Auditory spectro-temporal processing in the envelope-frequency domain: experiments and models

This thesis investigates the processing of the envelope of sounds in the human auditory system. Psychoacoustic methods are used to examine the i) envelope-frequency selectivity, ii) coding of amplitude-modulation depth, and the iii) analysis of complex modulations. A functional model of hearing is proposed that successfully accounts for the empirical data. Chapter 1 derives the bandwidth and the shape of auditory modulation filters in terms of a critical-band concept in the envelope-frequency domain. Chapter 2 addresses the role of internal and external limitations in amplitude-modulation detection and discrimination. In Chapter 3, the role of beats between modulations (venelope fluctuations) in modulation-masking experiments is examined. Chapter 4 further investigates the processes underlying the extraction of the venelope in the normal-hearing and sensorineural hearing-impaired auditory system. Chapter 5 shows that the frequency selectivity in the envelope-frequency domain reflects a "true" limited-resolution spectral decomposition, and not a selective process tuned to different repetition rates of the envelope.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Oldenburg

Year

2002

Author dc:creator

• Ewert, Stephan

• [Keine Schlagwörter von Autor/in vergeben.]

Repository record source_url

http://oops.uni-oldenburg.de/216

OAI identifier oai:identifier

oai:oops.uni-oldenburg.de:216