We are using ADV7850 to switch between VGA with audio and HDMI. During the transition, there is a noisy sound at the receiver end.
I have tried to solve this problem by the following methods:
Option 1 : mute_audio - Section 7.31.1 data sheet of ADV7850
Setting mute_audio, Addr 68 (HDMI), Address 0x1A  and
HDMI( 0x68 ) Reg 0x1A  to Prevent auto unmute
But this doesn't work.
Option 2 : avmute - Section 13.4 datasheet
clear_avmute: Addr B8 (Main), Address 0x4B, bit 7.
set_avmute: Addr B8 (Main), Address 0x4B, bit 6.
This method also doesn't work.
What am I missing here?