HDMI Repeater Lip-Sync Correction via EDID Latency
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Solution Overview
Problem
Conventional systems fail to correct lip-sync deviations between video and audio signals when they have separate transmission paths, as they can only recognize one time stamp at a time, preventing accurate synchronization.
Innovation Solution
A repeater is introduced between the source and sink devices to process both video and audio signals using HDMI transmission, calculating and applying a delay difference to correct lip-sync by acquiring and transmitting total latency information through EDID, ensuring synchronized reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate transmission paths are used for video and audio signals, then transmission flexibility is improved, but lip-sync correction capability deteriorates because only one time stamp can be recognized at a time
Solution Approach 1:
The patent introduces an intermediary device (repeater or audio processing device) that receives both video and audio signals, extracts time stamps from both paths, compares them, and applies delay correction. This intermediary acts as a mediator that bridges the separate transmission paths, enabling lip-sync correction without requiring the paths to be physically combined.
2Loss of information
If time stamps are multiplexed on both video and audio signals in separate paths, then synchronization information is improved, but data transmission requirements increase
Solution Approach 1:
The patent extracts only the essential time stamp information from the multiplexed data streams and transmits this extracted synchronization information separately. By taking out only the critical timing data rather than transmitting entire multiplexed streams, the system maintains synchronization capability while reducing overall data transmission requirements.
Data Source
AI summary
A repeater is to be provided between a source device and a sink device and be used in a Lip-sync correction system that transmits a video signal and an audio signal from the source device to the sink device through a HDMI (High Definition Multimedia Interface) transmission path and reproduces the video signal and the audio signal in synchronous with them on the sink device. A communication from the source device to the sink device is defined as a downstream communication, and a communication from the sink device to the source device is defined as a upstream communication. The repeater includes a processor that receives the video signal and the audio signal through the upstream communication and the downstream communication and processes the received video signal and the received audio signal. The processor corrects deviation between the video signal and the audio signal.