Vehicle Sound Effect Gain Correction via Feedback Loop
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Solution Overview
Problem
Existing sound effect generating devices for vehicle passenger compartments do not adequately account for performance variations and aging of sound output means, leading to inconsistent sound effects.
Innovation Solution
A sound effect generating device that includes traveling state detection, waveform data tables, reference signal generation, acoustic control, gain adjustment, and sound effect detection to correct gains based on predicted and measured values, ensuring consistent output levels despite aging or performance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gain adjustment is performed based on traveling state only, then sound effect generation is simple, but output level consistency deteriorates due to aging and performance variations
Solution Approach 1:
The patent implements a feedback mechanism where the actual sound output is measured by a sound pressure meter, compared with the target sound pressure level, and the gain is adjusted based on the difference. This closed-loop feedback system compensates for aging and performance variations of the sound output means, ensuring consistent output levels without significantly increasing system complexity.
Solution Approach 2:
The sound effect generating device performs self-calibration by using its own output as the measurement target. The system automatically adjusts its gain based on the measured sound pressure, enabling it to compensate for its own aging and performance degradation without requiring external intervention or complex additional components.
2Measurement precision
If individual gain tables are used for each device, then output accuracy is improved, but manufacturing and deployment complexity increases
Solution Approach 1:
The patent creates a master gain table through calibration that can be universally applied to multiple sound effect generating devices. This single standardized gain table serves all devices, eliminating the need for individual customization while maintaining accuracy. The universal gain table compensates for common aging patterns and performance variations across the device population.
Solution Approach 2:
The system performs preliminary calibration to generate the gain table before actual operation. This advance preparation creates a reference gain table that accounts for typical device characteristics and aging patterns. By performing this calibration action beforehand, the system simplifies subsequent deployments and ensures consistent performance across multiple devices without requiring individual setup.
Data Source
AI summary
A control signal generating means of a sound effect generating device sets the reference volume that is the reference value of the volume of a sound effect when a vehicle is in a predetermined travel state, compares the measured volume of the sound effect detected by a sound effect detecting means when the vehicle is in the predetermined travel state and the reference volume, and corrects the gain of a control signal on the basis of the result of the comparison.