When all the instruments had been checked out,the pilot signalled that he was ready for takeoff.
所有仪表都检查过之后,驾驶员发出起飞准备就绪的信号。
Pilot signal
英语例句库
原声例句
世界奇趣图谱
The pilot signals an evac helicopter that it is time to move in.
飞行员向一架撤离直升机发出信号， 表示是时候撤离了。
英语百科
Pilot signal
In telecommunications, a pilot signal is a signal, usually a single frequency, transmitted over a communications system for supervisory, control, equalization, continuity, synchronization, or reference purposes.
In FM stereo broadcasting, a pilot tone of 19 kHz indicates that there is stereophonic information at 38 kHz (19×2, the second harmonic of the pilot). The receiver doubles the frequency of the pilot tone and uses it as a phase reference to demodulate the stereo information.
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