| 摘要 |
PURPOSE:To eliminate the variation of an output level and at the same time to separate two fader levers each other to operate them independently by providing a fader signal control circuit which makes the relation between the gain of a gain control circuit K and 1-K. CONSTITUTION:The gains are varied by gain control circuits 33 and 34 for video signals supplied to video signal input terminals 31 and 32. Such video signals are transmitted to a video signal output terminal 39 via a mixing circuit 37. The signal sent from a fader volume 35 is supplied to both the circuit 33 and a fader signal control circuit 38. The circuit 38 receives the signals from fader volumes 35 and 36. When two fader levers are put close to each other, a signal is transmitted to the circuit 34 so as to maintain a relation between K and 1-K for gains of the circuits 33 and 34. In this case, the circuit 38 controls to obtain the fixed level of an output voltage although only the volume 36 has a minute shift if a grip error, etc. are detected. Thus two gains attain the relation between K and 1-K. |
