Color television image pickup device with a stripe filter

Claim 1

A color image pickup device comprising: an image pickup tube; a color stripe filter comprising a plurality of stripe groups, each stripe group comprising a plurality of stripes, said color stripe filter being arranged on said image pickup tube so that a longitudinal direction of the stripes of said color stripe filter is substantially parallel to a scanning direction of said image pickup tube; a first bandpass filter for extracting a fundamental wave component from an output of said image pickup tube; a second bandpass filter for extracting a second harmonic wave component from the output of said image pickup tube, said first and second bandpass filters being constituted by feedback type filters; an adder for adding the outputs of said first and second bandpass filters; and color multiplexed signal obtaining means for obtaining a color multiplexed signal by multiplexing an output signal of said adder in a sequence corresponding to a direction perpendicular to said scanning direction for every one stripe group, said first bandpass filter comprising a first coefficient multiplier supplied with the output of said color stripe filter, a first adding circuit supplied with an output of said first coefficient multiplier, a first delay circuit supplied with an output of said first adding circuit, a first subtracting circuit for subtracting the output of said first adding circuit from an output of said first delay circuit and a second coefficient multiplier supplied with an output of said first subtracting circuit and for supplying an output thereof to said first adding circuit, said second bandpass filter comprising a third coefficient multiplier supplied with the output of said color stripe filter, a second adding circuit supplied with an output of said third coefficient multiplier, a second delay circuit supplied with an output of said second adding circuit, a second subtracting circuit for subtracting the output of said second adding circuit from an output of said second delay circuit and a fourth coefficient multiplier supplied with an output of said second subtracting circuit and for supplying an output thereof to said second adding circuit, the outputs of said first and second subtracting circuit being supplied to said adder as the outputs of said first and second bandpass filters, first and second delay times of said first and second delay circuits being set so that said first and second subtracting circuits perform subtraction between signals having a phase difference of approximately 180°.