Signal processing circuit

H - Electricity – 04 – N

Patent

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Details

352/18, 352/20.8

H04N 9/71 (2006.01)

Patent

CA 1193360

- 25 - Abstract of the Disclosure DC control signals responsive to ACC voltages are applied to a color signal amplifier, to which recording and reproducing color signals are applied, to control the operation of the color signal amplifier to recording or reproducing mode. Such control is attained by using color killer signal responsive to mode changeover and ACC detector signals which serve to assign the color signal amplifier to recording or reproducing mode. Color signals are obtained from the output terminal of the color signal amplifier in both modes. In the case of recording mode, essentially undesirable recording color signals appearing to the output terminal of the color signal amplifier are by-passed by a low-pass filter, and only ACC detector voltages which are used as color killer signals are supplied to a mixer circuit which mixes brightness and color signals to generate composite color signals to be recorded. This recording signal mixer circuit serves to restrain, if necessary, low frequency converted color signals from being supplied from the recording signal mixer circuit to a recording head responsive to color killer signals. In the case of reproducing mode, color signals appearing to the output terminal of the color signal amplifier are supplied to a reproducing mixer which composes composite color signals to be reproduced from brightness and color signals to be reproduced. Input signals to the color - 26 - signal amplifier are treated at the time of recording mode in such a way that color killer voltages are superposed on essentially undesirable recording color signals to extract only color killer voltages on the output terminal side of the color amplifier, thus allowing the circuit, which functions as the color amplifier at the time of reproducing mode, to serve as the circuit for treating color killer signals at the time of recording mode, or making the function of the single circuit different in reproducing and recording modes,

371819

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