Multimedia Stream Tunneling for Robust Mobile TV Reception
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Solution Overview
Problem
Current ATSC digital TV broadcast systems face challenges in mobile reception, particularly at vehicular speeds, and lack a seamless method to integrate extensions into the existing framework for improved mobile service delivery.
Innovation Solution
The system employs a method of encoding audiovisual information using a first error correction coding method for some packets and a second method for others, with control information indicating the difference, allowing for 'uncoded transport tunneling' that enables future service versions to be integrated within the existing framework, ensuring forward compatibility and robust mobile reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single error correction coding method is used for all packets in the ATSC broadcast system, then the system maintains simplicity and compatibility with legacy devices, but mobile reception robustness deteriorates when moving at vehicular speeds
Solution Approach 1:
The patent segments the audio-visual information stream into multiple packets, applying different error correction coding methods to different packets. Specifically, it uses a first error correction coding method for some packets and a second error correction coding method for other packets, allowing the system to optimize for both legacy and mobile device compatibility while improving overall reception robustness
Solution Approach 2:
The patent introduces dynamic adaptability by enabling the broadcast system to transmit packets with varying error correction characteristics. The system can dynamically adjust which packets receive which level of error correction based on the service version and receiver capabilities, making the system flexible enough to handle both stationary and mobile reception conditions
2Adaptability or versatility
If the ATSC standard is extended with improvements for mobile reception, then mobile service delivery is enhanced, but the ability to blend extensions into the existing framework deteriorates
Solution Approach 1:
The patent creates a universal error correction framework where a single broadcast transmission can simultaneously serve both legacy stationary devices and newer mobile devices. By incorporating multiple error correction coding methods within the existing ATSC packet structure, the system achieves multi-functionality without requiring separate broadcast streams or fundamentally altering the ATSC framework
Solution Approach 2:
The patent nests new error correction capabilities within the existing ATSC broadcast framework. The different error correction coded packets are integrated into the standard transport stream structure, allowing extensions for mobile reception to be embedded within the original system architecture rather than requiring a complete overhaul
3Reliability
If all packets are encoded with strong error correction for mobile reception, then reception robustness improves, but data transmission efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent applies local quality by providing enhanced error correction only to specific packets that benefit most from it, rather than uniformly applying strong error correction to all packets. This selective approach ensures that packets requiring higher reliability (such as those critical for mobile reception) receive stronger protection, while other packets maintain their original efficiency
Data Source
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AI summary
A system and method for wirelessly transmitting audiovisual information. First audiovisual information may be encoded using a first error correction coding method. A plurality of packets may be generated, including the first audiovisual information, second audiovisual information, and control information. The second audiovisual information may not be encoded using the first error correction coding method, and the control information may indicate this. The plurality of packets may be wirelessly transmitted. The control information may be usable by a receiver to determine that the second audiovisual information is not encoded using the first error correction coding method, and may thereby determine that the second audiovisual information is a different service version than the first audiovisual information.