A recently developed analysis and resynthesis tool, the wavelet transform, has much in common with the FFT, except that its analysis filters are spaced logarithmically. Graphical pictures of wavelet analyses correspond much more closely to the perception of the ear than does the FFT. Interested readers are directed to the article in Computer Music Journal Vol 12.4, and to the book Representations of Musical Signals, ed. Poli, Piccialli and Roads, recently published by the MIT Press.)
The code in haar came from http://www.bearcave.com
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