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ADV7627 Audio Sampling rate.

Question asked by Netstar77 on Mar 21, 2017
Latest reply on Jun 7, 2017 by JeyasudhaMuthuPerumal



We are working on the system that uses ADV7627 as HDMI switcher. Also, we do extract audio process it with audio codec, and then reinject it back to HDMI. Looks like most of it works pretty good, except one little issue. When sampling rate gets to higher modes, especially 192k our audio codec IC overclocks and starts to make lot of noise. This issue could be solved by detecting the change of the sampling rate and do configure codec accordingly. There is no way to do it on the codec IC, so we need to do it on ADV7827. I was trying to use new_samp_rt interrupt signal, but could not get consistent results. One more thing, we get 192k rate with HDMI signal that should not have any audio, and only if such signal connected at the power up time. Also, we could not see new_samp_rt int. signal, especially when system switches to this "NO audio" signal.


Any suggestions?