1. 
   Gammatone filter
   This is a sinusoid (a pure tone) with an amplitude envelope which is a scaled gamma distribution function. ==Variations== Variations and improvements of the gammatone model of auditory filtering include the gammachirp filter, the all-pole and one-zero gammatone filters, the two-sided gammatone filt...
   Found op http://en.wikipedia.org/wiki/Gammatone_filter
   
   

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