Vehicle Wakefulness Device Dynamic Sound Pressure Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wakefulness-maintaining methods for drivers, such as changing music characteristics, face challenges in effectively maintaining wakefulness due to the difficulty in perceiving sound pressure changes, especially when vehicle exterior sounds are loud, leading to insufficient wakefulness maintenance.
Innovation Solution
A wakefulness-maintaining apparatus that analyzes ambient and control sounds, adjusts sound pressure changes based on frequency bands, and sets a control method to prevent familiarity, ensuring the driver perceives changes in sound characteristics, thereby maintaining wakefulness without causing annoyance from frequent sound switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sound pressure is changed by a fixed amount at regular intervals, then wakefulness maintenance is attempted, but the driver cannot perceive the change when vehicle exterior sound is large, resulting in insufficient wakefulness maintenance effect
Solution Approach 1:
The patent applies dynamics by making the sound pressure change amount variable rather than fixed. The control device dynamically adjusts the sound pressure change amount based on the detected exterior sound level, increasing the change amount when exterior sound is large to ensure the driver can perceive the change, and decreasing it when exterior sound is small to avoid excessive changes.
Solution Approach 2:
The patent changes the parameter of sound pressure change amount based on exterior sound conditions. By monitoring the exterior sound level and adjusting the sound pressure change parameter accordingly, the system ensures that the sound characteristic changes remain perceivable by the driver under varying external acoustic conditions.
2Reliability
If sound characteristics are changed frequently to prevent familiarity, then wakefulness is maintained, but the driver may feel annoyed due to frequent changes
Solution Approach 1:
The patent applies periodic action by changing sound characteristics at regular intervals that are equal to or shorter than a half cycle of the driver's sleep-wake rhythm. This timing strategy prevents the driver from becoming familiar with the sound while aligning with natural physiological cycles, thereby maintaining wakefulness without causing excessive annoyance.
Solution Approach 2:
The system dynamically determines the optimal timing for sound characteristic changes based on the driver's individual sleep-wake rhythm, rather than using a completely fixed schedule. This allows the periodic changes to be adapted to the driver's physiological state, balancing wakefulness maintenance with comfort.
3Reliability
If sound pressure change amount is increased to ensure perception, then wakefulness maintenance improves, but the control system becomes more complex
Solution Approach 1:
The patent implements feedback by using a microphone to detect the actual sound level inside the vehicle (including both the reproduced sound and exterior sound) and using this information to adjust the sound pressure change amount. This closed-loop feedback mechanism allows the system to automatically adapt to varying exterior sound conditions without requiring complex manual control.
Solution Approach 2:
The system performs self-service by automatically detecting exterior sound levels and adjusting the sound pressure change amount without external intervention. The control device monitors the acoustic environment and autonomously determines the appropriate sound characteristic changes to ensure driver perception and wakefulness maintenance.
Data Source
AI summary
A wakefulness-maintaining device capable of maintaining a driver's wakefulness by making the driver aware of changes in sound characteristics. A wakefulness-maintaining device (100), which maintains a person's wakefulness, wherein: a switching time control part (102) analyzes the characteristics of perceived sounds acquired by a microphone provided inside the vehicle, the perceived sounds comprising control sounds played back by the wakefulness-maintaining device (100) and environmental sounds around the person when no control sounds are being played back; an in-car sound-accumulating part (103) accumulates the perceived sounds; an acoustic pressure change-setting part (105) sets the control method to be used on the environmental sounds on the basis of the characteristics of the perceived sounds accumulated by the in-car sound-accumulating part (103); and a control sound-generating part (106) applies the control method, set by the acoustic pressure change-setting part (105), on the environmental sounds and generates control sounds.