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From: charlie@oakhill.UUCP (Charlie Thompson)
Newsgroups: rec.audio,sci.electronics
Subject: FIR filters
Message-ID: <1025@oakhill.UUCP>
Date: Tue, 27-Oct-87 22:59:49 EST
Article-I.D.: oakhill.1025
Posted: Tue Oct 27 22:59:49 1987
Date-Received: Sat, 31-Oct-87 02:58:39 EST
Organization: Motorola Inc. Austin, Tx
Lines: 23
Keywords: DSP
Xref: mnetor rec.audio:4021 sci.electronics:1642

This is a question for DSP jocks on the net......


I am designing a really sharp FIR filter for digital audio.
The purpose of the filter is to prevent aliasing for a sample rate
of 44.1 KHz.  For 16 bits I need to be -96 dB at 22.05 KHz.  I would
like the passband to be 20.0 KHz.  My question is this....

Which FIR design technique should work best???

   a) Kaiser Window and Remez Exchange Algorithm

   b) Equi-ripple iterative approach.

Dropping 96 dB in only 10% of the bandwidth is a REALLY sharp filter!
It would also be nice to have less than .01 dB of passband ripple.
I have a hunch as to which one works the best but I'd like to hear
some opinions from someone else.

Thanks.

Charlie Thompson
Austin,TX