LUMINANCE SIGNAL/CHROMINANCE SIGNAL SEPARATION CIRCUIT AND LUMINANCE SIGNAL/CHROMINANCE SIGNAL SEPARATION CIRCUIT UNIT

摘要

PURPOSE: To separate luminance signals and chrominance signals at a low cost by providing a comb line filter for taking out the chrominance signals from composite video signals and a band elimination filter for taking out the luminance signals. ;CONSTITUTION: The composite video signals are inputted from an input terminal 11, impedance-matched by a transistor 14 and impressed to a resistor 15. The comb line filter is constituted of a glass delay line 16 and a capacitor 17. The comb line filter forms a comb line passing band in a color sub carrier wave frequency, the luminance signals are removed and the chrominance signals are outputted to an output terminal 20a. Also, the band elimination filter is constituted of the capacitor 18 and an inductor 19. The band elimination filter removes the chrominance signals by setting a resonance point near the color sub carrier wave frequency and the luminance signals are outputted to the output terminal 20b. Thus, cross-color characteristics and resolution are improved, the number of parts is made almost half and the cost is reduced.;COPYRIGHT: (C)1996,JPO