Cross-Stream Error Correction for Mobile Multimedia Broadcasts
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Solution Overview
Problem
Current ATSC digital television broadcast systems face challenges in providing reliable mobile reception of digital television signals, especially at vehicular speeds due to difficulties in maintaining signal integrity amidst background noise and channel fading.
Innovation Solution
The system employs a method of wirelessly transmitting and receiving audiovisual information using packetized data with multiple layers of error correction coding, including complementary and redundant streams, which are associated through control information to ensure robust signal processing and presentation on mobile devices, even under adverse conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-layer error correction coding is used in ATSC digital television broadcast, then device complexity is reduced, but reliability deteriorates due to susceptibility to noise and fading at vehicular speeds
Solution Approach 1:
The patent segments the error correction coding into multiple independent layers (first error correction coding layer and second error correction coding layer), where each layer provides protection against different types of errors. This segmentation allows the system to maintain high reliability through multi-layer protection while keeping each individual layer relatively simple in structure.
Solution Approach 2:
The patent employs composite error correction coding by combining different error correction codes (e.g., Reed-Solomon code and convolutional code, or LDPC code and BCH code) into a multi-layer structure. This composite approach leverages the strengths of different coding schemes to achieve superior overall reliability compared to single-layer coding.
2Reliability
If multiple layers of error correction coding are implemented, then reliability improves through complementary and redundant streams, but device complexity increases due to additional encoding and decoding operations
Solution Approach 1:
The patent applies different error correction coding schemes to different portions or layers of the transmitted data stream. Each layer can be optimized for specific error conditions (e.g., one layer for burst errors, another for random errors), allowing the system to achieve high service continuity while managing complexity through localized optimization rather than uniform complex coding throughout.
Solution Approach 2:
The patent implements redundant error correction layers that provide beforehand cushioning against potential data loss. The complementary and redundant streams are prepared in advance with different error correction codes, so that if one layer fails due to noise or fading, the other layers are already in place to compensate, ensuring service continuity without requiring complex real-time decision-making.
3Quantity of substance
If error correction coding information is transmitted in separate streams, then bandwidth utilization improves, but ease of operation deteriorates due to need for association between streams
Solution Approach 1:
The patent introduces synchronization information as an intermediary element that bridges the separate error correction coding streams. This synchronization data contains identification markers and timing information that automatically associate the first and second error correction coding layers with their corresponding audiovisual data portions, eliminating the need for complex manual association while maintaining bandwidth efficiency through separate stream transmission.
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.