该设备还能收听跨越17个八度音阶的声频，其音调范围远高于蚊子的蜂鸣，而远低于低沉的雾角。

It can also hear sound frequencies across a span of 17 octaves, spanning pitches far higher than the whine of a mosquito and far lower than a rumbling foghorn.

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他们发现语音信号通常都是低沉的，而音乐片段的音调范围却很广泛；二者都会随着时间的推移有不同的变化。

They found that speech signals are normally low-pitched and musical clips have a wide range of pitches; both vary only gradually over time.

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加大功率，就能发出一种警告的音调，这种音调非常之大，在它的所及范围之内的任何人听到都只能捂起耳朵逃跑。

Crank up the power, and it can emit a warning tone so loud that anyone in its path would have no choice but to cover their ears and run.

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