AV Recording Management for High-Speed Thumbnail Navigation
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Solution Overview
Problem
Conventional recording and playback apparatuses lack user-friendly features such as arbitrary playlist order rearrangement, multi-user playlist management, efficient resume playback control, and high-speed navigation display, especially when using optical discs with low read-write speeds and large capacity storage like iVDR systems.
Innovation Solution
The introduction of a management unit and upper management layer that handles all playlist information as integrated information, enabling user-defined playback range registration, independent resume point management, and pre-generated thumbnails for high-speed navigation display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If optical disc is used as recording medium, then large capacity storage is achieved, but read-write speed becomes slow
Solution Approach 1:
The patent segments the recording medium into multiple zones with different access characteristics. High-speed access zones are positioned for frequent operations while lower-speed zones handle bulk storage, allowing the system to achieve both large capacity and fast access speeds for critical data.
Solution Approach 2:
The patent introduces a buffer memory as an intermediary between the optical disc and the processing unit. This buffer temporarily stores data during read-write operations, masking the slow speed of the optical disc and providing fast access for active data, thus resolving the speed-capacity contradiction.
2Device complexity
If multiple playlists are managed at the same management level, then system simplicity is maintained, but arbitrary order rearrangement becomes impossible
Solution Approach 1:
The patent introduces a hierarchical management structure with multiple levels. Playlists are organized across different management levels, allowing arbitrary rearrangement within each level while maintaining overall system organization. This dimensional expansion enables flexible reordering without increasing perceived complexity for the user.
3Quantity of substance
If thumbnail generation is performed in real-time during playback, then memory usage is reduced, but navigation display speed becomes slow
Solution Approach 1:
The patent generates and stores thumbnails in advance during the recording process, rather than generating them in real-time during playback. These pre-generated thumbnails are stored in the management information, enabling rapid navigation display without consuming additional memory during playback operations.
Data Source
AI summary
As a method of quickly displaying a thumbnail for navigation display of an AV stream, it is necessary to associate the AV stream with a thumbnail file when recording the thumbnail file separately from the AV stream file. The association, therefore, is performed by use of a serial number of the recorded AV stream file as a name of the related thumbnail file.