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Urgent: ADAU1442 serial audio input sensitivity and set up DC input entry for low level

Question asked by Semi_Tehrani on May 19, 2016
Latest reply on Jul 14, 2016 by DaveThib

Hi ,


I have added DC blocking cells to all of my serial audio ports inside Sigma studio project to be able to detect -96 dBFS and play audio  based on the marketing requirement.

The DSP input level detector detects this low level signal and passes it to two switches (main & priority). My DSP signal flow has fail over mechanism such as if the priority signal passes this low threshold the priority audio will play. I also have the fall back flow which if all the audio signal goes away analog 1 will play if it is connected ( mostly test features for installer)

at this time , I don't know how to figure out the value for the DC input entry to switch to the priority.

Attached is my DSP signal flow. DSP is receiving  4 different audio sources (I2S format) and based on the main and priority switches it will play that selected source. 

The current threshold is set for -64 dBFS.


Please, advise.