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Article #16162Re: 4x Oversampling Compact Disc Specs........
From: C.M. Hicks
Date: Mon, 04 Jan 1993 20:41
Date: Mon, 04 Jan 1993 20:41
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christos@kuhub.cc.ukans.edu writes: >Hello there, > I have a question on compact disc specs. Does the 8x oversampling mean >8x8000 samples per second? Compact discs store two channels of audio data at 44.1 ksamples/second/channel. Most CD players use digital oversampling to increase the sample rate at the DAC, relaxing the requirement for a high-order analogue filter after the DAC. [ Long and often argued-about explanation of oversampling left out... ] In the example you quote (8x oversampling), the sample rate at the DAC will be 8 x 44100 = 352.8 ksamples/second/channel. Four times oversampling is most common because Philips produce a cheap chipset to do the job with virtually no glue logic. Christopher Hicks -- ============================================================================== Christopher Hicks | If it doesn't fit... cmh@uk.ac.cam.eng | ...you need a bigger hammer. ==============================================================================
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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!cam-eng!cmh From: cmh@eng.cam.ac.uk (C.M. Hicks) Newsgroups: sci.electronics Subject: Re: 4x Oversampling Compact Disc Specs........ Message-ID: <1993Jan4.204124.4848@eng.cam.ac.uk> Date: 4 Jan 93 20:41:24 GMT References: <1992Dec24.221506.45899@kuhub.cc.ukans.edu> Sender: cmh@eng.cam.ac.uk (C.M. Hicks) Organization: cam.eng Lines: 27 Nntp-Posting-Host: club.eng.cam.ac.uk