Synchronous Control Device for Video-Audio Output Timing
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Solution Overview
Problem
In remote video monitoring systems, it is challenging to maintain synchronous output of video/audio data across multiple display devices due to internal clock discrepancies, leading to shifts in presentation timing and potential desynchronization over time.
Innovation Solution
A synchronous control device and method that acquires frame data chronologically, adjusts output timing by inserting or deleting frames based on predetermined instructions, and compares output time points with reference times to maintain synchronization, using a frame data acquisition unit, data adjustment unit, and data output time-point adjustment unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple output devices operate with respective internal clocks, then each device can independently process video/audio data, but synchronous output across multiple devices cannot be ensured
Solution Approach 1:
The patent merges the clock operations of multiple output devices by introducing a master clock that provides a common time reference to all devices. This allows each device to operate independently while maintaining synchronized output through the shared clock signal, resolving the contradiction between independent operation and synchronous output.
Solution Approach 2:
The patent introduces a clock synchronization unit as an intermediary between the master clock and individual output devices. This mediator distributes the master clock signal to each device, ensuring they all operate from the same time reference while maintaining their independent processing capabilities.
2Reliability
If frame data is inserted or deleted to adjust output timing, then synchronous output can be corrected, but data loss or duplication occurs
Solution Approach 1:
The patent changes the timing parameters of frame data output by adjusting the output timing based on clock synchronization status. Instead of inserting or deleting frames, the system modifies when frames are output relative to the master clock, achieving synchronization without data loss or duplication.
Solution Approach 2:
The patent implements dynamic timing adjustment where the output timing of frame data is continuously adapted based on the synchronization status with the master clock. This dynamic approach allows the system to maintain synchronization while preserving all original frame data, avoiding the need for static insertion or deletion operations.
Data Source
AI summary
A synchronous shift of video/audio data between a plurality of display system devices is suppressed. A synchronous control device includes a coded-data adjustment unit 312 or a video and audio data adjustment unit 314 configured to perform frame adjustment based on a predetermined frame adjustment instruction by inserting predetermined frame data into a plurality of pieces of frame data in a chronological order or deleting a piece of frame data from the plurality of pieces of frame data, a video and audio data output unit 315 configured to sequentially output each piece of frame data subjected to the frame adjustment, and a video and audio data output time-point adjustment unit 316 configured to compare a reference time point for outputting each piece of the frame data with an output time point at which each piece of the frame data is output. In the synchronous control device, the video and audio data output time-point adjustment unit 316 issues the frame adjustment instruction to insert predetermined frame data if the output time point precedes the reference time point by a threshold value or longer, and alternatively issues the frame adjustment instruction to delete a piece of frame data if the output time point is delayed from the reference time point by a threshold value or longer.