HMD Audio Mode Switching for Latency Reduction
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Solution Overview
Problem
Existing head-mounted display systems face challenges in providing a realistic virtual or augmented reality experience due to high audio signal latency, which disrupts the synchronization of visual and auditory feedback during user interactions.
Innovation Solution
A system that automatically adjusts audio modes based on the physical relationship between the head-mounted display mount and the mobile device, reducing audio signal latency by changing buffer sizes and digital audio codecs, and adjusting sound rendering and microphone directions to enhance motion-to-sound latency and realism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the system uses standard audio buffering and processing modes, then audio signal stability is maintained, but audio signal latency increases
Solution Approach 1:
The system dynamically adjusts audio processing parameters based on the detected physical state. When the mobile device is mounted on the HMD mount, the system automatically switches from a first audio mode with higher latency to a second audio mode with lower latency, making the audio processing adaptive rather than static
Solution Approach 2:
The system changes specific audio processing parameters including buffer size and digital audio codec selection based on the mounting state. By reducing buffer size and selecting appropriate codecs when mounted, the system reduces audio signal latency while maintaining stability through controlled parameter transitions
2Loss of time
If the system reduces buffer size to lower latency, then audio signal latency decreases, but audio signal stability may be compromised
Solution Approach 1:
The system employs dynamic buffer size adjustment based on mounting detection. The buffer size is reduced only when the mobile device is securely mounted on the HMD mount, where mechanical stability provides a stable reference frame. This conditional dynamic adjustment allows lower latency without compromising stability during movement
Solution Approach 2:
The system uses feedback from motion sensors and mounting detection mechanisms to continuously monitor the physical state. This feedback loop allows the system to adapt buffer sizes in real-time, reducing latency when stable (mounted) and increasing buffer sizes when movement is detected, thus maintaining audio signal stability
3Adaptability or versatility
If the system uses default sound rendering directions, then compatibility is maintained, but immersion and realism are reduced
Solution Approach 1:
The system applies different sound rendering quality based on the mounting state. When mounted on the HMD, the system activates enhanced spatial audio processing that renders sounds in directions corresponding to the user's head orientation, providing localized high-quality spatial audio experience rather than uniform default rendering
Solution Approach 2:
The system implements asymmetric sound rendering where the audio output is dynamically adjusted based on the asymmetric orientation of the user's head and the mounting configuration. This allows sounds to be rendered in directionally accurate positions relative to the user's perspective, enhancing spatial realism
4Loss of time
If the system automatically detects mounting state and switches audio modes, then audio synchronization is improved, but system complexity increases
Solution Approach 1:
The system performs self-service by automatically detecting the mounting state through sensors and autonomously switching between audio modes without user intervention. The mounting detection mechanism and audio mode management are integrated into the system, allowing it to self-adjust audio processing parameters based on its own physical state
Solution Approach 2:
The system integrates multiple functions into a unified mounting detection and audio mode management mechanism. The same sensor system used for motion tracking also detects mounting state, and the audio processing system handles both standard and spatial audio rendering, reducing overall system complexity through functional integration
Data Source
AI summary
A system having a head-mounted display (HMD) mount and a mobile device, are described. A processor of the system can determine whether the mobile device is mounted on the HMD mount and handle an audio signal communicated from the mobile device to a wireless headphone based on whether the mobile device is mounted on the HMD mount. When the mobile device is not mounted on the HMD mount, the mobile device or the wireless headphone may operate in a first audio mode. When the mobile device is mounted on the HMD mount, the mobile device or the wireless headphone may operate in a second audio mode. The second audio mode can reduce audio signal latency between the mobile device and the wireless headphone and increase motion-to-sound quality. Other embodiments are also described and claimed.