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ADV7850 generate noisy pop sound when changing between VGA with Audio to HDMI

Question asked by kurian@dct on Dec 21, 2015
Latest reply on Jan 8, 2016 by JeyasudhaMuthuPerumal

Hi Guys,


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 [4]  and

                 HDMI( 0x68 ) Reg 0x1A [0] 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?