Perceptual Consequences of Changes in Vocoded Speech Parameters in Various Reverberation Conditions 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 ... Article
Article  |   August 2009
Perceptual Consequences of Changes in Vocoded Speech Parameters in Various Reverberation Conditions
 
Author Affiliations & Notes
  • Szymon Drgas
    Adam Mickiewicz University, Poznan, Poland
  • Magdalena A. Blaszak
    Adam Mickiewicz University, Poznan, Poland
  • Contact author: Magdalena A. Blaszak, Adam Mickiewicz University, Physics, Umultowska Street 85 Poznan 61-614, Poland. E-mail: blasaku@gmail.com.
  • © 2009 American Speech-Language-Hearing AssociationAmerican Speech-Language-Hearing Association
Article Information
Speech, Voice & Prosody / Hearing
Article   |   August 2009
Perceptual Consequences of Changes in Vocoded Speech Parameters in Various Reverberation Conditions
Journal of Speech, Language, and Hearing Research, August 2009, Vol. 52, 945-955. doi:10.1044/1092-4388(2009/08-0068)
History: Received March 28, 2008 , Accepted October 29, 2008
 
Journal of Speech, Language, and Hearing Research, August 2009, Vol. 52, 945-955. doi:10.1044/1092-4388(2009/08-0068)
History: Received March 28, 2008; Accepted October 29, 2008
Web of Science® Times Cited: 2

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.

Acknowledgments
The authors are grateful to Aleksander Sek for his helpful comments on an earlier draft of this article and to all listeners who took part in the experiments.
Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access