Information Record Medium Multi-Stream Packet Multiplexing
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Solution Overview
Problem
Conventional DVD technology is limited in multi-recording multiple main picture streams and efficiently reproducing them without delay, as it is difficult to quickly extract and switch between desired programs due to the technical challenges of identifying and managing multiple streams within a single program stream format.
Innovation Solution
An information record medium and apparatus that multi-records multiple partial streams as a whole stream by a unit of packet, using an object data file, reproduction sequence file, and object information file to store stream identification, address, and association group definition information, enabling efficient selection and switching between programs during reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple main picture streams are multi-recorded in a single program stream format, then recording density and transfer rate are improved, but the difficulty of identifying and extracting desired programs increases
Solution Approach 1:
The patent divides the program stream into multiple independent elementary streams, each carrying a specific main picture stream. This segmentation allows multiple main picture streams to be recorded simultaneously while maintaining clear identification through stream identifiers, resolving the contradiction between recording capacity and program identification difficulty.
Solution Approach 2:
The patent introduces a transport stream as an intermediary layer that multiplexes multiple elementary streams. This intermediary structure enables efficient packing of multiple main picture streams while providing clear separation and identification through standardized stream identifiers, facilitating both high recording density and easy program extraction.
2Quantity of substance
If tracks or pits are miniaturized to increase record density, then more streams can be recorded, but the speed of extracting packets decreases
Solution Approach 1:
The patent replaces the mechanical approach of miniaturizing physical tracks and pits with a digital multiplexing approach using transport stream protocols. This substitution allows multiple streams to be recorded at high density while maintaining fast packet extraction through efficient digital signal processing and stream identification mechanisms.
3Manufacturing precision
If laser beam wavelength is shortened to improve recording precision, then more streams can be recorded, but the complexity of reproduction control increases
Solution Approach 1:
The patent changes the fundamental parameter from physical laser wavelength to digital stream identification parameters. By using transport stream protocols with standardized stream identifiers, the system achieves high recording precision through digital multiplexing rather than relying on shorter laser wavelengths, thereby reducing reproduction control complexity.
Data Source
AI summary
A whole stream consisting of a plurality of partial streams each composed of content information including still image information is multiplexed/recorded in packet basis on an information medium. The information record medium includes a file for storing object data consisting of a plurality of packets each containing a content information piece and a file for storing information defining an object data reproduction sequence. Furthermore, the medium includes an object information file for storing stream identification information for identifying each of the plurality of partial streams among the plurality of packets and address information indicating a recording position of an access unit.