Uncoded Transport Tunneling for Mobile TV Stream Compatibility
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Solution Overview
Problem
Current ATSC digital television broadcast systems face challenges in mobile reception, especially at vehicular speeds, and lack a seamless method to integrate extensions into the existing framework for improved mobile reception of digital television signals.
Innovation Solution
The system employs a method of encoding audiovisual information using a combination of error correction coding methods, including convolutional and systematic block coding, with control information indicating the type of encoding used, allowing for the differentiation of service versions and enabling forward compatibility by creating an 'uncoded transport tunnel' within the existing framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the ATSC standard uses a single error correction coding method for all services, then the system maintains simplicity and compatibility, but it cannot provide optimized error correction for different service types and mobile reception conditions
Solution Approach 1:
The transport stream is segmented into different service types (broadcast services and data services) with distinct error correction coding methods. Broadcast services use conventional coding while data services use the uncoded transport tunnel, allowing each segment to be optimized independently for its specific requirements
Solution Approach 2:
Different error correction coding methods are applied to different parts of the transport stream based on service type. The uncoded transport tunnel provides a dedicated local pathway for data services that requires different error correction characteristics compared to traditional broadcast services
2Adaptability or versatility
If the system integrates new service extensions into the existing ATSC framework, then forward compatibility is improved, but the complexity of blending different coding methods increases
Solution Approach 1:
The uncoded transport tunnel acts as an intermediary mechanism that allows new data services to be integrated into the existing ATSC framework without disrupting traditional broadcast services. It provides a bridge between legacy systems and new services with different requirements
Solution Approach 2:
The transport stream structure is designed to accommodate multiple service types simultaneously - both traditional broadcast services with error correction and new data services through the uncoded transport tunnel - making the system universally compatible with multiple service requirements
3Reliability
If error correction coding is applied to all audiovisual information, then reception robustness is improved, but data transmission efficiency and flexibility for different service types deteriorates
Solution Approach 1:
Error correction coding is applied partially - only to broadcast services that require high robustness - while data services transmitted through the uncoded transport tunnel use alternative error handling, avoiding excessive coding that would reduce transmission efficiency
Data Source
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.