Compound acoustic actuator drive circuit and portable information terminal
AssigneeNEC Corporation
InventorChiemi Takahashi
Life of this patent
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Abstract
In a signal generation circuit for a compound acoustic actuator that generates a sound and a vibration in response to a frequency of a signal input to the compound acoustic actuator, the signal generation circuit comprising a plurality of signal data stored in a memory to generate a plurality of signals having mutually different frequencies, the plurality of signals at least including a signal, a frequency of which is equal to a resonant frequency causing the compound acoustic actuator to generate the vibration, a synthesizing means to synthesize a plurality of drive signals in accordance with the plurality of signal data so as to cause the compound acoustic actuator to generate the vibration, and a sweeping means to sweep the plurality of drive signals, repeatedly.
Claims8
A signal generation circuit for a compound acoustic actuator that generates a sound and a vibration in response to a frequency of a signal input to said compound acoustic actuator, said signal generation circuit comprising:
- a plurality of signal data stored in a memory to generate a plurality of signals having mutually different frequencies, said plurality of signals at least including a signal, a frequency of which is equal to a resonant frequency causing said compound acoustic actuator to generate said vibration,
- a synthesizing means to synthesize a plurality of drive signals in accordance with said plurality of signal data so as to cause said compound acoustic actuator to generate said vibration, and
- a sweeping means to sweep said plurality of drive signals, repeatedly.
A portable information terminal having a signal generation circuit for a compound acoustic actuator that generates a sound and a vibration in response to a frequency of a signal input to said compound acoustic actuator, said signal generation circuit comprising:
- a plurality of signal data stored in a memory to generate a plurality of signals having mutually different frequencies, said plurality of signals at least including a signal, a frequency of which is equal to a resonant frequency causing said compound acoustic actuator to generate said vibration,
- a synthesizing means to synthesize a plurality of drive signals in accordance with said plurality of signal data so as to cause said compound acoustic actuator to generate said vibration, and
- a sweeping means to sweep said plurality of drive signals, repeatedly.
Dependencies are inferred from the claim text.