Chapter title |
Speech Intelligibility for Target and Masker with Different Spectra
|
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Chapter number | 27 |
Book title |
Physiology, Psychoacoustics and Cognition in Normal and Impaired Hearing
|
Published in |
Advances in experimental medicine and biology, April 2016
|
DOI | 10.1007/978-3-319-25474-6_27 |
Pubmed ID | |
Book ISBNs |
978-3-31-925472-2, 978-3-31-925474-6
|
Authors |
Thibaud Leclère, David Théry, Mathieu Lavandier, John F. Culling |
Editors |
Pim van Dijk, Deniz Başkent, Etienne Gaudrain, Emile de Kleine, Anita Wagner, Cris Lanting |
Abstract |
The speech intelligibility index (SII) calculation is based on the assumption that the effective range of signal-to-noise ratio (SNR) regarding speech intelligibility is [- 15 dB; +15 dB]. In a specific frequency band, speech intelligibility would remain constant by varying the SNRs above + 15 dB or below - 15 dB. These assumptions were tested in four experiments measuring speech reception thresholds (SRTs) with a speech target and speech-spectrum noise, while attenuating target or noise above or below 1400 Hz, with different levels of attenuation in order to test different SNRs in the two bands. SRT varied linearly with attenuation at low-attenuation levels and an asymptote was reached for high-attenuation levels. However, this asymptote was reached (intelligibility was not influenced by further attenuation) for different attenuation levels across experiments. The - 15-dB SII limit was confirmed for high-pass filtered targets, whereas for low-pass filtered targets, intelligibility was further impaired by decreasing the SNR below - 15 dB (until - 37 dB) in the high-frequency band. For high-pass and low-pass filtered noises, speech intelligibility kept improving when increasing the SNR in the rejected band beyond + 15 dB (up to 43 dB). Before reaching the asymptote, a 10-dB increase of SNR obtained by filtering the noise resulted in a larger decrease of SRT than a corresponding 10-dB decrease of SNR obtained by filtering the target (the slopes SRT/attenuation were different depending on which source was filtered). These results question the use of the SNR range and the importance function adopted by the SII when considering sharply filtered signals. |
Mendeley readers
Geographical breakdown
Country | Count | As % |
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Unknown | 6 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 2 | 33% |
Professor | 1 | 17% |
Student > Postgraduate | 1 | 17% |
Student > Master | 1 | 17% |
Unknown | 1 | 17% |
Readers by discipline | Count | As % |
---|---|---|
Psychology | 2 | 33% |
Physics and Astronomy | 1 | 17% |
Social Sciences | 1 | 17% |
Unknown | 2 | 33% |