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Article #316Re: Designing the analog filter adendum
From: Tom Anderson
Date: Thu, 28 Sep 1989 21:03
Date: Thu, 28 Sep 1989 21:03
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> However, we do have a phase problem. My Chebychev design has a > phase lag of 180 degrees at 20kHz. The phase starts taking off > at about 2kHz. This is no big deal for me, as I am dealing with > yucky movie and TV signals, but for those hi-fi nuts who buy > expensive cable and interconnects, this is bloody murder... Can't you fix up the phase of the analog anti-aliasing filter with a digital filter that has flat frequency response and the opposite phase of the analog filter? For that matter, maybe you could fix up the amplitude flatness at the same time. Tom Anderson toma@hpsad.hp.com "Its only hardware" Hewlett-Packard Opinions expressed are my own and not Hewlett-Packard's.
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!swrinde!ucsd!ucbvax!hplabs!hpl-opus!hpnmdla!hpsad!tomaReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!swrinde!ucsd!ucbvax!hplabs!hpl-opus!hpnmdla!hpsad!toma From: toma@hpsad.HP.COM (Tom Anderson) Newsgroups: comp.dsp Subject: Re: Designing the analog filter adendum Message-ID: <9520004@hpsad.HP.COM> Date: 28 Sep 89 21:03:19 GMT References: <1989Sep27.030845.2927@ivucsb.sba.ca.us> Organization: HP Signal Analysis Division - Rohnert Park, CA Lines: 15