Title:
NOISE CONTROLLER
Document Type and Number:
Japanese Patent JP3522018
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To detect the abnormality of the action of a noise controller.
SOLUTION: An adaptive filter 71 which generates a cancel signal by inputting an engine pulse as a reference signal and an error signal as feedback, is arranged in a noise controller equipped with a speaker for outputting an antiphasic cancel sound against an engine noise and a microphone by which a remaining sound which is an interference result between the noise and the cancel sound is detected as the error signal. An effect reduction judging part 72 judges the effect reduction of the noise control of the adaptive filter 71 so as to alert the deterioration of the speaker and microphone.
Inventors:
Yamato, Toshitaka
Kitao, Hideki
Iwamoto, Shinichi
Kitao, Hideki
Iwamoto, Shinichi
Application Number:
JP26417595A
Publication Date:
April 26, 2004
Filing Date:
October 12, 1995
Export Citation:
Assignee:
FUJITSU TEN LTD
International Classes:
F01N1/00; G08B23/00; G10K11/178; H03H17/02; H03H21/00; (IPC1-7): F01N1/00; G08B23/00; G10K11/178; H03H17/02; H03H21/00
Attorney, Agent or Firm:
石田 敬 （外３名）
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