The tests measured range of hearing over low, mid and high noise frequencies.

这些测试测量了对低、中、高频率噪声的听觉范围。

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These high intensity ultrasonic sound waves (20 ~ 65khz) are out of the range of hearing of humans are most household pets, but pests.

这些高强度的超声波(20 ~ 65khz)不在人类和大部分家养宠物的听觉范围内，但能被害虫听到。

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The cones of larger loudspeakers used in traditional public-address systems vibrate more slowly, making them better suited for sounds in the range of human hearing.

传统播音系统使用的大型扩音器中的椎体振动较为缓慢，使声音更加适合人类听觉范围。

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The tests measured range of hearing over low, mid and high noise frequencies.

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So if you blast inaudible ultrasonic frequencies of 100 kilohertz and 101 kilohertz, you get an inaudible 201 kilohertz overtone plus an undertone of 1 kilohertz that is well inside the range of hearing.

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HSS, by contrast, shoots tightly focused waves of ultrasound (meaning it exceeds the frequency range of human hearing).

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