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- Path: sparky!uunet!mcsun!corton!enst!ulysse!cal.enst.fr
- From: krueger@cal.enst.fr (Martin Krueger)
- Newsgroups: sci.electronics
- Subject: Re: "Super-CD" ... soon ?
- Message-ID: <2460@ulysse.enst.fr>
- Date: 14 Aug 92 08:31:49 GMT
- References: <1992Jul29.183848.1367@gnv.ifas.ufl.edu> <712556100snx@black.demon.co.uk>
- Sender: news@ulysse.enst.fr
- Organization: Telecom Paris
- Lines: 24
-
- 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.
-
-
- M A R T I N
-