Bone-Conductive Audio System Spatial Localization
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Solution Overview
Problem
Conventional hearing aids, including in-ear and behind-the-ear devices, compromise the natural ability to localize sound sources in three-dimensional space due to blockage of the ear canal and disruption of the outer ear's acoustic filtering process, leading to difficulties in noisy environments and safety concerns.
Innovation Solution
A bone-conductive audio system with microphones placed strategically around the head, including one in front and one behind the outer ear, interacting with amplified vibration transducers to recreate spatial audio cues through the temporal bone, bypassing the traditional acoustic pathway and stimulating the nervous system for improved sound localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional hearing aids block the ear canal to amplify sound, then hearing amplification is improved, but the ability to localize sound sources in three-dimensional space deteriorates
Solution Approach 1:
The patent uses bone conduction as an intermediary pathway to transmit audio signals bypassing the blocked ear canal. The bone-conductive transducer converts audio signals into mechanical vibrations that travel through the skull bones directly to the inner ear, allowing sound amplification without blocking the external ear canal and preserving natural sound localization cues
Solution Approach 2:
The patent replaces the traditional acoustic mechanical system (sound waves traveling through air to the eardrum) with a direct mechanical vibration system. By placing a bone-conductive transducer on the skull, the system directly mechanically stimulates the bone structure to transmit vibrations to the inner ear, bypassing the need for acoustic wave transmission through the ear canal
2Ease of operation
If microphones are placed behind the outer ear to capture sound, then device placement is simplified, but sound capture quality deteriorates due to the outer ear acting as a barrier
Solution Approach 1:
The patent transitions from two-dimensional sound capture (microphones on the surface behind the ear) to three-dimensional sound capture by embedding microphones within a head-shaped structure that surrounds the ear. This volumetric arrangement allows microphones to capture sound from multiple directions simultaneously, overcoming the barrier effect of the outer ear while maintaining natural spatial audio information
3Power
If the ear canal is blocked by hearing aid devices, then sound amplification is achieved, but natural acoustic filtering by the outer ear is disrupted
Solution Approach 1:
The patent extracts the audio signal capture function from the ear canal blocking device and relocates it to microphones positioned on the outer surface of a head-shaped structure. This separation allows the ear canal to remain open and functional while the microphones capture the acoustically filtered sound waves that naturally reach the outer ear, preserving the original acoustic information
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
Enhances the ability to locate sound sources in three-dimensional space, providing improved directional hearing and safety in noisy environments by leveraging the body's natural sensory abilities, particularly for individuals with hearing impairments.
Implementation Method 1
a vibration transducer in communication with the at least one microphone and adapted to vibrate the temporal bone of the skull in accordance with the audio signal derived from the at least one microphone
Data Source
AI summary
A bone-conductive audio system includes at least one head-worn hearing enhancement apparatus. The head-worn hearing enhancement apparatus comprises a microphone in front of the outer ear generally picking up sound in a forward outward direction and at least one microphone behind the outer ear picking up sound in a more rearward outward direction. First and second amplified vibration transducers interact with the at least one microphone in front of the outer ear and the at least one microphone behind the outer ear. The first and second amplified vibration transducers are drawn toward audio conductive bones. Placement of the at least one microphone in front of the outer ear and the at least one microphone behind the outer ear feeds the naturally captured discrete audio signals, front and rear, captured in a physical location on the head to the first and second amplified vibration transducers to create organically recognizable audio spatiality.