英语词汇“front porch”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

7. Television. In a video signal: either of the two periods of line blanking immediately before and after the line-synchronizing pulse (in full front porch, back porch respectively).

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

1941 Proc. IRE 29 307/1 The difference between 0·06H and 0·07H, namely 1 per cent of H, is the ‘front porch’ of the pedestal.

1953 S. W. Amos & D. C. Birkinshaw Television Engin. I. ii. 32 The period of blanking level immediately following the line-sync signal..is termed the back porch.

1984 J. Dunlop & D. G. Smith Telecommunications Engin. xi. 361 In the absence of the front porch the time taken for the video signal to drop to the triggering level would vary with the amplitude of the luminance signal just before the leading edge of the synchronizing pulse.

1992 IEEE Trans. Broadcasting 38 19 Either algorithm used in a hybrid clamping arrangement results in..the ability to tie the back porch or sync tip to a predetermined digital output code.

单词	front porch
释义	> as lemmas front porch 7. Television. In a video signal: either of the two periods of line blanking immediately before and after the line-synchronizing pulse (in full front porch, back porch respectively). 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 1941 Proc. IRE 29 307/1 The difference between 0·06H and 0·07H, namely 1 per cent of H, is the ‘front porch’ of the pedestal. 1953 S. W. Amos & D. C. Birkinshaw Television Engin. I. ii. 32 The period of blanking level immediately following the line-sync signal..is termed the back porch. 1984 J. Dunlop & D. G. Smith Telecommunications Engin. xi. 361 In the absence of the front porch the time taken for the video signal to drop to the triggering level would vary with the amplitude of the luminance signal just before the leading edge of the synchronizing pulse. 1992 IEEE Trans. Broadcasting 38 19 Either algorithm used in a hybrid clamping arrangement results in..the ability to tie the back porch or sync tip to a predetermined digital output code. extracted from porchn. < as lemmas
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> as lemmas