Transmission Stream Payload Stuffing Without Adaptation Field Overhead
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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, thereby improving data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptation field headers are used to transmit supplementary data, then data transmission reliability is improved, but data transmission efficiency deteriorates due to payload space occupation
Solution Approach 1:
The patent extracts the adaptation field header (2 bytes) from the packet structure and eliminates its use for supplementary data transmission. Instead, supplementary data is directly inserted into the payload area of packets that would otherwise carry only normal data, removing the overhead and improving transmission efficiency while maintaining reliability through error correction coding.
Solution Approach 2:
The patent changes the packet structure parameter by allowing packets to exist in two states: those with adaptation fields for normal data and those without adaptation fields for supplementary data. This parameter change enables flexible allocation of payload space, eliminating the need for adaptation field headers when transmitting supplementary data and thereby improving data transmission efficiency.
2Adaptability or versatility
If adaptation fields are provided in packets to transmit supplementary data, then adaptability is improved, but data transmission efficiency deteriorates due to header overhead
Solution Approach 1:
The patent implements a dynamic packet structure where the presence or absence of adaptation fields is determined based on the type of data being transmitted. Packets carrying supplementary data omit adaptation fields entirely, while packets carrying normal data include them. This dynamic approach allows the system to adapt to different data types while maximizing transmission efficiency for each case.
Solution Approach 2:
The patent applies different packet structures to different data types: packets containing supplementary data use a simplified structure without adaptation fields, while packets containing normal data use the standard structure with adaptation fields. This local differentiation optimizes each packet type for its specific purpose, improving overall system adaptability and efficiency.
3Ease of operation
If adaptation field headers are used for supplementary data transmission, then ease of operation is improved, but data transmission efficiency deteriorates
Solution Approach 1:
The patent removes the adaptation field header mechanism from the data transmission process and replaces it with direct payload insertion. This extraction of the overhead mechanism simplifies the transmission process for supplementary data while eliminating the 2-byte header penalty, thereby improving both ease of operation and data transmission efficiency simultaneously.
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.