78
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 8 \ 500 31.17 \ \(em91.91 \ \(em93.85 \ \(em89.76
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 9 \ 630 29.57 \ \(em91.51 \ \(em96.55 \ \(em90.32
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 10 \ 800 27.87 \ \(em91.21 \ \(em99.25 \ \(em90.57
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 11 1000 26.37 \ \(em91.21 \(em101.95 \ \(em90.86
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 12 1250 24.77 \ \(em91.21 \(em104.55 \ \(em91.01
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 13 1600 23.07 \ \(em91.11 \(em107.25 \ \(em91.00
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 14 2000 21.37 \ \(em91.01 \(em109.95 \ \(em90.95
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 15 2500 19.57 \ \(em91.01 \(em112.55 \ \(em90.98
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 16 3150 17.37 \ \(em91.21 \(em115.25 \ \(em91.19
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 17 4000 14.87 \(em178.71 \(em117.95 \(em117.95
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 18 5000 12.17 \(em291.21 \(em120.55 \(em120.55
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 19 6300 \ 9.37 \(em291.21 \(em123.25 \(em123.25
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTable C\(hy1 [T18.3], p.\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .sp 3
- .bp
- .ce 1000
- ANNEX\ D
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 4.3.3)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBMDS calculation examples\fR
- .sp 1P
- .RT
- .ce 0
- .PP
- The test condition with an NTT 600 type telephone and a 0.4 mm,
- 7\ dB line as a local telephone
- circuit\ (LTC)\ is considered here. Input
- data
- concerning the LTC is shown in Table\ D\(hy1. In this connection,
- SLR\ =\ 6.6\ dB, and RLR\ =\ \(em3.8\ dB. The test conditions and calculated
- results for fundamental factors are shown in Table\ D\(hy2.
- .sp 1P
- .RT
- .PP
- The output of the overall electro\(hyacoustic calculation (\(sc\ 4.3.1)
- for test condition\ No.\ 11 in Table\ D\(hy2 is shown in Figure\ D\(hy1,
- where OLR is
- 6.4\ dB.
- .LP
- .sp 2
- .ce
- \fBH.T. [T19.3]\fR
- .ce
- TABLE\ D\(hy1
- .ce
- \fBLocal telephone circuit sensitivity\fR
- .ce
- \fB(NTT 600\(hytype telephone set with a 0.4 mm, 7 dB line)\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- No. Frequency \fIS \dMJi \u\fR \fIS \dJEi \u\fR \fIL \dMESTi \u\fR \fIL \dRNSTi \u\fR
- _
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- (Hz) (dB) rel V/Pa (dB) rel Pa/V (dB) (dB)
- _
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 1 \ 100 \(em22.3 \(em40.0 \ 5.3 \ 28.6
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 2 \ 125 \(em25.1 \ \(em2.7 \ 6.7 \ 26.3
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 3 \ 160 \(em23.8 \ \ 2.5 \ 5.0 \ 20.8
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 4 \ 200 \(em18.8 \ \ 7.3 \ 2.3 \ 14.1
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 5 \ 250 \(em14.4 \ 11.3 \(em3.0 \ 5.6
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 6 \ 315 \(em12.3 \ 14.6 \(em6.4 \(em1.3
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 7 \ 400 \(em12.5 \ 15.9 \(em5.6 \(em1.8
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 8 \ 500 \(em12.6 \ 15.7 \(em3.6 \(em0.3
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- \ 9 \ 630 \(em12.3 \ 14.9 \(em2.1 \ 2.8
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 10 \ 800 \(em11.9 \ 14.4 \(em0.4 \ 3.9
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 11 1000 \(em11.6 \ 14.5 \ 0.1 \ 3.4
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 12 1250 \(em12.0 \ 14.8 \ 0.0 \ 3.1
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 13 1600 \(em12.0 \ 14.1 \ 0.1 \ 0.1
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 14 2000 \ \(em9.8 \ 14.4 \(em3.3 \(em2.1
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 15 2500 \(em10.0 \ 16.2 \(em5.0 \ 3.4
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 16 3150 \(em11.0 \ 11.5 \ 2.7 \ 15.0
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 17 4000 \(em16.8 \ \ 8.9 \ 11.1 \ 22.3
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 18 5000 \(em27.9 \(em30.0 \ 28.1 \ 35.1
- .T&
- cw(36p) | cw(36p) | cw(42p) | cw(36p) | cw(42p) | cw(36p) .
- 19 6300 \(em32.0 \(em30.0 \ 32.7 \ 35.3
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau D\(hy1 [T19.3], p.39\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .sp 8
- .bp
- .ce
- \fBH.T. [T20.3]\fR
- .ce
- TABLE\ D\(hy2
- .ce
- \fBExample of estimated results for fundamental factors by
- .ce
- OPINE\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(120p) | cw(36p) | cw(72p) .
