By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

通过计算信号往返需要的时间，仪器可测定差距高度。

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Virtual instruments is a combination product of the digital signal processing and computer technology, generally composed of hardware platforms and software applications.

虚拟仪器是数字信号处理与计算机技术相结合的产物，一般由硬件平台和应用软件两大部分构成。

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The use of instruments and control systems based on computers or microprocessors is forcing increased use of this type of signal.

基于计算机或微处理器的仪器或控制系统的应用正推动这类信号的应用不断增加。

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They emitted so much radio-frequency interference that Mr. Clark struggled to get a clear signal for the band's wireless instruments and in-ear monitors.

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The weak signal can cause a ship's instruments to gradually drift out of true, without setting off any alarms, leaving the ship in a different position to where it "thinks" it is.

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By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

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