AV Device Audio Video Synchronization via Feedback Delay Compensation
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Solution Overview
Problem
Existing audio/video (AV) devices face challenges in synchronizing video and audio signals accurately and reliably, as the processing delays in AV devices and display devices can vary depending on content types, resolution, and device characteristics, leading to subjective and inconsistent compensation methods.
Innovation Solution
An AV device with a controller that determines processing delays by comparing a feedback signal from the display device to the original audio signal, allowing for precise timing adjustments to synchronize audio and video outputs, using a first signal transmitter, first signal receiver, and second signal transmitter to compensate for delays based on determined processing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual delay compensation is applied by the user, then the image and sound can be synchronized based on user determination, but the accuracy and reliability of compensation cannot be guaranteed and the compensation is invariable to varying delays
Solution Approach 1:
The patent implements an automatic feedback mechanism where the AV device transmits test audio signals to the display device, receives feedback signals containing processing delay information, and automatically adjusts audio output timing based on measured delays. This eliminates manual user adjustment and provides accurate, reliable synchronization that adapts to varying processing delays.
Solution Approach 2:
The system performs self-measurement and self-adjustment of synchronization delays without requiring user intervention. The AV device autonomously transmits test signals, measures the processing delay through feedback reception, and automatically compensates for the delay by adjusting audio output timing, making the system self-sufficient for synchronization.
2Adaptability or versatility
If fixed compensation values are used, then the device complexity is reduced, but the system cannot adapt to delays varied depending on content types, resolution, and device characteristics
Solution Approach 1:
The patent implements dynamic delay compensation where the system automatically measures processing delays and adjusts audio timing in real-time based on actual conditions. The compensation values are not fixed but dynamically adapted to match varying processing delays caused by different content types, resolutions, and device characteristics, providing versatility without requiring complex manual configuration.
Solution Approach 2:
The system changes the audio output timing parameter dynamically based on measured processing delays. By automatically adjusting the audio delay parameter according to actual processing conditions rather than using fixed values, the system adapts to varying requirements while keeping the control mechanism relatively simple through automated measurement and adjustment.
Data Source
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AI summary
An AV device (11) including a first signal transmitter (22) configured to output a video signal and a first audio signal corresponding to the video signal to a display device (12); a first signal receiver (24) configured to receive a feedback signal of the first audio signal from the display device; a second signal transmitter (23) configured to output a second audio signal corresponding to the video signal; and a controller configured to determine a processing delay time of the display device by comparing the first audio signal and the feedback signal, and control the second signal transmitter to delay the output of the second audio signal based on the determined processing delay time.