wavelet101

Directory information

├──docs
├──FFT_STFT_wavelet_101.ipynb   --> Examples for FFT, STFT, CWT and DWT.
├──README.md
├──murmur_201101180902.wav      --> 8-second long abnormal heartsound with murmur.
├──normal_201103101140.wav      --> 9-second long normal heartsound.
  

Examples

• FFT frequency spectrum
  
  

• STFT spectrogram
  
  

• CWT
  
  

• DWT
  
  

Material and prerequisite of wavelet analysis

• FFT zero-padding
  https://dsp.stackexchange.com/questions/741/why-should-i-zero-pad-a-signal-before-taking-the-fourier-transform
  http://www.bitweenie.com/listings/fft-zero-padding/
• Wavelet analysis
  [★★★★★] http://users.rowan.edu/~polikar/WTtutorial.html
  [in Chinese] https://www.zhihu.com/question/22864189
  [in Chinese] https://blog.csdn.net/jbb0523/article/details/42554693
  [in Chinese] https://blog.csdn.net/jbb0523/article/details/42470103

API reference

• PyWavelets
  https://pywavelets.readthedocs.io/en/latest/ref/index.html
• LibROSA
  https://librosa.github.io/librosa/index.html