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Article #1825Re: Prefilter type for downsampling
From: Jim Isom
Date: Mon, 23 Nov 1992 19:58
Date: Mon, 23 Nov 1992 19:58
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1270 bytes
In <By17CC.J2F@news.cso.uiuc.edu> ja51359@uxa.cso.uiuc.edu (axelrod) writes:
+If I want to lower a sample's sampling rate, what kind of filter should I use?
Consider the McClellan-Parks algorithm for optimal FIR design. You can find
implementations in a lot of packages, including the original from (I think)
1973 in the IEEE transactions. Else, Matlab's Signal Processing Toolbox has
one, albeit with less information concerning the filter returned than in the
original.
+Is there a conventional digital filter design for this purpose specifically?
+It's an audio signal. How important is keeping phase linear in audio filters?
Important enough to warrant a linear-phase filter for
down-sampling.
+Thanks
+Jeff
--
Jim Isom jimi@well.sf.ca.us | 2b+~2b=1
'92 R100GS (Unnamed as yet), GSXR-750M (Nefertiti), '86 Radian (Minerva)
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Newsgroups: comp.dsp Path: arc1-ca.pugleaf.net!sparky!uunet!well!well.sf.ca.us!jimi From: jimi@well.sf.ca.us (Jim Isom) Subject: Re: Prefilter type for downsampling Message-ID: <jimi.722548713@well.sf.ca.us> Sender: news@well.sf.ca.us Organization: Whole Earth 'Lectronic Link References: <By17CC.J2F@news.cso.uiuc.edu> Date: Mon, 23 Nov 1992 19:58:33 GMT Lines: 24