home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!think.com!spool.mu.edu!uwm.edu!csd4.csd.uwm.edu!info-high-audio-request
- From: bill@rsphy1.anu.edu.au (Bill Alford)
- Newsgroups: rec.audio.high-end
- Subject: CD precision
- Date: 27 Jan 1993 22:52:33 GMT
- Organization: SCU, RSPhyScE, Australian National University, Canberra
- Lines: 31
- Approved: tjk@csd4.csd.uwm.edu
- Distribution: world
- Message-ID: <1k8p6iINNjo4@uwm.edu>
- Reply-To: bill@rsphy1.anu.edu.au (Bill Alford)
- NNTP-Posting-Host: 129.89.7.4
- Originator: tjk@csd4.csd.uwm.edu
-
-
- In a review of the Vimak DS-2000 DAC in Australian Hi-Fi, the following
- statements are made:
- "The Vimak accepts up to 24 bits of external audio data. At present, the
- standard CD data-stream cannot provide this level of precision, but it
- seems likely that that by using presently unused channels on CD's to
- encode additional data, 24 bit precision on CD, with no loss of playing
- time, and no loss of compatibility, is more than just a possibility, its
- a probability. In the US, the smaller specialist record labels are
- already investigating the encoding algorithms necessary to perform this
- clever trick."
- I am seeking comments on these interesting statements, and any further
- information that people may have on this. Is this of any relevance to
- the current recording pratice of recording at 20-bits and Sony's SBM
- process? Is this possibly used in the HDCD process where the New York
- Times article stated that the HDCD process samples at several hundred
- K samples per second, and 20 bits and then uses some algorithm to get
- rid of redundant information? To exploit this potential we may see
- completely new DAC's with DSP chips in them like in the Vimak.
-
- ===========================================================================
- | Bill Alford, | Email: bill@rsphys.anu.edu.au |
- | School Computer Unit, | Tel: 61 6 249 2143 |
- | Research School of Physical Sciences | Fax: 61 6 249 1884 |
- | and Engineering, | N _--_|\ |
- | Australian National University, | W + E / \ |
- | GPO Box 4, | S \_.--._*<-- Canberra |
- | Canberra City, ACT 2601 | v [35S, 149E] |
- | Australia O, what a journey of Discovery we are on ... |
- ===========================================================================
-
-