| 摘要 |
PROBLEM TO BE SOLVED: To reduce popping noises without adding such a circuit as to switch the output of a power amplifier.SOLUTION: Between the connecting point of a plurality of resistors 12a, 12b generating a reference voltage and a ground terminal, a capacitor 16 is provided for delaying the rising time of the reference voltage when starting power supply to a power supply terminal. Further, a sounding signal is raised to the same level as the reference voltage so that a variation in differential voltage between the reference voltage in starting power supply to the power supply terminal and the voltage of the sounding signal is settled within a predetermined range. |
