Universal Video Relay Device for AC and DC Signal Compatibility
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Solution Overview
Problem
Existing video transmission systems face issues with mixed AC and DC signal outputs, requiring dedicated relay devices or cables, and suffer from DC shift due to timing differences in correction signal application, affecting usability and reliability.
Innovation Solution
A relay device or connection cable that detects whether the received video signal is AC or DC and controls current pulling accordingly, using a control unit and current pulling unit to manage signal transmission, allowing the same connection cable or relay device to handle both DC and AC signal outputs without distinction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated relay device or connection cable is prepared for each video transmission device type (AC signal output or DC signal output), then the video signal transmission reliability is improved, but the device complexity and usability deteriorate due to needing multiple different cables or devices
Solution Approach 1:
The connection cable is designed with a control unit that can automatically detect whether the connected video transmission device outputs AC or DC signals, and automatically switch between different signal processing modes. This allows a single universal connection cable to replace multiple dedicated cables, improving usability while maintaining transmission reliability through automatic adaptation to different signal types
2Adaptability or versatility
If a correction signal is applied to an AC signal output to create a DC signal output, then the signal compatibility is improved, but DC shift occurs between the differential signal lines due to time difference in correction signal application
Solution Approach 1:
The control unit detects the signal type (AC or DC) in advance before signal transmission begins, and pre-configures the appropriate signal processing mode. This preliminary detection and configuration prevents DC shift issues by ensuring the correct processing mode is active before the video signal is transmitted, rather than attempting to correct AC signals during transmission
Data Source
AI summary
A relay device or a connection cable for relaying a video signal from a transmission device to a reception device includes a control unit for detecting whether the received video signal is an AC signal output or a DC signal output, and a current pulling unit for pulling a predetermined current from the received video signal. If the received video signal is an AC signal output, the control unit is configured to control the current pulling unit to pull the predetermined current. If the received video signal is a DC signal output, the control unit is configured to control the current pulling unit to stop the pulling of current, and to transfer the video signal from the transmission device to the reception device.