Vehicle Speaker Array Posture Control for Virtual Sound Source Positioning
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Solution Overview
Problem
Existing vehicle sound systems struggle to maintain the position of a virtual sound source when the vehicle tilts laterally, particularly in motorcycles, leading to offsetting issues that are difficult to correct through signal processing alone and require complex speaker configurations.
Innovation Solution
A vehicle equipped with multiple speakers and a sound control system that adjusts the speakers' posture relative to the vehicle, using a three-dimensional acceleration sensor to detect changes and tilt the speaker array to maintain the virtual sound source's position, ensuring it remains aligned with the road surface during lateral tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle body tilts laterally during cornering, then the virtual sound source position offsets relative to the road surface, but signal processing alone cannot easily correct this offset
Solution Approach 1:
The speaker array is made dynamically adjustable in posture relative to the vehicle body. The sound control portion changes the posture of the speaker array based on detected vehicle posture changes, enabling the virtual sound source position to be maintained accurately without requiring complex fixed speaker configurations.
Solution Approach 2:
The system changes the physical parameter of speaker array orientation by adjusting its posture angle according to vehicle tilt. This parameter change allows the sound projection direction to compensate for vehicle banking, maintaining accurate virtual sound source positioning on the road surface.
2Measurement precision
If vertically spaced speakers are used to upwardly correct the virtual sound source position, then the position offset can be compensated, but the device configuration becomes complicated
Solution Approach 1:
Instead of using a complex fixed vertical speaker arrangement, the system employs a single speaker array that dynamically adjusts its posture angle. This dynamic adjustment achieves the same position correction effect with a simpler, more flexible configuration.
3Adaptability or versatility
If the speaker array posture is fixed relative to the vehicle, then the structure is simple, but the virtual sound source position cannot be adjusted to compensate for vehicle tilting
Solution Approach 1:
The speaker array is configured with adjustable posture relative to the vehicle body, enabling it to adapt to different vehicle tilting conditions. This dynamic capability provides position adjustability while maintaining reasonable system simplicity through centralized control.
Solution Approach 2:
The sound control portion receives feedback from posture detection (vehicle tilt information) and automatically adjusts the speaker array posture accordingly. This closed-loop feedback mechanism enables adaptive position correction without requiring complex manual intervention or over-engineered systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the adjustability of the virtual sound source's position, reducing discomfort and improving the driver's ability to focus on the road ahead by preventing positional changes caused by vehicle tilting, especially in motorcycles.
Implementation Method 1
a three-dimensional acceleration sensor (54) that detects a postural change of the vehicle including a tilt of the vehicle in the width direction
Implementation Method 2
The sound control portion (58C) changes the sound outputted from the speakers (31) to sound arriving from a virtual sound source that is set at a predetermined position
Data Source
AI summary
A vehicle includes an in-vehicle device and a speaker array. The in-vehicle device is capable of changing a sound outputted from the speaker array to a sound arriving from a virtual sound source that is set to a predetermined position by use of a sound control portion. The speaker array is configured to be changeable in posture relative to the vehicle and to adjust a position of a virtual sound source relative to the vehicle.