Title:
ACTIVE SOUND ATTENUATOR
Document Type and Number:
Japanese Patent JPS59133595
Kind Code:
A
Abstract:
A speaker 17 is connected by a waveguide 19 to an acoustic mixer 15 leading from a duct 13 carrying source sounds to be cancelled by an active acoustic attenuator 11. The coupling component which couples the physical system with the electronic system 11, consists of a microphone array 33 disposed in the duct 13, and a microphone 35 disposed in acoustic mixer 15 downstream from the waveguide 19. Broad band noise is sensed by microphone array 33 which produces a signal which causes an adaptive filter 23 to drive the speaker 17 so as to introduce "cancelling" noise. The microphone 35 senses the degree of cancellation of the source sound by the speaker 17. The signal from microphone 35 produces an error signal, which is also sent to the adaptive filter to adjust its output so as to produce a more effective "cancelling" sound from the speaker 17.
Inventors:
GUREN EDOUIN WAANAKA
RIN AREN PUURU
JIRI CHICHI
RIN AREN PUURU
JIRI CHICHI
Application Number:
JP20606783A
Publication Date:
July 31, 1984
Filing Date:
November 04, 1983
Export Citation:
Assignee:
LORD CORP
International Classes:
G10K11/16; G10K11/178; (IPC1-7): G10K11/16
Attorney, Agent or Firm:
Warren G. Simor