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Title: The implications of peripheral auditory mechanisms for the perception and recognition of speech and other acoustic waveforms
Author: Monro, Donald Martin
Awarding Body: University of London
Current Institution: Imperial College London
Date of Award: 1971
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Digital computer simulation, based on recent physiological measurements in the cat, is employed to investigate the behaviour of the peripheral auditory system under stimulus in some situations important to human perception. In developing the models required, new relationships are derived to describe the processes of binaural interaction and mechanical—neural transduction in the auditory system. The resulting responses, displayed graphically, closely emulate the corresponding perceptual and physiological behaviour, and so demonstrate the role played by peripheral processing in auditory perception. Several major practical developments have been required and are described in appendices: a program for graphical representation of three dimensional data as surfaces using contours, an efficient realization of the Fast Fourier algorithm, the use of simple digital filters to simulate linear systems efficiently, and methods of continuous high speed acquisition of analogue data in digital form. The peripheral response to speech is examined and it is found that the form of response is consistent with a frequency analysis approach, as is often used to characterize speech, and a related method of improving the efficienty of automatic speech recognition is presented. An operational description of binaural image formation with speech and other wideband signals is developed and examined, which leads to further information about neural mechanisms and time/intensity relationships in binaural judgements. Consideration of neural activity in response to complex tones facilitates a proposed identification of the principal auditory nonlinearity. As a result of these studies a view of peripheral processing as an essential contribution to perception is achieved.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available