I am debating the best way to do this.
I am very limited on wires here, needing to do a stereo headset with microphone on a 3-pin jack. The system has a dsp processor in the headset and one interesting option is to send the digital data for the mike back to the central processor on a higher frequency, outside the audio range, that is too high a freq for the speaker to draw much current off of.
The audio is expected to be 128kbit/sec. I don't think I have resources available to compress it to a lower bandwidth. Any ideas if this could be transmitted this way, and what protocol or physical layer would work? I did note that since it's stereo there's 2 wires available to modulate it on, so differential transmission is an option.
Maybe it's a simpler option to just bump up the frequency of the mike signal and send it back in analog.... there are some reasons I don't feel too good about this option though.