High quality spectrogram with a few seconds signal

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Diana 2016-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/267003-high-quality-spectrogram-with-a-few-seconds-signal

评论： Rick Rosson 2016-2-8

I am trying to get a high quality spectrogram with a signal that is only 5 seconds long. This is the line I am using: the sampling frequency is 1000Hz.

spectrogram(signal,128,64,2048,fs,'yaxis')

I do not get the quality I need. Is there something I could do?

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Answer 1

Rick Rosson 2016-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/267003-high-quality-spectrogram-with-a-few-seconds-signal#answer_208908

编辑：Rick Rosson 2016-2-8

在 MATLAB Online 中打开

Please try the following:

   % Window duration (in seconds):
   dur = 0.5;
   % Spectrogram settings (in samples):
   winSize = round(fs*dur);
   overlap = round(winSize/2);
   fftSize = winSize;
   % Plot the spectrogram:
   spectrogram(signal,winSize,overlap,fftSize,fs,'yaxis');