> I need to store digital data on an audio soundtrack. Source data rate
> is not higher than 4800 bps, bandwidth of audio soundtrack is 32 KHz.

You have ample 'room' between the baudrate and the audio bandwidth, so a
simple FSK modulation should do. IIRC 1200 baud tape (casette) recording
used to be common, scale the frequencies up by a factor 4 and try that. 

Wouter van Ooijen

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