Microphone Directivity Modeling via Signal Weighting
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Solution Overview
Problem
Existing microphone systems fail to accurately model directivity patterns, leading to reduced sound quality due to deviations from ideal directional behavior and reliance on theoretical signal equalization rather than real-world sound patterns.
Innovation Solution
A system that combines and modifies microphone capsule signals using weighting factors to generate arbitrary directivity patterns, allowing for rotational adjustment and measurement-based optimization of directivity factors to achieve desired sound patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If theoretical signal equalization is used to model directivity patterns, then the modeling process is simplified, but the accuracy of sound pattern representation deteriorates due to reliance on theoretical rather than real-world sound patterns
Solution Approach 1:
The patent implements feedback by measuring actual directivity patterns of the microphone and using these measurements to adjust and optimize the signal combination weights. The measured directivity factors are compared with ideal values, and the weighting factors are iteratively adjusted until the modeled directivity pattern matches the desired pattern, thereby improving accuracy while maintaining computational simplicity
Solution Approach 2:
The patent replaces mechanical design changes with signal processing operations. Instead of physically adjusting microphone capsule positions or orientations to achieve desired directivity patterns, the system uses digital signal combination and weighting to synthesize the required patterns, simplifying the physical design while enabling flexible pattern control
2Measurement precision
If mechanical design changes are made to achieve desired directivity patterns, then the directivity pattern accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent substitutes mechanical adjustments with electronic signal processing. The directivity patterns are achieved through digital combination of signals from fixed microphone capsules using adjustable weighting factors, eliminating the need for precise mechanical positioning or physical redesign of the microphone structure
Solution Approach 2:
The patent changes the weighting factors of combined signals to achieve different directivity patterns. By adjusting these software-controlled parameters, the system can switch between various directivity patterns (omnidirectional, cardioid, figure-eight, etc.) without any physical or mechanical modifications to the microphone hardware
3Adaptability or versatility
If signal weighting factors are adjusted to achieve specific directivity patterns, then the versatility of directivity pattern selection is improved, but the complexity of signal processing increases
Solution Approach 1:
The patent creates a universal signal processing framework that can generate multiple directivity patterns (omnidirectional, cardioid, supercardioid, hypercardioid, figure-eight, and arbitrary patterns) using the same hardware configuration and signal combination methodology, achieving multi-functionality through software flexibility
Solution Approach 2:
The patent achieves versatility by changing the weighting factors applied to individual capsule signals. Different sets of weighting factors produce different directivity patterns, allowing the system to adapt to various application requirements through simple parameter adjustment rather than complex processing algorithms
Data Source
AI summary
A system that models a microphone may include capsules that receive individual signals. The signals may be combined and modified based on a weighting factor. Directivity patterns of a converted signal may be modified or controlled based on the weighting of the signals.