Path: utzoo!utgpu!watserv1!watmath!att!att!linac!uwm.edu!bionet!hayes.ims.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request
From: mitel!spock!meier@uunet.uu.net (Rolf Meier)
Newsgroups: comp.dcom.telecom
Subject: Re: DTMF Decoder Wanted (or Chips/Schematics)
Message-ID: <14288@accuvax.nwu.edu>
Date: 2 Nov 90 14:07:34 GMT
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Reply-To: Rolf Meier <mitel!healey!meier@uunet.uu.net>
Organization: Mitel. Kanata (Ontario). Canada.
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X-Telecom-Digest: Volume 10, Issue 787, Message 4 of 12


In article <14220@accuvax.nwu.edu> Steve Willoughby <aardvark!
steve@tessi.uucp> writes:
X-Telecom-Digest: Volume 10, Issue 780, Message 5 of 13

>I'm playing around with building a circuit that will, among other
>things, (try to) recognize DTMF tones played into it.  An example
>application of this would be to make your own voice-mail system (the
>circuit would look for DTMF keypad keys pressed on the incoming line
>and signal a CPU to do something, like play or record a message.)

Mitel Semiconductor has an integrated DTMF receiver chip, MT8870.
This should do the trick.

In North America, call 1-800-267-6244.  In Portland, try Time
Electronics, (503) 684-3780.


Rolf Meier    Mitel Corporation