Patent ID: 6950379
Filing Date: 2005-09-27
Classification: G11B

Abstract:
1. A method for extracting information in a data signal stored on an optical disc, the information being stored in a plurality of channel bits, the method comprising steps: (a) initializing a recovery period of a recovery clock to a first predetermined value expressed in cycles of a first clock; (b) sampling the data signal with the first clock; (c) obtaining a leading edge time period expressed in cycles of the first clock of a pattern of bits from the sampled data in which at least a first bit has a first binary value, followed by a plurality of bits having a second binary value, and ending with a last bit having the first binary value, wherein the first and second binary values are not equal; (d) updating the recovery period of the recovery clock to be equal to a new maximum period that is the leading edge time period divided by a division factor; (e) extracting the information in the data signal based on the newest recovery period of the recovery clock while steps (b) through (d) are operating; (f) repeating steps (b) through (e) until a predetermined code is detected in the data signal; and (g) extracting the information in the data signal based on the finalized recovery period of the recovery clock determined by steps (a) through (f).