ACOUSTIC REPRODUCTION DEVICE

摘要

PROBLEM TO BE SOLVED: To realize a reproduction sound with high quality without cross modulation by extracting only a distortion component of cross modulation distortion of the reproduction sound through comparison of a current flowing to a voice coil with a current in no distortion state and negatively feeding back the extracted component to an amplifier driving a dynamic speaker so as to reduce only the distortion current component. SOLUTION: A voltage of a 1st signal generating means 103 that generates the voltage proportional to a current flowing to a dynamic speaker 101 is compared with a voltage of a 2nd signal generating means 104 that generates the voltage proportional to a current flowing to the dynamic speaker 101 driven at a low power, and the comparison result is amplifier and the amplified signal is fed back to an amplifier 102 driving the dynamic speaker 101 to prevent cross modulation distortion resulting from a change in a voice coil impedance generated when the speaker is driven at a large amplitude.