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

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

Answer 1

[Chunru]

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')

[Med Future]

@Chunru How can i check it is accurate plot, because is have different types of modulation, i want to train deep learning network on that

[Chunru]

I don't understand your question. For data with different modulations, you will get different images with the same spectrogram function.

[Med Future]

@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