| 摘要 |
PROBLEM TO BE SOLVED: To drive a speaker without using a driving amplifier with superior characteristics and acceleration feedback. SOLUTION: One voice coil 13 of a speaker having two annular magnetic gaps g1, g2, where the same magnetic flux passes and voice coils 13, 14 provided in the same formation at the magnetic gaps g1, g2 is driven by a driving amplifier, while the other voice coil 14 is driven by a deviation driving amplifier, in which an output deviation factor of the driving amplifier is generated through the input and output of the driving amplifier. The output of the driving amplifier, the output of the deviation driving amplifier, and voice coils 13 and 14 are so connected that the deviation factor of the driving amplifier included in the diving force of the voice coil 13 is canceled by the driving force of the voice coil 13 driven by the deviation driving amplifier. Then, the deviation (distortion, noise and the like) of the driving amplifier can be improved. COPYRIGHT: (C)2005,JPO&NCIPI |
