Vehicle Audio Delay Calibration for Listener Position Adaptation
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Solution Overview
Problem
Existing vehicle-mounted sound reproduction systems face challenges in providing optimal audio reproduction effects due to variations in listener positions caused by differences in height, body form, and riding habits, leading to inaccurate delay parameters and inconsistent audio quality among passengers.
Innovation Solution
A vehicle-mounted sound reproduction signal delay method that sets a coordinate reference system, measures loudspeaker unit coordinates, and adjusts delay parameters based on personalized listener positions using impulse response measurements and ergonomic data to optimize audio reproduction for individual listeners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional sound reproduction method is adopted considering all seats, then the system can provide basic audio reproduction for all passengers, but the listening effect at each position is not optimal because listeners are not at the center position
Solution Approach 1:
The system dynamically adjusts delay parameters based on the detected listening center position. Instead of using fixed delay values, the system calculates and applies position-specific delay corrections to optimize audio reproduction for listeners at various seats, transforming the static system into an adaptive one.
Solution Approach 2:
The system changes the delay parameters according to the detected listening center position. By measuring the actual position and calculating corresponding delay values, the system modifies its operational parameters to match the listener's location, thereby improving audio accuracy for non-center positions.
2Measurement precision
If the listener at a certain seat is considered by channel delay adjusting method, then the optimal listening effect is created for the target listener, but the system cannot provide optimal experience for all passengers simultaneously
Solution Approach 1:
The system provides universal adaptability by implementing a detection and adjustment mechanism that works for any listener position. Rather than being optimized for a single seat, the system can detect and adapt to the listening center regardless of which seat the listener occupies, making the solution universally applicable to all passengers.
Solution Approach 2:
The system dynamically determines the listening center position and adjusts delay parameters accordingly. This dynamic approach allows the system to switch between different optimization targets based on actual usage, providing optimal experience for whichever seat the listener occupies rather than being fixed to one position.
3Reliability
If frequency division loudspeaker units are separately arranged at different positions to optimize sound radiation, then the frequency response characteristics are improved, but the flare angle and distance differences relative to the center position become significantly different, creating processing difficulties
Solution Approach 1:
The system applies position-specific delay corrections to each loudspeaker unit based on its spatial relationship to the detected listening center. Rather than using a uniform processing approach, the system tailors the signal processing to the local geometric conditions of each speaker-listener pair, optimizing frequency response while accounting for position-specific variations.
Solution Approach 2:
The system pre-calculates delay parameters based on the detected listening center position and the known positions of all loudspeaker units. By performing this calculation in advance before audio playback, the system prepares the appropriate delay values, simplifying the real-time processing requirements while maintaining accuracy for the separated frequency division loudspeakers.
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
The method ensures accurate delay parameters for personalized audio reproduction, enhancing spatial auditory effects and improving audio quality for different listeners by adapting to their specific positions.
Implementation Method 1
measuring and acquiring an impulse response from each loudspeaker unit to the initial listening center
Data Source
AI summary
Disclosed is a vehicle-mounted sound reproduction signal delay method adapted to a listening center position. The method includes the following steps: presetting a coordinate reference system to acquire coordinates of each loudspeaker unit, and setting position coordinates of an initial listening center to acquire an initial distance parameter set for signal processing of a vehicle-mounted sound reproduction system; measuring and acquiring an impulse response from each loudspeaker unit to the initial listening center, and extracting and obtaining an initial delay parameter set; acquiring position coordinates of a new listening center in a specific manner, and acquiring a distance parameter set of each loudspeaker unit relative to the new listening center; and generating optimized delay parameters adapted to a new listener based on the distance parameter set relative to the new listening center.