一个普遍在机翼上的装置，当起飞和降落时，发出脉冲性的光。

One popular device pulses powerful lights on an aircraft's wings during take-off and landing.

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并将生成信号经低通滤波器处理，从而最终得到了一个能够充分反映电视图像脉冲性、频率、幅度和带宽特点的较为逼真的信号波形。

After the signal is processed through a low-pass filter, a very realistic waveform is obtained which can show pulsed nature, frequency, amplitude and bandwidth of television picture signals.

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有所不同的是，这种激光器与其它脉冲激光器完全相反：在大多数的时间里它是打开着的，但它会周期性的短暂自动关闭。

What is unusual is that this laser is the exact inverse of most pulsed lasers: it's on most of the time, but periodically turns itself off for a short time.

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