- {
- Test conditions
- (STMR = 7.1 dB)
- } Conversion to OPINE input Output
- _
- .TE
- .TS
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- No. Noise OLR (dB) R N (dBA) Circuit noise (dBmp) Switching noise (dBmp) {
- Frequency charac\(hy
- teristic
- (see
- Table D\(hy3)
- } OLR (dB) L (dB) V C (dBmp) PI E L PI N PI A D PI S T OPI MOS
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 1 \(em3.8 \ 0 1 \(em3.6 \(em7.3 \(em95.1 0.63 0.00 0.19 0.15 0.97 2.58
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 2 \ 1.2 \ 0 1 \ 1.4 \(em2.3 \(em95.1 0.23 0.00 0.10 0.15 0.49 3.04
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 3 \ 6.2 \ 0 1 \ 6.4 \ 2.7 \(em95.1 0.03 0.00 0.09 0.15 0.27 3.23
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 4 \ 11.2 \ 0 1 \ 11.4 \ 7.7 \(em95.1 0.40 0.00 0.12 0.15 0.67 2.88
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 5 \ 16.2 \ 0 1 \ 16.4 \ 12.7 \(em95.1 0.80 0.00 0.08 0.15 1.03 2.52
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 6 \ 21.2 \ 0 1 \ 21.4 \ 17.7 \(em95.1 1.20 0.00 0.04 0.15 1.40 2.16
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 7 \ 26.2 \ 0 1 \ 26.4 \ 22.7 \(em95.1 1.61 0.00 0.04 0.15 1.81 1.75
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 8 \ 31.2 \ 0 1 \ 31.4 \ 27.7 \(em95.1 2.02 0.00 0.02 0.15 2.20 1.37
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- \ 9 \(em3.8 60 \(em56.9 \(em62.2 1 \(em3.6 \(em7.3 \(em55.8 0.56 0.21 0.19 0.15 1.12 2.44
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 10 \ 1.2 60 \(em56.9 \(em62.2 1 \ 1.4 \(em2.3 \(em55.8 0.14 0.21 0.10 0.15 0.61 2.93
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 11 \ 6.2 60 \(em56.9 \(em62.2 1 \ 6.4 \ 2.7 \(em55.8 0.15 0.21 0.09 0.15 0.60 2.94
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 12 \ 11.2 60 \(em56.9 \(em62.2 1 \ 11.4 \ 7.7 \(em55.8 0.60 0.21 0.12 0.15 1.08 2.48
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 13 \ 16.2 60 \(em56.9 \(em62.2 1 \ 16.4 \ 12.7 \(em55.8 1.09 0.21 0.08 0.15 1.54 2.02
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 14 \ 21.2 60 \(em56.9 \(em62.2 1 \ 21.4 \ 17.7 \(em55.8 1.62 0.21 0.04 0.15 2.03 1.53
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 15 \ 26.2 60 \(em56.9 \(em62.2 1 \ 26.4 \ 22.7 \(em55.8 2.21 0.23 0.04 0.15 2.64 0.95
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 16 \ 31.2 60 \(em56.9 \(em62.2 1 \ 31.4 \ 27.7 \(em55.8 2.87 0.26 0.02 0.15 3.30 0.41
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 17 \ 1.2 60 \(em56.9 1 \ \ 1.4 \(em2.3 \(em57.0 0.15 0.16 0.10 0.15 0.57 2.97
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 18 \ 11.2 60 \(em56.9 1 \ 11.4 \ 7.7 \(em57.0 0.59 0.16 0.12 0.15 1.02 2.53
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 19 \ 21.2 60 \(em56.9 1 \ 21.4 \ 17.7 \(em57.0 1.61 0.16 0.04 0.15 1.96 1.60
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 20 \ 31.2 60 \(em56.9 1 \ 31.4 \ 27.7 \(em57.0 2.84 0.21 0.02 0.15 3.23 0.47
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 21 \ \ 1.2 50 \(em56.9 \(em62.2 1 \ \ 1.4 \(em2.3 \(em55.8 0.17 0.21 0.10 0.15 0.64 2.90
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 22 \ 11.2 50 \(em56.9 \(em62.2 1 \ 11.4 \ 7.7 \(em55.8 0.53 0.21 0.12 0.15 1.01 2.54
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 23 \ 21.2 50 \(em56.9 \(em62.2 1 \ 21.4 \ 17.7 \(em55.8 1.48 0.21 0.04 0.15 1.89 1.67
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 24 \ 31.2 50 \(em56.9 \(em62.2 1 \ 31.4 \ 27.7 \(em55.8 2.59 0.22 0.02 0.15 2.99 0.65
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 25 \ \ 1.2 45 \(em68.2 \(em68.2 1 \ \ 1.4 \(em2.3 \(em65.2 0.20 0.02 0.10 0.15 0.48 3.05
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 26 \ 13.2 45 \(em68.2 \(em68.2 1 \ 13.4 \ 9.7 \(em65.2 0.63 0.02 0.12 0.15 0.92 2.63
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 27 \ 26.2 45 \(em68.2 \(em68.2 1 \ 26.4 \ 22.7 \(em65.2 1.80 0.02 0.04 0.15 2.02 1.55
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 28 \ \ 1.2 45 \(em63.8 \(em68.2 1 \ \ 1.4 \(em2.3 \(em62.5 0.20 0.04 0.10 0.15 0.50 3.03
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 29 \ 13.2 45 \(em63.8 \(em68.2 1 \ 13.4 \ 9.7 \(em62.5 0.65 0.04 0.12 0.15 0.96 2.60
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 30 \ 26.2 45 \(em63.8 \(em68.2 1 \ 26.4 \ 22.7 \(em62.5 1.84 0.04 0.04 0.15 2.07 1.49
