| 摘要 |
PROBLEM TO BE SOLVED: To prevent a strange sound due to a mute activation delay and to suppress deterioration by a mute circuit in a switching amplifier.SOLUTION: A mute circuit 3 includes a control circuit 31 and a power supply circuit 32. The power supply circuit 32 supplies NAND gates X4, X5 with operating voltages ±Vdd when the control circuit 31 does not output a mute control signal. The power supply circuit 32 does not supply the NAND gates X4, X5 with operating voltages ±Vdd when the control circuit 31 outputs a mute control signal.SELECTED DRAWING: Figure 2 |
