The role of high-frequency envelope fluctuations for speech masking release.

Søren Jørgensen, Torsten Dau

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Abstract

The speech-based envelope power spectrum model [sEPSM; Jørgensen and Dau (2011), Jørgensen et al. (2013)] was shown to successfully predict speech intelligibility in conditions with stationary and fluctuating interferers, reverberation, and spectral subtraction. The key element in the model was the multi-resolution estimation of the signal-to-noise ratio in the envelope domain (SNRenv) at the output of a modulation filterbank. The simulations suggested that mainly modulation filters centered in the range from 1 to 8 Hz contribute to speech intelligibility in the case of stationary maskers whereas modulation filters tuned to frequencies above 16 Hz might be important in the case of fluctuating maskers. In the present study, the role of high-frequency envelope fluctuations for speech masking release was further investigated in conditions of speech-on-speech masking. Simulations were compared to various measureddata from normal-hearing and hearing-impaired listeners [Festen and Plomp (1990), Christiansen et al. (2013)]. The results support the hypothesis that high-frequency envelope fluctuations (>30 Hz) are essential for speech intelligibility in conditions with speech interferers. While the sEPSM reflects effects of energetic and modulation masking in speech intelligibility, the remaining unexplored effect in some conditions may be attributed to, and defined as, “information masking.”
Original languageEnglish
JournalJournal of the Acoustical Society of America
Volume133
Issue number5
Pages (from-to)3391
Number of pages1
ISSN0001-4966
DOIs
Publication statusPublished - 2013
Event21st International Congress on Acoustics - Montreal, Canada
Duration: 2 Jun 20137 Jun 2013
Conference number: 21
http://www.ica2013montreal.org/

Conference

Conference21st International Congress on Acoustics
Number21
Country/TerritoryCanada
CityMontreal
Period02/06/201307/06/2013
Internet address

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