MATLAB: How to apply a designed Low pass filter on an audio file

audiofilter

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');

Best Answer

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);

Related Solutions

MATLAB: Audio Processing

Hi Kathik, You have left out an important bit of information and that is the sampling frequency. I'll assume that is 44.1 kHz in this example.

In what follows, Hd1 is an FIR equiripple design and H2 is an IIR Butterworth design. I'll use 50 dB of attenuation.

d = fdesign.lowpass('Fp,Fst,Ap,Ast',6000,6200,0.5,50,44100);
Hd1 = design(d);
Hd2 = design(d,'butter');

To apply the filter to data, use

    output = filter(Hd1,input);

MATLAB: How to slice an audio from the front, and extract and save audio from the back.

You can just delete the initial part of the audio signal and save it into the audio file. For example

[s, fs] = audioread('sample.wav');
s2 = s;
s2(1:2*fs) = [];
audiowrite('new_file.wav', s2, fs);

Best Answer

Related Solutions

MATLAB: Audio Processing

MATLAB: How to slice an audio from the front, and extract and save audio from the back.

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