I use the adv7511 as a HDMI source.
The audio input to the adv7511 is spdif and it could be selected 'LPCM' or 'Bitsream'.
When the 'Bitstream' is selected ,we cut off the spdif to adv7511 to mute the aduio.
When the 'LPCM' is selected,the spdif is sent to adv7511 normally.
But when we change the audio to 'LPCM' from 'Bitstream',we can get a high frequency noise before the music play.
Could you give me some advices for this problem?