Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, 901 South Sixth Street, Champaign, Illinois 61820,
J Acoust Soc Am. 2019 Dec;146(6):EL496. doi: 10.1121/1.5140032.
Speech energy beyond 8 kHz is often audible for listeners with normal hearing. Limits to audibility in this frequency range are not well described. This study assessed the maximum audible low-pass cutoff frequency for speech, relative to full-bandwidth speech. The mean audible cutoff frequency was approximately 13 kHz, with a small but significant effect of talker sex. Better pure tone thresholds at extended high frequencies correlated with higher audible cutoff frequency. These findings demonstrate that bandlimiting speech even at 13 kHz results in a detectable loss for the average normal-hearing listener, suggesting there is information regarding the speech signal beyond 13 kHz.
对于听力正常的听众来说，8 kHz 以上的语音能量通常是可听的。但在这个频率范围内的可听度限制还没有很好地描述。本研究评估了相对于全带宽语音的言语最大可听低通截止频率。可听截止频率的平均值约为 13 kHz，说话者性别的影响很小但很显著。在扩展高频时更好的纯音阈值与更高的可听截止频率相关。这些发现表明，即使在 13 kHz 进行语音带宽限制，也会导致平均正常听力听众可察觉的损失，这表明 13 kHz 以上的语音信号中存在信息。
