Title:
REDUCING DEVICE FOR INDISTINCT SOUND IN CABIN
Document Type and Number:
Japanese Patent JP3544677
Kind Code:
B2
Abstract:
PURPOSE: To obtain the in-cabin indistinct sound reducing device which has superior follow-up performance and stability.
CONSTITUTION: The signals from an air suction amount sensor 5 and a crank angle sensor 7 are inputted to a signal converting circuit 9 and a memory map setting circuit 10; and the memory map setting circuit 10 selects and sets the filter coefficient W(n) of an adaptive filter 11 by map retrieval based upon engine load information and engine rotation information and the signal converting circuit 9 shapes and processes a primary source and outputs it to an LMS arithmetic circuit 13 through the adaptive filter 11 and a CMN0 circuit 12. The primary source is mixed by the adaptive filter 11 with a canceling signal and outputted as a canceling sound from a speaker 16, and the state at a listening point is detected as an error signal by an error microphone 17 and sent to the LMS arithmetic circuit 13 to update the filter coefficient W(N) of the adaptive filter 11 so that the error signal becomes minimum. This updated filter coefficient W(N) is stored as a new set value of the memory l map setting circuit 10.
Inventors:
Keitaro Yokota
Manpei Tamamura
Hiroshi Iitaka
Kazuyuki Kondo
Manpei Tamamura
Hiroshi Iitaka
Kazuyuki Kondo
Application Number:
JP9648292A
Publication Date:
July 21, 2004
Filing Date:
April 16, 1992
Export Citation:
Assignee:
Fuji Heavy Industries Ltd.
International Classes:
B60R11/02; F01N1/06; G10K11/16; G10K11/178; H03H17/00; H03H17/04; H03H21/00; H04B1/10; H04B3/04; (IPC1-7): G10K11/178; B60R11/02; F01N1/06; H03H17/04; H03H21/00; H04B1/10
Domestic Patent References:
| JP4011293A | ||||
| JP2237298A |
Attorney, Agent or Firm:
Susumu Ito