Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ulysses.UUCP Path: utzoo!linus!gatech!ulysses!smb 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 Lines: 13 > 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.