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'[OT] Mic to MT8870 in'
1999\11\13@004034 by netquake

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Hi!

I've seen a couple of posts about Mitel's MT8870 and
I would like to know if I can get it to recognize DTMF tones
using a MIC on chip input or these chips can only be interfaced
to the phone line.

Thanks!
------------------------------------
netQ <spam_OUTnetquakeTakeThisOuTspaminnocent.com>
http://virtuaweb.com/picprog
"Home of amateur PIC programmers..."

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1999\11\13@005316 by Paul B Webster

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German wrote:

> I've seen a couple of posts about Mitel's MT8870 and
> I would like to know if I can get it to recognize DTMF tones
> using a MIC on chip input

 You bet you can!  You will need some gain between the microphone and
the 8870 to bring the signal level up to "scratch", a couple of hundred
millivolts P-P IIRC.

> or these chips can only be interfaced to the phone line.

 Well, interfacing to a phone line is just interfacing to a remote
microphone...  And remember those acoustically-coupled diallers
available for non-touch-tone phones?  Hmmm, well if you live in a
country that has had T-T for a very long time, maybe you don't.  ;-)

 Hmmm.  What are you going to do with it?
--
 Cheers,
       Paul B.   (visiting daughter for a day or so)

1999\11\13@080645 by Dr. Imre Bartfai

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Hi,
of course it is possible after some amplification because of the chip is
sensitive (about 100mV or so).

Regards,
Imre

On Sat, 13 Nov 1999, German wrote:

{Quote hidden}

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