Title:
ACTIVE NOISE CONTROLLER
Document Type and Number:
Japanese Patent JP3293922
Kind Code:
B2
Abstract:
PURPOSE: To identify the function of transmission between a control sound source and a residual noise detecting means with high accuracy by increasing an arithmetic variable a little.
CONSTITUTION: A pulse signal x' synchronized with a reference signal (x) can be supplied through an intermittent switch part 17 to an adder part 16 together with a driving signal ym of a loud speaker. When the intermittent switch part 17 is turned to a connected state and the pulse signal x' is added to the driving signal ym, the filter coefficient of one filter CΛ11m for identification is updated so that a residual noise signal el can be coincident with the output of the filter CΛ11m for identification, and when the intermittent switch part 17 is turned to a disconnected state and the pulse signal x' is not added to the driving signal ym, the filter coefficient of another filter CΛ01m for identification is updated so that the residual noise signal el can be coincident with the output of the filter CΛ1m for identification. Then, a transmission function filter CΛ1m is set according to filter coefficient difference between those filters CΛ11m and CΛ01m for identification.
Inventors:
Haruo Hamada
Yoshiharu Nakaji
Yoshiharu Nakaji
Application Number:
JP1413293A
Publication Date:
June 17, 2002
Filing Date:
January 29, 1993
Export Citation:
Assignee:
Haruo Hamada
Nissan Motor Co., Ltd
Nissan Motor Co., Ltd
International Classes:
B60R11/02; F01N1/06; G10K11/16; G10K11/178; H03H17/00; H03H17/02; H03H17/04; H03H21/00; H04B3/04; (IPC1-7): G10K11/178; B60R11/02; F01N1/06; H03H17/02; H03H21/00
Domestic Patent References:
| JP62193310A | ||||
| JP4267298A |
Attorney, Agent or Firm:
Tetsuya Mori (2 others)