VR Audio Video Synchronization via Feedback Timing Adjustment
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Solution Overview
Problem
In virtual reality systems, non-synchronization (audio drift) between audio and video data occurs due to differing delays in the audio and video transmission paths, causing distraction and dissatisfaction for the user.
Innovation Solution
A method that involves connecting a VR device to a host device, estimating time delay information in both transmission paths, and adjusting the timing of the audio or video signals based on feedback to synchronize them, using techniques such as embedding audio patterns in audio signals and timestamps in video signals for accurate synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If audio and video signals are transmitted through separate transmission paths, then the signals can be processed independently, but the processing time differences cause audio-video desynchronization
Solution Approach 1:
The patent implements a feedback mechanism where the VR device measures the actual processing time of audio and video signals through transmission paths and sends this timing information back to the host device. The host device then adjusts the transmission timing based on this feedback to achieve synchronization, resolving the contradiction between independent processing and synchronization reliability
Solution Approach 2:
The patent dynamically adjusts the transmission timing parameters of audio and video signals based on measured processing time differences. By changing the timing parameters adaptively, the system maintains synchronization while allowing independent signal processing through different paths
2Measurement precision
If timing adjustment is made to synchronize audio and video, then synchronization accuracy is improved, but system complexity increases due to feedback mechanisms
Solution Approach 1:
The VR device performs self-measurement of its own audio and video processing times and generates feedback information autonomously. This self-service approach reduces the need for complex external measurement systems while achieving precise synchronization through the generated feedback
Data Source
AI summary
A method for audio-video synchronization in a virtual reality (VR) system is provided. The VR system includes a VR device and a host device. The method includes the steps of: connecting the VR device to a host device via a data transmission interface; transmitting an audio signal and a video signal from the host device to the VR device; estimating time delay information in an audio transmission path and a video transmission path of the VR device; transmitting a feedback signal recording the time delay information from the VR device to the host device; and adjusting timing of the audio signal or the video signal transmitted from the host device to the VR device according to the feedback signal.