Audio-Video Synchronization Using Dynamic Timestamp-Based Frame Timing
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Solution Overview
Problem
Existing video and audio processing devices synchronize data using a fixed delay time, which is inadequate for varying application scenarios where different signal processing introduces varying delays, leading to unsynchronized playback.
Innovation Solution
A video data and audio data synchronization device and method that dynamically adjusts the display timing of video frames based on timestamps, using a processor to synchronize audio and video data by adjusting the clock signal frequency according to write and read pointers and first and second clock signals, ensuring synchronized playback across different scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed delay time is introduced to synchronize video and audio data, then synchronization is achieved under specific conditions, but the system becomes inapplicable to different application scenarios with varying signal processing delays
Solution Approach 1:
The patent implements dynamic delay adjustment by replacing the fixed delay time with a variable delay parameter that is automatically calculated based on actual video and audio processing durations. The processor continuously monitors processing times and adjusts the delay parameter in real-time, enabling the system to adapt to different application scenarios while maintaining reliable synchronization through automated parameter optimization.
Solution Approach 2:
The system changes the synchronization parameter from a fixed delay time to a dynamically calculated delay parameter. The processor computes the appropriate delay value based on the actual processing durations of video and audio data, allowing the parameter to vary according to different processing scenarios. This parameter transformation enables both adaptability to diverse applications and reliable synchronization through data-driven optimization.
2Adaptability or versatility
If different signal processing operations are applied to video or audio data, then processing flexibility is improved, but the synchronization becomes unreliable due to varying delay times
Solution Approach 1:
The patent implements a feedback mechanism where the processor continuously monitors the actual processing durations of video and audio data and uses this information to adjust the delay parameter. This closed-loop control ensures that regardless of which signal processing operations are applied, the system automatically compensates for varying delays to maintain consistent synchronization across different processing scenarios.
3Device complexity
If a fixed delay time is used for synchronization, then the system structure remains simple, but it cannot accommodate varying processing delays in different scenarios
Solution Approach 1:
The patent enables the system to self-adjust the synchronization delay parameter automatically without requiring manual configuration for different scenarios. The processor independently monitors processing durations and calculates the appropriate delay value, allowing the system to adapt to various application scenarios while maintaining simple operational control. The complexity is confined to the automated calculation mechanism rather than user-facing complexity.
Data Source
AI summary
A device includes audio and video input circuits, a processor, an audio output circuit, and a video output circuit. The audio input circuit receives an audio input according to a first clock signal. The processor stores the audio input to a memory according to a write pointer, processes the video input received via the video input circuit to generate and store a video output to the memory, and processes the audio input to generate and store an audio output to the memory. The audio output circuit outputs sub-audio data in the audio output according to a read pointer and a second clock signal, and adjusts the second clock signal. The video output circuit reads frame data in the video output from the memory. The processor determines whether to control the video output circuit to stop outputting according to a timestamp difference between the frame data and the sub-audio data.