How to apply STFT and convert it into Time frequency Image In MATLAB

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Med Future
Med Future 2022-6-2
评论： Med Future 2022-6-2
Hello everyone, I hope you all are doing well. I have the following signal generated from example https://www.mathworks.com/help/deeplearning/ug/modulation-classification-with-deep-learning.html.
I want to apply STFT then convert it into Time frequency image for training Resnet50

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Chunru
Chunru 2022-6-2
Ran in:
load frame8PSK001
whos
Name Size Bytes Class Attributes ans 1x41 82 char cmdout 1x33 66 char frame 1024x1 16384 double complex label 1x1 1363 categorical
nfft=128;
% doc spectrogram for more details
spectrogram(frame, hamming(nfft), nfft/2, nfft, 'centered')
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Chunru
Chunru 2022-6-2
I don't understand your question. For data with different modulations, you will get different images with the same spectrogram function.
Med Future
Med Future 2022-6-2
@Chunru Can you modified the answer, which read all .mat files from the folder and make spectogram of the dataset and save the spectrogram in with class labels

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