In-Cabin Spatial Audio Alerts for Directional Hazard Localization
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Solution Overview
Problem
Conventional in-vehicle warning systems are non-directional, requiring drivers to scan mirrors and displays to locate obstructions, and emergency vehicle sirens are often inaudible due to cabin noise or insulation, hindering effective situational awareness.
Innovation Solution
Utilizing OEM sensors and speakers to spatially convey the location and distance of entities relative to the driver through directional audio warnings, synthesizing or re-broadcasting emergency sirens to ensure perceptibility and incorporating audio gain based on distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional non-directional warning systems are used, then the system is simple to implement, but the driver cannot quickly locate obstructions and must scan mirrors and displays
Solution Approach 1:
The patent applies local quality by routing audio warnings through specific speakers located on the side of the detected obstruction. This creates a directional audio signal that provides spatial information about the obstruction's location, allowing the driver to immediately identify where to look without scanning multiple mirrors and displays. The warning sound emanates from the speaker nearest to the obstruction, creating a localized auditory cue that matches the spatial position of the hazard.
2Object-affected harmful factors
If cabin insulation is increased to reduce interior noise, then comfort is improved, but emergency vehicle sirens become inaudible
Solution Approach 1:
The patent uses an intermediary approach by introducing electronic audio processing and synthesis systems that detect external siren sounds through external microphones and re-broadcast them through interior speakers. This intermediary system overcomes the barrier created by cabin insulation, allowing drivers to hear emergency sirens clearly despite the noise-reducing insulation. The system acts as a mediator between the external acoustic environment and the insulated cabin interior.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting audio gain and frequency characteristics of siren detection and playback. The system enhances siren frequencies that penetrate cabin insulation and adjusts volume levels based on detected siren proximity and intensity. This parameter optimization ensures that emergency sirens remain audible through the insulated cabin while maintaining comfort from other interior noises.
3Loss of information
If directional audio warnings are implemented using OEM speakers, then spatial awareness is enhanced, but the system complexity increases
Solution Approach 1:
The patent applies universality by utilizing the vehicle's existing OEM speaker system for multiple functions: regular audio playback, directional warning signals, and emergency siren detection/re-broadcasting. By making the existing speaker system multi-functional, the patent avoids adding dedicated speakers for each function, thereby reducing overall system complexity while still achieving directional audio warnings and spatial awareness enhancement.
Solution Approach 2:
The patent merges multiple audio functions into a unified processing system that handles warning signals, siren detection, and spatial audio routing through a single integrated architecture. The audio processing module combines obstruction detection warnings, siren detection, and directional routing logic into one system, reducing the need for separate independent systems and simplifying the overall device complexity while maintaining enhanced spatial awareness capabilities.
Data Source
AI summary
A vehicle system uses OEM sensors and OEM speakers to spatially convey, inside the cabin, the location and distance of real-world entities relative to a driver. A processor determines a directional bearing and, when available, a distance from proximity sensors, integrated cameras, or a directional microphone. An audio generation module produces a warning that is routed only to the speakers on the side that corresponds with the bearing, with audio gain set as a function of distance so closer entities sound louder. For emergency vehicles, the system synthesizes a siren or isolates and re-broadcasts the original siren, then plays the siren only through the speakers that correspond with the detected bearing. An interior microphone gates synthesis when the original siren is already audible. The approach enables drivers to localize pedestrians and other hazards by sound.