Title:
METHOD, APPARATUS AND RECORD CARRIER WITH AVERAGE-RUNLENGTH PRESERVING CODE FOR IMPROVED READOUT PARAMETER CONTROL
Document Type and Number:
WIPO Patent Application WO2005069281
Kind Code:
A3
Abstract:
The present invention relates to a method and apparatus for controlling at least one readout parameter of a magneto-optical domain expansion recording medium. An average detected runlength of the reading signal is monitored, and an error signal is generated on the basis of a comparison of the monitoring result with the predetermined average runlength that has been set during the encoding step. The at least one readout parameter is then controlled by means of the generated error signal. Furthermore, the present invention relates to a method, apparatus and record carrier wherein a runlength constraint is applied to at least one of the following quantities: mark regions and space regions in said storage layer, said runlength constraint being selected to keep an accumulated runlength deviation from a predetermined average runlength within a predetermined range. The proposed runlength property and control scheme provide the advantage that all detected runlengths contribute to the error signal to make the response must faster and to reduce readout errors.
Inventors:
VERSCHUREN COEN A (NL)
COENE WILLEM M J M (NL)
COENE WILLEM M J M (NL)
Application Number:
PCT/IB2005/050036
Publication Date:
October 13, 2005
Filing Date:
January 05, 2005
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
VERSCHUREN COEN A (NL)
COENE WILLEM M J M (NL)
VERSCHUREN COEN A (NL)
COENE WILLEM M J M (NL)
International Classes:
G11B11/105; G11B20/14; H03M5/14; G11B7/125; (IPC1-7): G11B20/14; G11B11/105; H03M5/14
Domestic Patent References:
| WO2003023776A1 | 2003-03-20 |
Foreign References:
| US20040070524A1 | 2004-04-15 | |||
| US5631887A | 1997-05-20 | |||
| EP0477892A2 | 1992-04-01 |
Other References:
HEEGARD C D ET AL: "VARIABLE-LENGTH STATE SPLITTING WITH APPLICATIONS TO AVERAGE RUNLENGTH-CONSTRAINED (ARC) CODES", IEEE TRANSACTIONS ON INFORMATION THEORY, IEEE INC. NEW YORK, US, vol. 37, no. 3, 1 May 1991 (1991-05-01), pages 759 - 777, XP000204272, ISSN: 0018-9448
BRAUN V: "On properties of binary maxentropic DC-free runlength-limited sequences", INFORMATION THEORY, 1995. PROCEEDINGS., 1995 IEEE INTERNATIONAL SYMPOSIUM ON WHISTLER, BC, CANADA 17-22 SEPT. 1995, NEW YORK, NY, USA,IEEE, US, 17 September 1995 (1995-09-17), pages 203, XP010192652, ISBN: 0-7803-2453-6
BRAUN V: "On properties of binary maxentropic DC-free runlength-limited sequences", INFORMATION THEORY, 1995. PROCEEDINGS., 1995 IEEE INTERNATIONAL SYMPOSIUM ON WHISTLER, BC, CANADA 17-22 SEPT. 1995, NEW YORK, NY, USA,IEEE, US, 17 September 1995 (1995-09-17), pages 203, XP010192652, ISBN: 0-7803-2453-6
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