DTV Enhanced Data Framing for Noise-Resistant Broadcast Reception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital television (DTV) systems face challenges in transmitting supplemental data due to signal degradation caused by noise and ghost effects, especially in indoor environments with obstacles, which can lead to errors in critical data transmission, and existing systems are not compatible with conventional DTV 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 compatibility is maintained, but the receiving performance deteriorates in poor channel environments
Solution Approach 1:
The transmitted signal is segmented into two distinct parts: main data (video/audio) and enhanced data (supplemental information). By dividing the data stream and applying different encoding strategies to each segment, the system maintains compatibility for main data while providing improved error protection for enhanced data, resolving the contradiction between system compatibility and receiving performance.
Solution Approach 2:
Different quality levels of error protection are applied to different parts of the data stream. Enhanced data receives additional error correction coding and more robust modulation, while main data uses conventional encoding. This local differentiation allows the system to optimize for supplemental data reliability without compromising overall system compatibility.
2Reliability
If additional encoding is applied to enhanced data, then the noise resistance is improved, but the device complexity increases
Solution Approach 1:
The encoding process is segmented into two paths: a simplified path for main data and an enhanced path for enhanced data. The additional encoding operations (outer code encoding, enhanced modulation) are applied only to enhanced data segments, providing improved noise resistance without requiring the entire system to handle the full complexity of dual encoding for all data types.
Solution Approach 2:
Instead of applying full error correction to all data, the system applies partial action by using enhanced encoding only where needed (for enhanced data). This selective approach provides sufficient noise resistance for critical supplemental information while avoiding the excessive complexity that would result from universal enhanced encoding.
3Reliability
If error correction is enhanced for supplemental data, then the data transmission accuracy is improved, but the processing time increases
Solution Approach 1:
Data transmission is segmented into parallel streams with different processing requirements. Enhanced data undergoes additional error correction encoding, while main data follows the conventional faster path. This segmentation allows the system to achieve high accuracy for supplemental data without requiring all data to undergo time-consuming enhanced processing.
Solution Approach 2:
The system applies partial error correction enhancement only to enhanced data rather than all data. This selective approach provides the necessary transmission accuracy for critical supplemental information while minimizing the time loss that would occur if all data streams underwent the same enhanced processing.
Data Source
AI summary
A DTV transmitting system includes a frame encoder, a randomizer, a block processor, a group formatter, a deinterleaver, and a packet formatter. The frame encoder builds an enhanced data frame and adds parity data into the data frame. The frame encoder further divides the data frame into first and second sub-frames including first and second portions of the parity data, respectively, and permutes a plurality of the first sub-frames and a plurality of the second sub-frames, respectively. The randomizer randomizes enhanced data in the permuted sub-frames, and the block processor codes the randomized data at a rate of 1/N1. The group formatter forms a group of enhanced data having one or more data regions and inserts the 1/N1 coded 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 enhanced data packets.