{"id":{"repo_id":"oldenburg","oai_identifier":"oai:oops.uni-oldenburg.de:216"},"canonical_url":"https://search.dev.ndltd.org/etd/oldenburg/oai:oops.uni-oldenburg.de:216","repository":{"repo_id":"oldenburg","name":"Carl von Ossietzky Universität Oldenburg","base_url":"http://oops.uni-oldenburg.de/cgi/oai2"},"display":{"title":"Auditory spectro-temporal processing in the envelope-frequency domain: experiments and models","abstract":"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.","abstract_html":"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.","abstract_has_math":false,"creators":["Ewert, Stephan"],"institution":"Universität Oldenburg","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-12-18","date_published":"2002-12-18","updated_at":"2026-07-27T20:27:18Z","subjects":["[Keine Schlagwörter von Autor/in vergeben.]"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://oops.uni-oldenburg.de/216","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Ewert, Stephan"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["BIS der Universität Oldenburg"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Oldenburg"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["[Keine Schlagwörter von Autor/in vergeben.]"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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.","Diese Dissertation behandelt die Verarbeitung der Einhüllenden von Schallen im auditorischen System des Menschen. Es wird die i) Selektivität für Einhüllendenfrequenzen, ii) Kodierung der Modulationstiefe und die iii) Analyse von komplexen Modulationen mit psychoakustischen Methoden untersucht. Ein funktionelles Hörmodell wird vorgeschlagen, das die empirischen Daten erfolgreich beschreibt. Kapitel 1 bestimmt die Bandbreite und die Form auditorischer Modulationsfilter. Kapitel 2 untersucht die Rolle interner und externer Limitationen bei der Detektion und Diskrimination von Amplitudenmodulationen. In Kapitel 3 wird der Einfluss von Schwebungen zwischen Modulationen (Venelope-Fluktuationen) auf Modulationsmaskierungsexperimente untersucht. Kapitel 4 beleuchtet die der Extraktion der Venelope zugrunde liegenden Prozesse in Normal- und Innenohr-Schwerhörenden. Kapitel 5 zeigt, dass die Frequenzselektivität im Einhüllendenfrequenzbereich eine \"wirkliche\" spektrale Zerlegung der Einhüllenden widerspiegelt und es sich nicht um einen Prozess handelt, der auf verschiedene Wiederholraten der Einhüllenden abgestimmt ist."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Auditory spectro-temporal processing in the envelope-frequency domain: experiments and models"]}]}],"canonical_facts":{"dc:creator":["Ewert, Stephan"],"dc:description.abstract":["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.","Diese Dissertation behandelt die Verarbeitung der Einhüllenden von Schallen im auditorischen System des Menschen. Es wird die i) Selektivität für Einhüllendenfrequenzen, ii) Kodierung der Modulationstiefe und die iii) Analyse von komplexen Modulationen mit psychoakustischen Methoden untersucht. Ein funktionelles Hörmodell wird vorgeschlagen, das die empirischen Daten erfolgreich beschreibt. Kapitel 1 bestimmt die Bandbreite und die Form auditorischer Modulationsfilter. Kapitel 2 untersucht die Rolle interner und externer Limitationen bei der Detektion und Diskrimination von Amplitudenmodulationen. In Kapitel 3 wird der Einfluss von Schwebungen zwischen Modulationen (Venelope-Fluktuationen) auf Modulationsmaskierungsexperimente untersucht. Kapitel 4 beleuchtet die der Extraktion der Venelope zugrunde liegenden Prozesse in Normal- und Innenohr-Schwerhörenden. Kapitel 5 zeigt, dass die Frequenzselektivität im Einhüllendenfrequenzbereich eine \"wirkliche\" spektrale Zerlegung der Einhüllenden widerspiegelt und es sich nicht um einen Prozess handelt, der auf verschiedene Wiederholraten der Einhüllenden abgestimmt ist."],"dc:format.medium":["application/pdf"],"dc:publisher":["BIS der Universität Oldenburg"],"dc:subject":["[Keine Schlagwörter von Autor/in vergeben.]"],"dc:title":["Auditory spectro-temporal processing in the envelope-frequency domain: experiments and models"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Oldenburg"]},"updated_at":"2026-07-27T20:27:18Z"}