Audio-Video Sync Feedback Circuit for Lip-Sync Delay Control
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Solution Overview
Problem
Existing audio/video systems face synchronization challenges due to processing delays in video signal transmission, leading to lip-sync issues between audio and video outputs, which are not effectively addressed by current technologies.
Innovation Solution
An electronic device with a processor connected to both audio and display components, utilizing feedback circuitry with an XOR gate to identify and adjust the timing differences between audio and video signals, ensuring synchronization by controlling output timing based on detected delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If video processing (e.g., MPEG decoding) is applied to improve video quality, then video signal processing capability is improved, but processing delays increase causing synchronization issues with audio
Solution Approach 1:
The patent implements a feedback mechanism where the processor receives feedback signals from both the video processing path (after MPEG decoding) and the audio processing path (after audio processing). By comparing the timing of these feedback signals, the system automatically detects synchronization delays and adjusts the audio output timing to compensate for video processing delays, thereby resolving the contradiction between video processing quality and synchronization timing.
2Measurement precision
If automatic synchronization control is implemented to reduce lip-sync issues, then synchronization accuracy is improved, but device complexity increases due to additional feedback circuitry
Solution Approach 1:
The patent introduces a feedback circuit as an intermediary component that simplifies the synchronization control process. The feedback circuit receives timing signals from both video and audio processing paths, automatically compares their timing, and generates compensation signals. This intermediary mechanism achieves precise automatic synchronization without requiring complex software algorithms or manual intervention, thereby improving synchronization accuracy while keeping the overall system complexity manageable.
Data Source
AI summary
An electronic device and a control method for synchronizing audio and video outputs are disclosed. The electronic device includes: at least one memory, at least one display component including display circuitry, at least one audio component including audio circuitry, and at least one processor electrically connected to at least some of the memory, the display component, and the audio component. The processor is electrically connected to a feedback circuitry and configured to transmit a first signal related to video and a second signal related to audio to the feedback circuitry. The processor is configured to obtain, based on a feedback signal received from the feedback circuitry, a time difference in between a first time point at which a voltage level of the first signal is switched, and a second time point at which a voltage level of the second signal is switched. The processor is configured to control an output timing of the audio or the video based on the time difference.