| 摘要 |
PURPOSE:To suppress a noise preventing overmodulation from being generated, by transmitting a luminance signal after applying preemphasis on the high frequency area of the luminance signal corresponding to the amplitude of a low frequency component. CONSTITUTION:A signal inputted from a color camera, etc., is inputted to a matrix circuit 1, and the luminance signal Y is generated, and is separated to three systems. In first system, first signal is obtained by processing the signal Y with a flat high frequency area. In second system, second signal is obtained by processing the signal Y with a pre-emphasis frequency characteristic by which a gain is raised according to the increase of a frequency at the high frequency area. In third system, a mixing ratio K of the first signal to the second signal is calculated by a K component generation circuit 8 based on the low frequency component of the signal Y. And the first signal and the second signal are synthesized in a form of the third signal=(first signal)X(1-K)+(second signal)XK, then, the third signal is generated, and broadcasting is performed setting the third signal as the luminance signal.
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