Newman Rochelle S, Chatterjee Monita, Morini Giovanna, Remez Robert E
Department of Hearing and Speech Sciences, 0100 Lefrak Hall, University of Maryland, College Park, Maryland 20742, USA
Boys Town National Research Hospital, 555 North 30th Street, Omaha, Nebraska 68131, USA
J Acoust Soc Am. 2015 Sep;138(3):EL311-7. doi: 10.1121/1.4929731.
Recent findings suggest that development changes the ability to comprehend degraded speech. Preschool children showed greater difficulties perceiving noise-vocoded speech (a signal that integrates amplitude over broad frequency bands) than sine-wave speech (which maintains the spectral peaks without the spectrum envelope). In contrast, 27-month-old children in the present study could recognize speech with either type of degradation and performed slightly better with eight-channel vocoded speech than with sine-wave speech. This suggests that children's identification performance depends critically on the degree of degradation and that their success in recognizing unfamiliar speech encodings is encouraging overall.
最近的研究结果表明，发育会改变理解退化语音的能力。学龄前儿童在感知噪声声码语音（一种在宽频带上整合振幅的信号）方面比正弦波语音（保持频谱峰值但没有频谱包络）表现出更大的困难。相比之下，本研究中的27个月大的儿童能够识别这两种类型退化的语音，并且在识别八通道声码语音时的表现略优于正弦波语音。这表明儿童的识别表现关键取决于退化程度，并且他们在识别不熟悉语音编码方面的成功总体上令人鼓舞。
