Optical Disc Data Structure for Multiple Audio Stream Management
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Solution Overview
Problem
Current methods for managing multiple audio streams on high-density optical discs, such as Blu-ray discs, lack an appropriate data structure for efficient reproduction and recording, unlike the established standards for DVD-ROMs.
Innovation Solution
A data structure on the recording medium that includes a multiplexed transport stream with packet identifiers for each audio stream, a clip information file for managing reproduction, and a program information field that provides coding information for each audio stream, allowing for efficient recording and playback of multiple audio streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple audio streams are recorded on high-density optical discs without an appropriate data structure, then the recording capacity is increased, but the reproduction management becomes inefficient and complex
Solution Approach 1:
The patent segments the audio data management by dividing multiple audio streams into distinct packets, each with unique packet identifiers. The transport stream is organized into packets where each packet contains audio data from a specific stream, allowing the reproduction apparatus to selectively reproduce only the desired audio stream by identifying packets through their packet identifiers, thus simplifying the management of multiple audio streams.
Solution Approach 2:
The patent introduces packet identifiers as an intermediary mechanism between the multiple audio streams and the reproduction apparatus. These packet identifiers act as mediators that enable the reproduction apparatus to efficiently identify and select specific audio streams without having to process or analyze the entire multiplexed audio data, thereby reducing reproduction management complexity.
2Ease of operation
If multiple audio streams are multiplexed without packet identifiers, then the data structure is simpler, but the ability to selectively reproduce specific audio streams is lost
Solution Approach 1:
The patent applies local quality by adding packet identifiers specifically to the packets containing audio stream data, rather than requiring a complete restructuring of the entire data structure. Each packet is locally enhanced with its identifier, enabling selective reproduction of audio streams while keeping the overall data structure relatively simple and maintaining ease of operation.
3Measurement precision
If audio streams are recorded with detailed coding information for each stream, then the reproduction accuracy is improved, but the navigation information size increases
Solution Approach 1:
The patent extracts only the essential coding information needed for reproduction and places it in the packet headers alongside the packet identifiers. By taking out only the necessary coding information rather than including all possible audio stream attributes, the system maintains reproduction accuracy while minimizing the increase in navigation information size.
Data Source
AI summary
The recording medium includes a data area storing at least multiple audio streams in at least one portion thereof. The multiple audio streams are multiplexed, and each audio stream is a transport stream stored as one or more packets. Each packet has a packet identifier, and the packets of the same audio stream have the same packet identifier.