Modulation Information Packets for DVB-T2 Synchronization
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Solution Overview
Problem
In digital terrestrial broadcasting networks, particularly those following the DVB-T2 standard, it is challenging for rebroadcast sites to generate finely synchronized radio frequency signals as they do not have access to the T2-MI packets used by the modulators of broadcast sites, making it difficult to maintain synchronization across the network.
Innovation Solution
A method is introduced where modulation information packets are inserted into the transport stream at specific positions, allowing rebroadcast sites to reconstruct a modified global flow from the radio frequency signal received from broadcast sites, ensuring synchronization by using modulation parameters and information packets to recreate the original global stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If rebroadcast sites generate radio frequency signals from received signals without access to T2-MI packets, then network coverage is extended, but synchronization precision deteriorates
Solution Approach 1:
The patent introduces modulation information packets as an intermediary carrier that transports essential synchronization data (modulation parameters, frame structure information, timing data) from broadcast sites to rebroadcast sites. These packets act as a mediator that enables rebroadcast sites to reconstruct the global stream with precise synchronization without direct access to the original T2-MI packets, thus resolving the contradiction between extending coverage and maintaining synchronization precision.
Solution Approach 2:
The patent implements preliminary encoding of synchronization information into modulation information packets at the broadcast site before transmission. By pre-packaging all necessary modulation parameters and timing data in advance, rebroadcast sites can directly use this prepared information to generate synchronized signals without needing access to the original T2-MI packets, thereby maintaining synchronization precision while extending network coverage.
2Measurement precision
If modulation information packets are inserted into transport stream, then synchronization is improved, but data stream complexity increases
Solution Approach 1:
The patent designs modulation information packets with multi-functionality, where a single packet structure carries multiple types of information including modulation parameters, frame synchronization data, and timing information. This universal packet design improves synchronization while avoiding the need to insert multiple separate data streams, thus limiting the increase in overall data stream complexity.
Data Source
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AI summary
The invention relates to a method for generating an original whole data stream intended to be distributed to at least one broadcasting site comprising a modulator and a transmitter transmitting a radiofrequency signal at a first frequency, implementing the following steps: - obtaining (31) at least one transport stream comprising at least one transport packet; - obtaining (32), on the basis of at least one modulation parameter of said broadcasting site, at least one start time of a modulation frame intended to be transmitted by said broadcasting site; - inserting (33) at least one modulation data packet into said at least one transport stream, at a position defined based on said at least one start time; and - generating (34) said original whole data stream.