Frequency selectivity at very low centre frequencies: the influence of the helicotrema on individual differences in low-frequency sound perception

Carlos Andrés Jurado Orellana, Christian Sejer Pedersen, Torsten Marquardt

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Abstrakt

A significant factor in the decrease of sensitivity to low-frequency sound is the helicotrema shunt effect. In humans, it causes a slope increase of the middle-ear transfer function (METF) from 6 dB/oct to 12 dB/oct below approximately 50 Hz [Marquardt et al., J.Acoust. Soc. Am. 121, 3628-3638 (2007)]. Recent experiments showed that the exact frequency varies from individual to individual. Besides, the helicotrema region in the METF has been found to highly influence frequency selectivity for centre frequencies (CFs) below 80 Hz (Jurado and Moore in prep). By using individual METF measurements based on OAE suppression techniques and notched-noise masking data psychophysically measured for centre frequencies in the range 50-125 Hz, this study examines how individual differences in frequency selectivity, as well as in masking, may occur at very low CFs due to individual differences in the shape of the METFs, thought to be affected by the helicotrema impedance. Preliminary analysis indicates that individual differences in the METFs might underlay the observed individual differences in frequency selectivity. Main effects predicted by the calculations are a pronounced flattening off of the upper filter skirts and a shift in the tip, typically upwards in frequency, for auditory filters with CFs below about 80 Hz.
OriginalsprogEngelsk
TitelProceedings from 14th International Conference on Low Frequency Noise and Vibration and its Control
RedaktørerFlemming Christensen, Christian Sejer Pedersen
UdgivelsesstedAalborg
ForlagAcoustics, Department of Electronic Systems, Aalborg University
Publikationsdato2010
Sider129-145
ISBN (Trykt)978-87-92328-33-5
StatusUdgivet - 2010
Begivenhed14th International Meeting on Low Frequency Noise and Vibration and its Control - Aalborg, Danmark
Varighed: 9 jun. 201011 jun. 2010
Konferencens nummer: 14

Konference

Konference14th International Meeting on Low Frequency Noise and Vibration and its Control
Nummer14
LandDanmark
ByAalborg
Periode09/06/201011/06/2010

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