Title:
ADAPTIVE FILTER CONTROL METHOD
Document Type and Number:
Japanese Patent JP2765375
Kind Code:
B2
Abstract:
PURPOSE: To take out satisfactory equivalent output by updating a tap coefficient by a specific signal when the code of an output signal is different from that before or after change.
CONSTITUTION: An error selection signal S is activated before and after the code of the output signal is changed. and the output E1 of an error arithmetic circuit 8 is selected as an error signal E3 sent to a correlator 12. Thereby, the coefficient of a transversal filter 2 is controlled so that the signal amplitude of the output signal before and after the code is changed can approach constant amplitude decided by the output signal D of a decision circuit 7. When the code of the output signal remains unchanged, the signal S is inactivated, and a false error signal E2 is selected as the signal E3 by a switch 11-1. The signal E2 is provided with the same code as that of the output signal, and the coefficient of the filter 2 is controlled in a direction to increase the amplitude of the output signal. In such a way, it is possible to quickly attenuate an unrequired frequency component in the output signal and to obtain the satisfactory equivalent output by switching the error signal.
Inventors:
KAYANUMA KINJI
Application Number:
JP16355692A
Publication Date:
June 11, 1998
Filing Date:
May 28, 1992
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
G11B7/00; G11B7/005; G11B20/10; H03H15/00; H03H17/00; H03H17/02; H03H21/00; H04B3/04; (IPC1-7): G11B20/10; G11B7/00; H03H17/00; H03H17/02; H03H21/00
Domestic Patent References:
| JP149212B2 |
Attorney, Agent or Firm:
Nobuo Takahashi (5 others)