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Relative Contribution of Amplitude a...

Broussard, Sierra Noel.

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Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds./
Author:	Broussard, Sierra Noel.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	88 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.
Contained By:	Dissertation Abstracts International79-02B(E).
Subject:	Cognitive psychology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10634345
ISBN:	9780355413885

Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds.
Broussard, Sierra Noel.

Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 88 p.

Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.

Thesis (Ph.D.)--University of California, Irvine, 2017.

Speech processing involves analysis of complex cues in both spectral and temporal domains. This dissertation describes a set of studies that explore how speech and music, the two most complex and ecologically important types of sound, are affected by spectral degradation using a method that orthogonally and parametrically decorrelates their amplitude and phase spectra. The first study investigates how amplitude and phase information differentially contribute to speech intelligibility. Listeners performed a word identification task after hearing spectrally degraded sentences that were segmented into temporal units of varying lengths (e.g., phoneme and syllable durations) before the decorrelation process. Results showed that for intermediate spectral correlation values, segment length is generally inconsequential to intelligibility, and that intelligibility overall is more adversely affected by phase-spectrum decorrelation than by amplitude-spectrum decorrelation. The second study investigates how amplitude and phase information differentially contribute to melody discrimination and speech intelligibility to better characterize processing differences between music and speech. Listeners heard spectrally degraded melodies and performed a same-different judgement in a psychophysical discrimination task. Melody recognition was relatively unaffected by partial decorrelation of the amplitude spectrum and more resilient to loss of phase-spectrum cues for both short and long-duration analysis segments. The third study examines the effects of speaking rate and spectral degradation on speech intelligibility. Consistent with prior findings, phase spectrum cues were most useful to intelligibility at longer temporal windows of analysis, and amplitude spectrum cues at short windows. For normal rate speech, the crossover point between these two cues occurred at an estimated window size of 120 ms; i.e., amplitude-spectrum cues were more useful to intelligibility below this value and phase spectrum cues were more useful above this window size. Increasing speaking rate to twice normal rate, surprisingly seemed to have little to no effect on this crossover point. However, slowing down speaking rate shifted this crossover point to significantly longer temporal window sizes (~230 ms). Implications of these findings for cues critical to intelligibility of speech at different speaking rates, and in particular, the importance of preserving narrowband temporal envelope cues are discussed.

ISBN: 9780355413885Subjects--Topical Terms:

523881
Cognitive psychology.

Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds.
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245 1 0 $a Relative Contribution of Amplitude and Phase Spectra to the Perception of Complex Sounds.
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500 $a Source: Dissertation Abstracts International, Volume: 79-02(E), Section: B.
500 $a Adviser: Kourosh Saberi.
502 $a Thesis (Ph.D.)--University of California, Irvine, 2017.
520 $a Speech processing involves analysis of complex cues in both spectral and temporal domains. This dissertation describes a set of studies that explore how speech and music, the two most complex and ecologically important types of sound, are affected by spectral degradation using a method that orthogonally and parametrically decorrelates their amplitude and phase spectra. The first study investigates how amplitude and phase information differentially contribute to speech intelligibility. Listeners performed a word identification task after hearing spectrally degraded sentences that were segmented into temporal units of varying lengths (e.g., phoneme and syllable durations) before the decorrelation process. Results showed that for intermediate spectral correlation values, segment length is generally inconsequential to intelligibility, and that intelligibility overall is more adversely affected by phase-spectrum decorrelation than by amplitude-spectrum decorrelation. The second study investigates how amplitude and phase information differentially contribute to melody discrimination and speech intelligibility to better characterize processing differences between music and speech. Listeners heard spectrally degraded melodies and performed a same-different judgement in a psychophysical discrimination task. Melody recognition was relatively unaffected by partial decorrelation of the amplitude spectrum and more resilient to loss of phase-spectrum cues for both short and long-duration analysis segments. The third study examines the effects of speaking rate and spectral degradation on speech intelligibility. Consistent with prior findings, phase spectrum cues were most useful to intelligibility at longer temporal windows of analysis, and amplitude spectrum cues at short windows. For normal rate speech, the crossover point between these two cues occurred at an estimated window size of 120 ms; i.e., amplitude-spectrum cues were more useful to intelligibility below this value and phase spectrum cues were more useful above this window size. Increasing speaking rate to twice normal rate, surprisingly seemed to have little to no effect on this crossover point. However, slowing down speaking rate shifted this crossover point to significantly longer temporal window sizes (~230 ms). Implications of these findings for cues critical to intelligibility of speech at different speaking rates, and in particular, the importance of preserving narrowband temporal envelope cues are discussed.
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