Cleanup Switch for Asynchronous Video Signal Buffering
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Solution Overview
Problem
Professional video environments face challenges in switching live, real-time video streams over IP networks with minimal latency without picture disruption, as current Ethernet switches do not effectively handle video frame boundaries and non-aligned video streams.
Innovation Solution
An asynchronous video signal switching method involving SDI to IP converters, an Ethernet/IP switch, and a cleanup switch that buffers and replays signals to mitigate disruptions, allowing seamless switching between video sources by initially forwarding signals from one source, buffering, and then switching to the second source upon detection of a video frame boundary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Ethernet switches are used to switch packetized video signals, then IP network compatibility is improved, but video frame boundary alignment and picture continuity deteriorate
Solution Approach 1:
The patent introduces a cleanup switch as an intermediary device between the Ethernet/IP switch and the video output. This cleanup switch specifically handles video frame boundary alignment and ensures picture continuity, while the Ethernet switch handles general IP network switching. The intermediary resolves the conflict by separating the general-purpose IP switching function from the specialized video frame synchronization function.
2Speed
If video signals are switched without buffering, then switching speed is improved, but picture disruption increases
Solution Approach 1:
The cleanup switch performs preliminary actions by pre-buffering video data and detecting frame boundaries in advance. When a switch is needed, the system has already prepared the next frame data in the buffer, allowing for seamless switching without picture disruption. This preliminary preparation resolves the contradiction by maintaining both fast switching and continuous picture output.
3Reliability
If buffering is used to prevent picture disruption, then picture continuity is improved, but latency increases
Solution Approach 1:
The cleanup switch uses partial buffering - only buffering enough data to ensure frame boundary alignment and prevent picture disruption, rather than buffering entire video streams. This selective, partial buffering approach maintains picture continuity while minimizing the time delay, thus resolving the contradiction between reliability and latency.
Data Source
AI summary
An asynchronous switching system and method for processing data streams, the system and method utilizing one or more buffers for cleaning up an output of a dirty switch.