| US 7,549,104 B2 | ||
| Digital signal processing method and apparatus performing variable number of error correction repetitions | ||
| Jae-won Kim, Seoul (Korea, Republic of) | ||
| Assigned to Samsung Electronics Co., Ltd., (Korea, Republic of) | ||
| Filed on Oct. 06, 2005, as Appl. No. 11/244,760. | ||
| Claims priority of application No. 10-2004-0081113 (KR), filed on Oct. 11, 2004. | ||
| Prior Publication US 2006/0077822 A1, Apr. 13, 2006 | ||
| Int. Cl. H03M 13/00 (2006.01) | ||
| U.S. Cl. 714—755 | 23 Claims |
| 1. A digital signal processing method for repeatedly correcting read digital data in an optical disc system, the method comprising:
(a) demodulating digital data read from an optical disc to generate EFM demodulation data;
(b) performing a first descrambling of the EFM demodulation data and inspecting an error detection code (EDC) associated with
the data to determine whether errors are present in the data;
(c) when the EDC indicates that at least one error is present in the data, repeatedly performing a PI/PO error correction
operation on the data, and transferring the resulting error-corrected data to a host, wherein (c) further comprises performing
a second descrambling of the error-corrected data and generating an error flag when a code error exists, and performing the
PI/PO error correction operation using the error flag; and
(d) when the EDC indicates that no errors are present in the data, transferring the data to the host without performing PI/PO
error correction operation on the data.
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