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- Information on 2400 bps LPC and 4800 bps CELP speech coders
- for Frequently Asked Questions lists (audio-formats, comp.compression)
-
- The U.S. DoD's Federal-Standard-1016 based 4800 bps code excited linear
- prediction voice coder version 3.2 (CELP 3.2) Fortran and C simulation
- source codes are available for worldwide distribution (on DOS
- diskettes, but configured to compile on Sun SPARC stations) from NTIS
- and DTIC. Example input and processed speech files are included. A
- Technical Information Bulletin (TIB), "Details to Assist in
- Implementation of Federal Standard 1016 CELP," and the official
- standard, "Federal Standard 1016, Telecommunications: Analog to
- Digital Conversion of Radio Voice by 4,800 bit/second Code Excited
- Linear Prediction (CELP)," are also available.
-
- This is available through the National Technical Information Service:
-
- NTIS
- U.S. Department of Commerce
- 5285 Port Royal Road
- Springfield, VA 22161
- USA
- (703) 487-4650
-
- The "AD" ordering number for the CELP software is AD M000 118
- (US$ 90.00) and for the TIB it's AD A256 629 (US$ 17.50). The LPC-10
- standard, described below, is FIPS Pub 137 (US$ 12.50). There is a
- $3.00 shipping charge on all U.S. orders. The telephone number for
- their automated system is 703-487-4650, or 703-487-4600 if you'd prefer
- to talk with a real person.
-
- (U.S. DoD personnel and contractors can receive the package from the
- Defense Technical Information Center: DTIC, Building 5, Cameron
- Station, Alexandria, VA 22304-6145. Their telephone number is
- 703-274-7633.)
-
- The following articles describe the Federal-Standard-1016 4.8-kbps CELP
- coder (it's unnecessary to read more than one):
-
- Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch,
- "The Federal Standard 1016 4800 bps CELP Voice Coder," Digital Signal
- Processing, Academic Press, 1991, Vol. 1, No. 3, p. 145-155.
-
- Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch,
- "The DoD 4.8 kbps Standard (Proposed Federal Standard 1016),"
- in Advances in Speech Coding, ed. Atal, Cuperman and Gersho,
- Kluwer Academic Publishers, 1991, Chapter 12, p. 121-133.
-
- Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The
- Proposed Federal Standard 1016 4800 bps Voice Coder: CELP," Speech
- Technology Magazine, April/May 1990, p. 58-64.
-
-
- The U.S. DoD's Federal-Standard-1015/NATO-STANAG-4198 based 2400 bps
- linear prediction coder (LPC-10) was republished as a Federal
- Information Processing Standards Publication 137 (FIPS Pub 137).
- It is described in:
-
- Thomas E. Tremain, "The Government Standard Linear Predictive Coding
- Algorithm: LPC-10," Speech Technology Magazine, April 1982, p. 40-49.
-
- There is also a section about FS-1015 in the book:
- Panos E. Papamichalis, Practical Approaches to Speech Coding,
- Prentice-Hall, 1987.
-
- The voicing classifier used in the enhanced LPC-10 (LPC-10e) is described in:
- Campbell, Joseph P., Jr. and T. E. Tremain, "Voiced/Unvoiced Classification
- of Speech with Applications to the U.S. Government LPC-10E Algorithm,"
- Proceedings of the IEEE International Conference on Acoustics, Speech, and
- Signal Processing, 1986, p. 473-6.
-
- Copies of the official standard
- "Federal Standard 1016, Telecommunications: Analog to Digital Conversion
- of Radio Voice by 4,800 bit/second Code Excited Linear Prediction (CELP)"
- are available for US$ 5.00 each from:
-
- GSA Federal Supply Service Bureau
- Specification Section, Suite 8100
- 470 E. L'Enfant Place, S.W.
- Washington, DC 20407
- (202)755-0325
-
- Realtime DSP code for FS-1015 and FS-1016 is sold by:
-
- John DellaMorte
- DSP Software Engineering
- 165 Middlesex Tpk, Suite 206
- Bedford, MA 01730
- USA
- 1-617-275-3733
- 1-617-275-4323 (fax)
- dspse.bedford@channel1.com
-
- DSP Software Engineering's FS-1016 code can run on a DSP Research's Tiger 30
- (a PC board with a TMS320C3x and analog interface suited to development work).
-
- DSP Research
- 1095 E. Duane Ave.
- Sunnyvale, CA 94086
- USA
- (408)773-1042
- (408)736-3451 (fax)
-
-