| 摘要 |
PURPOSE:To eliminate harmonic disturbance due to a clock generating circuit by stopping the operation of the clock generating circuit when a slave picture plane is not displayed on a master picture plane. CONSTITUTION:A signal inputted from an antenna 11 is demodulated into a video/sound signal, and the demodulated signal and a video/sound signal from other video equipment 14 are fed to a switching circuit 16. The circuit 16 outputs the 1st signal forming the master picture plane and the 2nd signal forming the slave picture plane. A signal passing through a chrominance/video signal processing circuit 24 is written in a memory 26 by a slave picture plane synchronizing clock circuit 29 and the signal from the memory 26 is read by a master picture plane clock circuit 31 in synchronizing with a synchronizing circuit 18. A memory controller 30 stops the operation of the circuits 29, 31 when the slave picture plane is not driven.
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