Matsuo Ikuo, Ueda Kazuo, Nakajima Yoshitaka
Department of Information Science, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, 981-3193, Japan.
Department of Human Science/Research Center for Applied Perceptual Science/Research and Development Center for Five-Sense Devices, Kyusyu University, 4-9-1 Shiobaru Minami-ku, Fukuoka 815-8540,
J Acoust Soc Am. 2020 Jun;147(6):EL523. doi: 10.1121/10.0001414.
The intelligibility of chimeric locally time-reversed speech was investigated. Both (1) the boundary frequency between the temporally degraded band and the non-degraded band and (2) the segment duration were varied. Japanese mora accuracy decreased if the width of the degraded band or the segment duration increased. Nevertheless, the chimeric stimuli were more intelligible than the locally time-reversed controls. The results imply that the auditory system can use both temporally degraded speech information and undamaged speech information over different frequency regions in the processing of the speech signal, if the amplitude envelope in the frequency range of 840-1600 Hz was preserved.
对嵌合式局部时间反转语音的可懂度进行了研究。（1）时间退化频段与非退化频段之间的边界频率以及（2）片段时长均有所变化。如果退化频段的宽度或片段时长增加，日语音节准确率会降低。然而，嵌合式刺激比局部时间反转的对照更易懂。结果表明，如果840 - 1600赫兹频率范围内的幅度包络得以保留，听觉系统在语音信号处理过程中可以利用不同频率区域的时间退化语音信息和未受损语音信息。
