adau1701 and larsen effect

Feedback is a very complicated issue and it is hard to solve with the limited processing power of the SigmaDSP. We do not have any algorithms available specifically designed to eliminate feedback. One way to attempt a solution would be to induce feedback in your system and measure the fundamental frequency that causes the most feedback power. Typically there are characteristic frequencies for a given system that can be identified as "problem frequencies". Then, you can implement a peaking filter or a notch filter in SigmaStudio to cut that particular problem frequency. If you wish to make the system more elegant, you could measure the RMS power in various bands. If the problem frequency has a large amount of power relative to the rest of the signal, this can be identified as feedback and, using the logic blocks in SigmaStudio, you can use that information to turn on the notch filter.

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EZ Admin