On-Ear Headphone Loudspeaker Assembly for 3D Sound Localization
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Solution Overview
Problem
Conventional stereo headphones fail to effectively localize sound events in space, particularly in virtual and augmented reality applications, due to limitations in generating three-dimensional sound experiences.
Innovation Solution
A loudspeaker assembly for on-ear headphones incorporating a woofer for low frequency sound waves and a MEMS tweeter for high frequency sound waves, with carefully oriented sound beam axes and a control unit for stereoscopic sound mode, allowing precise localization of sound sources in three dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional stereo headphones are used, then the basic audio function is provided, but the spatial localization of sound events cannot be achieved
Solution Approach 1:
The headphone is divided into functionally independent left and right headphone units, each containing its own loudspeaker assembly with woofer and tweeter. This segmentation allows each ear to receive independently optimized sound signals for spatial localization, resolving the contradiction by enabling 3D sound localization through distributed acoustic sources rather than requiring a complex centralized system
Solution Approach 2:
The patent transitions from conventional 2D stereo sound to 3D spatial audio by adding vertical dimension through tweeters positioned above the ear canal. The tweeters emit high-frequency sound waves from above, creating elevation cues that enable the human ear to localize sound events in three-dimensional space, thus resolving the spatial localization limitation without excessive complexity
2Adaptability or versatility
If a single sound transducer is used in the headphone, then the device complexity is reduced, but the ability to generate three-dimensional sound experience is limited
Solution Approach 1:
The loudspeaker assembly merges a woofer and tweeter into a single integrated unit housing that is assigned to each ear. The woofer and tweeter work together to reproduce full-frequency sound signals with spatial localization capability, combining low-frequency omnidirectional sound with high-frequency directional cues to create 3D audio experiences without requiring multiple separate headphone units
Solution Approach 2:
Each loudspeaker assembly serves multiple functions: the woofer provides low-frequency bass reproduction and spatial anchoring, while the tweeter provides high-frequency localization cues and elevation information. This multi-functionality allows a single headphone unit to deliver both conventional audio playback and advanced spatial audio localization, resolving the contradiction between versatility and complexity
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
Enables realistic three-dimensional sound localization and spatial audio experiences by combining low frequency sound waves from a woofer with high frequency sound waves from a MEMS tweeter, enhancing immersion in virtual and augmented reality environments.
Implementation Method 1
A woofer is arranged in the housing, with the aid of which low frequency sound waves can be emitted along a low frequency sound beam axis toward the ear
Implementation Method 2
at least one tweeter is arranged in the housing, with the aid of which high frequency sound waves can be emitted along a high frequency sound beam axis
Implementation Method 3
The human ear can localize natural sounds and/or sound events, such as a chirping of birds, in space, for example, on the basis of a difference of the propagation time of the sound waves to the two ears
Implementation Method 4
Phase differences between the sound waves with respect to the two ears can also play a role in this case
Data Source
AI summary
A loudspeaker assembly for on-ear headphones, to be arranged on and/or over the ear, includes a housing in which a woofer is arranged and configured to emit low frequency sound waves along a low frequency sound beam axis toward the wearer's the ear. At least one tweeter is arranged in the housing and configured to emit high frequency sound waves along a high frequency sound beam axis toward the wearer's the ear. The at least one tweeter is a MEMS loudspeaker.