Title:
ADAPTIVE ACTIVE NOISE CONTROLLER
Document Type and Number:
Japanese Patent JP3499885
Kind Code:
B2
Abstract:
PURPOSE: To effectively make a VS algorism adapive without diverting it even when the frequency of bad coherence is constantly generated by a turbulent flow caused by a flow variation or a wind between a microphone for detecting a noise and a microphone for detecting a residual noise.
CONSTITUTION: This controller is constituted of a microphone 1 for detecting a noise, a microphone 5 for detecting a residual noise, a control section 2 for making an additional sound for reducing the noise based on a noise signal by the noise detection microphone 1 and a control signal by the residual noise detection microphone 5 and a speaker 4 for generating an additional sound based on an additional sound signal from the control section 2 and provided with a first band pass filter 12 in the shape of a coherence between the noise detection microphone 1 and the residual noise detection microphone 5, a second band pass filter 9 for limitting a band and a control section 11 for comparing the control signal of the residual noise detection microphone 5 passing through the first and second band pass filters 12 and 9.
Inventors:
Masahiro Yoshida
Application Number:
JP24194992A
Publication Date:
February 23, 2004
Filing Date:
September 10, 1992
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
F01N1/06; F24F13/02; G10K11/16; G10K11/178; (IPC1-7): G10K11/178; F01N1/06; F24F13/02
Domestic Patent References:
| JP56185A |
Attorney, Agent or Firm:
Masamasa Shibano