Protocol Exchange in Analog Video Vertical Blanking Interval
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Solution Overview
Problem
Existing methods for controlling video transmission systems, such as using separate control cables or single video transmission cables, face issues with system security and error correction during communication, particularly in receiving instructions for camera control.
Innovation Solution
A protocol transmission method and apparatus that indicate protocol signals within the vertical blanking interval (VBI) of an analog video signal, allowing for secure and error-corrected communication through a coaxial cable, including the transmission of protocol signals for camera control and equalizing pattern signals for signal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate control cable is used to transfer instructions from video transmission/reception system to camera, then communication reliability is improved, but system complexity and security issues worsen
Solution Approach 1:
The patent combines control signal transmission and video signal transmission into a single coaxial cable. The control signals are modulated onto the vertical blanking interval (VBI) of the video signal, allowing both signals to share the same physical medium. This eliminates the need for separate control cables while maintaining communication reliability through the integrated transmission approach.
2Device complexity
If a single video transmission cable is used to transfer instructions, then system complexity is reduced, but communication reliability and error correction capability worsen
Solution Approach 1:
The patent implements error detection and correction mechanisms by embedding control signals within the video transmission framework. The system uses the VBI period to transmit control data with built-in error checking capabilities, allowing the receiver to detect and correct transmission errors without requiring separate feedback channels, thus maintaining reliability while using a single cable.
3Reliability
If protocol signals are transmitted through video signal, then security is improved, but signal interference and detection difficulty worsen
Solution Approach 1:
The patent uses the vertical blanking interval (VBI) of the video signal as an intermediary carrier for control signals. The VBI is a standard part of analog video signals that occurs between vertical scan lines, providing a natural hiding place for control data. This intermediary approach allows control signals to be transmitted securely within the video stream while maintaining detectability through standard video signal processing methods.
Data Source
AI summary
A method and apparatus for exchanging a protocol is provided. A protocol may be indicated in a preset section of a vertical blanking interval (VBI) of an analog video and thereby transmitted. A protocol transmission apparatus may transmit an analog video signal in which a protocol signal is indicated to a protocol reception apparatus. The protocol reception apparatus may detect a protocol by receiving the analog video signal from the protocol transmission apparatus.