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DEMO_AUDITORYFILTERBANK - Construct an auditory filterbank

Description

In this file we construct a uniform filterbank using a the impulse response of a 4th order gammatone for each channel. The center frequencies are equidistantly spaced on an ERB-scale, and the width of the filters are chosen to match the auditory filter bandwidth as determined by Moore.

Each channel is subsampled by a factor of 8 (a=8), and to generate a nice plot, 4 channels per Erb have been used.

The filterbank covers only the positive frequencies, so we must use filterbankrealdual and filterbankrealbounds.

demo_auditoryfilterbank_1.png

Classic spectrogram

A classic spectrogram of the spoken sentense. The dynamic range has been set to 50 dB, to highlight the most important features.
demo_auditoryfilterbank_2.png

Auditory filterbank representation

Auditory filterbank representation of the spoken sentense using gammatone filters on an Erb scale. The dynamic range has been set to 50 dB, to highlight the most important features.

References:

B. R. Glasberg and B. Moore. Derivation of auditory filter shapes from notched-noise data. Hearing Research, 47(1-2):103, 1990.