| Summary: | 碩士 === 國立陽明大學 === 復健科技輔具研究所 === 94 === Two listening experiments were designed to evaluate the interaction of spectral bands in Mandarin speech recognition. The experiments aimed to identify if there is any synergetic and redundant effect of spectral frequency bands in monosyllabic Mandarin words. In experimentⅠ, twenty normal hearing subjects listened monosyllables through 20 band-pass filters, which have center frequency ranging from 125 to 10000 Hz, 1/3 octave bandwidth and filter slope of 100 dB/octave. The purpose of experiment I was to identify the intelligibility of spectral frequency bands in Mandarin speech. In experiment Ⅱ, 20 subjects listened monosyllables with the combination of 2 or 3 individual bands for investigating the synergetic or redundant interactions. The perceptual outcomes of the second experiment were compared to the product of combined 2 or 3 bands. To identify what kind of the interaction within spectral frequency bands in Mandarin words. The results indicated that the contribution of each band to recognition of Mandarin monosyllables was not independent, and the recognition of Mandarin tones, consonants and vowels showed different redundant and synergetic effects.
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