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From: motcid!segal@uunet.uu.net (Gary Segal)
Newsgroups: comp.dcom.telecom
Subject: Re: DTMF Decoder Wanted (or Chips/Schematics)
Message-ID: <14327@accuvax.nwu.edu>
Date: 4 Nov 90 20:32:28 GMT
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mitel!spock!meier@uunet.uu.net (Rolf Meier) writes:

>In article <14220@accuvax.nwu.edu> Steve Willoughby writes:

>>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.

Before this turns into a shouting match by all of the people that make
DTMF decoders, please note that Mitel is not the only company that
makes them.  Of course, I'd like to see you use the Motorola chip
(MC145436), but it sounds like your best bet is to go to your local
Radio Shack and buy whatever manufacturer happens to be in the bubble
pack.


Gary Segal	...!uunet!motcid!segal		+1-708-632-2354
Motorola INC., 1501 W. Shure Drive, Arlington Heights IL, 60004
The opinions expressed above are those of the author, and do not consititue
the opinions of Motorola INC.