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 31 \ \ 2.2 60 \(em56.9 \(em62.2 3 \ \ 2.5 \(em2.4 \(em55.8 0.07 0.21 0.28 0.15 0.72 2.83
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 32 \ 12.2 60 \(em56.9 \(em62.2 3 \ 12.5 \ 7.6 \(em55.8 0.69 0.21 0.20 0.15 1.25 2.30
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 33 \ 22.2 60 \(em56.9 \(em62.2 3 \ 22.5 \ 17.6 \(em55.8 1.71 0.21 0.12 0.15 2.19 1.37
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 34 \ 32.2 60 \(em56.9 \(em62.2 3 \ 32.5 \ 27.6 \(em55.8 2.95 0.26 0.04 0.15 3.41 0.35
- _
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 35 \ \ 4.1 60 \(em56.9 \(em62.2 7 \ \ 5.1 \(em2.3 \(em55.8 0.02 0.21 0.45 0.15 0.84 2.71
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 36 \ 14.1 60 \(em56.9 \(em62.2 7 \ 15.1 \ 7.7 \(em55.8 0.89 0.21 0.31 0.15 1.57 1.99
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 37 \ 24.1 60 \(em56.9 \(em62.2 7 \ 25.1 \ 17.7 \(em55.8 1.92 0.22 0.18 0.15 2.47 1.10
- .T&
- cw(12p) | cw(24p) | cw(12p) | cw(24p) | cw(24p) | cw(24p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) | cw(12p) .
- 38 \ 34.1 60 \(em56.9 \(em62.2 7 \ 35.1 \ 27.7 \(em55.8 3.16 0.27 0.06 0.15 2.64 0.23
- _
- .TE
- .nr PS 9
- .RT
- .ad r
- \fBTableau D\(hy2 [T20.3], p.40\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce
- \fBH.T. [T21.3]\fR
- .ce
- TABLE\ D\(hy3
- .ce
- \fBAttenuation/frequency characteristics used in
- .ce
- Table D\(hy2\fR
- .ps 9
- .vs 11
- .nr VS 11
- .nr PS 9
- .TS
- center box;
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- Frequency 1 2 3
- _
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \fB.\fR (Hz) SRAEN (dB) (Note 1) (dB) (Note 2) (dB)
- _
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 100 \ \ 21.7 \ 40.0 76.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 125 \ \ 11.4 \ 32.0 60.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 160 \ \ \ 6.9 \ 23.0 47.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 200 \ \ \ 5.6 \ 17.2 36.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 250 \ \ \ 4.0 \ 12.0 24.5
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 315 \ \ \ 2.1 \ \ 6.5 15.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 400 \ \ \ 1.2 \ \ 2.5 \ 7.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 500 \ \ \ 0.7 \ \ 1.0 \ 2.5
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 630 \ \ \ 0.3 \ \ 0.5 \ 0.5
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- \ 800 \ \ \ 0.0 \ \ 0.0 \ 0.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 1000 \ \ \ 0.0 \(em0.1 \ 0.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 1250 \ \ \ 0.0 \(em0.1 \ 0.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 1600 \ \(em0.1 \(em0.3 \ 0.2
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 2000 \ \(em0.2 \(em0.1 \ 0.9
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 2500 \ \(em0.2 \ \ 0.5 \ 2.5
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 3150 \ \ \ 0.0 \ \ 4.0 \ 9.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 4000 \ 87.5 \ 12.5 19.5
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 5000 200.0 \ 22.0 30.0
- .T&
- cw(48p) | cw(48p) | cw(48p) | cw(48p) .
- 6300 200.0 \ 32.0 41.0
- .TE
- .LP
- \fINote 1\fR
- \ \(em\ Three 4\(hywire circuit chains, 50% limit characteristics.
- .LP
- \fINote 2\fR
- \ \(em\ Seven 4\(hywire circuit chains, 95.5% limit
- characteristics.
- .nr PS 9
- .RT
- .ad r
- \fBTableau D\(hy3 [T21.3], p.41\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .rs
- .sp 22P
- .LP
- .bp
- .LP
- .rs
- .sp 31P
- .ad r
- \fBFigure D\(hy1, p.42\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .ce 1000
- ANNEX\ E
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 4.3.2.2)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBDerivation of equation (4\(hy16)\fR
- .sp 1P
- .RT
- .ce 0
- .ad r
- .sp 2
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .LP
- .bp
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .PP
- In employing equations (4\(hy15) and (4\(hy16), a constant is necessary
- for each, that is \(*l\d0\u/C for (4\(hy15) and OLR\d0\ufor (4\(hy16).
- Adaptation of the values in Table\ 4\(hy5 allows a 0.004 error for two
- different \fIPI\fI\d\fIE\fR\\d\fIL\fR\u
- calculations. This error, however, does not cause further errors in subsequent
- calculations.
