Digital TV Synchronization Signal Detector Using Delayed Similarity Comparison
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Solution Overview
Problem
Synchronization errors occur in digital TV signals due to noise interference and transmission path variations, which hinder the identification of sync symbols, leading to synchronization failures in digital TV receivers.
Innovation Solution
A synchronization signal detector apparatus and method that delays the data signal, generates similarity signals by comparing the data signal with its delayed version, and determines the synchronization signal based on these similarity signals, using circuits such as slicers, buffering modules, symbol comparators, and decision units to accurately identify sync symbols amidst noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional synchronization detection methods are used, then the system is simple, but synchronization errors occur due to noise and transmission path variations
Solution Approach 1:
The patent applies preliminary action by creating a delayed version of the received signal before comparison. The delay circuit introduces a time offset that allows the synchronization detector to compare the current signal segment with a previous segment, enabling the system to identify sync symbols based on temporal patterns rather than direct matching, thereby improving reliability without excessive complexity
Solution Approach 2:
The patent uses an intermediary approach by introducing a delay element as a mediator between the received signal and the synchronization detection process. This delay circuit acts as an intermediary that transforms the signal into a form that can be effectively compared with reference patterns, allowing noise-resistant synchronization detection
2Reliability
If noise interference is present in the signal, then transmission reliability decreases, but traditional detection methods fail to identify sync symbols accurately
Solution Approach 1:
The system performs preliminary action by pre-computing the delayed signal version, which allows the synchronization detector to compare current signal segments against a time-shifted reference. This preliminary transformation creates a comparison basis that is less sensitive to noise, improving both transmission reliability and identification precision
Solution Approach 2:
The patent implements feedback mechanisms where the delayed signal is continuously compared with the current signal segments, and the synchronization status is fed back to adjust the detection process. This feedback loop allows the system to compensate for noise interference and maintain precise sync symbol identification
Data Source
AI summary
A synchronization signal detector includes: a first circuit configured to delay the data signal by a period of at least one data segment of the data signal to generate a delayed signal; a second circuit configured to produce a plurality of similarity signals according to the data signal and the delayed signal, each of the similarity signals representing the similarity between the data signal and the delayed signal, and a third circuit configured to determine the synchronization signal of the data signal according to the similarity signals. The present invention further provides a method corresponding to the signal detector.