Hear-Through Ear-Plug Assembly for Preserving Spatial Cues
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Solution Overview
Problem
Conventional headsets suppress real-world sounds, isolating users from their environment and exposing them to potential dangers by blocking ambient noise.
Innovation Solution
An ear-plug assembly with acoustic sensors and speakers that detect and rebroadcast local sounds, preserving spatial cues and allowing users to hear through audio content while maintaining environmental awareness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional headphones are worn to provide audio content, then audio delivery is improved, but environmental awareness deteriorates due to suppression of real-world sounds
Solution Approach 1:
The audio system is segmented into multiple functional pathways: an acoustic sensor pathway that captures environmental sounds through apertures in the ear-plug assembly, and a speaker pathway that delivers audio content. These segmented pathways operate simultaneously, allowing environmental awareness and audio content delivery to coexist without mutual interference.
Solution Approach 2:
Acoustic sensors act as intermediaries between the external environment and the user's auditory system. These sensors capture environmental sounds and transmit them to audio processing circuitry, which then reconstructs and delivers the environmental audio to the user, bridging the gap between isolation and environmental awareness.
2Reliability
If the ear canal is sealed to improve audio quality, then sound isolation is improved, but spatial cue preservation deteriorates
Solution Approach 1:
The ear-plug assembly implements local quality by providing different acoustic characteristics at different locations: the speaker creates a controlled acoustic environment for audio content delivery, while apertures at the housing provide unobstructed pathways for environmental sounds to reach acoustic sensors, preserving spatial information locally without compromising overall audio quality.
Solution Approach 2:
The system adds a spatial dimension to audio delivery by using multiple acoustic sensors positioned to capture sounds from different directions and distances. This multi-dimensional acoustic sampling preserves spatial cues while maintaining audio quality through processed reconstruction of the three-dimensional soundscape.
3Measurement precision
If acoustic sensors are positioned close to the eardrum to capture sounds, then sound detection sensitivity is improved, but noise interference worsens
Solution Approach 1:
The system extracts environmental sound information through dedicated apertures in the housing that allow sounds to reach acoustic sensors without passing through the speaker or other noise-generating components. This extraction pathway isolates the acoustic sensors from near-field noise generated by the audio playback system, maintaining detection sensitivity while reducing noise interference.
Solution Approach 2:
Acoustic signals from the environment skip past the speaker and other potential noise sources by traveling through dedicated apertures and waveguides that provide direct pathways to the acoustic sensors. This skipping mechanism allows environmental sounds to reach the sensors rapidly without being contaminated by near-field noise from audio components.
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
Preserves monoaural and binaural spatial cues, enhances sound quality, and reduces noise interference, enabling users to safely interact with their environment while experiencing audio content.
Implementation Method 1
An acoustic sensor within the body detects the sounds from the local area
Implementation Method 2
The acoustic waveguide guides the sound to the acoustic sensor within the body
Implementation Method 3
The speaker broadcasts audio content, based in part on the sounds detected from the local area, to the user's ear canal
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An ear-plug assembly presents audio content to an ear canal of a user. The audio content may be based in part on sound in a local area surrounding the user. The ear-plug assembly detects, via one or more acoustic sensors, sound in the area around the user. The sound waves travel through an aperture in a body of the ear-plug assembly and are propagated to a waveguide to the one or more acoustic sensors. The ear-plug assembly processes the detected sound data in a controller, which instructs a speaker assembly to present audio content based in part on the detected sound data. The detected sounds may be amplified, attenuated, filtered, and/or augmented when presented by the speaker assembly.