Audio Packet Jitter Mitigation in Bursty TV Transmission
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Solution Overview
Problem
The introduction of enhanced data packets in digital television transmission systems causes packet jitter in legacy receivers due to buffer limitations, as these receivers are not designed to handle the repositioning of main signal packets forced by the transmission of enhanced data.
Innovation Solution
A method of prioritizing the packing of main stream audio and non-audio data into an output data stream, while incorporating enhanced data, where audio data is packed with higher priority than non-audio data, and ignoring delayed null packets to minimize packet displacement and buffer overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced data packets are introduced into the digital television transmission system, then the robustness and reliability of data transmission is improved, but packet jitter occurs in legacy receivers due to buffer limitations
Solution Approach 1:
The transmission system is segmented into enhanced data packets with additional coding for robustness and main signal packets for legacy compatibility. By separating these data types and applying different coding strategies to each segment, the system achieves both improved reliability through enhanced coding and maintains ease of operation for legacy receivers that only process main signal packets.
Solution Approach 2:
Different coding qualities are applied to different portions of the data stream. Enhanced data packets receive more robust coding with higher redundancy for improved reliability, while main signal packets maintain standard coding to ensure compatibility with legacy receivers. This local differentiation of quality allows the system to simultaneously improve reliability where needed while maintaining ease of operation for legacy systems.
2Adaptability or versatility
If main signal packets are relocated to new time locations to accommodate enhanced data packets, then the transmission of enhanced data is enabled, but packet jitter increases causing buffer overflow in legacy receivers
Solution Approach 1:
The invention extracts the enhanced data transmission capability from the legacy transmission framework by introducing separate enhanced data packets with distinct timing and coding characteristics. This extraction allows the system to gain adaptability for enhanced data while isolating the main signal packet timing that legacy receivers depend on, thereby preventing buffer overflow and maintaining reliability for legacy systems.
Solution Approach 2:
The enhanced data packets act as an intermediary layer between the legacy transmission system and the need for more robust data transmission. By inserting these packets without displacing main signal packets from their expected time locations, the system enables enhanced data transmission while maintaining the timing structure that legacy receivers require to prevent buffer overflow.
3Quantity of substance
If larger groups of packets are displaced to transmit enhanced data, then the capacity for enhanced data transmission is increased, but the complexity of buffer management increases and packet jitter becomes problematic
Solution Approach 1:
The data stream is segmented into distinct enhanced data packets and main signal packets with clear delimiters and timing relationships. This segmentation allows legacy receivers to easily identify and process only the main signal packets they need, while enhanced data packets are handled separately by capable receivers. The segmentation reduces buffer management complexity for legacy systems while enabling increased quantity of enhanced data transmission.
Solution Approach 2:
The system performs preliminary organization of packets into separate enhanced and main signal categories before transmission, with pre-established timing relationships and synchronization mechanisms. This preliminary action allows legacy receivers to simply follow the established timing pattern without complex real-time buffer management, while still enabling increased transmission capacity for enhanced data through the pre-organized packet structure.
Data Source
AI summary
Audio packets occupy spaces in a packet stream so as to reduce packet jitter in a receiver.