Dual-Array Loudspeaker Acoustic Radiation Pattern Control
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Solution Overview
Problem
Professional loudspeakers face challenges in achieving uniform sound coverage in asymmetric spaces due to varying room geometries, as single devices struggle to create sharp transitions and unique radiation patterns required by different locations in a room.
Innovation Solution
A dual-array loudspeaker system is employed, where two distinctly different transducers are aligned in the same direction to generate a derived radiation pattern by manipulating the primary radiation pattern with a secondary radiation pattern, allowing for unique acoustic radiation patterns tailored to specific room geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single loudspeaker device is used, then the device complexity is low, but the ability to create sharp transitions and unique radiation patterns is insufficient
Solution Approach 1:
The loudspeaker system is segmented into multiple independent transducers (primary and secondary arrays), each capable of generating its own radiation pattern. This segmentation allows each transducer to be optimized for specific functions while collectively achieving complex radiation patterns that a single device cannot produce.
Solution Approach 2:
Multiple transducers are merged into a unified loudspeaker system where their radiation patterns are combined through acoustic interference. The primary and secondary arrays work together to create derived radiation patterns with sharp transitions, merging individual capabilities into a superior collective performance.
2Adaptability or versatility
If transducers are positioned to cover asymmetric room geometries, then the adaptability to room shapes improves, but achieving uniform sound coverage becomes more difficult
Solution Approach 1:
Different regions of the radiation pattern are given different qualities through the interaction of primary and secondary transducers. The system creates localized variations in radiation intensity and direction, allowing optimization for specific room geometries while maintaining overall uniformity through controlled interference patterns.
Solution Approach 2:
The radiation pattern is made dynamic and adjustable through electronic control of multiple transducers. By varying the amplitude and phase of each transducer, the system can adapt its radiation characteristics to match different room geometries and audience positions, achieving both adaptability and uniformity.
3Adaptability or versatility
If the secondary transducer operates at high sound output level, then the radiation pattern manipulation capability improves, but the overall system balance deteriorates
Solution Approach 1:
The secondary transducer operates at a reduced output level compared to the primary transducer, providing just enough acoustic energy to effectively manipulate the radiation pattern through interference. This partial action is sufficient for pattern control while avoiding the imbalance that would result from equal or excessive secondary output.
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 approach enables the creation of sharp, unique radiation patterns that match the geometry of asymmetric spaces, ensuring consistent sound coverage across different locations while minimizing hot spots and enhancing pattern control across various frequency ranges.
Implementation Method 1
A primary transducer produces a primary radiation pattern in a primary plane
Implementation Method 2
A secondary transducer is positioned a distance in the primary plane from the primary transducer and produces a secondary radiation pattern different from the primary radiation pattern in the primary plane, wherein the secondary radiation pattern modifies the primary radiation pattern to produce a derived primary radiation pattern
Data Source
AI summary
One or more embodiments of the present disclosure utilize two distinctly different radiation devices aimed in the same direction to create a derived acoustic radiation pattern. The radiation devices may be distinctly different in terms of the acoustic radiation pattern each radiation device generates individually. The derived acoustic radiation pattern is unique to the individual acoustic radiation patterns of either of the two radiation devices. Manipulation of several key design variables allows a multitude of unique patterns to be derived in this way using only the two radiation devices. In turn, this allows for engineering an acoustic radiation pattern to match the unique geometry of a room.