We investigated how spectral information contributes to the perception of Japanese consonants, using re-synthesised samples that were created by (1) gradually reducing the order of LPC analysis in the residual excited LPC vocoder; and (2) gradually flattening the spectral peak in the frequency domain. The resutls of native Japanese speakers showed that the information in LPC residuals contributes significantly, if not sufficiently, to Japanese consonant perception, and that the minimum amount of spectral information is sufficient to achieve 90
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