User's Manual

Table Of Contents
AI7688H User Manual
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Copyright@2016 AcSiP
11 Audio Playback and Recording
AI7688H has an I2S interface for audio playback and recording. You'll need an audio DAC to convert
I2S to analog sound data.
Note: the recording function is only supported with firmware v0.9.3 and above.
Audio Playback
MP3 playback
To play a MP3 file, use madplay:
WAV playback
To play a WAV file, use aplay as below:
Audio recording
WAV recording
Note: for a high bit-rate WAV recording (like 16bit/44.1k format as the below example), please record
the file to a destination with high I/O speed (e.g. USB drive, SD card, or RAM) instead of the
on-board flash. Due to the low writing speed of the on-board flash, users will experience sound
jittering and buffer overrun if the recorded file is written to the on-board flash.
To record an audio file, use arecord as below: