You can use WAV files with these specifications:
- channels: mono
- sample rate: 8 kHz
- encoding: either 16 bit linear, 8 bit u-law, or a-law coding (.wav).
You can also use headerless audio files with 8 kHz, 8 bit u-law (.ul) or a-law (.al) encoding.
All of these formats can also be used for fetchaudio and transferaudio.
For more information, see <audio> in the Programmer's Reference Guide.
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