- .ce 1000
- ANNEX\ F
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em ref. to \(sc 4.3.3)
- .sp 9p
- .RT
- .ce 0
- .ce 1000
- \fBPsychological evaluation model\fR
- .sp 1P
- .RT
- .ce 0
- .PP
- This Annex gives a detailed derivation of equations (4\(hy34) and
- (4\(hy35). The model is a complete adaptation of\ [49].
- .sp 1P
- .RT
- .sp 1P
- .LP
- F.1
- \fIPsychological model for evaluation\fR
- .sp 9p
- .RT
- .PP
- According to the model in reference [49], an evaluation value for a test
- condition on a psychological continuum is shown in Figure\ F\(hy1. \fIp\fR\d\fIK\fR\uis
- defined on page\ 10 of the reference, and is the probability of voting\
- \fIK\fR as an opinion score for a test condition. The correspondences of
- opinion scores to
- ranges in the psychological continuum are:
- .RT
- .LP
- .sp 1
- \fIContinuum range\fR \fIOpinion score\fR \(em \(if
- 0.5
- 0
- 0.5
- 1.5
- 1
- 1.5
- 2.5
- 2
- 2.5
- 3.5
- 3
- 3.5
- \(if
- 4
- .LP
- .rs
- .sp 3P
- .ad r
- \fBFigure F\(hy1, p.\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .LP
- These assumptions satisfy the following equation:
- .ad r
- .ad b
- .RT
- .LP
- which is the same as equation (4\(hy34).
- .sp 1P
- .LP
- F.2
- \fIDerivation of equation (4\(hy35) from equation (4\(hy34)\fR
- .sp 9p
- .RT
- .PP
- The cumulative probability of N (\(*m, \(*s | u2\d) is expressed using a
- standard normal distribution function as follows:
- \v'6p'
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .PP
- By changing the multiplication into a repetition of additions, and by changing
- the association (combination) of addition, equation\ (F\(hy3)
- becomes:
- \v'6p'
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .ad r
- .ad b
- .RT
- .PP
- Replacement of \(*m by \fIP\fR results in equation (4\(hy35), which then
- enables the use of a standard normal distribution table.
- .bp
- .ce 1000
- APPENDIX\ I
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em reference to \(sc\ 3.2.2)
- .sp 9p
- .RT
- .ce 0
- .LP
- 10\ \ PRINT\ \*QCALCULATION OF INFORMATION INDEX FOR CODECS AND MNRU\*U
- .sp 1P
- .RT
- .LP
- 20\ \ REM\ New frequency weighting, Ti from BOSQUET, new equivalence
- with MNRU
- .LP
- 30\ \ REM\ PROGRAM ICQSKBE2, BAS, June 1987, written in MF BASIC
- .LP
- 40\ \ INPUT\ \*QSYSTEM\*U; S$
- .LP
- 50\ \ INPUT\ \*QMOS\*U; Y$
- .LP
- 60\ \ INPUT\ \*QK1(0 for MNRU, 5.2 in other cases)=\*U; K1
- .LP
- 70\ \ DATA\ .05457, 4.1, .04733, 5.6, .06682,
- 6.4, .07497, 6.9, .06546, 7.4, .06622, 7.8, .05585,
- 8, .054, 8, .05273, 8.2,
- \ \ \ \ .05117, 8.2
- .LP
- 80\ \ DATA\ .04517, 8.2, .04706, 8.2, .05073,
- 8.2, .05561, 8.2, .0631, 8.2, 06886, 8.1
- .LP
- 90\ \ INPUT\ \*QQSEG over the band\(emQP=d(0 for MNRU and PCM)\*U; SM
- .LP
- 100\ REM\ calculation for codecs (for MNRU if K1=d=0)
- .LP
- 110\ FOR\ J=1 to 16
- .LP
- 120\ PRINT\ \*QQseg over the band No\*U; J
- .LP
- 130\ INPUT\ QS
- .LP
- 140\ READ\ B, C
- .LP
- 150\ QC=QS+C
- .LP
- 160\ K2=1(1+EXP(\(em.159673*QC+.157246))
- .LP
- 170\ Q=K1+QC+K2*SM
- .LP
- 180\ V=3/(.1+10 \* | (\(emQ/10))
- .LP
- 190\ I=B*V
- .LP
- 200\ II=II+I
- .LP
- 210\ NEXT\ J
- .LP
- 220\ REM\ Display of results
- .LP
- 230\ PRINT\ S$,\*QII=\*U; II
- .LP
- 240\ LPRINT\*Q\ \ \ \*U; S$; TAB(20); K1; TAB(30);
- SM; TAB(40); II; TAB(50); Y$; TAB(60)
- .LP
- 250\ END
- .LP
- .rs
- .sp 13P
- .ad r
- \fBTable T22.3, p.\fR
- .sp 1P
- .RT
- .ad b
- .RT
- .LP
- .bp
- .ce 1000
- APPENDIX\ II
- .ce 0
- .ce 1000
- (to Supplement No. 3 \(em reference to \(sc\(sc\ 3.2.2 and 3.3)
- .sp 9p
- .RT
- .ce 0
- .LP
- 10\ \ PRINT\ \*QCalculation of Information Index for NTT 600 sets (7\ dB
- line)\*U
- .sp 1P
- .RT
- .LP
- 20\ \ REM\ Program INT600E5 , written in MF Basic, September 1987
- .LP
- 30\ \ INPUT\ \*QRoom noise,dBA=\*U; RN
- .LP
- 40\ \ INPUT\ \*QSTMR,dB=\*U; STMR
- .LP
- 50\ \ INPUT\ \*QCircuit noise level (dBm, sign changed) at input to
- 0\ dB
- \ \ \ \ RLR end\*U; I
- .LP
- 60\ \ ICNO=\(emI
- .LP
- 70\ \ INPUT\ \*QListening (L) or conversation (C) or terminate (T)\*U; A$
- .LP
- 80\ \ IP\ A$=\*QT\*U GOTO 640
- .LP
- 90\ \ IF\ A$=\*QC\*U GOTO 560
- .LP
- 100\ INPUT\ \*QOverall loudness rating (P79),dB=\*U; OLR
- .LP
- 110\ LPRINT\ \*Q\ \ \ OLR=\*U; OLR
- .LP
- 120\ GOSUB\ 730
- .LP
- 130\ REM\ Correction for excessive loudness
- .LP
- 140\ IF\ OLR>OPT GOTO 380
- .LP
- 150\ \(mu=2*OPT\(emOLR
- .LP
- 160\ GOTO\ 390
- .LP
- 170\ DIM\ FE (20), CN(20), ST(20), EL(20), BK(20), S(20), BJ(20), CJ(20),
- SRL(20), B1(20)
- .LP
- 180\ DATA\ \(em36.2, \ \(em76.9, \ \ \(em4.1, \ 32.4, \ 17.5, | 56.0, |
- .00804, | 0 | \ , | \ 62.3, | \ 21.7
- .LP
- 190\ DATA\ \(em26.2, \ \(em34.9, \ \ \(em3 | , \ 31.2, \ 14.4, | 61.1, |
- .01042, | 1.25, | \ 27.8, | \ 11.4
- .LP
- 200\ DATA\ \(em18.3, \ \(em24 | , \ \ \ \ .8, \ 29.5, \ 10 | , | 62.5, |
- .0138\ , | 2 | \ , | \ 21.3, | \ \ 6.9
- .LP
- 210\ DATA\ \ \(em9.9, \ \(em13.2, \ \ \ 5.6, \ 27.6, \ \ 5 | , | 64.3, |
- .01788, | 2.6\ , | \ 11.5, | \ \ 5.6
- .LP
- 220\ DATA\ \ \(em2.1, \ \ \(em3.1, \ \ 12.7, \ 26.2, \ \ 2.5, | 64 | , |
- .02392, | 3.5\ , | \ \ 3.1, | \ \ 4 |
- .LP
- 230\ DATA\ \ \ 2.2, \ \ \ 6.9, \ \ 16.4, \ 22.3, \ \ \(em.4, | 60.7, |
- .03246, | 4.9\ , | \(em2.3, | \ \ 2.1
- .LP
- 240\ DATA\ \ \ 3.9, \ \ 11.1, \ \ 16.6, \ 22.7, \ \(em3 | , | 59.8, |
- .04471, | 5.8\ , | \(em3.4, | \ \ 1.2
- .LP
- 250\ DATA\ \ \ 3.2, \ \ 13 | , \ \ 13.5, \ 21.1, \ \(em5 | , | 59.4, |
- .05981, | 6.35, | \(em3.1, | \ \ \ .7
- .LP
- 260\ DATA\ \ \ \ .8, \ \ 12.9, \ \ \ 8.9, \ 17.4, \ \(em6.3, | 56.3, |
- .07789, | 7.25, | \(em2.6, | \ \ \ .3
- .LP
- 270\ DATA\ \ \ \ .3, \ \ 13.2, \ \ \ 6 | , \ \ 9.3, \ \(em8 | , | 52.4, |
- .0839\ , | 7.35, | \(em2.5, | \ \ 0 |
- .LP
- 280\ DATA\ \ \ 0 | , \ \ 12.4, \ \ \ 4.9, \ \ 2.7, \ \(em9 | , | 47.6, |
- .0899\ , | 7.8\ , | \(em2.9, | \ \ 0 |
- .LP
- 290\ DATA\ \ \(em1.8, \ \ 11.5, \ \ \ 3.6, \ \ \(em.9, \ \(em8.5, | 45.2, |
- .09627, | 8.05, | \(em2.8, | \ \ 0 |
- .LP
- 300\ DATA\ \ \ \(em.3, \ \ \ 9.7, \ \ \ 4.9, \ \(em7.1, \ \(em8 | , |
- 44 | , |
