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Article #10424Re: A question about the Nyquist theorm (CD sampling/filtering)
From: Jim Roth
Date: Sat, 02 Mar 1991 14:56
Date: Sat, 02 Mar 1991 14:56
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In article <1991Mar1.191955@maximo.enet.dec.com>, ajf@maximo.enet.dec.com (Adam J Felson) writes... >In article <17510@milton.u.washington.edu>, whit@milton.u.washington.edu (John >> ...other stuff deleted... >The first CD players did NOT have oversampling. They ran @ 44.1 KHZ with a >pretty >steep 20KHZ analog filter. This is false. The first players were from Sony and Phillips. The Sony DAC's ran at Nyquist rate with analog lowpass filters. The Phillips used 4x oversampling and noise shaping with a 14 bit DAC, followed by a rather gentle 3rd order Bessel filter. The oversampling FIR filter included compensation for the slight rolloff of the Bessel filter. See the Phillips technical journal that appeared about that time. - Jim
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!decwrl!pa.dec.com!hollie.rdg.dec.com!ryn.mro4.dec.com!allvax.enet.dec.com!jroth From: jroth@allvax.enet.dec.com (Jim Roth) Newsgroups: sci.electronics,comp.dsp Subject: Re: A question about the Nyquist theorm (CD sampling/filtering) Message-ID: <4063@ryn.mro4.dec.com> Date: 2 Mar 91 14:56:21 GMT Sender: guest@ryn.mro4.dec.com Followup-To: sci.electronics Organization: Digital Equipment Corporation Lines: 20