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 exciter drive circuit suitable for use in portable information terminals where there is a variation in the resonant frequency of the composite acoustic exciter. Background technique [0002] Composite acoustic exciters use the working principle of dynamic speakers to generate vibration and sound, and are used in portable information terminals such as cellular phones to generate sound or vibration when a call is received. The composite acoustic exciter has a resonant frequency corresponding to sound and a resonant frequency corresponding to vibration. Generally, when a signal whose frequency is equal to the low resonant frequency is input, the composite acoustic exciter works as a vibrating body, and when a signal whose frequency is equal to a high frequency is input, the composite acoustic exciter works as an acoustic generator. In this case, both vibration and sound are used to notify the user tha...

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 OReal A complicated auto-tracking circuit must be installed, resulting in an increase in cost

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