Alert Service Insertion in Single-Frequency Network Broadcasting
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Solution Overview
Problem
Broadcasting alert services in single-frequency networks for digital audiovisual programs is complex due to synchronization requirements among transmitters, making it difficult to implement quickly and efficiently, especially in emergency situations like natural disasters.
Innovation Solution
A method and device for inserting an alert service into the broadcasting system that involves obtaining frames, identifying packet identifiers, storing and replacing audio and video packets, and encapsulating them in a T2-MI stream, allowing for rapid broadcast of alert messages with minimal complexity, enabling synchronization and alignment of frames to ensure seamless integration with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alert service is broadcast in SFN system using standard synchronization methods (T2-MI packets), then transmitter synchronization is achieved, but implementation complexity and time delay increase
Solution Approach 1:
The alert service packets are pre-formatted and prepared in advance with proper synchronization markers and T2-MI packet structures. When an emergency alert needs to be broadcast, the pre-prepared packets are simply inserted into the existing multiplexed stream without requiring complex real-time processing or re-synchronization of the SFN transmitters, thus reducing implementation complexity while maintaining synchronization reliability
2Productivity
If alert service packets are inserted into multiplexed stream with proper synchronization markers, then rapid broadcast is achieved, but packet identification and management complexity increases
Solution Approach 1:
A dedicated insertion module acts as an intermediary between the alert service source and the multiplexed broadcast stream. This module automatically handles packet identification, synchronization marker insertion, and stream integration, eliminating the need for complex manual packet management while enabling rapid alert broadcast. The module translates alert packets into the appropriate T2-MI format and inserts them at optimal points in the multiplexed stream
3Stability of the object's composition
If standard SFN synchronization packets are used for alert service, then network synchronization is maintained, but alert broadcast time delay increases
Solution Approach 1:
The alert service packets are merged with the existing T2-MI synchronization packet structure and multiplexed alongside regular service packets in the same stream. This integration allows alert packets to inherit the synchronization properties of the main broadcast stream while being transmitted with the same timing and synchronization markers as regular packets, eliminating additional delay while maintaining network synchronization stability
Data Source
AI summary
A method for broadcasting an alert service in a system for broadcasting digital audiovisual programs in a single-frequency network, wherein the method includes steps of: obtaining frames containing the alert service and other services; associating a mark for each frame; identifying the identifiers of the packets of audio and video components of the alert service and of other services; identifying the identifiers of packets of audio and video components of other services; receiving a command to broadcast an alert message; storing video and audio packets of the alert service as from the first frame mark following the reception of the alert message broadcast command; and replacing, from the second frame mark following the reception of the alert message broadcast command, all the packets of the video and audio components of the services other than the alert service with the packets of the alert service.