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Article #411Re: oversampling
From: Jonathan Flamm
Date: Wed, 27 Sep 1989 03:27
Date: Wed, 27 Sep 1989 03:27
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1147 bytes
In article <1122@rex.cs.tulane.edu> hoang@rex.UUCP (Dzung Hoang) writes: > My DSP professor discussed CD oversampling and his explanation was >different from the above in the details. Oversampling does not directly >interpolate the sample values to 47 47.25 47.5, etc. Instead, 0's are >inserted as appropriate between samples. The LPF takes care of recovering >the signal. There is no distortion at all. > >Dzung Hoang Actually zeroes are inserted but interpolation is performed using a digital filter -- hence the jargon "digital filtering" so prevelant on CD players. The LPF is done (as usual) in the analog domain and can be accomplished with a much shallower, more linear filter. At least this is what I believed to be true. Jonathan Flamm jef@apple.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!apple!jef From: jef@Apple.COM (Jonathan Flamm) Newsgroups: comp.dsp Subject: Re: oversampling Message-ID: <35056@apple.Apple.COM> Date: 27 Sep 89 03:27:33 GMT References: <1122@rex.cs.tulane.edu> Distribution: usa Organization: Apple Computer Inc, Cupertino, CA Lines: 16