Optical Record Carrier Special Code Positional Encoding
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Solution Overview
Problem
The existing recordable Compact Disc (CD-R) technology has limited capacity for storing special information due to the definition of special codes, leading to incompatibility with existing systems when trying to increase storage capacity.
Innovation Solution
The introduction of a record carrier with a predetermined positional relationship between special codes and address codes, allowing for additional control information to be stored without changing the code definitions, enabling increased storage capacity and compatibility with existing systems by using lead-in and lead-out areas for additional information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the definition of special codes is changed to increase information storage capacity, then the amount of information to be stored in special codes is increased, but compatibility with existing systems and standards is lost
Solution Approach 1:
The patent segments the information storage function by distinguishing between special codes (which maintain original definitions for compatibility) and address codes (which carry additional information). This segmentation allows the system to preserve compatibility while expanding information capacity through the positional relationship between codes.
Solution Approach 2:
The patent adds a new dimension to information storage by utilizing the positional relationship between special codes and address codes. Instead of increasing the information capacity of special codes directly, it encodes additional information in the relative positions and sequences of address codes, effectively using spatial arrangement as an additional information carrier.
2Loss of information
If additional control information is stored in the lead-in area, then the storage capacity for control information is increased, but the complexity of detecting and measuring the information is increased
Solution Approach 1:
The patent employs feedback mechanisms where address codes provide reference information that enables the detection system to identify and interpret special codes with their additional positional information. The systematic arrangement of address codes creates a feedback loop that simplifies the detection process by providing contextual reference points.
Solution Approach 2:
The patent uses preliminary action by pre-arranging address codes in specific sequences and positions before the actual data reading process. This preliminary structuring of address codes creates a framework that guides the detection system, making it easier to identify and interpret the additional control information stored in the lead-in area.
3Difficulty of detecting and measuring
If the reading means performs a jump across the record carrier to detect additional information, then the detection capability is improved, but the handling time is increased
Solution Approach 1:
The patent applies dynamics by making the jump behavior conditional rather than fixed. The reading means dynamically adjusts its behavior based on whether additional information is present - it performs jumps only when needed (when special codes with positional relationships are detected) and operates normally for standard discs, thus optimizing handling time while maintaining detection capability.
Data Source
AI summary
The invention relates to a record carrier of a disc-like optically inscribable type, having a preformed track in which an auxiliarily signal comprising a sequence of codes is recorded by means of a preformed track modulation. The codes comprise a sequence of address codes (AC) specifying the addresses of the track portions in which said address codes (AC) are recorded and special codes (SC). The special codes (SC) can be distinguished from said address codes (AC) and specify control data for controlling a recording by a recording device. The sequence can be obtained by replacing in a sequence of address codes (AC) with consecutive address values a plurality of said address by special codes (SC). The periodic pattern of address codes and special codes has a predetermined positional relationship with respect to a predetermined reference address. Such as for example a positional shift with respect to the start of a Lead-in area. The presence and or amount of such a shift may be used to represent additional control information or indicate the presence of area on a disc provided with such additional control information.