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Roman Zeyde
2014-07-06 08:14:09 +00:00
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@@ -7,7 +7,7 @@ The sender is modulating `data.send` binary file using `send.py` script into 32k
The receiver is using `arecord` Linux utility to record the audio file into `rx.int16` 32kHz audio file, which is demodulated by `recv.py` script into `data.recv` binary file.
The process requires a single manual calibration step - in order to find the maximal volume for the speaker, which will not saturate the microphone.
The modem's bitrate is currently 8kbps - so it should have no problem sending a simple transaction in O(second).
The modem's bitrate is currently 8kbps ([constellation diagram](http://i.imgur.com/JAbGkIt.png)) - so it should have no problem sending a simple transaction in O(second).
Moreover, I am sure it can be optimized by using better modulation, error correction and better audio equipment.
Currently, the documentation is quite lacking, but today was the first time I successfully transmitted 1KB of data between 2 PCs, so I am quite excited :)