- .10376, | 8.25, | \(em2.1, | \ \(em.1
- .LP
- 310\ DATA\ \ \ \(em.8, \ \ \ 6.4, \ \ \ 5.5, \(em12.4, \ \(em9 | , | 41.4, |
- .11097, | 8.3\ , | \(em4.6, | \ \(em.2
- .LP
- 320\ DATA\ \ \(em9.9, \ \ \ 4.9, \ \ \(em1.7, \(em20.4, \(em11.5, | 38.8, |
- .11859, | 8.18, | \(em6.2, | \ \(em.2
- .LP
- 330\ DATA\ \(em17.1, \ \ \(em2.4, \ \(em15.4, \(em19.2, \(em13.8, | 34.7, |
- .12694, | 7.95, | \ \(em.5, | \ \ 0 |
- .LP
- 340\ DATA\(em111.4, \ \(em54.7, \ \(em24.8, \(em28.1, \(em13 | , | 31 | , |
- .13607, | 7.57, | \ \ 7.9, | \ 87.5
- .LP
- 350\ DATA\(em233.6, \(em144.8, \ \(em40.4, \(em38.4, \(em12.5, | 27.8, |
- .14506, | 7.25, | \ 57.9, | 200 |
- .LP
- 360\ DATA\(em237.2, \(em147.3, \ \(em44.5, \(em51.3, \(em11.1, | 26.1, |
- .15487, | 7.2\ , | \ 62 | , | 200 |
- .LP
- 370\ DATA\(em292.9, \(em199.8, \(em104.5, \(em66.6, \ \(em9 | , | 25.5, |
- .16554, | 6.8\ , | \ 80 | , | 200 |
- .LP
- 380\ X=OLR
- .LP
- 390\ DEF\ FNP (Y)=10 \* | (Y/10)
- .LP
- 400\ IN=0
- .bp
- .LP
- 410\ FOR\ J=1 TO 20
- .LP
- 420\ READ\ FE, CN, ST, EL, BK, S, BJ, CJ, SRL, D1
- .LP
- 425\ REM\ Calculation and composition of signal to noise and equivalent ratio
- .LP
- 430\ PN=FNP(FE+RN\(em50\(emX+5)+FNP(CN+ICNO+60)+FNP(ST+RN\(em50\(emSTMR+15)
- \ \ \ \ +FNP(EL+RN\(em50)
- .LP
- 440\ ZN=S+.4\(hySRL\(emD1\(emX+6.4\(em4.343*LOG(PN)
- .LP
- 450\ ZA=S+.8\(emSRL\(emD1\(emX\(emBK
- .LP
- 460\ IF\ ZA>0 THEN PE =(1+ZA/9.5) \* | 2\(em1: GOTO 470
- .LP
- 465\ PE=1E\(em10
- .LP
- 470\ P=FNP (\(emZN)+1/PE
- .LP
- 480\ Z=\(em4.343*LOG(P)
- .LP
- 490\ GOSUB 660
- .LP
- 500\ G=BJ*V
- .LP
- 510\ IN=IN+G
- .LP
- 520\ NEXT\ J
- .LP
- 530\ PRINT\ \*QIN=\*U; IN
- .LP
- 540\ LPRINT\ \*Q\ \ \ RN(dBA)=\*U; RN; \*QSTMR(dB)=\*U; STMR; \*QX(dB)=\*U;
- X; \*QICN0(dB)=\*U;
- ICN0;
- \ \ \ \ \*QIN(dB)=\*U; IN
- .LP
- 550\ GOTO\ 70
- .LP
- 560\ RESTORE
- .LP
- 570\ REM\ Speech power correction for sidetone and quality of conversation
- .LP
- 580\ IF\ STMR>13 THEN 590 ELSE 610
- .LP
- 590\ CS=0
- .LP
- 600\ GOTO 620
- .LP
- 610\ CS=.3*(STMR\(em13)
- .LP
- 620\ X=X\(emCS+.4085*IN\(em9.87
- .LP
- 630\ GOTO 390
- .LP
- 640\ END
- .LP
- 650\ REM\ Equivalence law and calculation of V
- .LP
- 660\ IF\ Z<1.74 THEN 670 ELSE 690
- .LP
- 670\ Q=Z+CJ
- .LP
- 680\ GOTO 700
- .LP
- 690\ Q=.494*Z+.88+CJ
- .LP
- 700\ V=3/(.1+10 \* | (\(emQ/10))
- .LP
- 710\ RETURN
- .LP
- 720\ REM\ Determination of optimum OLR
- .LP
- 730\ RNS=RN\(em115+.006*(RN\(em30) \* | 2\(emSTMR\(em7.9
- .LP
- 740\ RNL=RN\(em121
- .LP
- 750\ PC=10 \* | (ICN0/10)
- .LP
- 760\ PRL=10 \* | (RNL/10)
- .LP
- 770\ PRS=10 \* | (RNS/10)
- .LP
- 780\ N1=4.343*LOG(PC+PRL+PRS)
- .LP
- 790\ IF\ N1<\(em80 THEN OPT=7.2:RETURN
- .LP
- 800\ OPT=7.2\(em(N1+80)/8
- .LP
- 810\ RETURN
- .bp
- .sp 2P
- .LP
- \fBReferences\fR
- .sp 1P
- .RT
- .LP
- [1]
- CAVANAUGH (J. | .), HATCH (R. | .) and SULLIVAN (J. | .): Models for the
- subjective effects of loss, noise and talker echo on telephone connections,
- \fIB.S.T.J.\fR , Vol.\ 55, No.\ 9, pp.\ 1319\(hy1371,
- November,\ 1976.
