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From: martin@entropy.ms.washington.edu (Don Martin)
Newsgroups: sci.math,comp.sources.wanted,comp.lang.pascal
Subject: Re: Freq. of sampled waveform.
Message-ID: <821@entropy.ms.washington.edu>
Date: 22 Mar 88 06:47:57 GMT
References: <452@sniff.dec.com>
Distribution: na
Organization: UW MathStat, Seattle
Lines: 15
Keywords: frequency,sample,A/D
Summary: Digital tone recognition


Here are a few suggestions.

An FFT based spectral analysis is  probably overkill.

If the tones frequecies are stable and accurate, a simple
correlation of a half dozen or so cycles with a reference 
will do for sine waves. ( use sin/cosine pairs and correlate
both ) This will depend on noise levels too.

For digital filter software in FORTRAN ( ugh ) see the IEEE
book on signal processing software. It has filter design
programs.

Don Martin