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From: paulr@syma.sussex.ac.uk (Paul T Russell)
Newsgroups: comp.sys.mac.comm,comp.sys.mac.hypercard,comp.sys.mac.wanted
Subject: Re: DTMF tone recog. by Mac?
Message-ID: <4004@syma.sussex.ac.uk>
Date: 11 Dec 90 11:25:48 GMT
References: <1990Dec6.153124.840@hfnet.bt.co.uk>
Organization: University of Sussex
Lines: 28

From article <1990Dec6.153124.840@hfnet.bt.co.uk>, by matyeo@hfnet.bt.co.uk (Mike Atyeo):
> does anyone know of any XCMND or Mac add-on that allows it to understand
> DTMF tones? (DTMF tones are the tones made by some phones when ringing
> a number) I want to translate the tones to their corresponding numbers
> for use in a Hypercard/Comms stack.

Depends on your budget ;-)

I would use an AudioMedia board from DigiDesign (16 bit stereo A-D
and D-A with a DSP 56001 processor) and the 'DSP Designer' package
from Zola technologies. This would let you design a set of filters
which you could run on the AudioMedia in real-time, and which would
make DTMF decoding a breeze. I doubt that you could do this with
a MacRecorder or the built-in sound hardware on the new Macs
(not in real-time, anyway, but I'd be happy to be proved wrong).

//Paul

PS. If you're happier building hardware than writing software then
    it's pretty easy to combine a DTMF decoder chip set with a
    UART to give you DTMF -> RS-232 which you can then read via
    the Mac serial port.

-- 
           Paul Russell, Department of Experimental Psychology
         University of Sussex, Falmer, Brighton BN1 9QG, England
     Janet: paulr@uk.ac.sussex.syma  Nsfnet: paulr@syma.sussex.ac.uk
    Bitnet: paulr%sussex.syma@ukacrl.bitnet  Usenet: ...ukc!syma!paulr