Tools: Tune: dcblock: Avoid warning about ignoring imaginary

The abs() function need to be added to plot the correct magnitude response. Matlab warned in this case about ignoring imaginary part. Signed-off-by: Seppo Ingalsuo <[email protected]>
thesofproject · Sep 14, 2023 · 884bad4 · 884bad4
1 parent dec770d
commit 884bad4
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/tools/tune/dcblock/dcblock_plot_transferfn.m b/tools/tune/dcblock/dcblock_plot_transferfn.m
@@ -7,7 +7,7 @@
 
 f = linspace(1, fs/2, 500);
 
-semilogx(f, 20*log10(freqz(b, a, f, fs)));
+semilogx(f, 20*log10(abs(freqz(b, a, f, fs))));
 grid on
 xlabel('Frequency (Hz)');
 ylabel('Magnitude (dB)');