Xref: utzoo sci.electronics:18131 comp.dsp:1324 Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!decwrl!pa.dec.com!decabo.enet.dec.com!maximo.enet.dec.com!ajf From: ajf@maximo.enet.dec.com (Adam J Felson) Newsgroups: sci.electronics,comp.dsp Subject: Re: A question about the Nyquist theorm (CD sampling/filtering) Message-ID: <1991Mar1.191955@maximo.enet.dec.com> Date: 2 Mar 91 02:19:55 GMT References: <17510@milton.u.washington.edu> <11515@pasteur.Berkeley.EDU> <1991Mar1.004711.15100@watcgl.waterloo.edu> Sender: news@decabo.enet.dec.com Reply-To: ajf@maximo.enet.dec.com (Adam J Felson) Followup-To: sci.electronics Organization: Digital Equipment Corporation Lines: 25 In article <17510@milton.u.washington.edu>, whit@milton.u.washington.edu (John Whitmore) writes: ::In article <1991Mar1.004711.15100@watcgl.waterloo.edu> cjwein@watcgl.waterloo.edu (Chris J. Wein) writes: ::>In article wilf@sce.carleton.ca (Wilf Leblanc) writes: ::>>jbuck@galileo.berkeley.edu (Joe Buck) writes: :: ::>>>Example of CD salespeak: pushing oversampling as an advanced technical ::>>>feature. Oversampling is simply inserting zeros ... ::>>>Still, some sales critters think it's an advanced technical extra. :: :: It isn't, mainly because it's NOT an extra. All CD players ::oversample, and use a FIR filter (i.e. digital filtering). The ::cheapest, oldest ones use 2x oversampling, and don't advertise the ::'feature'. :: The first CD players did NOT have oversampling. They ran @ 44.1 KHZ with a pretty steep 20KHZ analog filter. __a__d__a__m__