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- Path: sparky!uunet!news.larc.nasa.gov!grissom.larc.nasa.gov!kludge
- From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
- Newsgroups: talk.bizarre
- Subject: Re: CD vs. LP again (was Re: Preamp and Amp)
- Date: 27 Jan 1993 14:34:24 GMT
- Organization: NASA Langley Research Center and Reptile Farm
- Lines: 20
- Message-ID: <1k66hgINNr6t@rave.larc.nasa.gov>
- References: <1k1fl5INNgub@rave.larc.nasa.gov> <ben.728006966@ipoint> <9301262023.28@rmkhome.UUCP>
- NNTP-Posting-Host: grissom.larc.nasa.gov
-
- In article <9301262023.28@rmkhome.UUCP> rmkhome!rmk@merk.com (Rick Kelly) writes:
- >In article <ben.728006966@ipoint> thoth@uiuc.edu (Ben Cox) writes:
- >>
- >>I'm just pissed that Philips is actually DARING to advertise that
- >>DCC's have the same quality sound as CD. I do NOT see how they can
- >>get away with that.
- >
- >Well, CD's are made from a digital master tape.
-
- Yes, but they are a faithful copy of the digital master tape. The bits that
- are set on the PCM 630 master are the exact bits that are set on the disc.
- This is not the case with DCC... DCC and MD both use a lossy compression
- scheme so that 75% of the bits are discarded, and an approximation of the
- original bitstream is constructed from the compressed bitstream on the tape.
-
- A lot of psychoacoustic research went into determining what could be thrown
- out and what couldn't. From the sound of it, a lot more research went into
- DCC than MD. If you are curious about the mathematics, check out the article
- in the Phillips Technical Journal.
- --scott
-