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From: steve@amdimage.UUCP (Steve eidson)
Newsgroups: net.audio
Subject: Re: CD digital filters-Eidson errs.
Message-ID: <515@amdimage.UUCP>
Date: Wed, 28-Aug-85 16:31:22 EDT
Article-I.D.: amdimage.515
Posted: Wed Aug 28 16:31:22 1985
Date-Received: Sun, 1-Sep-85 04:46:34 EDT
References: <493@amdimage.UUCP> <4213@alice.UUCP> <514@amdimage.UUCP>
Reply-To: steve@amdimage.UUCP (Steve eidson)
Organization: AMDIMAGE, Sunnyvale, CA
Lines: 27
Summary: 


	One other point I forgot to mention, it is possible 
to implement interpolation filters in shift-and-add architectures.
If the coefficients are kept simple, very high sample rate
filters can be implemented. The FIR interpolation filter
argued about previous has been implemented (by me at AMD)
in a shift-and-add architecture at a 128kHz sample rate.
We have also used more complex filters in the same architecture
at sub-multiples of this sample rate. 
	Unfortunately, many people have developed the notion
that they MUST have a multiplier to do digital signal processing,
when there are other alternatives for simple systems. Perhaps
none of the filters I have just mentioned would be adequate
for a CD player, I really haven't gone through the process of
designing an interpolation filter for CD's.
	In any case, I would be glad to discuss the details of the
interpolation filters I have talked about here with anyone.
Please send mail, I don't want to clog the net.

Thanks for your patience.
 ----------
 "...but you've got no arms and no legs,
 what are you going to do, bleed all over me ..."

 Steve Eidson (408) 749-2303
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