>>
I would like to inject data into a line level audio signal and recover it at
the other end, of course you do not want to hear it and I am also limited by
bandwidth of 20-20k, as this audio channel does get wirelessly transmitted.
I may have some headroom and be able to put it at say 30K, what would be the
best encoder/decoder pair?

Datarate required 19200bps
<<

So, you are trying to tranmit a 19200bps digital stream over a 10KHz
channel.  This is theoretically possible if the 10KHz channel has sufficient
signal to noise ratio.  However, this will be quite tricky to do yourself
even if the signal to noise ratio is good enough.


*****************************************************************
Olin Lathrop, embedded systems consultant in Devens Massachusetts
(978) 772-3129, olin@embedinc.com, http://www.embedinc.com

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