EUROSPEECH '91
Second European Conference on Speech Communication and Technology

Genova, Italy
September 24-26, 1991

                 

An Adaptive Cochlear Model for Speech Recognition

Eliathamby Ambikairajah, Liam Kilmartin

Dept. of Electronic Engineering, Regional Technical College, Athlone, Ireland

This paper describes an adaptive cochlear model, in which the basilar membrane is modelled as a cascade of 128 digital filters, covering the frequency band from 70 Hz to 3. 4 kHz. The output of the inner hair cell of each filter is used to vary the coefficients of that filter so that its Q-factor is modified. Thus, for a low-amplitude stimulus, the Q-factor is increased, while it is decreased for a high-amplitude stimulus. This modification takes place at a rate which simulates the continuous adaptation of the basilar membrane. Results are presented for sinusoidal stimuli of different amplitudes, and also for speech input signals. Keywords: auditory modelling, speech processing.

Full Paper

Bibliographic reference.  Ambikairajah, Eliathamby / Kilmartin, Liam (1991): "An adaptive cochlear model for speech recognition", In EUROSPEECH-1991, 1331-1334.