Archives of Acoustics, 32, 4(S), pp. 325-330, 2007

Perceptual consequences of change in vocoded speech parameters for various reverberation conditions

Szymon Drgas
Adam Mickiewicz University, Institute of Acoustics, Umultowska 85, 64-614 Poznań
Poland

Magdalena Błaszak
Adam Mickiewicz University, Institute of Acoustics, Umultowska 85, 64-614 Poznań
Poland

The perceptual consequence of change in parameters of vocoded speech for various reverberation
conditions has been examined. The three controlled variables were: number of
bands, instantaneous frequency changes rate and reverberation conditions. The effects were
quantified in terms of: (a) non-words’ recognition scores for young normal-hearing listeners,
(b) “ease of listening” based on the time of reaction (response delay) and (c) the subjective
measure of difficulty (ten-degree scale). The results have shown that the fine structure information
is a relevant cue in speech perception in reverberation conditions. It has also been
observed that only the slow variations of instantaneous frequency are critical in perception.
A good correlation between all subjective measures considered was found in this study.
Keywords: vocoder, speech perception, reverberation conditions.
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