Vehicle Sound System with Dynamic Inaudible Audio Mode Switching
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Solution Overview
Problem
Vehicles lack an effective sound system that can seamlessly switch between modes to allow drivers to focus on driving and enjoy audio while ensuring safe driving conditions, particularly during changing traveling states.
Innovation Solution
A sound system for vehicles that includes an audio device capable of producing both audible and inaudible sounds, with a traveling state detector and switch controlling module to activate the inaudible sound only when the traveling state increases, and an engine sound localizer to position sounds for enhanced driver focus, using a processor to control sound localization and reproduction modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the audio sound including inaudible sound is reproduced in the cabin, then the driver's brain is activated to focus on driving, but the driver may experience brain fatigue from unnecessary inaudible sound reproduction
Solution Approach 1:
The audio device dynamically switches between two reproduction modes based on real-time detection of the vehicle's traveling state. The system transitions from a static audio reproduction setup to a dynamic one that adapts to changing driving conditions, activating inaudible sounds only when needed to maintain driver focus while avoiding unnecessary brain fatigue during normal driving conditions.
Solution Approach 2:
The system changes the parameter of audio content by selectively including or excluding inaudible sounds based on the detected traveling state. This parameter modification allows the same audio device to serve different functions: enhancing driver focus during high-load driving while preventing brain fatigue during normal driving, thus resolving the contradiction between improving driver focus and preventing harmful effects.
2Ease of operation
If the audio device reproduces only audible sound, then the driver can relax and enjoy audio, but the driver may not focus sufficiently on driving during high operation loads
Solution Approach 1:
The audio reproduction system dynamically adapts to the driving situation by switching between relaxed audio mode (audible sound only) and focused audio mode (audible plus inaudible sound). This dynamic adjustment allows the system to provide relaxation during normal driving while ensuring driver focus during high operation loads, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The system incorporates feedback from the traveling state detector to automatically adjust audio reproduction. When the detector identifies high operation load conditions, the system receives feedback and switches to including inaudible sounds to enhance driver focus. This feedback mechanism ensures that relaxation is maintained during normal conditions while automatically providing focus enhancement when needed, resolving the contradiction between ease of operation and reliability.
3Loss of information
If the localized position of audio sound is set far from engine sound position, then the driver can clearly distinguish audio sound from engine sound, but the driver's brain is not effectively activated to focus on driving
Solution Approach 1:
The localized position controlling module dynamically adjusts the spatial relationship between audio sound and engine sound based on the detected traveling state. During high operation loads, the system dynamically brings the localized positions closer together to activate the driver's brain through the hypersonic effect, while maintaining separate positions during normal driving to ensure clear sound distinction, thus resolving the contradiction between information clarity and focus enhancement.
Solution Approach 2:
The system changes the spatial parameter of sound localization by adjusting the distance between the localized position of audio sound and engine sound. This parameter modification allows the system to optimize for either clear distinction or brain activation depending on the driving condition, resolving the contradiction between loss of information and reliability by adapting the parameter to the current state.
Data Source
AI summary
A sound system for a vehicle including an engine and an audio device for an internal space of a cabin as sound sources disposed at given positions of the vehicle is provided. The audio device is switchable between a first mode in which an audio sound including both an audible sound and an inaudible sound for a human is reproduced in the cabin and a second mode in which an audio sound including the audible sound but not including the inaudible sound is reproduced in the cabin. The sound system includes a traveling state detector configured to detect a traveling state of the vehicle, and a switch controlling module executable by a processor configured to reproduce the audio sound in the first mode under a condition that a given traveling state is detected by the traveling state detector.