Audio Video Signal Synchronization via Correlation Analysis
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Solution Overview
Problem
Audio and video signals often become out of sync due to different communication paths in entertainment and communication systems, leading to lip sync errors that existing technologies fail to effectively address.
Innovation Solution
A method involving tagging audio and video signals with correlation signals, analyzing these signals to determine synchronization errors, and generating a synchronization signal to correct phase differences, ensuring accurate synchronization through a network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If audio and video signals are transmitted through different communication paths, then transmission flexibility and adaptability are improved, but synchronization accuracy deteriorates due to lip sync errors
Solution Approach 1:
The patent applies preliminary action by inserting synchronization markers and correlation signals into the audio and video streams before transmission. These markers serve as reference points that enable later synchronization analysis and correction, allowing the system to anticipate and compensate for potential desynchronization issues that may arise during transmission through different communication paths.
Solution Approach 2:
The patent implements feedback mechanisms by analyzing the correlation between audio and video signals after transmission and using this analysis to generate correction signals. The synchronization error is detected through correlation analysis, and feedback correction signals are generated to adjust the timing of audio or video signals, thereby maintaining synchronization accuracy despite the flexibility of different transmission paths.
2Measurement precision
If correlation signals are added to audio and video signals for synchronization analysis, then synchronization precision is improved, but signal complexity increases
Solution Approach 1:
The patent applies local quality by adding correlation signals only at specific locations within the audio and video streams rather than modifying the entire signal continuously. The synchronization markers are inserted at predetermined intervals, creating localized reference points that enable synchronization analysis without requiring complex modifications to the overall signal structure, thus balancing precision improvement with complexity control.
Solution Approach 2:
The patent uses correlation signals as intermediary elements that facilitate synchronization analysis without becoming the primary content of the transmission. These correlation signals act as mediators between the audio and video streams, providing reference information for correlation analysis while maintaining the integrity and simplicity of the original audio and video content.
3Speed
If synchronization markers are inserted at high frequency, then synchronization response time is improved, but processing load increases
Solution Approach 1:
The patent applies partial action by inserting synchronization markers at optimized intervals that provide sufficient synchronization information without excessive frequency. The marker insertion frequency is carefully controlled to achieve adequate synchronization response while avoiding unnecessary processing load. This balanced approach ensures that the markers provide sufficient reference points for correlation analysis without creating excessive processing requirements.
Data Source
AI summary
Systems and method for synchronizing audio and video signals are described. The audio and video signals are tagged in an encoder. The tagged signals are transmitted across a network. The tagged signals are analyzed to detect phase errors or lip synch errors between them. A synchronization signal is generated in response to such lip synch errors.