- .LP
- [2]
- SULLIVAN (J. | .): A laboratory system for measuring loudness loss
- of telephone connections, \fIB.S.T.J.\fR ,\fR Vol.\ 50, No.\ 8, pp.\ 2663\(hy2739,
- October\ 1971.
- .LP
- [3]
- CCITT\ \(em\ Question 4/XII, Contribution COM XII\(hyNo.\ R12,
- Study Period 1985\(hy1988, Geneva,\ 1986.
- .LP
- [4]
- CAVANAUGH (J. | .), HATCH (R. | .) and NEIGH (J. | .): A model for
- the subjective effects of listener echo on telephone
- connections, \fIB.S.T.J.\fR , Vol.\ 59, No.\ 6,
- pp.\ 1009\(hy1060, July\(hyAugust\ 1980.
- .LP
- [5]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 13, (Bell\(hyNorthern Research),
- Study Period 1981\(hy1984, Geneva,\ 1981.
- .LP
- [6]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 14, (Bell\(hyNorthern Research),
- Study Period 1981\(hy1984, Geneva,\ 1981.
- .LP
- [7]
- DAUMER (W. | .) and CAVANAUGH (J. | .): A subjective comparison of
- selected digital codecs for speech, \fIB.S.T.J.\fR ,
- Vol.\ 57, No.\ 9, pp.\ 3119\(hy3165, November\ 1978.
- .LP
- [8]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 173, (American Telephone and
- Telegraph Company), Study Period 1977\(hy1980, Geneva,\ 1979.
- .LP
- [9]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 94, (American Telephone and
- Telegraph Company), Study Period 1981\(hy1984, Geneva,\ 1982.
- .LP
- [10]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 159, (American Telephone and
- Telegraph Company), Study Period 1977\(hy1980, Geneva,\ 1979.
- .LP
- [11]
- CCITT\ \(em\ Contribution COM XII\(hyNo. 158, (American Telephone and
- Telegraph Company), Study Period 1981\(hy1984, Geneva,\ 1983.
- .LP
- [12]
- AHERN (W. | .), DUFFY (F. | .) and MAHER (J. | .): Speech signal power
- in the switched message network, \fIB.S.T.J.\fR , Vol.\ 57, No.\ 7,
- pp.\ 2695\(hy2726, September\ 1978.
- .LP
- [13]
- CUMMISKEY (P.), JAYANT (N. | .) and FLANAGAN (J. | .): Adaptive
- quantization in differential PCM coding of speech, \fIB.S.T.J.\fR ,
- Vol.\ 52, No.\ 7, pp.\ 1105\(hy1118, September\ 1973.
- .LP
- [14]
- CCITT\ \(em\ Question 7/XII, Contribution COM\ XII\(hyNo.\ 1,
- Study Period 1985\(hy1988, Geneva.
- .LP
- [15]
- RICHARDS (D. | .): Calculation of opinion scores for telephone
- connections, \fIProc. I.E.E.\fR , Vol.\ 121, No.\ 5, pp.\ 313\(hy323,
- May\ 1974.
- .LP
- [16]
- CCITT\ \(em\ Question 7/XII, Annex 2, Contribution COM XII\(hyNo. 1,
- Study Period 1977\(hy1980, Geneva, 1977.
- .LP
- [17]
- CCITT Contribution COM\ XII\(hyNo.\ 113, \fISome remarks on the structure
- of\fR \fIa telephone connection assessment model\fR , Study Period\ 1977\(hy1980,
- Geneva,
- October\ 1978.
- .LP
- [18]
- CCITT Contribution COM\ XII\(hyNo.\ 129, \fIUse of a telephone connection\fR
- \fIassessment model in the study of Question\ 15/XII\fR , Study Period\
- 1977\(hy1980,
- Geneva, February\ 1979.
- .LP
- [19]
- WEBB (P. | .): The background and philosophy of the telephone network
- assessment program (CATNAP), British Post Office Research Department
- Report No.\ 752,\ 1979.
- .LP
- [20]
- CCITT Draft Recommendation P.XXE, Question 15/XII, Annex\ 2 (II),
- Contribution COM XII\(hyNo.1, Study Period 1977\(hy1980, Geneva, 1977.
- .LP
- [21]
- \fIPrediction of transmission qualities from objective measurements\fR ,
- Yellow Book, Volume\ V, Supplement No.\ 4, ITU, Geneva,\ 1981.
- .LP
- [22]
- RICHARDS (D. | .): Telecommunication by speech: The transmission
- performance of telephone networks, Chapter\ 3, \fIButterworths\fR , London,\
- 1973.
- .LP
- [23]
- RICHARDS (D. | .): Telecommunication by speech: The transmission
- performance of telephone networks, Chapter\ 2, \fIButterworths\fR , London,\
- 1973.
- .LP
- [24]
- CCITT\ \(em\ Question 15/XII, Annex 1, \(sc\ 3, Contribution COM\ XII\(hyNo.\
- 1,
- Study Period\ 1981\(hy1984, Geneva,\ 1981.
- .LP
- [25]
- CCITT\ \(em\ Question 19/X11, Contribution COM\ XII\(hyNo.\ 1, Study Period
- 1981\(hy1984, Geneva,\ 1981.
