VR Viewing System Synchronization via External Master Management
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Solution Overview
Problem
In virtual reality viewing systems where a head-mounted display (HMD) reproduces main contents and an external computer reproduces sub-contents, there is a time difference between the moving image and the external sound, leading to synchronization issues, especially when multiple users are involved.
Innovation Solution
Implementing a master management system to synchronize the reproduction elapsed time of the moving image with the sub-contents, using a reference reproduction elapsed time managed by the external computer, and adjusting the moving image reproduction to eliminate any detected differences, ensuring synchronized playback of both main and sub-contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sound is reproduced by an external computer and output from an external speaker, then the VR viewing system can be constructed with separate audio processing, but there is a time difference between the moving image reproduced by the HMD and the external sound reproduced by the external computer
Solution Approach 1:
The external computer detects the reproduction elapsed time of the moving image from each HMD and compares it with the reference reproduction elapsed time. Based on this feedback, the external computer generates adjustment instructions to eliminate the time difference between the moving image and sound reproduction, thereby maintaining synchronization accuracy while using separate audio processing
Solution Approach 2:
The external computer acts as an intermediary that manages the reference reproduction elapsed time and coordinates between multiple HMDs and the external speaker. By controlling the sound reproduction based on the reference time and adjusting individual HMD playback times, the external computer mediates the synchronization between visual and audio content across the distributed system
2Adaptability or versatility
If the same moving image is reproduced on each HMD mounted by a plurality of users, then multiple users can experience the VR content simultaneously, but there may be a difference in a reproduction time of the moving image between the HMDs
Solution Approach 1:
The external computer establishes a reference reproduction elapsed time that serves as a common time基准 for all HMDs. By adjusting each HMD's moving image reproduction to match this reference time, the system creates equipotentiality in reproduction timing across all users, ensuring that despite independent reproduction, all HMDs stay synchronized with the external sound and each other
Data Source
AI summary
This VR viewing system is configured such that an external computer 200 outputs sound from an external speaker 300 while an HMD 100 reproduces a VR moving image by means of a built-in computer. The external computer 200 performs a sound output to the external speaker 300, conducts a master management of a reproduction elapsed time of the VR moving image so as to be synchronized with the sound output, detects a difference between the reproduction elapsed time of the VR moving image by the built-in computer of the HMD 100 and the reproduction elapsed time of the VR moving image undergoing the master management by the external computer 200, and adjusts the reproduction of the VR moving image by the built-in computer so as to eliminate the detected difference.