DVB-SI Descriptor for Non-Real-Time Content Identification
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Solution Overview
Problem
Digital television broadcasting networks face challenges in distinguishing and managing real-time and non-real-time audiovisual content, as documents intended for later reproduction cannot be presented in program selection menus due to the inability to be played back in real time.
Innovation Solution
A method and device that utilize the DVB-SI standard to differentiate between real-time and non-real-time content by inserting descriptors into the PAT table, allowing for the identification of secondary streams with time indications and priority settings, enabling easy recording and management of non-real-time content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If documents are transmitted without time constraints for later reproduction, then storage and on-demand playback capability are improved, but the ability to present them in real-time program selection menus deteriorates
Solution Approach 1:
The patent segments the stream into two distinct types: main streams for real-time services and secondary streams for non-real-time documents. This segmentation allows the receiver to differentiate between content types and manage them appropriately, with secondary streams being identifiable through specific descriptors in the PMT table but excluded from real-time program menus, thus resolving the contradiction between storage capability and menu presentation.
2Loss of information
If descriptors are inserted into the PMT table to identify secondary streams, then identification and management of non-real-time content is improved, but the complexity of stream processing increases
Solution Approach 1:
The patent introduces an intermediary descriptor structure within the PMT table that specifically identifies secondary streams without requiring fundamental changes to the existing DVB stream processing architecture. This intermediary mechanism allows receivers to identify and manage non-real-time content through additional metadata fields while maintaining compatibility with standard stream processing pipelines, thus reducing the impact on system complexity.
3Quantity of substance
If both real-time and non-real-time documents are transmitted in the same stream, then bandwidth utilization is improved, but the difficulty of distinguishing and managing different content types increases
Solution Approach 1:
The patent applies local quality differentiation by assigning distinct characteristics to different stream types within the same multiplexed transmission. Secondary streams are marked with specific descriptors in the PMT table that indicate their non-real-time nature, allowing receivers to locally identify and handle them differently from main streams. This localized differentiation maintains efficient bandwidth utilization while enabling easy distinction and management of content types through targeted metadata.
Data Source
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AI summary
The present invention relates to a device for receiving a multiplexed stream specified by the DVB-SI standard comprising at least one main stream comprising a first PAT table identifying at least one first PMT table containing at least the list of elementary streams of an audiovisual service currently being broadcast and intended to be reproduced in real time. The device determines in the content of the first PMT table a descriptor listing identifiers of elementary streams constituting a secondary stream. The secondary stream transmits at least one audiovisual document in PUSH mode without any time constraint. The device receives the audiovisual document by using the data included in the descriptor and records it so as to reproduce it later. The present invention also relates to the method of generating the multiplexed stream and the devices able to implement the method.