Modelling Auditory Processing and Organisation

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Cambridge University Press, Feb 17, 2005 - Computers - 136 pages
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We are surrounded by noise; we must be able to separate the signals we want to hear from those we do not. To overcome this 'cocktail party effect' we have developed various strategies; endowing computers with similar abilities would enable the development of devices such as intelligent hearing aids and robust speech recognition systems. This book describes a system which attempts to separate multiple, simultaneous acoustic sources using strategies based on those used by humans. It is both a review of recent work on the modelling of auditory processes, and a presentation of a new model in which acoustic signals are decomposed into elements. These structures are then re-assembled in accordance with rules of auditory organisation which operate to bind together elements that are likely to have arisen from the same source. The model is evaluated by measuring its ability to separate speech from a wide variety of other sounds, including music, phones and other speech.
 

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Contents

physiology function and a computer model
9
Auditory representations
33
Modelling auditory scene exploration
51
Implementation of auditory grouping principles
63
An evaluation of sound source separation in the model
79
Conclusions and future development
93
B Derivations relating to the hair cell model
103
Index
119
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Page 116 - In Psychophysics and Physiology of Hearing. EF Evans and JP Wilson (eds.), London: Academic Press, 1977. [9] Meddis, R. and Hewitt, MJ "Virtual pitch and phase sensitivity of a computer model of the auditory periphery. I: Pitch identification.
Page 109 - Modelling the perception of concurrent vowels: Vowels with different fundamental frequencies,
Page 109 - S. (1990). Automatic speech recognition using a reduced auditory representation and position-tolerant discrimination.
Page 112 - Norris, BE (1975). Single unit activity in the posteroventral cochlear nucleus of the cat. J^ Comp. Neurol..
Page 110 - Ribaupierre. 1985. Evoked mechanical responses of isolated cochlear outer hair cells.
Page 112 - D (1984) Graded and nonlinear mechanical properties of sensory hairs in the mammalian hearing organ.
Page 110 - A Functional Model of Signal Processing in the Peripheral Auditory System", Acustica, 31, 349-353.

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