Headset Arrangement with Opposing Sound Sources for Frontal Localization
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Solution Overview
Problem
Current VR and AR headsets fail to accurately reproduce acoustic events from the frontal direction due to limitations in sound localization, particularly when using conventional headphones, which often result in front-back confusion and incorrect positioning of virtual sound sources, and integrated loudspeakers in headsets degrade spatial sound aspects and low-frequency output.
Innovation Solution
A headset arrangement with a support structure that encircles the ear partially, featuring at least two sound sources positioned to create natural directional pinna cues by opposing sound incidence directions and minimizing reflections, allowing for improved sound source localization and spatial audio reproduction without the need for individual transfer function compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional headphones are used for sound reproduction in VR/AR headsets, then general sound quality is maintained, but accurate sound source localization in the frontal direction cannot be achieved and front-back confusion occurs
Solution Approach 1:
The patent divides the sound reproduction system into multiple independent sound sources positioned at different locations around the user's head. Instead of using a single stereo channel or conventional headphone setup, the system segments the audio output into multiple spatially distributed transducers that can independently control sound pressure at different ear locations, enabling accurate frontal sound source localization.
Solution Approach 2:
The patent transitions from conventional 2D stereo sound reproduction to 3D spatial sound reproduction by adding the vertical dimension and surrounding the user's head with multiple sound sources. This dimensional expansion allows sound to be reproduced from all directions including directly in front of the user, resolving the front-back confusion problem inherent in planar stereo systems.
2Ease of operation
If integrated loudspeakers are incorporated into VR/AR headsets to eliminate the need for separate headphones, then device clutter is reduced and wearing comfort is improved, but spatial sound aspects and low-frequency output are degraded
Solution Approach 1:
The patent segments the integrated loudspeaker system into multiple small transducers distributed around the head, rather than using a single large speaker unit. This segmentation allows each transducer to be positioned optimally for spatial sound reproduction while maintaining a compact form factor that integrates comfortably with the VR/AR headset structure.
Solution Approach 2:
The patent applies local quality by positioning different sound sources at specific locations around the user's head tailored to their individual ear geometry and head-related transfer functions. Each sound source is optimized for its specific position and function, with some sources dedicated to frontal reproduction, others to surround sound, and low-frequency sources positioned to maximize bass output while minimizing distortion.
3Measurement precision
If individual transfer function compensation is implemented to improve sound localization accuracy, then frontal sound source positioning is enhanced, but measurement procedures and measurement hardware are required increasing device complexity
Solution Approach 1:
The patent implements self-service by designing the sound source arrangement to automatically adapt to individual user anatomy without requiring external measurement equipment. The system uses the user's own head and ear structure as the reference framework, with sound sources positioned relative to anatomical landmarks that naturally provide the necessary transfer function compensation.
Solution Approach 2:
The patent creates a physical copy of the ideal sound field distribution by strategically positioning multiple sound sources to replicate natural sound incidence from different directions. Rather than using complex digital signal processing to compensate for individual variations, the physical arrangement of sound sources directly reproduces the desired spatial sound patterns that work effectively for most users.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the accuracy of sound source localization, particularly in the frontal direction, while maintaining general sound quality and reducing unwanted pressure and heat, providing a more immersive audio experience for VR and AR applications.
Implementation Method 1
at the concha of the user a primary sound incidence direction of sound emitted by the first sound source is essentially opposing to a primary sound incidence direction of sound emitted by the second sound source
Data Source
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Figure 4A~5
Figure 6~8C
AI summary
A headset arrangement for virtual reality, augmented reality or mixed reality applications is configured to induce natural directional pinna cues. The arrangement comprises a support structure configured to be arranged on a user's head and to hold a display in front of the user's eyes. For each ear, the support structure comprises at least a first sound source and a second sound source, wherein, when the support structure is arranged on a user's head, the first sound source and the second sound source are arranged such that at the concha of the user a primary sound incidence direction of sound emitted by the first sound source is essentially opposing to a primary sound incidence direction of sound emitted by the second sound source. The primary sound incidence direction is the direction from which the sound emitted by a sound source reaches the concha for the first time.