Hi all:
I encountered a strange problem about audio capture.
I use the command arecord -f cd | aplay to test audio capture and display.
The input source is a notebook,The output source is a small speaker.
First I run the command arecord -f cd | aplay
Then I set the maximum display volume through amixer cset name="PCM Playback Volume" 100%
The display audio quality is well .
When I set the maximum capture volume through amixer cset name="PGA Capture Volume" 100%
The display audio quality is very noisy
So I set the capture volume to 50% through amixer cset name="PGA Capture Volume" 50%
The noise is reduced
Later,I also did a test that
I increased the volume of the input source but not increased the capture volume
The display audio quality is well
So I suspect there may be a problem tlv320aic32
