I'm looking at sending some extremely low speed data under audio to
identify the audio. The receiver would be an Android device with internal
microphone. I'm thinking of using direct sequence spread spectrum with the
level being substantially below the audio so it would appear to be very
low level noise. But, my experience with spread spectrum is extremely
limited. I'd appreciate any pointers to information on it, especially at
audio frequencies, and any open source projects on it.

THANKS!

Harold



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