| 单词 | picture frequency |
| 释义 | > as lemmaspicture frequency picture frequency n. Television †(a) (the frequency of) a picture signal; (b) the number of times per second that a complete television image is scanned or transmitted. ΘΚΠ society > communication > broadcasting > television > visual element > [noun] > signals, types, or parts of picture frequency1926 picture signal1927 black level1935 line frequency1936 pedestal1937 line scan1938 picture black1938 white level1938 porch1941 test signal1945 spot wobble1950 luminance1953 1926 Wireless World 5 May 645/1 The same wavelength carries both the picture frequency, from which the received photograph is built up, and the synchronism frequency which controls the motors. 1935 Discovery Sept. 277/2 They [sc. television pictures] are bright, steady (having regard to picture frequency). 1953 S. W. Amos & D. C. Birkinshaw Television Engin. I. i. 15 The picture frequency..must be high enough to give the impression of natural movement and to minimise flicker. 1987 Which Video? Jan. 15/3 In preparing the video signal for modulation it is standard practice to pre-emphasise the higher picture frequencies. < as lemmas |
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