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Is it possible to Demodulate a Recorded Modem Stream via Software?

fshrkingfshrking Posts: 1Member
I have a strange request. I have some .Wav/.Aiff files of a 9600baud modem audio output (what's heard through the speaker). Is it possible to demodulate these into serial data internally (via Software) without running them back through a modem?

Do you know of any libraries or code that anyone has shared that is headed in this direction?

Thanks for any advice!

fshrking

Comments

  • ninchagoraninchagora Posts: 82Member
    [b][red]This message was edited by ninchagora at 2004-8-22 23:25:24[/red][/b][hr]
    [b][red]This message was edited by ninchagora at 2004-8-22 1:25:41[/red][/b][hr]
    : I have a strange request. I have some .Wav/.Aiff files of a 9600baud modem audio output (what's heard through the speaker). Is it possible to demodulate these into serial data internally (via Software) without running them back through a modem?
    :
    : Do you know of any libraries or code that anyone has shared that is headed in this direction?
    :
    : Thanks for any advice!
    :
    : fshrking
    :

    Do you know which modulation is used?
    (I think it is CCITT V.32 standard)

    I know now, it is 16-QAM.

    It would be possible to write a decoding routine, either by detecting specific amplitude/phase of the carrier, or by emulating the 16-QAM demodulator.

    Are you still interested in this?





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