Wireless AV Broadcast Packets with Frequency-Separated Error Correction
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Solution Overview
Problem
The existing ATSC digital TV broadcast system faces 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
A system and method for wirelessly transmitting and receiving audiovisual information using packetized data with multiple layers of error correction coding, where control information associates error correction coding with audiovisual information, allowing for robust transmission and reception even under adverse conditions, utilizing techniques like main stream augmentation, nested stream encoding, and stagger casting to ensure uninterrupted service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard ATSC digital TV broadcast is used for mobile reception, then bandwidth efficiency is maintained, but reception reliability deteriorates under vehicular speeds and adverse conditions
Solution Approach 1:
The broadcast signal is segmented into multiple packets with different error correction coding patterns. Each packet contains a portion of the audiovisual information with specific error correction codes, allowing the receiver to reconstruct the complete signal even if some packets are corrupted by noise or fading during mobile reception
Solution Approach 2:
The system uses composite error correction coding by combining multiple error correction codes (such as Reed-Solomon and convolutional codes) with different characteristics. This composite approach creates a more robust coding scheme that withstands both random errors from noise and burst errors from deep fading, significantly improving reception reliability in mobile environments
2Reliability
If multiple error correction coding patterns are transmitted separately, then error correction capability is improved, but transmission complexity increases
Solution Approach 1:
Multiple error correction coded packets are merged into a single multiplexed transmission stream. The system combines packets with different error correction patterns (e.g., some with higher redundancy for fading resistance, others optimized for noise) into one unified broadcast signal, maintaining improved error correction capability while simplifying transmission infrastructure and reducing the complexity of separate transmission systems
Solution Approach 2:
The broadcast system is designed with universal packet structures that can carry multiple types of error correction codes within the same transmission framework. This multi-functional packet design allows a single transmission system to handle various error conditions (noise, fading, interference) without requiring separate specialized transmission paths, thereby reducing overall system complexity while maintaining robust error correction
Data Source
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AI summary
A method for transmitting audiovisual information in a wireless manner comprises: generating a first plurality of packets, wherein the first plurality of packets comprise first audiovisual information; generating a second plurality of packets, wherein the second plurality of packets comprise first error correction coding information for the first audiovisual information; generating control information, wherein the control information comprises commands for associating the first error correction coding information with the first audiovisual information; transmitting the first plurality of packets, the second plurality of packets, and the control information in a wireless manner. In order to reduce the susceptibility of the receiving device to specific reception issues, the first plurality of packets and the second plurality of packets are transmitted separated in frequency and the control information indicates that the first plurality of packets and the second plurality of packets are transmitted separated in frequency.