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Envelope regularity discrimination

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journal contribution
posted on 09.08.2019, 13:03 by BCJ Moore, AP Sȩk, Vinay, Christian Fullgrabe
© 2019 Acoustical Society of America. The ability to discriminate irregular from regular amplitude modulation was assessed using the "envelope regularity discrimination" test. The amount of irregularity was parametrically varied and quantified by an "irregularity index." Normative data were gathered for young subjects with normal audiometric thresholds. Parameters varied were the carrier and modulation frequencies, f c and f m , and the baseline modulation index, m. All tests were performed using a background threshold-equalizing noise. The main findings were (1) using f c = 4000 Hz, f m = 8 Hz, and m = 0.3, performance improved over the first two threshold runs and then remained roughly stable, and there was a high correlation between thresholds obtained at 80 dB sound pressure level (SPL) and at 20 dB sensation level; (2) using f m = 8 Hz and m = 0.3 with a level of 80 dB SPL, thresholds did not vary significantly across f c = 1000, 2000, and 4000 Hz; (3) using f m = 8 Hz and f c = 4000 Hz with a level of 80 dB SPL, thresholds did not vary significantly for m from 0.2 to 0.5; and (4) using m = 0.3 and f c = 4000 Hz with a level of 80 dB SPL, thresholds improved with increasing f m from 2 to 16 Hz. For all conditions, there was substantial individual variability, probably resulting from differences in "processing efficiency."

Funding

Engineering and Physical Sciences Research Council (UK, Grant No. RG78536)

History

School

  • Sport, Exercise and Health Sciences

Published in

Journal of the Acoustical Society of America

Volume

145

Issue

5

Pages

2861 - 2870

Publisher

Acoustical Society of America

Version

AO (Author's Original)

Rights holder

© Acoustical Society of America

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in Moore, BCJ; Sȩk, AP; Vinay; Füllgrabe, C (2019): Envelope regularity discrimination. Journal of the Acoustical Society of America, 145(5), pp. 2861 - 2870 and may be found at https://doi.org/10.1121/1.5100620

Acceptance date

16/04/2019

Publication date

2019-05-08

Copyright date

2019

ISSN

0001-4966

eISSN

1520-8524

Language

en

Depositor

Dr Christian Fullgrabe

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