Decoding Device Packet Order Determination Leap Second Adjustment
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Solution Overview
Problem
Receivers face challenges in decoding and reproducing television program information accurately due to changes in weather conditions and leap second adjustments, which disrupt the order of video and audio reproduction in terrestrial digital broadcasting using the ISDB-T scheme and MMT-based media transport.
Innovation Solution
A decoding apparatus and method that determine the order of packets based on adjustment information for Coordinated Universal Time, using order information within packets to ensure correct decoding and reproduction, even during leap second adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If television program information is transmitted via radio waves, then coverage area is improved, but reception reliability deteriorates due to weather conditions
Solution Approach 1:
The patent introduces a communication line as an intermediary transmission path to supplement radio wave transmission. When radio wave reception is difficult, the system switches to or combines with communication line transmission, ensuring continuous and reliable delivery of television program information regardless of weather conditions.
Solution Approach 2:
The system dynamically changes transmission parameters by selecting different transmission paths (radio waves or communication lines) based on reception conditions. This allows the system to adapt to varying environmental conditions while maintaining reliable information delivery.
2Measurement precision
If time stamp of NTP is used for reproduction ordering, then synchronization is improved, but decoding order accuracy deteriorates during leap second adjustments
Solution Approach 1:
The patent segments the time stamp information into two parts: the NTP time stamp for general synchronization and a separate reproduction order indicator for precise decoding sequencing. This segmentation allows the system to handle leap second adjustments by relying on the reproduction order indicator rather than relying solely on continuous time stamp values.
Solution Approach 2:
The reproduction order indicator acts as an intermediary mechanism between the NTP time stamp and the actual decoding process. During leap second adjustments, this intermediary ensures correct decoding order by providing explicit sequencing information that overrides potential time stamp ambiguities.
3Reliability
If multiple transmission paths are used, then reception reliability is improved, but decoding complexity increases
Solution Approach 1:
The patent implements a universal decoding approach where the reproduction order indicator serves as a common mechanism for ordering packets regardless of their transmission path (radio wave or communication line). This multi-functional indicator simplifies the decoding process by providing a unified method for sequence determination across multiple transmission paths.
Data Source
AI summary
To provide: a decoding device that decodes and replays, in a suitable order, sequentially transmitted information; a reception device; a transmission/reception system; a decoding method; and a storage medium having the decoding program stored therein. A decoding unit 21 that decodes packets sent from a transmission device 10. A decoding order determination unit 22 determines the order of packets to be decoded by the decoding unit 21, on the basis of adjustment information that is included in the packet and corresponds to a time adjustment for making Coordinated Universal Time approach Universal Time. The packets include order information indicating the order in the same IP data flow. The decoding order determination unit 22 determines, on the basis of the order information, the order of packets to be decoded by the decoding unit 21, if the adjustment information indicates that a time adjustment will occur.