Optica D122 Menu Tree page 61

Bit Rate
Selectable audio transmission bit rate include 16 kbps (G.726), 24 kbps (G.726),
32 kbps (G.726), 40 kbps (G.726), uLAW (G.711) and ALAW (G.711). Both uLAW
and ALAW signify 64 kbps but in different compression formats. Higher bit rate
will let higher audio quality and require bigger bandwidth. Click on <Save> to
confirm the setting.
Recording to Storage
Select <Enable> from the drop-down menu to enable recording audio with video
into SD card.
NOTE: If the chosen bit rate is not compatible with the player, there will
only be noise instead of audio during playback.
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