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hi @rainskyfyy I think `#1~5` is implemented in `noise_estimator` (line 82), which are the steps of IMCRA.

Yes. I tested the code on the audio collected by a 4-mic circular array [(ST BlueCoin)](https://www.st.com/en/evaluation-tools/steval-bcnkt01v1.html).

> There is no actual sound file input code? Yes. According to the beamforming, you can get the enhanced signal by X(f)), where W^*(f) is the conj transpose of `cdma.get_weight()`...

I collected the audio by micphone array and process it on PC. And if you want to process the signal on the MCU or DSP, you have to implement the...

>Your implementation is to collect 4 channels of sound through a 4 mic array, then enter your program for processing, and get the result of 1 channel? Yes.