Automated Sound Tuning with Delay and EQ Transfer-Function Matching
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Solution Overview
Problem
Manual sound tuning in motor vehicles is time-consuming, requires high expertise, and involves complex interactions between multiple parameters, making it difficult to achieve optimal sound quality across all listening positions.
Innovation Solution
An automated sound tuning method using adaptive filters and a control unit to adjust delay lines and equalizing filters, based on measured sound pressure values and a target transfer function, to approximate the desired sound system characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual sound tuning is performed by acousticians using experimental values and trained hearing, then sound quality can be optimized subjectively, but the process becomes time-consuming and requires high expertise
Solution Approach 1:
The patent replaces the manual mechanical adjustment process with an automated electronic system. A computer-controlled system automatically adjusts delay lines, equalizing filters, and other sound system parameters based on measured transfer functions, eliminating the need for manual intervention by acousticians while maintaining optimization quality.
Solution Approach 2:
The sound system performs self-tuning through automated measurement and adjustment. The system measures its own transfer function using microphones at various listening positions, processes the data, and automatically adjusts its parameters without external assistance, enabling the system to optimize itself independently.
2Manufacturing precision
If multiple parameters are adjusted manually to achieve optimal sound impression, then sound quality can be improved, but the complex interactions between parameters make the procedure iterative and require high expertise
Solution Approach 1:
The system implements closed-loop feedback by measuring the actual transfer function at multiple listening positions and comparing it with target values. Based on the measured deviations, the system automatically adjusts parameters iteratively until optimal sound quality is achieved, eliminating the need for expert manual iteration.
Solution Approach 2:
The system automatically modifies multiple parameters including delay times, filter coefficients, and gain values based on measured transfer function data. The computer-controlled system systematically varies these parameters to optimize the sound field across all listening positions, handling the complex parameter interactions that would be difficult for humans to manage.
3Productivity
If automated tuning methods are implemented, then the tuning process can be simplified and accelerated, but achieving optimal sound quality across all listening positions becomes more challenging
Solution Approach 1:
The patent divides the sound optimization task into separate frequency bands using equalizing filters. Each frequency range is independently adjusted based on measured transfer function characteristics, allowing the system to handle complex multi-frequency optimization systematically while maintaining overall sound quality across all listening positions.
Data Source
AI summary
The invention relates to a method for automated tuning of a sound system, the sound system comprising delay lines, equalizing filters, and at least two loudspeakers, the method comprising the steps of reproducing a useful sound signal through the loudspeakers, measuring sound pressure values at least one location, providing a target transfer function for tuning the delay lines and the equalizing filters of the sound system, the target transfer function representing a desired transfer characteristics of the sound system, adjusting the delay of the delay lines, and adjusting amplitude responses of the equalizing filters such, that the actual transfer characteristics of the sound system approximates the target function.