Audiovisual Stream Association for Robust Mobile TV 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 types of error correction coding and control information to associate and synchronize error correction with audiovisual streams, allowing for robust transmission and reception even under adverse conditions by using complementary and overlapping error correction patterns across different streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction coding is applied to protect audiovisual streams during mobile transmission, then reliability of reception is improved, but device complexity increases due to multiple coding schemes
Solution Approach 1:
The error correction mechanism is segmented into two distinct parts: a first error correction code applied to the audiovisual stream and a second error correction code applied to control information. This segmentation allows each code to be optimized for its specific purpose while maintaining overall system reliability without excessive complexity
Solution Approach 2:
Control information acts as an intermediary that links the second error correction code to the first error correction code. The control information contains instructions that enable the receiver to properly associate and apply the second error correction code to protect the audiovisual stream, reducing the need for complex direct integration
2Reliability
If multiple error correction coding schemes are used to protect against burst noise and deep channel fading, then susceptibility to reception issues is reduced, but loss of time increases due to processing overhead
Solution Approach 1:
The control information containing instructions for applying the second error correction code is transmitted along with the audiovisual stream. This preliminary provision of control information allows the receiver to prepare and apply error correction processing efficiently without time-consuming discovery or negotiation during playback
Solution Approach 2:
The system changes the parameters of error correction by using two different error correction codes with different characteristics. The first code provides baseline protection while the second code, applied according to control information, provides additional protection against specific channel conditions like burst noise and deep fading, achieving better reliability without uniform processing overhead
3Adaptability or versatility
If error correction coding information is transmitted in a separate stream from audiovisual information, then adaptability to different reception conditions is improved, but loss of information increases if association between streams is lost
Solution Approach 1:
Control information serves as an intermediary that explicitly associates the second error correction code with the first error correction code and the audiovisual stream. This control information is transmitted in the same stream as the audiovisual data, ensuring that the association metadata travels with the data it describes and cannot be lost separately
Solution Approach 2:
The control information is nested within the audiovisual stream, containing embedded instructions that link the second error correction code to the first error correction code. This nesting ensures that the association information travels with the audiovisual data it protects, preventing loss of association while maintaining adaptability
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.