Video Signal Transmission with Composite Sync Merging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional KVM extenders face inefficiencies in transmitting video signals with composite sync signals, as they require decoding and recombination of horizontal and vertical sync signals with color signals, leading to complex signal processing and limited wire utilization.
Innovation Solution
A method and apparatus that detect whether horizontal and vertical sync signals are independent or composite, generating a composite sync signal based on timing characteristics for efficient transmission, using a signal detector, multiplexer, and transmitter to combine or pass sync signals accordingly, optimizing signal processing and wire usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dongle device combines horizontal sync signal and vertical sync signal with color signals separately, then the video signal can be transmitted through the cable, but the signal processing complexity increases
Solution Approach 1:
The patent combines both horizontal sync signal and vertical sync signal into a single composite sync signal that is then mixed with one color signal (typically blue) for transmission through the cable. This merging approach reduces the number of separate signal combinations needed and simplifies the overall transmission architecture.
Solution Approach 2:
The composite sync signal serves multiple functions: it carries both horizontal and vertical synchronization information simultaneously, and when combined with a color signal, it enables both sync transmission and color signal transmission through the same cable pair, making the system more versatile and efficient.
2Adaptability or versatility
If the dongle device decodes composite sync signal into horizontal and vertical sync signals, then it can work with computers providing composite sync, but the processing steps increase
Solution Approach 1:
The system dynamically adapts its operation mode based on the input signal type. When a composite sync signal is detected, the dongle device performs decoding to extract horizontal and vertical sync signals. When independent sync signals are detected, it directly combines them with color signals. This dynamic behavior provides versatility while optimizing processing steps for each scenario.
Solution Approach 2:
The system changes its processing parameters based on the input signal characteristics. The signal detector identifies whether the input contains composite or independent sync signals, and the multiplexer adjusts its operation accordingly - either decoding the composite signal or directly combining independent signals with color signals, thereby adapting to different computer configurations.
3Reliability
If four pairs of wires are used for video signal transmission, then all signals can be transmitted separately, but wire utilization efficiency decreases
Solution Approach 1:
The patent merges the transmission of horizontal sync signal, vertical sync signal, and a color signal (e.g., blue) into a single composite combination that is transmitted through one cable pair. This combining approach allows multiple signals to share the same transmission medium, improving wire utilization efficiency while maintaining reliable signal transmission.
Data Source
AI summary
An apparatus for transmitting a video signal includes a signal detector, a multiplexer and a transmitter. The signal detector detects the video signal from the source to determine whether the horizontal sync signal and the vertical sync signal of the video signal are independent or composite. The multiplexer generates a composite sync signal by combining the horizontal sync signal and the vertical sync signal with reference to timing characteristics of the horizontal sync signal and the vertical sync signal while the horizontal sync signal and the vertical sync signal are detected as independent signals, and passes the composite sync signal while the horizontal sync signal and the vertical sync signal are detected as the composite sync signal. The transmitter transmits the video signal with the composite sync signal to the destination via a media. A method for transmitting the video signal is also disclosed.