| abstract |
An acoustic apparatus comprises a resonator, a vibrator, and a vibrator drive circuit for an improved bass sound reproduction. The resonator has a resonance radiation unit for radiating an acoustic wave by resonance, and the vibrator has a diaphragm constituting a part of the resonator and disposed in the resonator. The vibrator drive circuit for driving the vibrator has a negative impedance component in an output impedance, and a reaction from the resonator to the diagram is canceled upon driving of the resonator. Accordingly, the presence of the vibrator is invalidated as viewed from the resonator, and the vibrator and the resonator can be independently designed. As a result, the resonator can be realized in a compact size, and the resonance acoustic wave can be radiated powerfully. |