Vehicle Speaker Array Virtual Sound Source Posture Correction
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Solution Overview
Problem
In vehicles with in-vehicle sound devices, changes in occupant posture cause discomfort due to shifting gaze angles towards a fixation point, particularly pronounced in saddle-riding vehicles like motorcycles where posture changes are more significant.
Innovation Solution
A vehicle equipped with multiple speakers and a sound control system that acquires occupant posture information to adjust the position and volume of a virtual sound source, ensuring the sound source remains aligned with the driver's gaze regardless of posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the virtual sound source position is fixed at a predetermined position, then the sound control system is simple, but the occupant feels discomfort when posture changes
Solution Approach 1:
The virtual sound source position is made dynamic rather than fixed. The sound control portion adjusts the virtual sound source position based on detected occupant posture, allowing the system to adapt to changing conditions while maintaining simplicity through automated control
Solution Approach 2:
The system uses feedback from the occupant posture detection portion to continuously monitor and adjust the virtual sound source position. This closed-loop control ensures occupant comfort is maintained while the system automatically compensates for posture changes
2Reliability
If the virtual sound source position is adjusted based on occupant posture, then occupant comfort is improved, but the device complexity increases
Solution Approach 1:
The sound control portion performs multiple functions: it controls sound output from speakers, adjusts virtual sound source position, and integrates with the occupant posture detection system. This multi-functionality reduces the need for separate dedicated components
Solution Approach 2:
The system uses an intermediary approach by detecting occupant posture indirectly through sensors and using this information to calculate the appropriate virtual sound source position, rather than directly measuring or mechanically adjusting the sound source based on head position
Data Source
AI summary
A vehicle includes an in-vehicle device and a speaker array. The in-vehicle device acquires information that identifies a posture of an occupant of the vehicle by use of an occupant posture acquisition portion. The in-vehicle device controls a sound outputted from the speaker array to a sound arriving from a virtual sound source that is set at a predetermined position, and corrects the position of the virtual sound source based on the posture of the occupant by use of a sound control portion.