| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein regeneration of high fidelity is hinderd because an elastic coefficient of a speaker's diaphragm varies nonlinearly when the size of input varies and an output is distorted when an input becomes large, and because frequency response characteristics of a speaker generate so-called deviation between input and output from the speaker's mechanical structure in which a phase is delayed in a high frequency component, to a low frequency component, or vibration is delayed transitionally when an input signal is changed suddenly. SOLUTION: An input signal is divided into a low frequency component and a high frequency component by a band dividing part 4, which is stored in buffer memories 6 and 10 temporarily, respectively, and are inputted into foreseeing sliding mode control parts 7 and 11 together with a signal coming out of the band dividing part 4 after a predetermined time. The signal after the predetermined time is handled as a future signal, and a control signal which foresees changes in the future is generated. When a speaker is driven by the control signal, regeneration of high fidelity without distortion is achieved. COPYRIGHT: (C)2009,JPO&INPIT
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