Optical Disc Data Sampling Using Dual Sync Tag Signals
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Solution Overview
Problem
Current optical disc data sampling methods face challenges in accurately reading data from defective areas caused by scratches or other issues, as they rely on sync tag signals for timing correction, which can lead to timing errors and inaccurate data division.
Innovation Solution
A method and apparatus that utilize a first and second sync tag signal to determine the correct timing for data sampling, allowing for backward or forward division of data signals based on the truth values of these signals, ensuring accurate data reading even in defective areas by using the timing of either signal as a base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sync tag signal is used for timing correction, then the data sampling timing can be corrected, but timing errors accumulate in defective areas causing inaccurate data division
Solution Approach 1:
The patent performs preliminary detection of both first and second sync tag signals before determining the data sampling timing. By preparing multiple timing reference signals in advance and selecting the appropriate one based on detection results, the system avoids timing errors that would accumulate in defective areas, thereby improving both measurement precision and reliability.
Solution Approach 2:
The patent introduces a backup mechanism by detecting both first and second sync tag signals beforehand. When one signal is found to be erroneous (in defective areas), the other signal serves as a cushioning backup to prevent timing errors, ensuring continuous accurate data sampling without accumulation of errors.
2Device complexity
If data sampling relies on a single timing base, then the sampling process is simple, but timing errors cause inaccurate data division in defective areas
Solution Approach 1:
The patent dynamically selects between first and second sync tag signals as the timing base depending on the detection results. The system adapts its timing reference based on the actual signal quality, switching between different timing bases to maintain accurate data division while keeping the overall process manageable through conditional logic.
3Ease of operation
If the timing of data sampling is not accurately corrected, then the sampling process is simple, but the data signal is misread
Solution Approach 1:
The patent implements a feedback mechanism where the detection results of first and second sync tag signals are used to determine the appropriate timing base for data sampling. This feedback loop ensures that timing is accurately corrected based on actual signal conditions, maintaining high reading accuracy while keeping the operation relatively simple through automated selection.
Data Source
AI summary
Technology for sampling optical disc data are described. A first sync tag signal and a data signal are provided, and the previous first sync tag signal is saved as a second sync tag signal. Then, the value of the first sync tag signal and the second sync tag signal are determined to be true or false so as to divide the data signal. Since the neighboring sync tag signals are detected simultaneously, and the timing for sampling the data in the frame is determined according to whether the two contiguous sync tag signals are true or false, the technology can reproduce optical disk data accurately.