Complex sound exciter drive circuit and portable information terminal

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.

Description

technical field [0001] The present invention relates to a composite acoustic actuator driving circuit suitable for use in a portable information terminal in which there is a variation in the resonance frequency of the composite acoustic actuator. Background technique [0002] The composite acoustic exciter generates vibration and sound using the working principle of a dynamic speaker, and is used in portable information terminals such as cellular phones to generate sound or vibration when a call is received. The composite acoustic actuator has a resonant frequency corresponding to sound and a resonant frequency corresponding to vibration. Generally, when a signal whose frequency is equal to a low resonance frequency is input, a composite acoustic actuator works as a vibrating body, and when a signal whose frequency is equal to a high frequency is input, a composite acoustic actuator works as an acoustic generator. In both cases, both vibration and sound are used to notify t...

AI Technical Summary

Problems solved by technology

[0006] Therefore, if Figure 12 shown in Figure 12 In the configuration shown, the signal generator 1 generates an electrical signal of a predetermined frequency, the amplifier 2 amplifies the electrical signal, and the amplified signal is input to the composite acoustic exciter 3 to generate sound or vibration, however, there is a problem of generating Large spread of vibration

Specifically, in order to search for the resonant frequency f of each acoustic exciter 0Real A complicated auto-tracking circuit must be installed, resulting in an increase in cost

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