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    • 2. 发明专利
    • Drive control circuit of vibration speaker
    • 振动扬声器的驱动控制电路
    • JP2012060505A
    • 2012-03-22
    • JP2010203111
    • 2010-09-10
    • On Semiconductor Trading Ltdオンセミコンダクター・トレーディング・リミテッド
    • AOKI DAISUKEMURATA TSUTOMU
    • H04R3/04
    • H04R3/00H04R9/025H04R9/10H04R2400/01
    • PROBLEM TO BE SOLVED: To drive a vibration speaker at a frequency as close to its natural frequency as possible, irrespective of state of the vibration speaker.SOLUTION: A driving signal generation unit 10 generates a driving signal having a periodic waveform including zero periods in a vibration mode. A driving unit 20 generates a driving current according to the driving signal generated by the driving signal generation unit 10 to provide the driving current to a voice coil 210. An induction voltage detection unit 30 detects an induction voltage generated in the voice coil 210 during a non-conduction period. A zero-cross detection unit 40 detects a zero-cross of the induction voltage detected by the induction voltage detection unit 30. The driving signal generation unit 10 estimates the natural frequency of a vibration speaker 200 based on the position at which the zero-cross is detected, and brings the frequency of the driving signal close to the natural frequency.
    • 要解决的问题:不管振动扬声器的状态如何,以尽可能接近其固有频率的频率驱动振动扬声器。 解决方案:驱动信号生成单元10在振动模式中产生具有包括零周期的周期性波形的驱动信号。 驱动单元20根据由驱动信号产生单元10产生的驱动信号产生驱动电流,以向音圈210提供驱动电流。感应电压检测单元30检测在音圈210期间产生的感应电压 非传导期。 零交叉检测单元40检测由感应电压检测单元30检测到的感应电压的零交叉。驱动信号生成单元10基于零交叉的位置估计振动扬声器200的固有频率 并使驱动信号的频率接近固有频率。 版权所有(C)2012,JPO&INPIT