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Alex Rivera
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I have a stream of binary data and want to convert it to raw waveform sound data, which I can send to the speakers. This is what the old-school modems did in order to transfer binary data over the phone line (producing the typical modemish sound). It is called modulation. Then I need a reverse process - from the raw waveform samples, I want to obtain the exact binary data. This is called demodulation. Any bitrate will work for a start. The sound is played using computer speakers and sampled using a microphone. Bandwidth would be quite low (low quality microphone). There is some background noise but not much. I found one particular way to do this - Frequency shift keying . The problem is I can't find any source code. Can you please point me to an implementation of FSK in any language? Or offer any alternative encoding binary<->sound with available source code?
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