Title:
SOUND ELIMINATION DEVICE FOR DUCT
Document Type and Number:
Japanese Patent JPH0546181
Kind Code:
A
Abstract:
PURPOSE: To minimize the constitution of the device, which eliminates the noise in the duct by generating a sound from a speaker, without the need to machine a duct main body by fixing the speaker to the duct where the noise is sent.
CONSTITUTION: An additional duct 2A is fixed to the tip opening part of the duct 2 and the speaker 7 is arranged thereupon. A microphone 3 is provided in the duct 2 and a correction signal having the opposite characteristics from a noise signal as the output of the speaker is inputted to the speaker 7 and converted into a sound, which is sent in the duct 2.
Inventors:
NAGAI KOJI
Application Number:
JP23245591A
Publication Date:
February 26, 1993
Filing Date:
August 21, 1991
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G10K11/178; G10K11/16; (IPC1-7): G10K11/16
Attorney, Agent or Firm:
Shinichi Kusano
Next Patent: ON-VEHICLE AUDIO NOISE CANCELER DEVICE