TITLE

Perceptual Consequences of Changes in Vocoded Speech Parameters in Various Reverberation Conditions

AUTHOR(S)
Drgas, Szymon; Blaszak, Magdalena A.
PUB. DATE
August 2009
SOURCE
Journal of Speech, Language & Hearing Research;Aug2009, Vol. 52 Issue 4, p9445
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: To study the perceptual consequences of changes in parameters of vocoded speech in various reverberation conditions. Method: The 3 controlled variables were number of vocoder bands, instantaneous frequency change rate, and reverberation conditions. The effects were quantified in terms of (a) nonsense words' recognition scores for young normal-hearing listeners, b) ease of listening based on the time of response (response delay), and (c) the subjective measure of difficulty (10-degree scale). Results: It has been shown that the fine structure of a signal is a relevant cue in speech perception in reverberation conditions. The results obtained for different number of bands, frequency-modulation cutoff frequencies, and reverberation conditions have shown that all these parameters are important for speech perception in reverberation. Conclusions: Only slow variations in the instantaneous frequency (<50 Hz) seem to play a critical role in speech intelligibility in anechoic conditions. In reverberant enclosures, however, fast fluctuations of instantaneous frequency are also significant.
ACCESSION #
43421315

 

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