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From: vail@tegra.COM (Johnathan Vail)
Newsgroups: sci.electronics
Subject: Re: Need info on DTMF decoder chips.
Message-ID: <1930@atlas.tegra.COM>
Date: 15 Jan 91 23:11:52 GMT
References: <1991Jan6.213544.5386@techbook.com> <80276@sgi.sgi.com>
Distribution: usa
Organization: Tegra-Varityper, Inc., Billerica, MA
Lines: 32
In-reply-to: rpw3@rigden.wpd.sgi.com's message of 8 Jan 91 10:33:20 GMT

In article <80276@sgi.sgi.com> rpw3@rigden.wpd.sgi.com (Rob Warnock) writes:

   In article <1991Jan6.213544.5386@techbook.com> tedpan@techbook.com
   (Teddy Panarto) writes:
   +---------------
   | I've been looking for a DTMF decoder chip, NOT the chips that generate
   | DTMF tone, but the ones that decode the tones to binary (for example) output.
   | One that I know of is M-956, made by Teltone, but I have no luck on finding
   | the company. Signetics also makes them, I believe. I live in Portland,
   | Oregon, so if anyone can help me on where to find such chips, I'd be very
   | grateful. It really doesn't matter what company makes the chips, as long as
   | it's a DTMF decoder with (preferrably) binary output.
   +---------------

   Believe it or not, try your local Radio-Shack. They stock the Silicon Systems
   SSI-102 (?) which is exactly what you're asking for. (I could be off a bit on
   the part number.)

These are pretty good chips.  I have had some experience with them.
One suggestion is to get the ap-notes from SSI and add their
pre-filter.  That allows it to pick tones "out of the mud" or so I am
told.

Hope this helps, jv



"A screaming comes across the sky"
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|     | Johnathan Vail | n1dxg@tegra.com
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