| 摘要 |
<p>The circuit for compensating the image contour of vertical direction in NTSC television comprises delay circuits (1,2) delaying horizontal period as much as one (1H), mixers (M1-2) obtaining difference between bright signals of first and last lines, level rectifiers (3,4) filtering the difference signal having certain level, memories (5,6) reading the brightness data two times faster than writing, an analog switch (SW) providing control signal (CTB) formed by horizontal synch. signal for double scanning, a multiplier (7) adjusting the output peaking level of the analog switch, and a mixer (M3) providing the compensated contour signal.</p> |
