公开(公告)号：US20080192948A1

公开(公告)日：2008-08-14

申请号：US11572269

申请日：2005-07-15

申请人： Yoichi Kan ,  Yoshio Nakamura ,  Masahide Onishi ,  Toshio Inoue ,  Akira Takahashi ,  Yasunori Kobayashi

发明人： Yoichi Kan ,  Yoshio Nakamura ,  Masahide Onishi ,  Toshio Inoue ,  Akira Takahashi ,  Yasunori Kobayashi

IPC分类号： G10K11/16

CPC分类号： F02B77/13 ,  B60R13/0838 ,  G10K11/178 ,  G10K2210/1282 ,  G10K2210/3039

摘要： An active noise control system cancels vibration and noise based on an output from an adaptive notch filter. When the difference between a current engine pulse value input to the adaptive notch filter and a past engine pulse value within a predetermined time period exceeds a predetermined level, an engine pulse monitor turns off a switch to stop the output from the adaptive notch filter. As a result, when there is a sudden change in the engine rpm, the output from the adaptive notch filter is stopped before the renewal speed of the adaptive notch filter coefficient becomes too fast to follow and the coefficient diverges, to prevent generation of abnormal sound. With this active noise control system, the user will not hear any abnormal sound from the adaptive notch filter even when there is a sudden change in the engine pulse.

摘要翻译： 主动噪声控制系统基于自适应陷波滤波器的输出消除振动和噪声。 当输入到自适应陷波滤波器的当前发动机脉冲值与预定时间段内的过去发动机脉冲值之间的差异超过预定值时，发动机脉冲监视器关闭开关以停止自适应陷波滤波器的输出。 结果，当发动机转速突然变化时，自适应陷波滤波器的输出在自适应陷波滤波器系数的更新速度变得太快而不能跟随并且系数发散之前就停止了自适应陷波滤波器的输出，以防止产生异常声音 。 使用这种主动噪声控制系统，即使发动机脉冲突然变化，用户也不会听到来自自适应陷波滤波器的任何异常声音。