Get STFT plot with matrix Input
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Hello,
I am working with a radar output Q/ I matrix and I want to apply stft on the complex matrix (I + j Q) using matlab.
The stft function didn't accept Matrix Input. Is there a way to do it ?
Thank you so much in advance :)
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Risposte (2)
Priyanshu Mishra
il 19 Set 2019
Hi Nour,
In the documentation page of stft, under the input argument section, it is mentioned that x can take vector and matrix both. You may refer to examples given in the documentation page of stft.
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Sara James
il 21 Ott 2019
The stft function in 2019b only supports plotting of vector inputs. If you want to use the convenience plot of stft for your matrix input, you could do so within a for loop. Alternatively, you could specify your own plots using pcolor and subplot like in the following example:
fs = 1e3; % Sampling frequency (Hz)
t = 0:1/fs:1-1/fs; % Time (sec)
x = [chirp(t,100,1,300,'quadratic',45,'concave');
chirp(t,200,1,600,'quadratic',[],'convex');
chirp(t,300,1,500,'logarithmic')]'; % Multi-channel signal
[S,F,T] = stft(x,fs,'Window',hamming(128,'periodic'),'OverlapLength',50);
smag = mag2db(abs(S)); % Convert to dB
caxisLims = max(smag(:)) + [-60 0]; % Color axis limits
figure('Name','STFT')
numChannels = size(x,2);
for ii = 1:numChannels
subplot(2,2,ii)
pcolor(T,F,smag(:,:,ii))
xlabel('Time (s)')
ylabel('Frequency (Hz)')
shading flat
colorbar
caxis(caxisLims)
title(sprintf('Channel %d',ii))
end
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