Optical Disc Wobble Address Extension via Virtual Bits
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Solution Overview
Problem
Existing optical disc technologies face challenges in extending the wobble address configuration without significant restructuring when the physical sector number exceeds conventional bit assignments, limiting the data capacity and layer numbers that can be addressed.
Innovation Solution
The introduction of virtual bits, generated by manipulating the presence or absence of information in the wobble address, allows for the extension of the address bit configuration without altering the wobble structure, enabling increased data capacity and layer numbers by embedding virtual bits in existing address bits and using scramble circuits for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the physical sector number exceeds conventional bit assignments, then the data capacity and layer numbers that can be addressed increase, but the wobble address configuration requires considerable restructuring
Solution Approach 1:
The patent introduces virtual bits that exist in a logical dimension rather than physical encoding dimension. By using virtual bits (VB0, VB1, etc.) that are not physically embedded in the wobble but are generated through logical operations on existing wobble address bits, the system extends addressable capacity without adding physical wobble structure. This dimensional separation allows conventional wobble configuration to remain intact while achieving extended addressing capability for larger data capacities.
Solution Approach 2:
The patent uses virtual bits as an intermediary layer between the physical wobble address and the required extended address space. The virtual bits act as a mediator that translates limited physical wobble addresses into extended logical addresses through generation circuits that perform logical operations. This intermediary approach allows the system to address more sectors and layers without modifying the physical wobble encoding structure.
2Loss of information
If the number of PAA bits to be embedded in the wobble is extended, then the addressable data amount increases, but the wobble address configuration requires considerable restructuring
Solution Approach 1:
The patent creates an additional logical dimension for address bits by introducing virtual bits that are generated through logical operations rather than physical embedding. The generation circuit produces virtual bits (VB0-VBn) by performing logical operations on existing wobble address bits, effectively creating address extension in a logical dimension without requiring physical wobble restructuring.
Solution Approach 2:
The patent generates virtual bits by copying and logically processing existing wobble address bits. The generation circuit retrieves physical ADIP address bits from the wobble signal and creates virtual bit copies through logical operations (such as inversion or combination). These copied and processed virtual bits then serve as extended address information without requiring new physical wobble structures.
Data Source
AI summary
A recording medium, an address generating method, an address detection method and a recording and reproduction apparatus capable of extending the wobble address without any considerable wobble restructuring are disclosed. Virtual bits not recorded in the disc and expressed by the difference of the rule or the presence or absence of the information embedded in a part or the whole of the wobble address are generated. Thus, the extended address can be obtained without changing the number of bits of the address embedded in the wobble.