From: Watson 'Atto Parsec' Name
Subject: Re: Single / Multitone Detector (Not DTMF)
X-Newsreader: MicroPlanet Gravity v2.60
Date: Sun, 12 Jan 2003 21:48:02 -0800
NNTP-Posting-Date: Sun, 12 Jan 2003 22:48:50 PST
Organization: InReach Internet
In article ,
> IsThere a audio tone detector type IC that is NOT just
> standard DTMF, but with similar capability? Ideally
> it would integrate some configureable digital filters
> with configurable detectors and logic to enable
> single or multitone detection of arbitrary signals.
> And be run from a microcontroller, of course.
> I would like to be able to detect some non-dtmf
> signals from handheld radios, as well as a couple
> or more DTMF tones.
> Any pointers appreciated...
The usual chip to do this is the 567 aka NE567 or LM567. The data sheet
had a circuit for implementing a DTMF decoder, but you can modify it to
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