Hi all,
This reminds of something I heard about when I was digging dirt while
choosing a mobo. I heard mention of AMR - Audio? Modem Raiser is it? am not
sure - in some motherboards based on the i810 which with firmware and sware
functioned as a modem - must be using a deviate of this idea. Not sure if its
in some way linked but I would'nt be surprised if it is.
Ashwin
sreangsu acharyya wrote:
> hi people,
>
> DISCLAIMER:
> i am not an electronics engineer, so please dont flame me if the
> following does not make sense.
>
> Thinking of ways to surf net for free, i thought of having a
> call-back system at my office. ( they will probably fire me if I actually
> do it...but no harm romanticising.)The 1st hurdle, is the office machine
> do not have a modem.
>
> I reasoned that, tone dialing is done by feeding "tones" into the
> receiver. Moreover these are certainly in our audible range 16-20k Hz,
> thus reproducible by the sound card.
>
> Thus given proper driver support wouldnt it be possible to use the line
> out of the sound card to dial some number. Upto this it seems ok, but
> what if i use the sound card as a modem. I sure can "hear" data packets on
> a connected line...but are all of them within our audible range or more
> precisely reproducible by the sound card.
>
> There are many issues however, getting the frequency right is ok, but
> the voltage output of the soundcard should be comparable to the one used
> on phone lines. About these values i have no idea.Moreover the speed would
> also be quite low if a sound card is used.
>
> The reasoning seems pretty elementary, and i am sure some one has
> thought about it. I searched linmodem.org and google.com/linux but couldnt
> get anything substantial.
> Please respond if you have any ideas.
> sreangsu
>
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