On the NWDigital PiDV DTXEN is pulled low. I don't know if I have
the schematic on the DV3000u. I ASSUME it's the same state.
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On 8/28/2017 11:46 AM, Matthew 2E0SIP
Cheers Steve, that's very helpful.
It looks like the DVMEGA AMBE3000 can generate AMBE comfort
noise packets if it's not receiving any audio, I wonder if
that's what's going on here-
I will drop Guus a message and see if he has any thoughts.
The Voice Activity Detection (VAD) algorithm along with the
Comfort Noise Insertion (CNI) feature of the AMBE-3000™
Vocoder Chip performs useful functions in systems trying to
convert periods of silence, that exist in normal conversation,
to savings in system bandwidth or power. VAD and CNI can be
enabled by either hardware configuration pin (DTX_ENABLE TQFP
pin5 BGA pin C1) or as part of a control packet.