DVD Recording Navigation Information Handling

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Solution Overview

Problem

Existing DVD recording technologies face delays in real-time recording due to the need for management information preparation, leading to data loss during power interruptions and inefficient use of recording space, especially when using hard disk drives or backup power supplies.

Innovation Solution

A method and apparatus that generate video object units without ending time and search information, allowing for immediate recording on a DVD, followed by the generation and recording of navigation information, which includes ending time and search information, enabling real-time recording and data recovery without buffering or the need for additional storage like hard disk drives.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If management information is prepared and recorded before contents data, then data integrity is ensured, but recording delay increases

Engineering Contradiction:

Improvedata integrityVSAvoidrecording delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by recording navigation portions (placeholders for management information) in advance within video object units before the actual contents data recording is complete. This allows the recording process to continue without waiting for management information preparation, while ensuring data integrity through subsequent completion of navigation information recording.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the recording process into two phases: first recording video object units with navigation portions (placeholders), then separately completing the navigation information recording. This segmentation allows continuous recording without delays while maintaining data integrity through the two-phase approach.

Inventive Principle:

Principle #1Segmentation

2Stability of the object's composition

If management information recording is awaited before contents data recording, then data structure integrity is maintained, but real-time recording performance deteriorates

Engineering Contradiction:

Improvedata structure integrityVSAvoidreal-time recording performance

Core Design Contradiction:

Stability of the object's compositionVSProductivity

Solution Approach 1:

The patent creates navigation portions as placeholders in advance within video object units, allowing immediate recording of contents data without waiting for complete management information preparation. This preliminary action maintains the ability to ensure data structure integrity while enabling real-time recording performance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The navigation portion acts as an intermediary placeholder that allows the recording process to proceed without complete management information. It serves as a temporary structure that maintains data organization integrity while enabling continuous real-time recording, to be completed later.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If buffering is used to prepare management information, then recording accuracy is improved, but recording speed decreases

Engineering Contradiction:

Improverecording accuracyVSAvoidrecording speed

Core Design Contradiction:

Manufacturing precisionVSSpeed

Solution Approach 1:

The patent records navigation portions as placeholders in advance without buffering the complete management information. This preliminary action allows immediate recording with sufficient accuracy for the recording phase, while speed is maintained by avoiding the buffering delay. The complete management information is finalized later without affecting the recorded contents.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If hard disk drive or backup power supply is used to prevent data loss, then reliability during power interruption is improved, but device complexity and cost increase

Engineering Contradiction:

Improvedata protection during power interruptionVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent records navigation portions as placeholders in advance within video object units before power interruption can occur. This preliminary action ensures that even if power is interrupted during management information completion, the recorded contents data with its navigation structure remains intact and recoverable, eliminating the need for hard disk drives or backup power supplies.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7680397B2Method and apparatus for recording data on a recording disc, and method and apparatus for restoring data recorded on a recording disc

Publication Date: 2010.03.16 JVC KENWOOD CORP

AI summary

Video object units are generated from a program stream. The generated video object units have navigation portions respectively, and compose video objects. The navigation portions are void of ending time information and search information. The video object units are sequentially recorded on the recording disc without being buffered. Ending time information and search information are detected from the program stream. A decision is made as to whether or not the recording of video object units composing one video object has been completed. Navigation information is generated which includes the ending time information and the search information, and which corresponds to the last recorded video object. The generated navigation information is recorded on zones in the recording disc which correspond to the navigation portions of the video object units composing the last recorded video object each time the recording of video object units composing one video object has been completed.