audio signal in spectrogram

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Gokul
Gokul 2013-3-7
回答： UMAIR RASOOL 2020-8-1
Hello,
How to apply window function for a audio signal in spectrogram and compare it with the one without applying window function ?

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Wayne King
Wayne King 2013-3-7
编辑：Wayne King 2013-3-7
You can supply the window argument as a vector.
Signal
t=0:0.001:2;
x=chirp(t,0,1,150);
Now to find the short-time Fourier transforms
% without a window
win = ones(200,1);
[S,F,T] = spectrogram(x,win,100,200,1000);
% with a hamming window
win = hamming(200);
[Swin,Fwin,Twin] = spectrogram(x,win,100,200,1000);
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Gokul
Gokul 2013-3-8
I have assumed : x=wavread('tiggers.wav'); now how to analyze the spectrogram() for this with and without window? Is this the following way % without a window [S,F,T] = spectrogram(x); % with a hamming window win = hamming(200); [Swin,Fwin,Twin] = spectrogram(x,win,100,fs);
suggest please
Wayne King
Wayne King 2013-3-8
[S,F,T] = spectrogram(x);
is not without a window. If you read the documentation, you'll see that syntax uses a Hamming window.
I've shown you how to not use a window function above. Use a vector of ones, or rectwin()

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UMAIR RASOOL
UMAIR RASOOL 2020-8-1
close all
clear all
clc
[y,Fs]=audioread('black_hole.mp3');
windowSize = 256;
windowOverlap = [];
freqRange = 0:Fs;
spectrogram(y(:,1), windowSize, windowOverlap, freqRange, Fs, 'xaxis');

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