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- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!cleveland.Freenet.Edu!bt979
- From: bt979@cleveland.Freenet.Edu (Jeff Preston)
- Newsgroups: bit.listserv.allmusic
- Subject: Re: Trying to keep up
- Date: 21 Jan 1993 18:46:42 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 53
- Message-ID: <1jmr2iINN6d3@usenet.INS.CWRU.Edu>
- References: <ALLMUSIC%93012112584401@AUVM.AMERICAN.EDU>
- Reply-To: bt979@cleveland.Freenet.Edu (Jeff Preston)
- NNTP-Posting-Host: hela.ins.cwru.edu
-
-
- In a previous article, ST402711@BROWNVM.BITNET (Tim Johnson) says:
-
- >because the info is recorded digitally in a fixed number of bits,
- >there is a fixed maximum number. that means that the CD output
- >has a fixed maximum volume, which is that largest storeable
- >number run through the D/A and any amplification stages - all
- >of which are fixed in the CD player.
-
- >if the CD is well engineered, the maximum volume of the music
- >to be recorded will be recorded at a level close to the maximum
- >integer able to be stored on the CD.
-
- For the most part, I think you're right on this count, but I don't
- have that much faith in the engineers. You'd be surprised how "low" the
- peaks are on some of my CDs. But in general, I don't have to adjust very
- far in either direction switching between CDs. Certainly nowhere near as
- much as you would on vinyl.
-
- >if the processing is all done digitally, I suppose the loudest
- >bit can be found, and all the data scaled to fit on CDs, if the
- >digital processing uses more bits than the CD, or if the recording
- >is done at a relatively low level (although that would imply less
- >real dynamic range.)
-
- Yeah, that "loudest bit" thing makes perfect sense. I suppose that's
- what Marsha's CDP-297 is looking for when she pushes the "peak search"
- button, but it's not perfect (hey, what do you want from a $139 CD
- player?). The really short duration peaks (transients) don't take up
- enough bits to catch the player's attention sometimes, but if we're
- talking about taping to CrO2 w/Dolby, I don't think it's gonna result
- in audible distortion should you decide to trust the CDP-297's first
- impression of the peak. Especially if you do it on a tune-by-tune basis,
- as in while putting together a compilation tape.
-
- >of course the levels jump around - it is not a fixed level of output,
- >it is a fixed *maximum* level of output.
-
- Has to be thataway... there has to be a "largest number" you can write
- in that format. 16-bit? Who's the compunerd here?
- The one factor you leave out here, TTT, would be the frequency response
- of the tape deck *and* of the tape itself. A max bit at 50Hz versus a max
- bit at 1000Hz versus a max bit at 17,500Hz -- which one will likely peg
- the meters more? If you can say "all the same," you gots a nice tape
- deck! Still, the tape would know the difference.
-
- Jeff ("n.n.")
-
- --
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