Title:
FILTER COEFFICIENT ADJUSTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2005/045829
Kind Code:
A1
Abstract:
A filter coefficient adjusting circuit includes a coefficient adjusting circuit (2) that performs equivalent coefficient adjustments by weighting, by factors of n and (2 - n), the initial values of the equivalent coefficients located on the left and right sides, respectively, of the center tap of an FIR filter (1) that equalizes a reproduced signal. The filter coefficient adjusting circuit decides the weighting value of n such that equalizing performance determining means for determining the equalizing performance of the reproduced signal, for example, a jitter detector (5) that detects jitters of the reproduced signal and clocks provides an optimum output. According to this filter coefficient adjusting circuit, the control procedure can be simplified as compared with the conventional group delay correcting circuits without any necessity of additional circuits. Moreover, the group delay of the reproduced signal can be optimized in accordance with the characteristic of the reproduced signal, thereby improving the reproduction performance.
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Inventors:
OKAMOTO KOUJI
NAKAHIRA HIROYUKI
NAKAHIRA HIROYUKI
Application Number:
PCT/JP2004/016575
Publication Date:
May 19, 2005
Filing Date:
November 09, 2004
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
OKAMOTO KOUJI
NAKAHIRA HIROYUKI
OKAMOTO KOUJI
NAKAHIRA HIROYUKI
International Classes:
G11B20/10; G11B20/14; H03H17/02; H03H17/06; H03H21/00; H04L25/03; (IPC1-7): G11B20/10; G11B20/14; H03H17/02; H03H17/06; H03H21/00
Foreign References:
| JP2002269925A | 2002-09-20 | |||
| JPH10214458A | 1998-08-11 | |||
| JPH02260876A | 1990-10-23 |
Attorney, Agent or Firm:
Hayase, Kenichi (4F The Sumitomo Building No. 2, 4-7-28,
Kitahama, Chuo-k, Osaka-shi Osaka, JP)
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