Wavelets are mathematical basis functions that are localized in both time and
frequency. Wavelet transforms are time-frequency transforms employing wavelets.
They are similar to Fourier transforms, the difference being that Fourier
transforms are localized only in frequency instead of in time and frequency.
WWW: https://github.com/PyWavelets/pywt
PR: 217426
Submitted by: eric@camachat.org
