PURPOSE:To permit responses after automatically judging times of receiving TV signals through a standard system and through a high definition TV broadcasting by utilizing synchronous/asynchronous state signals which are taken out of phase lock loop circuits. CONSTITUTION:Video signal V1 which are input through an input part 11 are fed to a high definition video signal processing part 12 as well as the phase lock loop PLL circuits 120 which are included in the above part 12 and also are fed to a standard system video signal processing part 16. The PLL circuits 120 reproduces a system lock as well as horizontal and vertical synchronous signals at an inside of a receiver and outputs the synchronous/asynchronous state signal S1. The signal S1 together with a video signal V11 from the processing part 12 is input in a signal changeover part 13. And scanning lines of the signal fed to the processing part 16 are converted and a video signal V21 is input in the signal changeover part 13. Responding to the signal S1, the changeover part 13 selects either one of the signals V11 and V21. Thus, two TV signals in standard and high definition systems are decided automatically, the response can be done accordingly.
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