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单词 pilot signal
释义

pilot signaln.

Brit. /ˈpʌɪlət ˌsɪɡnl/, U.S. /ˈpaɪlət ˌsɪɡn(ə)l/
Origin: Formed within English, by compounding. Etymons: pilot n., signal n.
Etymology: < pilot n. + signal n.
1. Nautical. A signal to request a pilot or to indicate that a pilot is on board a vessel, in the form of a recognized flag or a distinctive light. Cf. pilot flag n. at pilot n. and adj. Compounds 2. Now rare.
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1844 Times 14 Sept. 7/1 If the pilot signal is flying at the top, pilots are always to be had, but the signal will be hauled down when they are all employed.
1873 Flags Maritime Nations (U.S. Bureau of Navigation) Pl. I United States of America..Union Jack. Worn at Main, and in bow of boats, when the Secretary of the Navy is on board, at the fore as Pilot Signal.
1918 Amer. Jrnl. Internat. Law 12 17 A vessel..flying her national colors, together with International Code number and pilot signal.
1939 Times 27 June 19/6 It was stated that Tattie..failed to accept a pilot who offered his services and that he did not display a pilot signal.
2.
a. An electrical warning signal (see quot. 1926).
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1926 Gloss. Electr. Terms (Brit. Engin. Stand.) 170 Pilot signal, an automatically operated supervisory signal which indicates a change from normal in one or more circuits, signals, or other devices.
b. Telecommunications. = pilot n. 8.
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society > communication > telecommunication > [noun] > signal > types of
pilot1935
back scatter1957
pilot signal1968
1968 U.S. Patent 3,414,687 1 Pilot signals transmitted by the transmitting station are separated in the corresponding final stations to produce separate control signals.
1974 H. Bursten Questions & Answers about Tape Recording (1975) xv. 194 The FM stereo broadcast contains a 19 kHz pilot signal.
2003 Wireless Communications & Mobile Computing 3 743 In CDMA systems, existence of large number of equally strong pilot signals is not desirable.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1844
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