| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce package costs, mounting area, and mounting costs or the like without increasing the number of components, and to reduce a, so called, pop noise. <P>SOLUTION: An effect on/off control signal inputted from the outside is applied through a current switch 5 to an integrated circuit 9, and an effect value control signal inputted from the outside is applied through an AND circuit 6 and a digital/analog converter 8 to the integrated circuit 9 in the direction opposite to the direction of the output currents of the current switch 5. Thus, it is possible to prevent the mutual interference of the two signals, and to smooth each signal change. The effect on/off control signal is applied through a comparator 7 to the prescribed input terminal of a switch 4 for opening and closing the switch 4, and the effect value control signal is current/voltage converted by an operating amplifier 10, and applied to the prescribed input terminal of an effect adjusting unit 3 for controlling the effect value of the effect adjusting unit 3 for adjusting the value of effects to the input signal. <P>COPYRIGHT: (C)2004,JPO |