- .bp
- .LP
- [26]
- CCITT\ \(em\ Question 15/XII, Contribution COM\ XII\(hyNo.\ 1, Study Period
- 1977\(hy1980, Geneva,\ 1977.
- .LP
- [27]
- RICHARDS (D. | .): Telecommunication by speech: The transmission
- performance of telephone networks, p.\ 57, \fIButterworths\fR , London,\ 1973.
- .LP
- [28]
- RICHARDS (D. | .): Transmission performance of telephone networks
- containing P.C.M. links, \fIProceedings of the I.E.E.\fR , Vol.\ 115,
- No.\ 9, pp.\ 1245\(hy1258, September\ 1968.
- .LP
- [29]
- CCITT Handbook \fITransmission planning of switched telephone network\fR
- , Chapter\ II, Annex\ 3, ITU, Geneva,\ 1976.
- .LP
- [30]
- BOERYD (A.): Subscriber reaction due to unbalanced transmission levels,
- \fIThird International Symposium on Human Factors in Telephony\fR , 1966,
- pp. 39\(hy43, The Hague, 1967.
- .LP
- [31]
- LALOU (J.): a paper to be published in \fIAnnales des\fR \fIT\*'el\*'ecommunications\fR
- .
- .LP
- [32]
- CCITT\ \(em\ Question 7/XII, Contribution COM\ XII\(hyNo.\ 1,
- Study Period 1985\(hy1988.
- .LP
- [33]
- RICHARDS (D. | .): Calculation of opinion scores for telephone
- connections, \fIProc. I.E.E.\fR , Vol.\ 121, No.\ 5, pp.\ 313\(hy323,
- May\ 1974.
- .LP
- [34]
- ALCAIM (A.): Essai de d\*'etermination d'un indice objectif de mesure
- de la qualit\*'e des codeurs. \fICNET\fR , Report RP/LAA/TSS/208, May 1984.
- .LP
- [35]
- RICHARDS (D. | .): private communication
- .LP
- [36]
- OPINE (Rev. 2.0.), Electrical Communication Laboratories NTT, September 1986.
- .LP
- [37]
- RICHARDS (D. | .), BARNES (G. | .): Pay\(hyoff between quantizing distortion
- and injected circuit noise, in \fIProc. ICASSP 82\fR Vol.\ 2, pp.\ 984\(hy987,
- Paris,
- May 1982.
- .LP
- [38]
- CCITT\(hyContribution COM XII\(hyR.17, Report of WP XII/3 meeting in
- Budapest, May 1987 (Reply to Question\ 4/XII).
- .LP
- [39]
- CCITT\(hyContribution COM XII\(hyNo. 174, Transmission performance objective
- evaluation model for fundamental factors, (NTT), Geneva, 1983.
- .LP
- [40]
- CCITT\(hyContribution COM XII\(hy235, Calculation method of OPINE, (NTT),
- Geneva 1984.
- .LP
- [41]
- CCITT\(hyContribution COM XII\(hy10, Objective evaluation model of telephone
- transmission performance for fundamental transmission factors and quantizing
- distortion, (NTT), Geneva 1985.
- .LP
- [42]
- OSAKA (N.) and KAKEHI (K.): Objective model for evaluating telephone
- transmission performance, \fIReview of ECL\fR , Vol.\ 34, No.\ 4, 1986.
- .LP
- [43]
- NTT: OPINE (Rev. 2.0), private communication, Sept. 1986
- .LP
- [44]
- IAI (S.) and IRII (H.): Subjective assessment of echo delay time
- effect, \fIConference record of Acous. Soc. of Japan\fR , 2\(hy7\(hy8,
- (1983\(hy03) (in
- Japanese).
- .LP
- [45]
- IAI (S.) \fIet al.\fR : A study on subjective assessment of telephone
- speech
- sidetone \fIConference record of Acous. Soc. of Japan\fR , 2\(hy2\(hy3,
- (1978\(hy05) (in
- Japanese).
- .LP
- [46]
- OSAKA (N.) and KAKEHI (K.): A study on the psychological factors that
- affect the opinion evaluation of telephone transmission performance., \fITrans.\fR
- \fIIECE\fR , Vol.\ J69\(hyA, No.\ 5, 1986 (in Japanese).
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- [47]
- IRII (H.): Loudness equivalent attenuation of speech in the presence
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- (1975\(hy05) (in
- Japanese).
- .LP
- [48]
- ISO Recommendation R226: Normal equal loudness contours for pure tones
- and normal threshold of hearing under free\(hyfield listening conditions,
- Dec.\ 1961.
- .LP
- [49]
- CAVANAUGH, (J. | .), HATCH, (R. | .) and SULLIVAN (J. | .): Models for
- the subjective effects of loss, noise and talker echo on telephone connections,
- \fIB.S.T.I.\fR Vol.\ 55, No.\ 9, 1976.
- .LP
- [50]
- CCITT Recommendation \fIMeasurement of the AEN Value of a commercial\fR
- \fItelephone system\fR . Yellow Book, Vol.\ V, Rec.\ P.45, ITU, Geneva, 1981.
- .LP
- .bp
-