Digital Data Stream Bitrate Modification via Packet Insertion
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Solution Overview
Problem
Current techniques for modifying the bitrate of digital data streams in SFN networks are complex and costly, requiring significant architectural changes and additional equipment, while also relying on external reference signals like GPS.
Innovation Solution
A method that modifies the bitrate of digital data streams by inserting or deleting packets based on marker information and timestamping, allowing for deterministic flow rate changes without external references, and maintaining compliance with broadcasting standards like DVB-T, DVB-H, and DTMB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current techniques are used to modify the bitrate of digital data streams in SFN networks, then the bitrate modification can be achieved, but the system complexity and cost increase significantly requiring additional equipment and architectural changes
Solution Approach 1:
The patent extracts the essential synchronization information (timestamps and markers) from the data stream and uses only this extracted information to control packet insertion/deletion. This eliminates the need for complex external reference signal processing while maintaining deterministic bitrate modification capability.
Solution Approach 2:
The synchronization markers and timestamps in the data stream serve multiple functions: they enable both SFN network synchronization and bitrate modification control. This multi-functionality eliminates the need for separate external reference signals and reduces system complexity.
2Productivity
If current techniques are used to modify the bitrate, then the modification can be performed, but additional equipment and architectural changes are required increasing cost
Solution Approach 1:
The data stream's own synchronization markers and timestamps are used to control the bitrate modification process. The system serves itself by using its intrinsic synchronization information rather than requiring external reference signals from GPS or other sources, eliminating additional equipment costs.
Solution Approach 2:
The patent changes the bitrate by dynamically adjusting packet insertion/deletion based on timestamp analysis. This parameter-based control approach replaces hardware-intensive solutions with software-based timestamp processing, reducing implementation cost.
3Reliability
If external reference signals like GPS are used for synchronization, then synchronization accuracy is maintained, but the system becomes dependent on external signals increasing complexity
Solution Approach 1:
The patent uses synchronization markers embedded in the data stream as an intermediary to transfer timing information. These markers act as a mediator between the original transmission timing and the bitrate modification process, eliminating the need for direct external reference signal connections.
Solution Approach 2:
The patent replaces the mechanical/physical external reference signal system (GPS antennas, receivers) with a software-based timestamp processing system. The timing information is carried electronically within the data stream itself, substituting physical reference signal infrastructure with digital timestamp analysis.
Data Source
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AI summary
The invention relates to a method modifying the throughput of an original data stream organized in two successive packets. According to the invention, such a method of insertion comprises: - searching for at least one marker present in said original data stream; - extracting at least one item of information, carried by said marker, relating to the start-of-recurrence instant; - determining, for each of said packets of said original data stream, a time-stamping information item; - determining, on the basis of said information relating to the start-of-recurrence instant and of at least one of said items of information relating to time stamping, a start-of-recurrence packet in said original data stream; - modifying said original data stream by inserting or deleting at least one packet determined on the basis of said determined start-of-recurrence packet, delivering a modified data stream.