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AIC3256evm - purepath

Hi

I am using AIC3256 evm to develop a voice operated switch which is based on filter the i/p signal to separate the signal as voice and noise and then compute voice energy , noise energy and compare them to decide whether voice is present or not.  While computing energy I require a feedback  path and I could not find any such component.  Help me to solve this problem.....

Can I create user programmable component , if yes how?

Thanking you

JAGDISH PATANGE