Hi all,

Audio modem library v1.0 is ready!
I've moved it to GitHub, under https://github.com/romanz/amodem.

The README file (https://github.com/romanz/amodem/blob/master/README.md) is now more detailed, and contains calibration and usage demos.
There are even screencasts for the demos:

• calibration: http://youtu.be/iCg1tepGz10
• usage: http://youtu.be/94yS3IZmtho

The data from my test is at: https://www.dropbox.com/sh/2yai1xmntdqlwf1/AACvfzasKEHK0zVxdzI4jF7pa

A few more details about the version:
The modem is using OFDM over an audio cable with the following parameters:

    Sampling rate: 32 kHz
    BAUD rate: 1 kHz
    Symbol modulation: 64-QAM
    Carriers: (1,2,3,4,5,6,7,8) kHz

This way, modem achieves 6[bit/symbol]*8[symbol/baud]*1000[baud] = 48kpbs bitrate = 6.0 kB/s.
A simple framing with Reed-Solomon ECC is used, with (255,245) rate = ~4% overhead.
(it should take a bit less than 3 minutes for 1MB to be transmitted)

I would be happy if more people will try and test this library.
Questions, remarks and suggestions are welcome!