6.2 Test 2: Testing the SPDIF Transmitter using ALSA and a USB Audio Extender

The SPDIF transmitter converts the audio signal from the source (.wav file) internal format (which can be PCM or compressed audio) into a format suitable for SPDIF transmission.

In this test, the audio file (.wav file) is transmitted through the SPDIF TX peripheral on the board. It is received as an SPDIF input on the USB audio extender and can be heard through headphones connected to the USB audio extender.