A review of results on frequency shifts and vowel identification

Peter F. Assmann, Terrance M. Nearey


Recent studies have shown that speech remains intelligible when the spectrum envelope was shifted up or down along the frequency scale across a fairly wide range. However, intelligibility decline when the shift factor was greater than about 1.5, or less than 0.7. This paper presents evidence from a perceptual experiment and describes a model of vowel identification that accounts for the effects of frequency shifts in terms of listeners' sensitivity to statistical regularities in natural speech.


Acoustic variables measurement; Correlation methods; Linguistics; Mathematical models; Natural frequencies; Pattern recognition; Probability; Speech analysis; Speech intelligibility; Speech synthesis; Vocoders; Formant frequencies; Linear discriminant analysis; Statistical covariation; Vowel identification

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