Convertible Acoustic System Top Position Switching
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Solution Overview
Problem
Convertible vehicles present challenges for hands-free communication due to changes in acoustic parameters when the top is down, leading to distorted speech and microphone saturation, which existing systems fail to address effectively.
Innovation Solution
A dynamic acoustic system for convertible vehicles that determines the position of the convertible top and switches between two audio reception configurations, using a uni-directional microphone and tuning parameters when the top is up, and an omni-directional microphone and different tuning parameters when the top is down, to improve speech reception quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed acoustic configuration is used in convertible vehicles, then the system is simple to operate, but speech reception quality deteriorates when the top is down due to distortion and microphone saturation
Solution Approach 1:
The acoustic system dynamically adapts its configuration based on the convertible top position. The system automatically switches between different acoustic parameter sets and microphone configurations when detecting top-down versus top-up states, ensuring optimal speech reception quality for each operating condition without requiring manual user intervention.
Solution Approach 2:
The system changes acoustic parameters such as microphone sensitivity, equalization settings, and noise cancellation thresholds based on the detected top position. By adjusting these parameters dynamically, the system maintains reliable speech reception whether the top is up or down, resolving the contradiction between operational simplicity and reception quality.
2Adaptability or versatility
If the top is down for open-air driving, then the vehicle provides better ventilation and airflow, but acoustic parameters change causing speech distortion and unintelligibility
Solution Approach 1:
The system uses feedback from position sensors to detect the convertible top state and automatically adjusts acoustic parameters accordingly. This closed-loop control ensures that speech reception remains intelligible whether the top is up or down, maintaining communication quality while allowing the vehicle to operate in both enclosed and open configurations.
Solution Approach 2:
The acoustic system modifies its operational parameters based on the top position detected by sensors. When the top is down, the system adjusts microphone gain, noise filtering, and echo cancellation parameters to compensate for wind noise and acoustic distortion, thereby preserving speech intelligibility while maintaining the open-air driving experience.
3Reliability
If the top is up for enclosed cabin environment, then speech transmission is clear, but the vehicle lacks ventilation and open-air driving capability
Solution Approach 1:
The acoustic system dynamically reconfigures its parameters based on real-time detection of the convertible top position. When the top is up, the system uses optimized parameters for enclosed cabin acoustics, and when the top is down, it automatically switches to parameters suited for open-air conditions, thereby maintaining reliable speech transmission regardless of the vehicle's configurational state.
Solution Approach 2:
The acoustic system is designed to universally handle both top-up and top-down operating conditions with a single integrated system. By incorporating multiple acoustic parameter sets and automatic configuration switching, the system provides reliable speech transmission quality in both enclosed and open configurations, eliminating the need for separate acoustic systems for each mode.
Data Source
AI summary
A method of configuring an acoustics system of a convertible vehicle to receive speech from an occupant of the vehicle who is using hand-free technology. The position of the top of the convertible is first determined and based upon whether the top is up or down, an audio reception configuration is selected. The audio reception configuration includes a set of tuning parameters and a microphone arrangement. The acoustics system is then configured based upon the determination of whether the top is up or down.