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From: smb@ulysses.UUCP (Steven Bellovin)
Newsgroups: net.audio
Subject: Re: cd players? (answers)
Message-ID: <1050@ulysses.UUCP>
Date: Fri, 16-Aug-85 15:57:59 EDT
Article-I.D.: ulysses.1050
Posted: Fri Aug 16 15:57:59 1985
Date-Received: Mon, 19-Aug-85 08:12:36 EDT
References: <226@geowhiz.UUCP> <4159@alice.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
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> 5.  Manufacturers:  Apparantly there are two designs used, Phillips and Sony,
>     which are manufactured by a limited number of companys.  These companys
>     products are then marketed under many names.  Could someone come up
>     with a semi-comprehensive cross-reference list of who makes what
>     machine behind the trim and which design they use?

I don't believe that the lead-in statement is correct.  Rather, initially
Sony went with analog filtering (see Andy Koenig's answers) and a 16-bit
DAC (digital-analog converter), whereas Philips -- the co-inventor with Sony
of the CD -- went with 4x oversampling, digital filtering, and a 14-bit DAC.
On the more recent Sony models, they've switched to 2x oversampling with a
16-bit DAC.  Why 14 vs 16 bits?  Cost, for the number of samples you're
feeding in per second.