u00d7 3 58 14 32 mhz for the ntsc color television system and with the frequency 4 fsc 4 u00d7 4 43 17 72 mhz for the pal color television system the color television system determining circuit 14 determines a color television system based on the digital video signal output from the down sampling circuit 13 the color television system determining circuit 14 is also a switching circuit for switching filter characteristics of the digital lpf 12 the sampling frequency of the a d converter 11 and the sampling frequency of the down sampling circuit 13 based on the color television system determination result the color television system determining circuit 14 determines the color television system for example as the ntsc system the pal system the secam system or the like or determines whether or not the signal is component signal the determination of the color television system may be carried out on the basis of the frequency of the burst signal a field frequency the frequency fsc and a phase of a horizontal line if the frequency fsc is 3 58 mhz for example the color television system is the ntsc system and if the frequency fsc is 4 43 mhz the color television system is the pal system the color television system determining circuit 14 determines the color television system to send a color television system determination signal representing the determined color television system to the clock generation pll 15 and the digital lpf 12 the clock generation pll 15 generates a clock of the first clock frequency based on the color television system determination signal output from the system determining circuit 14 the a d converter 11.