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- From: dave@pipi.iis.u-tokyo.ac.jp (David Wuertele)
- Subject: Re: MD and DCC encoding-request for info
- In-Reply-To: shetline@bbn.com's message of 28 Dec 1992 02: 52:19 GMT
- Message-ID: <DAVE.92Dec30234952@pipi.iis.u-tokyo.ac.jp>
- Followup-To: rec.audio
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- Organization: Institute of Industrial Science, University of tokyo.
- References: <shetline-271292211904@128.89.19.80>
- Date: Wed, 30 Dec 1992 14:49:52 GMT
- Lines: 14
-
- In article <shetline-271292211904@128.89.19.80> shetline@bbn.com (Kerry Shetline) writes:
- > If they [MD or DCC] only handle PCM data, would there be a generational
- > degradation when copying MDs/DCCs (forgetting about serial copy mgt for the
- > moment)? It seems to me quite likely that there could be -- calculation
- > round-offs, inconsistent "framing" of the PCM data stream...
-
- Yes, there will be if there is any type of vector quantization going on in
- the compression (block transform + quant schemes are a subset of all
- vector quant schemes), because the PCM data stream has no framing
- information to keept the vectors consistent. There is also a possibility
- that pre- and post- filtering is conducted, which will degrade even more.
-
- Dave
-
-