| 摘要 |
PURPOSE:To attain ease of convenience, by controlling a means for controlling the gain of high and low frequency signals out of gain control means with a single circuit means simultaneously. CONSTITUTION:In emphasizing (or attenuating) the high frequency only, a knob of a variable resistor 10 is turned to change a DC bias voltage to a high frequency gain controlling circuit 6. In emphasizing (or attenuating) the high and low frequency signals at the same time, the high and low frequency signals are controlled at the same time by turning a knob of a voltage variable resistor 15 and applying a voltage more than the voltages given from variable resistors 10, 11 through diodes 16, 17 to the circuit 6 and a low frequency gain controlling circuit 7 at the same time via diodes 18, 19. |
