声频范围
Any Bell Labs engineer would be familiar with the idea of reducing the frequency range of speech, since the telephone cut off sound above 4000 Hz.
贝尔实验室的任何一个工程师,对降低声音的频率范围都很熟悉,因为电话会削去4000Hz以上的声音。
Frequency spectrum analysis of sound radiation from a range hood fan is combined with auditory feature for abnormal sound fault diagnosis of a range hood.
对油烟机风机辐射噪声进行频域特征分析、结合人工听觉判断油烟机异音故障。
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