Vehicle Cabin Audio Routing for Asymmetric Hearing Loss
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Solution Overview
Problem
Existing sound distribution systems in vehicles fail to address asymmetric or differential hearing loss between the left and right ears of users, leading to reduced audibility of important sounds for individuals with hearing impairments.
Innovation Solution
A vehicle system that utilizes smart sensors to detect seating positions and hearing limitations of occupants, adjusting sound delivery to focus audio alerts and ambient sounds to the dominant ear, and optionally reconfiguring seating arrangements to optimize sound reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If audio signals are distributed symmetrically to both ears using traditional speaker arrays, then the system maintains simplicity and uniform sound coverage, but users with differential hearing loss experience reduced audibility and ineffective alert reception
Solution Approach 1:
The system applies different audio signal characteristics to different spatial locations and ears. Specifically, audio alerts are directed preferentially to the dominant ear based on detected hearing asymmetry, while ambient sounds maintain more symmetric distribution. This local differentiation resolves the contradiction by tailoring sound distribution quality to specific user needs without completely redesigning the entire audio system.
Solution Approach 2:
The sound distribution system dynamically adjusts audio signal parameters based on real-time detection of occupant seating positions and hearing characteristics. The system can adapt the degree of asymmetry in sound distribution, switching between symmetric and asymmetric modes depending on detected user conditions, thereby maintaining reliability across varying operational scenarios.
2Reliability
If the system directs all audio signals preferentially to the dominant ear for users with differential hearing loss, then alert audibility is improved, but spatial localization of sound sources and naturalistic audio experience deteriorate
Solution Approach 1:
The system applies asymmetric sound distribution partially rather than completely. Ambient sounds and entertainment audio maintain more symmetric distribution to preserve spatial localization and naturalistic experience, while critical safety alerts receive preferential direction to the dominant ear. This partial application resolves the contradiction by applying asymmetry only where necessary for safety.
Solution Approach 2:
The audio signal stream is segmented into different categories (safety alerts, ambient sounds, entertainment) with different distribution strategies applied to each segment. Safety-critical signals are directed to the dominant ear with higher priority, while other audio content maintains more balanced distribution, preserving spatial information and natural audio experience.
3Adaptability or versatility
If the system uses multiple sensors and classifiers to detect hearing limitations and adjust sound delivery, then customization and effectiveness are improved, but system complexity and computational requirements increase
Solution Approach 1:
The system uses multi-functional existing vehicle components (microphones, speakers, existing audio processing infrastructure) to achieve hearing loss detection and compensation. By making these existing components serve multiple purposes including hearing assessment and adaptive sound distribution, the system achieves high adaptability without proportionally increasing overall system complexity.
Solution Approach 2:
The system performs self-calibration and automatic detection of user hearing characteristics without requiring manual input or external diagnostic equipment. The auditory classifier automatically analyzes audio signals and seating position data to identify dominant ears and hearing asymmetries, enabling the system to adapt to different users autonomously.
Data Source
AI summary
Various sounds are reproduced in a passenger cabin of a transportation vehicle with a plurality of positions for seating respective persons who may have differential hearing losses between a right ear and a left ear. A dominant ear and a nondominant ear are identified of a particular user in a respective seating position. Electrical audio signals are generated in a sound source intended for reproduction by an array of speakers disposed within the passenger cabin for directing reproduced sounds toward the seating positions from respective directions. The audio signals are differentially adjusted before sending them to the array of speakers such that reproduced sounds directed to the nondominant ear are attenuated in relation to the reproduced sounds directed to the dominant ear (i.e., the sound to the dominant ear is enhanced).