When sound frequency increases, the sound absorbent coefficient of porous aluminum alloy increases.

当声波频率增加时，多孔铝合金的吸声系数增大。

youdao

Small, low impedance, the high pressure resistance electric capacity, mainly applies to the sound frequency dividing circuit.

小型，低阻抗，高耐压电容，主要应用于音响分频电路。

youdao

Extracting the sound frequency features is vital for the noise diagnosis expert system to detect the gear processing error in a transmission.

汽车变速器齿轮制造缺陷声频特征的提取，是汽车变速器噪声故障诊断专家系统准确诊断齿轮制造缺陷的关键。

youdao

AM radio can be sent over larger distances, but the quality of the sound is not as good as a later kind of radio signal processing, called frequency modulation.

VOA: special.2010.12.08

Maybe you can put the frequency of the higher pitches as high so you can detect the sound quicker and That's it exactly.

大概是把频率调到更高的音高后,就能更敏捷地感觉到声音的变化,而那就是原因了

耶鲁公开课 - 聆听音乐课程节选

Because of the distance that low-frequency sound waves can travel under water, a set of four ships emitting sound at 235 decibels could monitor 80% of the world's oceans for submarines.

ECONOMIST: The American navy may soon have a whale of a problem

Such damage has long been suspected, since whales employ their own form of sonar for navigating and hunting, and also use sonar-like low frequency sound for communicating with each other (so-called whale song).

ECONOMIST: Quiet, please. Whales navigating

There is no irritating barking or high-frequency sound.

BBC: New TV channel for dogs sets tails wagging in Israel