Title:
CALCULATING DEVICE OF COEFFICIENT OF ACOUSTIC FIELD CONTROL FILTER AND ACOUSTIC FIELD CONTROLLER
Document Type and Number:
Japanese Patent JP3428861
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To calculate the coefficient of an acoustic field control filter for controlling an acoustic field characteristic at a control point in a listening room or car to a target characteristic at high speed.
SOLUTION: Convolution arithmetic operation for one period of an input signal X for calculating the coefficient is executed in advance to the unchanged part (a target pules response D and an impulse response C from a speaker to a control point) in the course of calculation of the coefficient of an acoustic field control filter and the arithmetic result (CX, DX) is stored in data storages 101, 102. Arithmetic operation for successively updating the coefficient W of an adaptive FIR filter 103 in a coefficient updating device 104 is repeated until the output of the adaptive FIR filter converges to target data by repeatedly using the data. The converged value W becomes the coefficient of the acoustic field control filter. Since CX, DX are calculated in advance, a number of times of convolution arithmetic at the time of updating the coefficient is reduced and the coefficient of the acoustic field control filter is calculated at high speed.
Inventors:
Kazuhiro Nakamura
Application Number:
JP16351997A
Publication Date:
July 22, 2003
Filing Date:
June 06, 1997
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G10K15/12; G06F17/10; G10K15/00; H03H17/02; H03H21/00; (IPC1-7): G10K15/00; G10K15/12
Domestic Patent References:
| JP7306684A | ||||
| JP795684A | ||||
| JP473000A | ||||
| JP774565A | ||||
| JP7162985A | ||||
| JP833092A | ||||
| JP9185383A | ||||
| JP863175B2 |
Attorney, Agent or Firm:
Role Masaaki (3 others)