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How to determine which frequency band has highest magnitude

Question asked by JCB on Apr 21, 2014
Latest reply on Feb 18, 2017 by KJBob

Hi all.

 

I'm using ADAU1701 and SigmaStudio 3.10 beta.

 

I want to design a Index Selectable Filter to cut off the audio feedback from  different sources, eg: microphone, hoots and howls,  Different sources of feedback might contains different frequency and cause terrible sound overall.

I need to know the exact feedback frequency at that time, then only i can give the correct index to ISF to select which filter to apply.

 

The problem is how can i know from the signal at a time, which frequency has the highest magnitude?

 

For your info, the ISF (Index Seletcable Filter) accept only logic integer (0,1,2,3,4......)

 

I tried to read a few frequencies using General (2nd order) Filter and output linked into Envelope Peak.  Then, I compare all frequencies output to a Baisc DSP> Max, but this component 'Max" only compare and output the highest peak analog audio signal; not a valid input for ISF. 

 

 

sigmadsp.JPG

Thanks in advance.

JCB

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