Re-multiplexing Apparatus for Synchronizing 2K and 4K Broadcast Data
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Solution Overview
Problem
Existing synchronization methods for 2K and 4K broadcasting, particularly in SFN, face challenges due to varying delay times in IP networks, making it difficult to achieve synchronization using traditional master/slave synchronization methods.
Innovation Solution
A re-multiplexing apparatus that inserts a delay control packet to compensate for differences in delay times between different transmission lines, allowing for synchronization of broadcast data with varying resolutions by adjusting the timing of the modulation process based on an index value of waiting time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If master/slave synchronization is used for SFN in 2K broadcasting with fixed delay transmission line, then synchronization is achieved, but it cannot be applied to 4K broadcasting with IP network having variable delay time
Solution Approach 1:
The patent transitions from static master/slave synchronization (fixed delay assumption) to dynamic delay compensation (variable delay adaptation). The system dynamically calculates and adjusts delay compensation values based on actual transmission conditions, allowing reliable synchronization across both fixed and variable delay networks.
Solution Approach 2:
The patent changes the synchronization parameter from fixed delay time to variable delay compensation time. By introducing a delay compensation value that can be adjusted based on actual transmission conditions, the system adapts to different network characteristics while maintaining synchronization accuracy.
2Reliability
If reference synchronization using absolute standard time is used, then synchronization is achieved, but it cannot be easily applied to existing master/slave synchronization systems
Solution Approach 1:
The patent introduces a delay compensation value as an intermediary parameter that bridges the gap between master/slave synchronization and reference synchronization. This intermediary allows existing master/slave systems to achieve reference-like synchronization accuracy without requiring complete system redesign or absolute standard time infrastructure.
Solution Approach 2:
The patent performs preliminary delay measurement and calculation to determine the delay compensation value before actual transmission. This preliminary action allows the system to pre-establish synchronization parameters, making the transition from master/slave to reference synchronization seamless and compatible with existing systems.
3Adaptability or versatility
If different transmission lines are used for 2K and 4K broadcasting, then network flexibility is improved, but delay time difference causes synchronization failure
Solution Approach 1:
The patent applies delay compensation as a counterweight to offset the delay time difference between different transmission lines. By calculating the delay difference and applying compensatory delay adjustment, the system balances the timing between 2K and 4K broadcasting streams despite using different network paths.
Data Source
AI summary
A re-multiplexing apparatus, a broadcasting system, a re-multiplexing method, and a program capable of, when broadcast data having a first resolution and broadcast data having a second resolution are broadcasted, synchronizing their outputs with each other are provided. A re-multiplexing apparatus includes a first re-multiplexing unit and a second re-multiplexing unit. The second re-multiplexing unit inserts a delay control packet at a timing corresponding to a timing of a first packet of an OFDM frame, the delay control packet being a packet containing control information for compensating for a difference between delay times of the first and second lines. When doing so, the second re-multiplexing unit generates, as the control information, an index value of a waiting time from a time when the delay control packet is received in a transmitting apparatus to a start of a modulation process for a packet following the delay control packet.