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- [B, A] = butter( 2, 3000/16000*2, 'high' );
- fvtool
- plot(w)
- [H,W] = freqz(B,A,N) returns the N-point complex frequency response
- vector H and the N-point frequency vector W in radians/sample of
- the filter.
- plt(w, angle(h));
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