发明授权
- 专利标题: Method of actively controlling noise, and apparatus thereof
- 专利标题(中): 积极控制噪声的方法及其装置
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申请号: US352230申请日: 1994-12-08
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公开(公告)号: US5689572A公开(公告)日: 1997-11-18
- 发明人: Katsuo Ohki , Shinichi Shimode , Yukiji Iwase , Osamu Sekiguchi , Masanori Watanabe , Takahiro Daikoku , Tamotsu Tsukaguchi , Shigeru Koizumi
- 申请人: Katsuo Ohki , Shinichi Shimode , Yukiji Iwase , Osamu Sekiguchi , Masanori Watanabe , Takahiro Daikoku , Tamotsu Tsukaguchi , Shigeru Koizumi
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-308022 19931208; JPX5-317563 19931217
- 主分类号: G10K11/178
- IPC分类号: G10K11/178 ; H03B29/00
摘要:
In an active noise-reduction controlling apparatus, there are provided a reference sensor for outputting a reference signal corresponding to information about a noise source, a noise-reduction error sensor for detecting a noise-reduction condition, an adding acoustic wave source controlled to produce an acoustic wave having the same amplitude as that of an acoustic wave received at the noise-reduction error sensor and having a phase opposite to that of the acoustic wave received as the noise-reduction error sensor; a first adaptive digital filter for processing the reference signal to output a control signal of the adding acoustic wave source, a second adaptive digital filter for setting a predicted value of a transfer function between an input signal of the adding acoustic wave source and an output signal of said noise-reduction error sensor, a filter coefficient controlling unit for optimizing a coefficient of the first adaptive digital filter with employment of the predicted value of the transfer function and the output of the noise-reduction error sensor, and a control unit for correcting the predicted value of the transfer function in accordance with an environmental change.
公开/授权文献
- US4424470A Motor control circuit for radio controlled models 公开/授权日:1984-01-03