Presentations -
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Acoustic features after tongue and mouth floor resection : Preliminary report
Saito Hiroto, Suzuki Noriko, Kitamura Tatsuya, Akagi Masato, Michi Ken-ichi
IEICE technical report. Speech
Event date： 1999.3
Acoustic characteristics of patients after tongue and mouth floor resection were investigated using computerized maximum likelihood spectrum estimation and compared with normal subjects. The following resuIts were obtained: 1) F1 was located at a higher frequency in glossectomee than that in normal subjects. 2) In the 2 to 3 kHz range, features of spectrum peaks in glossectomee showed various abnormal patterns, which were not observed in normal subjects. 3) In the 2 to 3 kHz range, variations in the spectral peak with time were observed in glossectomee, which were not observed in normal subjects. From these results it is suggested that the selection of the analysis method is very important for observing the acoustic features of glossectomee.
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Significant physical cues for speaker identification in speech spectral envelopes
KITAMURA TATSUYA, AKAGl MASATO
IEICE technical report. Speech
Event date： 1996.3
Significant physical cues for speaker identification of vowels are investigated though psychoacoustic experiments. The stimuli used for the experiments have spectral envelopes modified by the LMA analysis-synthesis system. The results lead to the following conclusions. 1) The peaks in the higher frequency band of the spectral envelopes were more significant than the valleys for speaker identification. 2) Speaker individualities mainly exist in the frequency band higher than the peak around 20 ERB rate (1740 Hz). 3) Even if these peaks were approximated by triangles whose vertex and width were same as those of the peaks, speaker individuality in the stimuli still remained. This indicates that the frequency and the bandwidth of the peaks are significant for speaker identification.
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Freqency Bands Having Speaker Individualities
Kitamura Tatsuya, Takagi Naoko, Akagi Masato
IEICE technical report. Speech
Event date： 1995.7
Frequency bands having speaker individualities in spectral envelopes of vowels are investigated through ABX test. The stimuli are synthesized by replacing the frequency bands of 0 to 10 ERB rate, 10 to 20 ERB rate and 20 to 30 ERB rate from speaker dependent spectral envelope to the spectral envelope with normalized speaker individualities. The experimental results show (1)that speaker individualities exist mainly in the higher frequency band and voice qualities can be controlled using this band of the spectral envelopes, and (2)that the larger the spectral distance of a frequency band between spectral envelope of speaker dependents and normalized spectral envelopes, the easier it will be to control the voice qualities.
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Speaker individualities in speech spectral eavelopes
Kitamura Tatsuya, Akagi Masato
IEICE technical report. Speech
Event date： 1994.3
Speaker individualities in spectral envelopes of vowels are investigated through psychoacostic experiments.The stimuli used for the experiments are spectral envelopes varied by the LMA analysis-synthesis system.The experiment results show(1)that speaker individualities exist in spectral envelopes,(2)that more detailed information of the spectral envelopes is required for speaker identification than that for vowel identification,and that(3)speaker individualities exist in higher than 22 ERB Rate(2212 Hz)remarkably and vowel characteristics exist from 12 ERB Rate(603 Hz)to 22 ERB Rate.These results suggest that speaker individualities can be contoroled respectively.