Digital TV Broadcast Framing for Robust Supplemental Data Reception
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Solution Overview
Problem
Current digital television systems face challenges in transmitting supplemental data due to signal degradation caused by noise and ghost effects, particularly in indoor environments with obstacles, which can lead to errors in critical data such as program execution files and stock information, necessitating a system resistant to noise and compatible with existing digital broadcasting systems.
Innovation Solution
A digital broadcasting system employing a transmitting system with first and second frame encoders for error correction, interleaving, and multiplexing, and a receiving system with demodulation, equalization, and decoding processes to enhance the robustness and error correction of supplemental data, ensuring compatibility with conventional 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 signal quality deteriorates due to noise and ghost effects especially in indoor environments
Solution Approach 1:
The transmission channel is segmented into different time slots: one for video/audio data and another for supplemental data. This segmentation allows conventional receivers to ignore the supplemental data portion while new receivers can utilize it, maintaining backward compatibility while enabling reliable supplemental data transmission with dedicated error correction coding.
Solution Approach 2:
Error correction codes are applied preliminarily to supplemental data before transmission. This preliminary error protection ensures that even when supplemental data is transmitted over the same channel as video/audio data, the critical supplemental information can be recovered accurately despite noise and ghost effects.
2Reliability
If error correction coding is applied to supplemental data, then the error rate decreases, but the transmission time increases
Solution Approach 1:
Error correction coding is applied selectively only to supplemental data rather than all broadcast content. This partial application provides necessary error protection for critical information while minimizing the time overhead, as video/audio data transmission proceeds without additional error correction processing.
Data Source
AI summary
A method of processing data in a receiving system, the method includes receiving a broadcast signal including a plurality of data groups that include broadcast data and first parity data; demodulating the received broadcast signal; performing first decoding on the broadcast data in a frame based on the first parity data for error correction, wherein the frame is formed based on the plurality of data groups in the demodulated broadcast signal and wherein the plurality of groups have a same size; and de-randomizing the first decoded broadcast data, wherein second decoding on the broadcast data in the frame is selectively performed, wherein the broadcast signal further includes signaling information that contains a transmission parameter to indicate whether second encoding was performed on the broadcast data in a transmitting system, wherein, when the transmission parameter indicates that the second encoding was performed on the broadcast data.