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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 …