MUTE CONTROL CIRCUIT

摘要

PROBLEM TO BE SOLVED: To simplify the control circuit and to effectively eliminate switching noise by using a charging/discharging signal generating section so as to control mute operation of lots of current control amplifiers CCA. SOLUTION: A charging/discharging signal generating section 100 that receives positive and negative control pulses PP, PN generated by a pulse generating section receiving mute signals generates a signal CV to charge/ discharge a capacitor C and switching control signals CS, PO, ON, OP according to mute ON/OFF. Control sections control mute with current signals 101 -10n obtained through voltage/current conversion by a conversion section 200 receiving the signal CV and switching signals SW1, SW2 generated by a switching signal generating section 150 with the switching control signals. Thus, a single pop noise elimination LPF at mute ON/OFF is used to make efficient mute control at each output terminal and the total number of chip connection pins is reduced.