Optical Disc Address Detection with Dynamic Bit Allocation

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Solution Overview

Problem

The existing bit allocation in optical discs, such as Blu-ray Discs, is insufficient for expressing addresses when the data capacity exceeds 32 Gigabytes per layer, leading to limitations in data storage and retrieval.

Innovation Solution

A method and apparatus that selectively control bit allocation and detection of addresses on optical discs by using two address reproducing circuits to adapt to different recording capacities, allowing for bit extension and modified bit allocation, enabling efficient address detection and data positioning on both conventional and high-density optical discs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional bit allocation (27 bits for PSN) is used, then compatibility with existing optical discs is maintained, but the maximum data capacity is limited to 32 Gigabytes per layer

Engineering Contradiction:

Improvedata capacityVSAvoidcompatibility with existing discs

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

The patent implements dynamic bit allocation where the address structure adapts based on disc capacity. For discs exceeding 32GB, the system switches from 27-bit PSN allocation to extended allocation schemes (28-32 bits), allowing the address system to dynamically adjust to different disc capacities while maintaining compatibility with both conventional and high-capacity discs

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the parameter of address bit allocation from fixed (27 bits) to variable (27-32 bits based on disc capacity). This parameter change enables the system to accommodate larger data capacities while preserving backward compatibility through selective application of different bit allocation schemes

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If bit extension is implemented to support larger capacities, then data capacity exceeds 32 Gigabytes, but the address detection method becomes more complex

Engineering Contradiction:

Improvedata capacityVSAvoidaddress detection method

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the address detection process into distinct paths: one for conventional 27-bit allocation and another for extended 28-32 bit allocation. This segmentation allows the complex extended detection method to be isolated and only activated when needed, rather than being universally applied to all discs

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention introduces an intermediary detection mechanism that first identifies whether a disc requires extended bit allocation before applying the more complex detection method. This intermediary step simplifies the overall system by avoiding unnecessary complexity for conventional discs while enabling extended capacity support when required

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8289820B2Address generating and detecting method and reproducing and recording apparatus

Publication Date: 2012.10.16 KONINKLIJKE PHILIPS NV

AI summary

Recording capacity per layer is detected from a disc and bit allocation of wobble addresses in a conventional optical disc and bit allocation in a high-density optical disc are controlled selectively to detect physical position addresses on the disc. Address detection can be performed for two kinds of discs which are equal in structure of addresses embedded in wobbles but different in bit allocation of addresses.