Color signal processing device

Details Color signal processing device Color signal processing device

H - Electricity

04

N

352/18

H04N 9/83 (2006.01) H04N 9/793 (2006.01)

Patent

CA 1164999

Abstract of the Disclosure In the recording operation of a video recorder, a color signal (3.58 MHz) is frequency-converted to a low frequency converted color signal (688 kHz) by a color signal processing device. In the reproducing operation of the video tape recorder, the regenerative low fre- quency converted color signal (688 kHz) is reconverted to the color signal of original frequency (3.58 MHz) by the color signal processing device. The signal (3.58 MHz or 688 kHz) which has passed a switching circuit is gain-controlled by a color signal amplifier and is input to a balanced modulator. A converting signal (F03 = 4.27 MHz) is also input to the balanced modulator. The output of the balanced modulator is obtained as a frequency-converted signal (688 kHz or 3.58 MHz) through a low-pass filter or a band-pass filter. The converting signal (F03 = 4.27 MHz) is obtained by balanced modulation, at a second balanced modulator, of an oscillation output (3.58 MHz) of a first voltage controlled oscillator and a divided output (fO2 = 688 kHz) of a divider for dividing the output of a second voltage controlled oscillator.

371801

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