Audio Packet Staggering for Reliable 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 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. This involves generating multiple packets with different error correction coding methods and associating them using control information, enabling mobile devices to process and present audiovisual information effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correction coding is applied to audiovisual streams for mobile reception, then reliability of signal reception is improved, but device complexity increases due to multiple coding methods and synchronization requirements
Solution Approach 1:
The audiovisual stream is divided into multiple segments, each protected by different error correction coding methods. The system segments the transport stream into multiple packets and applies different coding schemes (e.g., Reed-Solomon, convolutional coding) to different segments, allowing the receiver to process and reconstruct the original stream even if some segments are corrupted during mobile transmission.
Solution Approach 2:
The system changes the error correction parameters dynamically based on channel conditions. Multiple coding methods with different redundancy levels are prepared, and the receiver selects appropriate coding parameters for reconstruction based on the received signal quality, thereby managing complexity while maintaining reliability under varying mobile reception conditions.
2Object-affected harmful factors
If multiple error correction coding methods are used for different packets, then resistance to adverse conditions is improved, but loss of time increases due to processing multiple coding schemes
Solution Approach 1:
Error correction coding is applied in advance during the transmission preparation phase. Multiple coded versions of the audiovisual data are pre-generated and embedded in the transmitted stream, so that the receiver does not need to perform complex real-time coding operations, thereby reducing processing time while maintaining resistance to noise and fading.
Solution Approach 2:
The patent introduces control information as an intermediary that carries metadata about the error correction coding applied to each packet. This intermediary structure allows the receiver to quickly identify and process only the necessary correction data without analyzing entire packets, significantly reducing processing time while maintaining robustness against adverse transmission conditions.
3Manufacturing precision
If control information is added to associate error correction with audiovisual streams, then manufacturing precision is improved in terms of stream synchronization, but device complexity increases due to additional processing requirements
Solution Approach 1:
The control information structure is designed to serve multiple functions simultaneously: it identifies error correction coding types, links correction data to specific audiovisual packets, and provides synchronization markers. This multi-functionality reduces the need for separate processing mechanisms, thereby managing device complexity while achieving precise stream synchronization.
4Reliability
If packetized transmission with error correction is implemented, then reliability of mobile reception is improved, but loss of information increases due to potential packet loss and correction overhead
Solution Approach 1:
The system implements selective packet discarding and recovery mechanisms. When packet loss is detected, the receiver uses the error correction information from redundant packets to recover the lost audiovisual data. The control information guides the receiver on which packets to discard and which correction data to apply, minimizing information loss while maintaining reception reliability in mobile environments.
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.