Nonuniform Asymmetric Speaker Driver Array for Interference Reduction
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Solution Overview
Problem
Conventional speaker arrays with uniformly spaced drivers suffer from limited omnidirectional frequency response and small sweet spots due to destructive interference, leading to attenuated sound quality at off-axis positions, which compromises the listening experience for multiple listeners.
Innovation Solution
The use of nonuniform and asymmetric spacing between electrically coupled transducers, optimized using discrete-time Fourier transforms to minimize destructive interference and enhance frequency response across a wider range of angles, along with frequency-selective filtering to route low-frequency signals to all drivers and high-frequency signals to a subset, thereby reducing nulls and maintaining output power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform spacing between speaker drivers is used, then the array structure is simple and easy to manufacture, but the frequency response exhibits attenuation and response notches at higher frequencies and off-axis positions
Solution Approach 1:
The patent applies asymmetry by using nonuniform spacing between speaker drivers in the array. Specifically, the spacing between adjacent drivers varies rather than being uniform, which disrupts the regular interference patterns that cause lobing and response notches. This asymmetric configuration maintains manufacturing simplicity while significantly improving frequency response quality and omnidirectional characteristics.
2Reliability
If frequency-selective filtering and out-of-phase coupling are used, then the frequency response is improved, but the broadband output power is compromised
Solution Approach 1:
The patent changes the physical parameter of driver spacing from uniform to nonuniform values. This parameter modification directly improves frequency response quality by reducing destructive interference patterns, while maintaining all drivers in phase and operating at full power, thus preserving broadband output power without requiring filtering or phase manipulation.
3Device complexity
If uniform spacing is used, then the array configuration is simple, but the sweet spot region is small and listeners must be precisely positioned
Solution Approach 1:
The nonuniform spacing creates an asymmetric array configuration that produces a broader main lobe in the radiation pattern. This asymmetry in spacing prevents the formation of narrow, frequency-dependent lobes, thereby expanding the sweet spot region and allowing listeners to move freely without experiencing significant frequency response variations.
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
This configuration results in a flatter frequency response and expanded sweet spots, allowing for improved sound fidelity and listener mobility without compromising output power, as demonstrated by reduced attenuation and deeper null avoidance in simulations.
Implementation Method 1
the sound characteristics at any position and frequency are a function of constructive and destructive interference caused by the sound waves emanating from the individual drivers in the array
Data Source
AI summary
A transducer array includes speaker drivers having nonuniform asymmetric spacing. The array includes at least three drivers formed along a line or arc. The first of the drivers is positioned having a first spacing from an adjacent second driver that is different from a second spacing between the second driver and its adjacent third driver.