ACOUSTIC ELEMENT DRIVING CIRCUIT

PROBLEM TO BE SOLVED: To suppress click noise generated in an acoustic element driving circuit. SOLUTION: A controller circuit 14 having detected supply of power sets an input signal Sin into a state of muting using a volume control circuit 15, and gradually releases the state of muting after a prescribed period passes. Thus, a capacitor 13 for DC cut is prevented from being charged with high voltage just after the supply of power, so that the click noise is suppressed. Moreover, the controller circuit 14 having detected turning off of power gradually mutes the input signal Sin using the volume control circuit 15 to make the input signal Sin into the state of muting before the power is started. Thus, the capacitor 13 for DC cut is prevented from being discharged from high voltage just after the turning OFF of power, so that the click noise is suppressed. COPYRIGHT: (C)2007,JPO&INPIT