How can I get a two-dimensional contour line graph from Wavelet Time-Frequency analysis?
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Hi, How can I obtain a visualizing scalogram similar to that shown in Figure 1 using Wavelet Time-Frequency analysis?
Figure 1:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1541742/image.jpeg)
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William Rose
2023년 11월 16일
Here is an example:
fs=1000; % sampling rate (Hz)
t=(0:1000)/fs; % time vector for x (s)
x=chirp(t,50,1,300)+chirp(t,350,1,75); % x= sum of up-chirp and down-chirp
% next: compute STFT
[s,f,t1]=stft(x,fs,'FrequencyRange','onesided','FFTLength',64,'Window',hann(64));
contour(t1,f,abs(s)) % plot contours of STFT
colorbar
Good luck.
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William Rose
2023년 11월 18일
@ Navid, YOu are welcome. Good job on the wavelet transform. Best wishes for success in your work.
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