User manual for NV-711, NV-711-Wac 40
8.1.5.1
Additional sound settings → Digital sound
PCM
— use the built-in decoder. LPCM-audio is decoded by an internal decoder.
HDMI RAW
— audio is decoded by an external decoder, audio receiver, or TV.
Auto
— automated detection of supported audio codecs. If an external device
supports decoding of an audio codec (DTS, AC3, etc.), RAW mode will be used,
otherwise — PCM.