How can I apply a designed Low pass filter on an audio file ?

Question

Han 2018-5-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/399974-how-can-i-apply-a-designed-low-pass-filter-on-an-audio-file

回答： Ameer Hamza 2018-5-9

采纳的回答： Ameer Hamza

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i have a designed Low pass filter

i want to apply this low pass filter on an audio file

How can i do ?

i only know that i can use [y,Fs] = audioread('XXX.wav');

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Answer 1

Ameer Hamza 2018-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/399974-how-can-i-apply-a-designed-low-pass-filter-on-an-audio-file#answer_319472

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You can use Control system approach to filter this signal as follow

[data, fs] = audioread('sample.wav');
T = 1/fs;
t = (0:size(data,1)-1)'*T; % get time of samples;
filter = tf(18181818, [1 9090.9090909090 18181818.181818]);
channel1_filtered = lsim(filter, data(:,1), t);
channel2_filtered = lsim(filter, data(:,2), t);