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uart-audio
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Audio out with an FTDI UART cable
Download README (.md)
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README.md
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uart-audio
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# Audio out with an FTDI UART cable This encodes audio as either PDM (using a first order sigma-delta stage), 32-bits PWM or 64-bits PWM and sends it as binary data to a UART including standard start and stopbits. This probably works with many UART cables, not just FTDI. The program requires raw audio samples in a suitable samplerate to work. The sample rate is calculated like this: `baudrate / 10 * 8 / output_bits_per_sample` For PDM and 64-bits PWM, this gives: `baudrate / 10 * 8 / 64` Example: 3MBaud = 3000000 / 10 * 8 / 64 = 37500 For 32-bits PWM: `baudrate / 10 * 8 / 32` The following prepares a .wav file into a suitable raw file to be used at 3MBaud in PDM mode. ``` sox input.wav --bits 16 --channels 1 --encoding signed-integer --rate 37500 output.raw make uart-sound && ./uart-sound output.raw /dev/ttyUSB0 3000000 0 ```
