Send files via microphone and speakers.

Program sends digital data via analogue signal. Uses a technique called Phase Shift Keying.

1. Attach the microphone on the receiving end to the speakers on the transmitting end. You may connect jack/jack cable to avoid data transfer via air.
2. Run "receive.py" at receiving computer.
3. Run "send.py" at second computer.
4. Wait for ending "send.py".
5. Stop "receive.py".
6. File transmited!