INTERSPEECH 2008
9th Annual Conference of the International Speech Communication Association

Brisbane, Australia
September 22-26, 2008

Introducing the Compression Wave Cochlear Amplifier

Matthew R. Flax, W. Harvey Holmes

University of New South Wales, Australia

The compression wave cochlear amplifier (CW-CA) model is introduced for the first time. This is the first cochlear amplifier model that is soundly based on the physiology of the inner ear and neural centres. The CW-CA, which is assumed to be driven by the basilar travelling wave (TW), includes outer hair cell (OHC)motility and neural signal transmissions between the hair cells and the central nervous system as key elements. The OHC motility sets up a pressure wave in the cochlear fluids, which is modulated by the neural feedback. The CW-CA is represented mathematically as a delay-differential equation (DDE). Even the simplest model based on this concept is capable of explaining a wide range of hearing phenomena, including various types of otoacoustic emissions, distortion products, two-tone suppression, amplifier gain and compression, frequency specificity, neural spontaneous rates and many other phenomena including various pathological conditions.

Full Paper

Bibliographic reference.  Flax, Matthew R. / Holmes, W. Harvey (2008): "Introducing the compression wave cochlear amplifier", In INTERSPEECH-2008, 679-682.