mirror of https://github.com/thesofproject/sof.git
18 lines
431 B
Matlab
18 lines
431 B
Matlab
function dcblock_plot_transferfn(R, fs);
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% Plot the transfer function.
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% For a DC Blocking filter: H(z) = (1-1/z)/(1 - R/z)
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% Therefore the coefficients are b = [1 -1], a = [1 -R]
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b = [1 -1];
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a = [1 -R];
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f = linspace(1, fs/2, 500);
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semilogx(f, 20*log10(freqz(b, a, f, fs)));
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grid on
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xlabel('Frequency (Hz)');
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ylabel('Magnitude (dB)');
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tstr = sprintf("DC Blocking Filter Frequency Response, R = %i", R);
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title(tstr);
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endfunction
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