| 单词 | phantom circuit |
| 释义 | > as lemmasphantom circuit phantom circuit n. Telecommunications an additional circuit set up, without additional wiring, from two existing circuits (the two wires of each of the original circuits then being effectively in parallel) and able to carry signals independently of the other circuits. ΘΚΠ society > communication > telecommunication > telegraphy or telephony > [noun] > phantom circuit side circuit1842 phantom circuit1883 phantom1920 1883 G. Black in Operator & Electr. World 3 Feb. 71/1 The method of telephonic transmission was discovered by myself in 1878, while experimenting to get rid of telegraphic induction in telephones. I found that my apparatus gave me a new ‘phantom’ circuit over a telegraph wire. 1924 W. Aitken Automatic Telephone Syst. III. xlviii. 229 In using phantom or superimposed circuits on automatic systems great care must be exercised to prevent impulse and other currents in one physical circuit affecting the mate physical circuit by way of the phantom loop. 1957 W. Fraser Telecommunications v. 123 The additional circuits may be provided by utilising pairs of phantom circuits to produce other phantom circuits. 1986 E. L. Scace in T. C. Bartee Digital Communications iii. 108 A phantom circuit formed by these two wire pairs and their isolation transformers carries some dc power. < as lemmas |
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