The Influence of Distributed Source Regions in the Formation of the Nonlinear Distortion Component of Cubic Distortion-Product Otoacoustic Emissions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F19%3A00333108" target="_blank" >RIV/68407700:21230/19:00333108 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/19:00333108

Výsledek na webu

<a href="https://doi.org/10.1121/1.5100611" target="_blank" >https://doi.org/10.1121/1.5100611</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1121/1.5100611" target="_blank" >10.1121/1.5100611</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Influence of Distributed Source Regions in the Formation of the Nonlinear Distortion Component of Cubic Distortion-Product Otoacoustic Emissions

Popis výsledku v původním jazyce

Distortion product otoacoustic emissions (DPOAEs) are evoked by two stimulus tones with frequency f1 and f2 of ratio f2 / f1 in the range between approximately 1.05 and 1.4. This study theoretically and experimentally analyzes the cubic 2 f1 - f2 DPOAE for different stimulus levels of one of the tones while the other is constant. Simulations for f2 / f1 of 1.2 and moderate stimulus levels (30-70 dB sound pressure level) indicate that cubic distortion products are generated along a relatively large length of the basilar membrane, the extent of which increases with stimulus level. However, apical from the place of maximum nonlinear force, the wavelets generated by these distributed sources mutually cancel. Therefore, although the spatial extent of the primary DPOAE sources broadens with increasing stimulus level (up to 1.5 oct), the basilar-membrane region contributing to the DPOAE signal is relatively narrow (0.6 oct) and level independent. The observed dependence of DPOAE amplitude on stimulus level can be well-approximated by a point source at the basilar-membrane place where the largest distortion product (maximum of the nonlinear force) is generated. Onset and offset of the DPOAE signal may contain amplitude overshoots (complexities), which are in most cases asymmetrical. Two-tone suppression was identified as the main cause of these onset and offset complexities. DPOAE measurements in two normal-hearing subjects support the level dependence of the steady-state DPOAE amplitude and the asymmetry in the onset and offset responses predicted by the theoretical analysis.

Název v anglickém jazyce

The Influence of Distributed Source Regions in the Formation of the Nonlinear Distortion Component of Cubic Distortion-Product Otoacoustic Emissions

Popis výsledku anglicky

Distortion product otoacoustic emissions (DPOAEs) are evoked by two stimulus tones with frequency f1 and f2 of ratio f2 / f1 in the range between approximately 1.05 and 1.4. This study theoretically and experimentally analyzes the cubic 2 f1 - f2 DPOAE for different stimulus levels of one of the tones while the other is constant. Simulations for f2 / f1 of 1.2 and moderate stimulus levels (30-70 dB sound pressure level) indicate that cubic distortion products are generated along a relatively large length of the basilar membrane, the extent of which increases with stimulus level. However, apical from the place of maximum nonlinear force, the wavelets generated by these distributed sources mutually cancel. Therefore, although the spatial extent of the primary DPOAE sources broadens with increasing stimulus level (up to 1.5 oct), the basilar-membrane region contributing to the DPOAE signal is relatively narrow (0.6 oct) and level independent. The observed dependence of DPOAE amplitude on stimulus level can be well-approximated by a point source at the basilar-membrane place where the largest distortion product (maximum of the nonlinear force) is generated. Onset and offset of the DPOAE signal may contain amplitude overshoots (complexities), which are in most cases asymmetrical. Two-tone suppression was identified as the main cause of these onset and offset complexities. DPOAE measurements in two normal-hearing subjects support the level dependence of the steady-state DPOAE amplitude and the asymmetry in the onset and offset responses predicted by the theoretical analysis.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10307 - Acoustics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA

ISSN

0001-4966

e-ISSN

1520-8524

Svazek periodika

145

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

23

Strana od-do

2909-2931

Kód UT WoS článku

000483973600027

EID výsledku v databázi Scopus

2-s2.0-85065814755