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Effect of masker level on overshoot in running‐ and frozen‐noise maskers

Klitzing, Regine von ; Kohlrausch, Armin (2022)
Effect of masker level on overshoot in running‐ and frozen‐noise maskers.
In: The Journal of the Acoustical Society of America, 95 (4)
doi: 10.26083/tuprints-00019941
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Effect of masker level on overshoot in running‐ and frozen‐noise maskers
Language: English
Date: 2022
Place of Publication: Darmstadt
Publisher: AIP Publishing
Journal or Publication Title: The Journal of the Acoustical Society of America
Volume of the journal: 95
Issue Number: 4
DOI: 10.26083/tuprints-00019941
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Origin: Secondary publication service

Masked thresholds were measured with running‐ and frozen‐noise maskers. The 5‐kHz signal was 2 ms in duration. The masker was low‐pass noise (20 Hz–10 kHz); its total duration was 300 ms. The overall level of the masker was 30, 50, or 70 dB SPL. The onset of the signal was delayed by 0, 3, 8, 18, 198, or 278 ms relative to the onset of the masker. In all frozen‐noise measurements, the signal was added to the same fine structure of the noise. Overshoot in frozen noise was measured for two starting phases of the signal that led to a 10‐dB difference for large signal‐onset delays. In all three configurations (running noise and frozen noise with two different signal phases) masker level had a similar influence on overshoot. At the intermediate masker level (50 dB SPL), a significant amount of overshoot (up to 15 dB) was observed in all three conditions. At the low and the high masker levels, overshoot was very much reduced, and even became negative in most conditions for the 30‐dB‐SPL masker. For the 50‐dB frozen‐noise masker, the total variation of thresholds with signal phase was 8 to 11 dB for long signal‐onset delays, but only 3 to 6 dB for short delays. For the low‐ and high‐level maskers, where only a small overshoot was observed, the threshold variation with phase for a signal at masker onset was the same as that for the long‐delay condition. An explanation for the variation of signal detectability with masker level is proposed that refers explicitly to the compressive input–output characteristic of the basilar membrane at intermediate levels.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-199418
Classification DDC: 500 Science and mathematics > 530 Physics
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 07 Dec 2022 13:04
Last Modified: 17 Mar 2023 09:09
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19941
PPN: 506089967
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