Digital TV Broadcast Encoding for Robust Supplemental Data Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital television systems face challenges in transmitting supplemental data due to signal degradation from noise and ghost effects, particularly in indoor environments with blockages, which can lead to errors in critical data transmission, and existing systems are not compatible with conventional digital television receivers.
Innovation Solution
A digital television transmitting and receiving system that includes a frame encoder, randomizer, block processor, group formatter, deinterleaver, and packet formatter for encoding and processing enhanced data, and a tuner, demodulator, equalizer, block decoder, data formatter, and frame decoder for error correction and noise resistance, 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 receiving performance deteriorates in poor channel environments due to noise and ghost effects
Solution Approach 1:
The transmitted signal is segmented into two distinct parts: main data (video/audio) and enhanced data (supplemental information). Each segment is processed separately with different encoding schemes - main data uses conventional encoding while enhanced data uses robust encoding with additional error correction. This segmentation allows the system to maintain compatibility for main data while providing improved reliability for enhanced data through separate processing paths.
2Reliability
If additional encoding is applied to enhanced data, then noise resistance and error correction capability are improved, but the device complexity increases
Solution Approach 1:
The system merges conventional main data transmission with enhanced data transmission in a unified broadcast framework. The enhanced data encoder combines robust encoding techniques with the existing main data stream, allowing both data types to be transmitted through the same channel infrastructure. This merging approach achieves improved error correction without requiring entirely separate transmission systems, thereby limiting the increase in device complexity.
3Productivity
If enhanced data is multiplexed with main data, then the broadcast channel utilization is improved, but the data processing complexity increases
Solution Approach 1:
The system employs periodic time-division multiplexing where enhanced data and main data are transmitted in alternating time slots. During specific time periods, enhanced data with robust encoding is transmitted; during other periods, main data is transmitted. This periodic structure simplifies the multiplexing process compared to continuous interleaving, as the switching between data types follows a regular pattern that is easier to manage and process.
Data Source
AI summary
A method of processing broadcast data in a broadcast transmitting system, the method includes randomizing, by a hardware processor, the broadcast data; first encoding, by the hardware processor, the randomized broadcast data to add first parity data for first forward error correction; second encoding, by the hardware processor, the first-encoded broadcast data to add second parity data for second forward error correction; permuting the second-encoded broadcast data; block interleaving, by the hardware processor, the permuted broadcast data; third encoding signaling information for signaling the broadcast data to add parity data; fourth encoding the third-encoded signaling information at a code rate; block interleaving the fourth-encoded signaling information; modulating the block-interleaved broadcast data and the block-interleaved signaling information; and transmitting a broadcast signal including the modulated broadcast data and the modulated signaling information.