| 摘要 |
To control the amplitude of color difference signals (R-Y, B-Y), a circuit is formed by two transistors each receiving matrixed color difference signals at their emitters, the base electrodes of one of the transistors (14, 16) being connected to a source of reference voltage and the base electrodes of the other of the transistors (13, 15) being connected to a common controlled source of voltage (UG, 18) The color difference signals are then available at the collectors of the second transistors (13, 15) under controlled conditions.
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