Audio Filtering with fdesign

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micpro le 13 Jan 2017

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https://fr.mathworks.com/matlabcentral/answers/320265-audio-filtering-with-fdesign

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Hi, I want to filter audio : 20Hz-20kHz, I mean removing frequencies lower than 20Hz and higher than 20kHz, I apply bandpass filter (Fs is my sampling frequency and known before this line in programme), hlpf=fdesign.lowpass('Fp,Fst,Ap,Ast',20,20e4,2,60,Fs)

Is it wrong? I check it's output file with another audio software, and the filtered signal is in the picture, Thanks for help.