Title:
ACTIVE MUFFLER FOR VEHICLE ROOM
Document Type and Number:
Japanese Patent JP3097926
Kind Code:
B2
Abstract:
PURPOSE: To prevent malfunction due to an electrical noise from occurring and to simplify electrical filter constitution by comprising a mechanical acoustic filter by utilizing ceiling space between the roof and the roof lining of a vehicle.
CONSTITUTION: A mechanical acoustic filter 14 is comprised by utilizing the ceiling space between a roof 4 and the roof lining 5 of the vehicle in an active muffler in which at least one microphone 15 by which the noise in the room 2 is measured, and one speaker 7 from which a secondary tone to muffle the room 2 is outputted based on the measured result of the microphone 15 are provided. To attain such purpose, the function of low-pass filter for the filled tone of an engine 11 can be provided by setting reduction peak on a frequency area higher than a low frequency area where the filled tone of an engine 11 exists. Thereby, it is possible to prevent the malfunction due to the electrical noise from occurring, and to simplify the structure of an electrical acoustic filter.
Inventors:
Mitsuru Nakamura
Mitsuhide Sasaki
Kenji Sato
Satoshi Hasegawa
Osamu Igarashi
Mitsuhide Sasaki
Kenji Sato
Satoshi Hasegawa
Osamu Igarashi
Application Number:
JP22806591A
Publication Date:
October 10, 2000
Filing Date:
September 09, 1991
Export Citation:
Assignee:
日産自動車株式会社
株式会社日立製作所
株式会社日立製作所
International Classes:
B60R11/02; B60R16/02; G10K11/16; G10K11/178; H04M1/60; (IPC1-7): B60R11/02; G10K11/178
Domestic Patent References:
| JP1231499A |
Attorney, Agent or Firm:
Masami Akimoto