Video Signal Switching Apparatus Reducing Processing Delays
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Solution Overview
Problem
Conventional video matrix switches face high cost and complexity due to the need for multiple physical and video processor chips, leading to long switching times as each video signal must wait for processing by both types of chips during switching operations.
Innovation Solution
A video signal switching apparatus where the video signal processor is positioned downstream, allowing for simultaneous processing of the next scheduled video signal in the background while the current signal is processed, reducing the need for multiple processors and shortening switching delays by pre-converting signals for immediate output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple physical layer processor chips and video processor chips are used in conventional video matrix switches, then the system can achieve cycled switching or collage display, but the cost and complexity of the video matrix switch increases
Solution Approach 1:
The patent merges the physical layer processing and video processing functions into a single integrated video processor. The video processor receives video signals from multiple input ports, performs both physical layer processing and video processing, and outputs to the display screen. This consolidation reduces the number of separate chips from multiple physical layer processors plus multiple video processors to a single integrated processor per output channel, thereby reducing system complexity and cost while maintaining the ability to achieve cycled switching or collage display.
2Device complexity
If the video processor chip is positioned before the video switch in conventional architecture, then each physical layer processor can be coupled to a corresponding video processor chip, but the switching time becomes long because each video signal must wait for processing by both types of chips
Solution Approach 1:
The patent positions the video processor downstream of the video switch, allowing the switch to immediately route incoming video signals to the processor without waiting for prior processing. The video processor then performs all necessary processing (physical layer and video processing) in sequence. This arrangement eliminates the need for signals to wait for processing by multiple chips before switching, as the switching decision can be made immediately upon signal arrival, significantly reducing switching time while maintaining a simplified component layout.
Data Source
AI summary
A video signal switching apparatus includes a signal selection device which selectively outputs received multiple video signals to its first and second output ports; and a signal switching device, which includes first and second signal conversion devices coupled to the first and second output ports, and a switch which selectively couples the first or second signal conversion device to a switch output. The first signal conversion device receives a first video signal having a first format from the first output port and converts it to a first converted video signal having a second format. While the switch selectively couples the first converted video signal from the first signal conversion device to the switching output, the second signal conversion device receives a second video signal having a first format from the second output port and converts it to a second converted video signal having the second signal format.