Gammatone filter

A gammatone response was originally proposed in 1972 as a description of revcor functions measured in the cochlear nucleus of cats.

This time-domain impulse response is a sinusoid (a pure tone) with an amplitude envelope which is a scaled gamma distribution function.

[2] Gammatone filterbank cepstral coefficients (GFCCs) are auditory features that have been used first in the speech domain, and later in the field of underwater target recognition.

[citation needed] A bank of gammatone filters is used as an improvement on the triangular filters conventionally used in mel scale filterbanks and MFCC features.

Different ways of motivating the gammatone filter for auditory processing have been presented by Johannesma,[1] Patterson et al.,[3] Hewitt and Meddis,[4] and Lindeberg and Friberg.

[6] Lindeberg and Friberg define a new family of generalized gammatone filters.