Optical Disc Block Formatting for Stable High-Density Reproduction
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Solution Overview
Problem
High-density optical discs experience increased bit errors during reproduction due to improved storage density, necessitating enhanced error correction capabilities to maintain stable data retrieval.
Innovation Solution
An optical disc apparatus that divides data into blocks, encodes it with a first error-correction code, and includes a quality evaluator circuit to assess recording quality, allowing for stable reproduction by adjusting data amounts and using different error-correction formats based on disc conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If storage density is improved by increasing track density and line density, then recording capacity per volume is improved, but the number of bit errors during reproduction increases
Solution Approach 1:
The patent divides user data into multiple data blocks and records them in separate physical locations on the disc. This segmentation allows independent error correction for each block, preventing error propagation and improving overall reliability while maintaining high recording capacity through efficient space utilization.
Solution Approach 2:
The patent dynamically adjusts error correction parameters and data block sizes based on the physical condition of the disc and reproduction quality feedback. By changing parameters such as block length, error correction code strength, and recording power, the system optimizes both recording capacity and reproduction reliability for high-density discs.
2Reliability
If error correction capability is enhanced to handle high-density reproduction errors, then data reproduction stability is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary error detection and correction by recording test patterns and evaluating reproduction quality before actual data recording. This preliminary action allows the system to pre-adjust error correction parameters and identify problematic disc regions, reducing the need for complex real-time error correction during normal operation.
Solution Approach 2:
The patent implements a feedback mechanism where reproduction quality is continuously evaluated and used to adjust error correction strategies. The system monitors bit error rates and reproduction signal quality, then dynamically modifies error correction code application and data block handling to maintain stability without requiring overly complex fixed error correction systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables stable data reproduction on high-density optical discs by effectively managing error correction and data distribution, ensuring high reproduction performance even in degraded states.
Implementation Method 1
an optical head that records data onto the optical disc
Implementation Method 2
an optical head that records data onto the optical disc and reproduces the data from the optical disc
Data Source
AI summary
In an optical disc apparatus that records and reproduces data onto and from an optical disc in units of predetermined block, an information divider divides the data so as to reduce an amount of the data included in each of blocks when a recording state of the optical disc does not satisfy a predetermined criterion, and reproduces recording data in units of the block by adding sub-information including a value indicating the amount of the data included in each of the blocks. An error-correction encoder circuit encodes the recording data in a first error-correction code format, and a recorder converts encoded recording data into a recording signal, and records the recording signal onto the optical disc. A quality evaluator circuit produces an evaluation value indicating a recording quality based on a result of reproducing the recording signal recorded on the optical disc.