DTV Supplemental Data Formatting for Noise and Ghost Resistance
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Solution Overview
Problem
Current digital television systems face challenges in transmitting supplemental data due to signal degradation from noise and ghost effects, particularly in indoor environments with mobile objects, which can lead to errors in critical data transmission, such as program execution files and stock information, requiring a system resistant to noise and compatible with existing digital television receivers.
Innovation Solution
A digital television transmitting system that includes an encoder, randomizer, block processor, group formatter, deinterleaver, and packet formatter to perform additional encoding and multiplexing of enhanced data, enhancing its resistance to noise and channel changes, ensuring robust transmission and compatibility with conventional receiving systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If supplemental data is transmitted through the same channel as video/audio data using time-division method, then the broadcast system maintains compatibility with conventional receiving systems, but the receiving performance deteriorates in poor channel environments due to noise and ghost effects
Solution Approach 1:
The patent segments the transmission channel into two distinct paths: a main path for video/audio data and an auxiliary path for supplemental data. This segmentation allows supplemental data to be transmitted with enhanced error correction specifically tailored for data integrity, while video/audio data uses conventional transmission methods, thus resolving the contradiction between compatibility and reliability.
Solution Approach 2:
The patent applies different transmission qualities to different data types. Supplemental data receives higher quality treatment with additional error correction encoding and dedicated transmission resources, while video/audio data maintains standard transmission quality. This local quality differentiation ensures data integrity for critical supplemental information without compromising overall system compatibility.
2Reliability
If additional error correction encoding is applied to supplemental data, then the resistance to noise and ghost effects improves, but the device complexity increases
Solution Approach 1:
The patent applies preliminary error correction encoding to supplemental data before transmission. By pre-encoding the data with robust error correction codes, the system prepares the data to withstand noise and ghost effects during transmission, thereby improving reliability without requiring complex real-time processing at the receiver.
Solution Approach 2:
The patent introduces an intermediary encoding layer specifically for supplemental data that acts as a mediator between the data source and the transmission channel. This intermediary error correction layer protects the supplemental data from channel impairments without affecting the main video/audio data path, thus improving reliability while keeping the overall system complexity manageable through targeted protection.
Data Source
AI summary
A DTV transmitting system includes an encoder, a randomizer, a block processor, a group formatter, a deinterleaver, and a packet formatter. The encoder codes enhanced data for error correction, permutes the coded data, and further codes the permuted data for error detection. The randomizer randomizes the coded enhanced data, and the block processor codes the randomized data at an effective coding rate of 1/H. The group formatter forms a group of enhanced data having data regions, and inserts the coded enhanced data into at least one of the data regions. The deinterleaver deinterleaves the group of enhanced data, and the packet formatter formats the deinterleaved data into corresponding data bytes.