Video Stream Routing Unit with Audio Delay Synchronization
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Solution Overview
Problem
Existing digital video stream routing and format conversion systems face challenges in efficiently processing and synchronizing differently formatted video and audio streams, particularly in ensuring accurate audio delay to match video reformatting processes, leading to potential synchronization issues and suboptimal viewing experiences.
Innovation Solution
A digital video stream routing and format conversion unit with an integrated audio delay mechanism, utilizing a multi-state routing network and channel processing segments for video reformatting, coupled with an audio delay unit employing ring buffer memory for precise audio sample delay adjustment, ensuring synchronization across various video and audio formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video stream routing and format conversion is performed, then video format compatibility is improved, but audio-video synchronization deteriorates
Solution Approach 1:
The system performs preliminary measurement of video processing delay through calibration sequences, then uses this measured delay value to pre-adjust the audio delay buffer before actual video playback. This ensures audio-video synchronization is maintained from the start of playback without requiring real-time adjustment during playback.
Solution Approach 2:
The system implements feedback by measuring the actual video processing delay using calibration sequences and using this measured information to adjust the audio delay buffer. The control circuit continuously monitors and adjusts audio buffering based on the measured video processing characteristics to maintain synchronization.
2Reliability
If audio delay is increased to match video processing time, then audio-video synchronization is improved, but audio playback latency increases
Solution Approach 1:
The system dynamically changes the audio delay buffer parameter based on the measured video processing delay. Instead of using a fixed large delay, the system adjusts the audio buffering to match the actual video processing time, minimizing unnecessary delay while maintaining synchronization.
3Productivity
If real-time video processing is performed, then video processing speed is improved, but processing accuracy deteriorates
Solution Approach 1:
The system performs preliminary calibration using calibration sequences to measure video processing delay before actual playback. This preliminary measurement allows the system to understand the processing characteristics without requiring complex real-time adjustments during playback, maintaining both speed and accuracy.
Data Source
AI summary
An apparatus capable of establishing different video sample stream processing channels between a plurality of video sample stream inputs and a video sample stream output is described. The apparatus includes a multi-state routing network comprising wiring to route a video sample stream. The multi-state routing network comprises outputs that are coupled to the inputs of a plurality of video sample stream channel processing segments, where, each channel processing segment comprises at least one signal processing block. The multi-state routing network also comprises inputs that are coupled to the outputs of the video sample stream channel processing segments. The multi-state routing network also comprises the plurality of video sample stream inputs the video sample stream output.