Transmission Stream Payload Stuffing Without Adaptation Field Headers
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Solution Overview
Problem
The use of adaptation field headers in digital broadcast systems reduces data transmission efficiency due to the occupation of payload space, degrading the overall data transmission performance.
Innovation Solution
A transmission stream generating device that stuffs supplementary data into the payload area of packets without adaptation fields, using an adapter unit to construct packets with adaptation fields and a stuffing unit to insert supplementary data into the payload regions of packets lacking adaptation fields, thereby improving data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adaptation field headers are used to transmit supplementary data, then data transmission capability is improved, but data transmission efficiency deteriorates due to payload space occupation
Solution Approach 1:
The patent extracts the adaptation field header (a fixed 2-byte structure) from the data transmission path and replaces it with a flexible 1-byte indicator field. This removal of the redundant header structure allows the entire payload region to be used for data transmission, directly resolving the contradiction between transmission capability and efficiency.
Solution Approach 2:
The patent changes the parameter structure of the adaptation field from a fixed 2-byte header format to a 1-byte indicator format. This parameter change reduces the overhead from 2 bytes to 1 byte per packet, thereby improving data transmission efficiency while maintaining the capability to transmit supplementary data through the indicator values.
2Ease of manufacture
If adaptation field headers are used to define adaptation fields, then data structure organization is improved, but payload space is reduced
Solution Approach 1:
The patent extracts and removes the redundant adaptation field header structure, keeping only the essential 1-byte indicator field. This extraction maintains data structure organization through the indicator system while eliminating the 2-byte header overhead, thereby increasing the effective payload space available for data transmission.
Solution Approach 2:
The patent replaces the complex 2-byte adaptation field header with a simple 1-byte indicator that serves the same organizational function. This simplified structure acts as a disposable, lightweight alternative that provides necessary data organization without the space cost of the original header structure.
3Adaptability or versatility
If 2-byte adaptation field headers are provided in every packet, then data transmission flexibility is improved, but data transmission rate deteriorates
Solution Approach 1:
The patent extracts the unnecessary portion of the adaptation field header, reducing it from 2 bytes to 1 byte. This extraction maintains data transmission flexibility through the indicator system while removing half of the header overhead, thereby improving the data transmission rate by increasing the effective payload proportion.
Solution Approach 2:
The patent changes the header size parameter from 2 bytes to 1 byte, fundamentally altering the packet structure efficiency. This parameter change reduces the non-data portion of each packet by 50%, directly improving the data transmission rate while the 1-byte indicator maintains the necessary flexibility for different data types.
Data Source
AI summary
A transmission stream (TS) generating apparatus includes an adaptor which receives general data and generates a stream having a plurality of packets, and which provides adaptive field in some of the plurality of packets, and an inserter which inserts additional data into all the payload areas of some of the plurality of packets that are not provided with the adaptive fields. Because additional data is transmitted, without requiring adaptive field header in certain packet, a data transmission rate is increased.