Video Receiver Timing Correction for Display Stability
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Solution Overview
Problem
Video distribution networks face instability issues due to video sources transmitting digital video signals that do not conform to standard formats, leading to improper display of video signals.
Innovation Solution
A video receiver with detection and correction blocks is implemented to estimate and measure video signal parameters, determining differences within specific thresholds to correct vertical synchronization, horizontal synchronization, and data enable signals, ensuring stable video transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video signals from unstable video sources are transmitted through the network, then video distribution is maintained, but video display stability deteriorates
Solution Approach 1:
The patent introduces a video receiver as an intermediary device between the video source and display. This receiver detects timing signal parameters (horizontal pixels, vertical scan lines, active pixels, active scan lines) and corrects deviations from expected values, thereby stabilizing the video signal before it reaches the display device.
Solution Approach 2:
The system implements feedback by measuring actual timing parameters from the received video signal and comparing them against expected values. When deviations are detected beyond acceptable thresholds, the receiver automatically adjusts and corrects the timing signals to maintain stable video display.
2Reliability
If video signal correction is implemented, then video display stability is improved, but device complexity increases
Solution Approach 1:
The video receiver is segmented into distinct functional blocks: a detection block that measures timing parameters, a vertical synchronization correction block, a horizontal synchronization correction block, and a data enable correction block. This segmentation allows each block to handle specific correction tasks independently, making the overall system more manageable despite the increased functionality.
3Reliability
If timing parameter measurement and correction are performed, then video signal stability is improved, but processing time increases
Solution Approach 1:
The system performs preliminary measurement of timing parameters (horizontal pixels, vertical scan lines, active pixels, active scan lines) and comparison against expected values during the video signal reception process. By detecting and preparing corrections in advance within the same processing cycle, the system minimizes additional latency while ensuring stable video display.
Data Source
AI summary
An input card of video switcher includes a detection block for detecting errors in the timing signals of a digital video signal within a range. For timing signals with errors that fall within the range, the input card implements a correction block to correct the signals to an expected resolution. For timing signals with errors that fall out of the range, the input card does implement the correction block and passes the raw timing signal through.