Hello...
sreangsu acharyya wrote:
>
> There are many issues however, getting the frequency right is ok,
In my BE project we generated tones out of dialer IC but microcontroller timers
with RC low pass filter works fine..
> but
> the voltage output of the soundcard should be comparable to the one used
> on phone lines.
The biggest issue I can imagine. Telephone lines send a 75V AC on -48V DC for
ringing. Thanks to ringer fones. Otherwise all digital fones work on 12V supply.
further you will need a transceiver which will lokk after the line status change
and detecting frames etc. Doing it on sound card is beyond my imagination....
Disclaimer. I am certified as Electronics and telecommunications engineer by
Pune University and I want to believe that. Though often I don't... :-))
Bye
Shridhar
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