Re: acoustic modems and cellular phones

"Dave" <davidclark@xxxxxxxx> wrote in message
news:1115003453.571939.305620@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I thought about wiring in some type of amplifier but I wanted to ask
> here first. Has anyone got experience with cell phones and acoustic
> modems?

No, but you realize that you'll be lucky to get even a 2400bps modem to work
with such a method, right? The CoDecs in cell phones assume they're taking
human voice input and being heard by a human ear, and there's lots of
"psychoacoustic" compression that throws out lots of audio information that
humans can (pretty much) do without but that a typical modem absolutely needs
to maintain its data transfer model.

> What would be a good amplifier to use to bring the cell phone
> hands free output up to adequate volumes?

Mmm... LM386?

---Joel Kolstad


.

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