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The Auditory Filter Bank

It has been proposed that the peripheral auditory system effectively applies a filter bank to the acoustic signal reaching the ear drum. The output of this filter bank, consisting of the analysis signals $x_1(n), x_2(n), \ldots$, then affects the information transmitted to the auditory organs of the brain. In simulating the human auditory periphery, much scientific work to date thus employs some form of filter bank to emulate the characteristics of this proposed auditory bank. Some natural questions arise regarding this proposal:

In the following sub-sections, we present the characteristics of two popular types of auditory filter banks: a more traditional, third-octave filter bank, and a more recently proposed Equivalent Rectangular Bandwidth (ERB) filter bank.

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Download aud_fb.pdf

``Auditory Filter Bank Lab'', by Ryan J. Cassidy and Julius O. Smith III,
REALSIMPLE Project — work supported by the Wallenberg Global Learning Network .
Released 2008-06-05 under the Creative Commons License (Attribution 2.5), by Ryan J. Cassidy and Julius O. Smith III
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University