Android-Nougat-imx6q android low volume playback noise issue

[ravikiranjj]

Hi All,

I am working on the imx6q based customized board with 16K (MAX) sampling rate audio codec, Nougat porting.

I know the android top volume is controlled by software.

But i am facing one issue, regarding Android low volume playback is producing some noise along with audio.

Noise is increasing as android volume decreases...

If i use native tool tinyplay for playback of .wav files and volume controlled by tinymix with Volume control register is not producing any noise...along with audio.

Noise is there only with android playback of Music files or Video files.

Is resampling in HAL audio data to 16K sampling rate,  producing additional noise along with the audio ?

Or what may be the reason and how to solve this issue?

Regards,

Ravikiran J J

[ravikiranjj · Accepted solution]

Reduced that additional noise by changing the volume gain range in default_volume_tables.xml file.

DEFAULT_MEDIA_VOLUME_CURVE volume range changed, noise along with the audio significantly reduced.

Regards,

Ravikiran J J

[diegoadrian]

Hello,

How are you reproducing the Audio file.I need the steps to reproduce your error.

Best Regards,

Diego.