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signal-dependent mulitplexer switching with delayed release

Question asked by Robin on Aug 20, 2010
Latest reply on Aug 23, 2010 by BrettG

Dear all,

 

maybe someone has an idea how to solve the following problem (I am using the ADAU1446):

 

- I have two audio inputs, "A" and "B",  which are routed to an index selectable multiplexer

- the output of the multiplexer shall be input "A" if no signal on input "B" can be detected

- as soon as there's any signal detected on input "B", the output of the multiplexer shall switch to input "B".

 

so far so good - now the difficult issue:

 

-  the multiplexer output shall remain input "B" for at least 2 - 5 seconds after the last signal on input "B" has been detected.

 

Any idea how to realize that?  Anyone who can provide the schematic for that will make my day .-)

 

 

Thanks in advance


Regards,

Robin

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