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From: mpm@hpfcms.UUCP (mpm)
Newsgroups: net.audio
Subject: Re: Carver CD Player & Technology
Message-ID: <14700013@hpfcms.UUCP>
Date: Mon, 18-Mar-85 21:47:00 EST
Article-I.D.: hpfcms.14700013
Posted: Mon Mar 18 21:47:00 1985
Date-Received: Thu, 28-Mar-85 00:06:57 EST
References: <14700008@hpfcms.UUCP>
Organization: Hewlett-Packard - Fort Collins, CO
Lines: 37
Nf-ID: #R:hpfcms:14700008:hpfcms:14700013:000:1506
Nf-From: hpfcms!mpm    Mar 20 18:47:00 1985


     I found another article (somewhere, I don't remember where) about
the Carver player.  Apparently it uses 2x oversampling (not 4x), but
has 16-bit DACs.

     I think Sherwood also uses 2x oversampling.  Why stop there?

		-- Mike "in the interests of audio education" McCarthy
		   (hpfcla!hpfcms!) mpm

P.S.  After two years on the market, there is still a lot of confusion
and misunderstanding of this technology.  I now look with skepticism on
advertising claims (even statements from trade journalists) about CD
players.

      Watch out for the following:

      - misrepresentation of sampling rate
      
	Multiplexing a single DAC admittedly gives a real sampling
	rate of 88.2 KHz for both channels, but the standard 44.1
	KHz rate for each channel.  This is NOT the same thing as
	2x oversampling.  Obvious to us perhaps, but what about
	the typical consumer?
      
      - confusion between error correction and digital filtering
      
	As far as I know, ALL players have ECC.  (The Sony/Phillips
	CD standard calls for the redundant info on the media.  I
	guess there'e no guarantee a player will use it.  [Maybe
	that's what was wrong with the old Sears deck.])  Only a
	few (more expensive) players have nifty digital filtering -
	often in conjunction with oversampling.

       Add these to other areas of confusion:  the difference between
mastering and digital recording, frequency response versus sampling
rate, indexing, tracks versus bands, etc.  (This is getting complicated.)