Hi All,
There is a Bluetooth device, it with A2DP and HFP.
Put it in simple, A2DP is stereo audio, HFP is mono audio.
When the audio trace ( layout ) close to Bluetooth antenna, I can see the idle noise sometimes goes high abruptly ( test on HFP, mono), but the idle noise never goes high when using A2DP (stereo).
Whatever stereo or mono audio output pin are the same, they are:
L+, L-, R+,R-
For mono, both audio output the same wave.
but just can't understand, why mono audio sometimes will suffer abruptly idle noise....
Could you please advice ?
Thank you very much! Best regards, Boki.