With the help of spectrograms the importance of spectral magnitude in speech signal has been highlighted in many classical studies. The other half of the spectral information, the spectral phase, is ignored following the assumption that phase is relatively less or unimportant in speech perception. In this research, an identification experiment was designed to explore the role of phase in the perception of intervocalic stop consonants in vowel-consonant-vowel (VCV) utterances. We employed an iterative algorithm to manipulate phase spectra in the hope that we can construct phonetically different utterances from the same short-time Fourier magnitude spectrum. It was shown that even for a very small analysis window, say 20 msec in length, nearly 16% of the intervocalic stop consonants were perceived as designated consonants other than the consonants from which the magnitude spectra came.
Bibliographic reference. Liu, Li / He, Jialong / Palm, GŁnther (1995): "Influence of short-time phase on the perception of stop consonants", In EUROSPEECH-1995, 2269-2272.