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How to eliminate feedback in Sigma DSP ADAU1452

HI everyone

I have the same problem with our DSP is ADAU1452.There are some tool and function.ADAU1452 don't have.

I am using directional microphone and speaker to achieve a simple aduio function,but I have a problem is microphone receive the sound from will produce a whistle kind of sound.

I have try NLMS fillter to sovle,but its result isn't obvious.

Please help me

to resolve this problem.

thank you.

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