[conandrum]

I just bought an Android 13 car head unit and I connected a USB DAC to one of its USB ports.
All audio goes out the USB DAC except for phone calls and AV-IN audio (from my externally connected TV tuner via phono plugs yellow/red/white).
(phonecalls are conducted by connecting my phone to the head unit via BT)

I am using adb to investigate why this is happening.
I tried 'adb shell dumpsys media.audio_policy' for example.
I tried 'adb shell dumpsys media.audio_flinger' for example (while making a BT phone call).
(Click the links to download the txt files, since I cannnot attach them here.)

I can see the Cyrus Soundkey in the policy output.
Is it possible that the Soundkey is not being used due to an incompatibility with the telephony audio (24bit vs 16bit)?
Can you see anything obvious in the text files?

Would you like me to try something else?

 

[conandrum]

I managed to attach the files.

 

[HiFiWar]

I just bought an Android 13 car head unit and I connected a USB DAC to one of its USB ports.
All audio goes out the USB DAC except for phone calls and AV-IN audio (from my externally connected TV tuner via phono plugs yellow/red/white).
(phonecalls are conducted by connecting my phone to the head unit via BT)

I am using adb to investigate why this is happening.
I tried 'adb shell dumpsys media.audio_policy' for example.
I tried 'adb shell dumpsys media.audio_flinger' for example (while making a BT phone call).
(Click the links to download the txt files, since I cannnot attach them here.)

I can see the Cyrus Soundkey in the policy output.
Is it possible that the Soundkey is not being used due to an incompatibility with the telephony audio (24bit vs 16bit)?
Can you see anything obvious in the text files?

Would you like me to try something else?

I recommend contacting the company that makes the DAC or the head unit.

 

[Roseval]

phonecalls are conducted by connecting my phone to the head unit via BT

Just a wild guess. The moment you make a phone call, BT uses the HSP (Headset profile) instead of A2DP (High quality stereo). HSP not only needs a DAC but a Mic as well. Maybe because of this the USB DAC is not used as it is a DAC only, not a ADC+DAC?