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- From: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
- Newsgroups: sci.electronics
- Subject: Re: "Super-CD" ... soon ?
- Message-ID: <0095F14F.CB58E9C0@FHYDRA.FYSEL.UNIT.NO>
- Date: 14 Aug 92 15:47:34 GMT
- References: <1992Jul29.183848.1367@gnv.ifas.ufl.edu> <712556100snx@black.demon.co.uk>,<2460@ulysse.enst.fr>
- Sender: news@ugle.unit.no (NetNews Administrator)
- Reply-To: dahls@fhydra.dnet.unit.no (Joern Yngve Dahl-Stamnes)
- Organization: University of Trondheim, NORWAY
- Lines: 39
-
- Thus spoke the keyboard of krueger@cal.enst.fr (Martin Krueger):
- >In article <712556100snx@black.demon.co.uk> tchannon@black.demon.co.uk (Tim
- >Channon) writes:
- >
- >>
- >>Do you have any idea of what >90dB dynamic range really means?
- >>
- >
- >I've once seen a chart explaining the usable dynamic range of a compact disc in
- >professional use (with 16 bit depht). What I remember is :
- >
- >1) On the upper end of the theoretical 90dB range they have to cut off 10dB as
- >a clipping reserve, since digital clipping would immediatly destroy a whole
- >recording.
- >
- >2) You cannot really use the lower 30-40dB of the 90dB range, since distorsion
- >becomes too high (up to 40% in the first 10db range, as far as I remember). The
- >reason for this is the decreasing resolution of the sampling device at lower
- >input levels.
- >
- >Thus the reamining usable dynamic range of a compact disc doesn't exceed
- >40-50dB, that is still a lot but can be outperformed by analog recordings.
-
- I think it depend of what kind of music that is recorded. Hard rock music
- may need the upper 10 dB for clipping reserve, while classic music don't
- need that much. My opinion is that there is more than 40-50 dB dynamic
- range on a classic CD.
-
- I got one classic CD with church organ music and I can hear the birds
- singing outside the church while in the organ is silent. And on another CD
- I can here papers sheets beeing moved. I have never heard it on LP's.
-
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- * I went back to my mother, * Joern Yngve Dahl-Stamnes *
- * I said, "I'm crazy ma, help me!" * University of Trondheim *
- * She said, "I know how it feels son, * The Norwegian Institute of Tech. *
- * 'cause it runs in the family." * Division of Physical Electronics *
- * - The Who, Quadrophenia * e-mail: dahls@fhydra.dnet.unit.no *
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