Mobile TV Stream Association for Error-Corrected Wireless Reception
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Solution Overview
Problem
Current ATSC digital TV broadcast systems face challenges in providing reliable mobile reception of digital television signals, especially at vehicular speeds, due to difficulties in maintaining signal integrity under adverse conditions such as background noise and deep channel fading.
Innovation Solution
The system employs a method of wirelessly transmitting audiovisual information to mobile devices using packetized data according to the ATSC standard, incorporating multiple error correction coding methods and control information to associate error correction coding with audiovisual streams, allowing for robust processing and presentation even under adverse conditions. This includes generating multiple packets with different error correction coding patterns, which can be transmitted separately or together, and using control information to associate these with the audiovisual information for effective error protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple error correction coding methods are used to improve signal reliability, then reception reliability improves, but system complexity increases
Solution Approach 1:
The patent segments the error correction process by dividing the transport stream into multiple packets, each protected by different error correction coding schemes (first, second, and third error correction coding). This segmentation allows the system to apply specialized error correction methods to different portions of the data, improving overall reliability while managing complexity through structured organization of correction mechanisms.
Solution Approach 2:
The patent employs composite error correction by combining multiple error correction coding methods (systematic and non-systematic coding) into a unified protection scheme. Different packets within the same transport stream receive different types of error correction coding, creating a composite protection structure that leverages the strengths of various coding methods to enhance signal reliability under diverse channel conditions.
2Reliability
If error correction coding information is transmitted separately from audiovisual information, then error protection effectiveness improves, but synchronization difficulty increases
Solution Approach 1:
The patent introduces control information as an intermediary that bridges the separately transmitted error correction coding information and audiovisual information. This control information contains association data that enables the receiver to correctly match error correction codes with their corresponding audiovisual packets, solving the synchronization problem while maintaining the benefits of separate transmission for enhanced error protection.
Solution Approach 2:
The system performs preliminary organization of error correction coding information into distinct packets before transmission. By pre-structuring the error correction data and preparing control information that describes the associations, the system enables efficient synchronization at the receiver without requiring complex real-time alignment processes, thus reducing synchronization difficulty while maintaining effective error protection.
3Reliability
If redundant error correction packets are transmitted, then reception robustness improves, but bandwidth consumption increases
Solution Approach 1:
The patent applies local quality by providing different levels and types of error correction protection to different packets within the transport stream. Rather than uniformly applying heavy error correction to all data, the system selectively applies systematic and non-systematic error correction coding to specific packets based on their importance and error susceptibility, optimizing bandwidth usage while maintaining robustness where most needed.
Data Source
AI summary
A system and method for wirelessly transmitting audiovisual information. A first plurality of packets including audiovisual information may be generated. A second plurality of packets including error correction coding information for the audiovisual information may be generated. Control information for associating the error correction coding information with the audiovisual information may be generated, and a third plurality of packets including the control information may also be generated. The plurality of packets, including the first, second, and third pluralities of packets, may be transmitted to a mobile device in a wireless manner. The control information may inform the mobile device of the association of the first error correction coding information with the audiovisual information.