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.
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: Accepted 29 Oct 2008 , Received 28 Mar 2008
Journal of Speech, Language, and Hearing Research August 2009, Vol.52, 945-955. doi:10.1044/1092-4388(2009/08-0068)
History: Accepted 29 Oct 2008 , Received 28 Mar 2008

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.

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