Sound emitting apparatus and blade noise reduction apparatus
AssigneeKabushiki Kaisha Toshiba
InventorTatsuhiko Goto
Life of this patent
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Abstract
According to one embodiment, a sound emitting apparatus includes an elastic member, three or more excitation actuators, and a control circuit. The elastic member has an annular shape. The excitation actuators are arranged at a predetermined angular interval on the elastic member and are configured to apply vibration to the elastic member. The control circuit is configured to generate drive signals for driving the three or more excitation actuators. There is a phase difference between drive signals for two excitation actuators separated by the predetermined angular interval, the phase difference depending on an order of a Lobe mode being a vibration mode excited on the elastic member and the predetermined angular interval.
Claims10
A sound emitting apparatus comprising:
- an elastic member having an annular shape;
- three or more excitation actuators arranged at a predetermined angular interval on the elastic member and configured to apply vibration to the elastic member to excite a vibration mode on the elastic member;
- and
- a control circuit configured to generate drive signals for driving the three or more excitation actuators, wherein there is a phase difference between drive signals for two excitation actuators separated by the predetermined angular interval to rotate the vibration mode, the phase difference depending on an order of a lobe mode being the vibration mode excited on the elastic member and the predetermined angular interval.
Dependencies are inferred from the claim text.