| 单词 | frequency shift |
| 释义 | > as lemmasfrequency shift frequency shift n. used attributive (also absol.) to designate a method of radio telegraphy in which the carrier frequency takes either of two approximately equal values according as the signal is a ‘space’ or a ‘mark’. ΘΚΠ society > communication > telecommunication > radio communications > [adjective] > method of receiving or detecting signal heterodyne1908 autodyne1918 autoheterodyne1919 superheterodyne1920 neutrodyning1924 superhet1926 homodyne1928 frequency shift1944 1944 Electronics Nov. 126/2 The bandwidth required by frequency-shift transmission is no greater than that required by the carrier make and break system. 1944 Electronics Nov. 127/3 Frequency shift can result in a much lower bandwidth than carrier make-break. 1959 Chambers's Encycl. XI. 471/1 A method of keying which is extensively employed with teleprinters is that known as frequency-shift (or carrier shift), in which the sender radiates continuously. < as lemmas |
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