Video Wall Synchronization via Pre-Switch Command
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Solution Overview
Problem
Conventional video wall systems experience unstable displays and signal interruptions during video stream switching due to asynchronous switching events among multiple video switches, affecting the viewing experience.
Innovation Solution
A synchronized switching method for video streams, where a transmitter uses separate channels to transmit a pre-switch command and the video stream, allowing receivers to preserve the current stream for a predetermined time before switching to the new stream, ensuring all receivers switch simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional video switches are used for video stream switching, then the switching operation is simple, but the switching time is not synchronized causing unstable display
Solution Approach 1:
The transmitter sends a pre-switch command to the receiver before the actual video stream switching occurs. This preliminary action allows the receiver to prepare for the switch in advance, ensuring that both transmitter and receiver are synchronized when the switching event happens, thereby preventing display instability without requiring complex switching control mechanisms.
2Reliability
If the receiver switches immediately upon receiving the new video stream, then the switching speed is fast, but the display becomes unstable due to asynchrony
Solution Approach 1:
The receiver receives and processes the pre-switch command in advance, preparing its internal state before the actual switching event. This preliminary preparation ensures that when the new video stream arrives, the receiver is already synchronized and ready to switch without causing display instability, thus maintaining both reliability and switching speed.
Solution Approach 2:
The pre-switch command acts as an intermediary signal between the transmitter and receiver. It carries switching information in advance, allowing the receiver to coordinate its switching action with the transmitter without requiring immediate reaction to the video stream change, thereby maintaining synchronization and display stability.
3Reliability
If multiple receivers switch independently, then each receiver operates autonomously, but the displays are not synchronized across the video wall
Solution Approach 1:
The pre-switch command is transmitted to multiple receivers simultaneously through the same communication channel. Each receiver independently processes this universal command and performs switching at the same predetermined time, achieving synchronized display across the entire video wall without requiring complex coordinated control operations.
Data Source
AI summary
A synchronized video stream switching method for a video wall system. The video wall system includes a transmitter having first and second channels, and a receiver having third and fourth channels. The method includes: (a) After receiving a control command, the transmitter uses the first channel to transmit the first video stream to the third channel, and uses the second channel to transmit a pre-switch command to the fourth channel. (b) After receiving the pre-switch command, the receiver preserves the first video stream in the third channel. (c) After the switching event occurs at the transmitter in response to the control command, the transmitter transmit the second video stream via the first channel, but the receiver continues to preserve the first video stream in the third channel within a predetermined time period. (d) After the predetermined time period, the receiver accepts the second video stream in the third channel.