ATSC Transport Stream Emergency Alert Segmentation
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Solution Overview
Problem
There is no standard method for delivering emergency alert information in machine-readable form in terrestrial broadcast digital television, which can lead to missed notifications when viewers are watching recorded content or delayed broadcasts.
Innovation Solution
The system integrates emergency alert information into the ATSC digital television transport system, using existing standards to identify and acquire machine-readable Transport Stream packets, allowing for geographic targeting and local storage of alerts for playback, and includes a receiver with a software module to parse and respond to emergency alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency alert information is embedded in program audio/video or modulated audio signal, then the alert information can be delivered through terrestrial broadcast, but the information is not in machine-readable form and cannot be reliably detected when viewers are watching recorded content or delayed broadcasts
Solution Approach 1:
The patent segments the broadcast signal into separate components: program audio/video content and emergency alert data. The alert information is extracted and placed in a dedicated data stream within the transport stream, separate from the program content. This segmentation allows receivers to independently process and detect alert information in machine-readable form regardless of whether they are watching live or recorded content.
Solution Approach 2:
The patent introduces an intermediary data structure (transport stream packets with specific packet identifiers) that carries emergency alert information between the broadcast system and receiving devices. This intermediary format enables reliable machine-readable transmission while maintaining compatibility with existing broadcast infrastructure.
2Ease of operation
If viewers watch recorded content or delayed broadcasts, then they can view content at their convenience, but they will not receive timely emergency alert notifications
Solution Approach 1:
The patent implements preliminary action by embedding emergency alert information in the transport stream alongside program content. Receivers continuously monitor the transport stream for alert packets in advance, so when an alert is broadcast, it is immediately detected and presented to the viewer regardless of whether they are watching live or recorded content. This eliminates notification delays while preserving viewing convenience.
3Reliability
If a standard method for emergency alert delivery is established in terrestrial broadcast, then machine-readable alert information can be reliably transmitted, but the system complexity increases
Solution Approach 1:
The patent applies universality by utilizing existing ATSC transport stream infrastructure and packet structures to carry emergency alert information. The same transport mechanism used for program content is also used for alert data, eliminating the need for separate dedicated transmission systems. This multi-functional use of existing infrastructure achieves reliable alert delivery without significantly increasing system complexity.
Data Source
AI summary
Systems and methods are disclosed for broadcasting and receiving a terrestrial broadcast signal containing emergency alert information in machine-readable format. The method includes the steps of scanning a Transport Stream associated with the terrestrial broadcast signal. The Transport Stream contains one or more Transport Stream packets and a plurality of tables, which are parsed to identify a channel having a type specified as containing emergency alert information. An MPEG-2 program having said emergency alert information may then be acquired for delivery through a terrestrial broadcast receiver.