[SGVLUG] analog (stored as PCM digital) to binary digital

[juanslayton at dslextreme.com]

What medium is it presently recorded on?
John

David Lawyer
> Heres a question someone sent me that I can't answer.  Anyone know of
> a computer program that does this?  Apparently he recorded analog data
> by tapping into a modem line and stored it digitally via pcm (pulse code
> modulation).  Now he wants to convert this digitally stored analog
> data back to digital, with the conversion back to digital being the
> demodulation of amplitude-phase modulation used by modems.
>
> So it should be possible to make this digital-analog-digital
> transformation without any analog step by doing a digital to digital
> conversion.  I guess this is what an ISP does via a remote access
> server (digital modem).  It coverts digital code from a T1 line (that
> originated from an analog modem) to the binary (hex) data sent by the
> modem.  So what he wants is a digital modem in software.
>
> 			David Lawyer
>
>    Hi Dave
>
>    I found your web document that explain many things about modem.
>
>    I would like to know if there is an easy way to decode a PCM file into
>    hex data.
>
>    I recorded a modem handshake + some data going thru the line(pcm file),
>    and now I would like to decode the file into HEX data.
>
>    I think I could do it by injecting the pcm file back into a modem to
>    get the data demodulated, but I'm not sure how to do it.
>
>    any advice.....
>
>    Regards
>