Car Sound Field Optimization via Acoustic Response Modeling
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Solution Overview
Problem
Current intelligent cockpit audio systems fail to achieve an optimal sound field effect in separate vocal areas within a car, leading to imperfect sound division and experience.
Innovation Solution
A sound field optimization method using a first speaker at the front seat back and a second speaker at the rear seat headrest, which involves building acoustic response models for controlled and uncontrolled areas, calculating optimal audio parameters to maximize acoustic response difference, and controlling speakers to output signals accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If directional radiation control is used by a speaker at the seat back or headrest, then separate vocal area division is achieved in a controlled area, but the sound field effect is imperfect and mono soundtrack is limited
Solution Approach 1:
The rear seat area is segmented into multiple controlled areas (first controlled area and second controlled area) with different acoustic characteristics. Each area has its own acoustic response model and transfer function, allowing independent sound field optimization for different spatial zones within the vehicle cabin.
Solution Approach 2:
Different audio parameters are applied to different speakers based on their local acoustic environments. The first speaker has first audio parameters optimized for the first controlled area, while the second speaker has second audio parameters optimized for the second controlled area, creating locally optimized sound fields rather than uniform treatment.
2Adaptability or versatility
If inverted sound source counteraction is used by a speaker on the car door, then some separate vocal area effect is achieved, but the sound field effect remains imperfect
Solution Approach 1:
The system uses acoustic response transfer functions that represent the acoustic characteristics from each speaker to reference positions in different controlled areas. This feedback mechanism allows the system to understand how sound propagates in each specific area and adjust audio parameters accordingly to achieve consistent and reliable sound field effects.
Solution Approach 2:
The system calculates optimal audio parameters (such as amplitude, phase, frequency characteristics) for each speaker based on the acoustic response difference between controlled and uncontrolled areas. By dynamically adjusting these parameters, the system achieves reliable and consistent sound field separation effects.
3Manufacturing precision
If acoustic response models are built for multiple controlled areas with different transfer functions, then sound field optimization is improved, but calculation complexity increases
Solution Approach 1:
The acoustic space is segmented into distinct controlled areas, each with its own transfer function and acoustic response model. This segmentation allows the complex overall problem to be divided into manageable sub-problems that can be solved independently and then combined.
Solution Approach 2:
The system focuses optimization efforts on the controlled areas where passengers are actually located, rather than attempting to optimize the entire vehicle cabin uniformly. By concentrating computational resources on relevant areas with higher acoustic response differences, the system achieves high precision without excessive overall complexity.
Data Source
AI summary
The invention provides a sound field optimization method, including steps of building up a first acoustic response model for a controlled area inside a car and building up a second acoustic response model for an uncontrolled area inside the car; building up a first acoustic response difference calculation model based on the first acoustic response model and the second acoustic response model; calculating optimal solution of audio parameters; and controlling each speaker to output audio signals according to corresponding optimal solution of audio parameters. Thus, the vocal area isolation is achieved, so as to provide more extreme acoustic hearing, sound field effect in the controlled area where the user is located inside the car is optimized.