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Can distinguish between real audio signal or suddenly noise by ADAU1451?

Question asked by Sam.S on Jul 27, 2016
Latest reply on Sep 28, 2016 by DaveThib

Dear Sir,


Our customer met a problem, that is :


They use signal detection block to detect line-in music. When detect signal for 2 seconds and volume >= -48dBFS, they change source from Bluetooth to line-in.


But the “Signal Detection” have a bug. Although trig time is 2s, it only operate with “active to de-active” status, but do not impact “de-active to active” condition.


The result is, a suddenly noise will trigger signal detect, and let speaker change source to line-in.


They do not plan to debounce signal on MCU, and expect ADAU1451 to do it.

Is there any way to resolve this issue? For example,

- Any other block to debounce signal with “de-active to active” condition.

- Any other block to output a average volume, then compare with “DV value -46dBFS”.

- Any other solution?


They try below solution, a sample of ADAU1451 block is on attachment, please see red cycle:


TYM_F2_Active Detect function_issue.png

Would you please kindly provide any advised for this issue.


Thank you very much!