Video Line Inversion for Analog Interference Mitigation
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Solution Overview
Problem
Analog video transmission in applications like automotive infotainment and surveillance systems is affected by periodic interference signals, such as electromagnetic interference, which degrade the quality of the video signal and are not effectively addressed by existing technologies.
Innovation Solution
Implementing video line inversion techniques, where the transmitter and receiver adjust the phase of specific video lines to ensure that periodic interference signals are out of phase, reducing their visibility and impact on the received video signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If analog video transmission is used, then cost and simplicity are reduced, but the video signal is affected by periodic interference signals
Solution Approach 1:
The patent applies line inversion technique where every second video line is inverted (phase shifted by 180 degrees) to counteract periodic interference signals. This inversion causes the interference patterns to become out of phase and cancel each other out, while the actual video content is restored through synchronized inversion at both transmitter and receiver ends.
Solution Approach 2:
The patent implements periodic line inversion where alternating video lines are systematically inverted in a regular pattern. This periodic action creates a structured approach to interference cancellation, where the inversion pattern matches the periodic nature of the interference signals, enabling effective mitigation while maintaining video integrity.
2Object-affected harmful factors
If video line inversion is applied, then interference signal impact is reduced, but device complexity increases
Solution Approach 1:
The patent segments the video signal processing into distinct inversion and detection functions at transmitter and receiver ends. By dividing the complexity into manageable segments (inversion logic, phase detection, selective application), the system achieves interference mitigation without overwhelming device complexity.
Solution Approach 2:
The system uses the received video signal itself to detect phase differences and determine when inversion is needed. This self-service approach eliminates the need for external calibration or complex control systems, as the video signal carries its own diagnostic information for adaptive inversion control.
Data Source
AI summary
Disclosed herein are systems and methods that use video line inversion for reducing impact of periodic interference signals on analog transmission of video signals over wired links/connections. In one aspect of the present disclosure, in certain circumstances, a transmitter may be configured to perform video line inversion on a certain subset of video lines of a video signal prior to transmitting the video signal to the receiver, and a receiver may be configured to perform a corresponding inversion for the same subset of video lines of the video signal received at the receiver. Such video line inversion performed by the transmitter and the receiver may advantageously allow reducing or eliminating the impact of periodic interference signals that might affect the video signal during transmission, resulting in an improved quality of the video rendered at the receiver side.