振幅包絡より位相誤差に鋭敏な聴覚特性の考察(一般講演B3,数理4(生体情報))

抄録

It has been reported that the maximum ana7 minimum data of the narrow-band (one octave) acoustic waveforms played a key role in the sound reproduction by using the sinusoidal interpolation between two successive extrema. Although two indices of phase and quantization errors of the extrema have closely related to the perception of sound localization, and the form of amplitude envelope, respectively, which has regarded as a principal carrier of speech waveforms, the interaction between the two has remained unclear as to which is a critical factor in the auditory cognitive system in the previous study. When the sum squared errors between an unmodified sound and the synthesized ones are mutually close, phase error of the extrema in a 3-s synthesized speech and music is larger than quantization error. Besides, Scheffe s pair test has revealed the degradation of the synthesized sounds with phase error, suggesting the cognitive superiority of phase error to noise in amplitude envelope, as well as the introduction of the two new indices sensitive to the sound quality.