Loudspeaker Array With Adjustable Directivity For Spatial Resolution
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Solution Overview
Problem
Current sound reproduction systems, such as soundbars, face limitations in providing high spatial resolution and a large usable listening area, especially with two- and three-dimensional audio formats like Higher-Order Ambisonics, due to fixed loudspeaker configurations and limited directional control.
Innovation Solution
A sound reproduction system utilizing a horizontal linear array of closely spaced higher-order loudspeaker assemblies with adjustable directivity characteristics, driven by a control module to steer and control acoustic wave fields, allowing for flexible sound source positioning and enhanced spatial sound impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed loudspeaker configurations are used in traditional soundbars, then the device complexity is reduced and ease of manufacture is improved, but the spatial resolution and usable listening area are limited
Solution Approach 1:
The patent implements adjustable directivity characteristics through electronic control of loudspeaker assemblies. The control module dynamically modifies the radiation patterns and beamforming of multiple loudspeakers to create steerable sound fields, transforming a static configuration into a dynamic system that adapts to different spatial requirements without changing physical hardware
Solution Approach 2:
The soundbar is divided into multiple independent loudspeaker assemblies, each capable of individual control and directional adjustment. This segmentation allows each unit to contribute to the overall spatial sound field with specific directional characteristics, enabling high spatial resolution through coordinated operation of discrete elements rather than a single fixed configuration
2Area of stationary object
If traditional loudspeaker arrays are used, then the device complexity is lower, but the sweet spot size and listening area are reduced
Solution Approach 1:
The patent extends the traditional horizontal loudspeaker arrangement by adding vertical dimension with loudspeakers pointing in different directions (upward, downward, sideways). This three-dimensional spatial arrangement of sound sources creates a volumetric sound field that enlarges the usable listening area beyond what planar arrays can achieve
Solution Approach 2:
Each loudspeaker assembly serves multiple functions: it can radiate sound in different directions, participate in beamforming to create focused sound fields, and contribute to both stereo and surround sound reproduction. This multi-functionality allows a compact array to achieve large sweet spot coverage without proportionally increasing complexity
3Adaptability or versatility
If loudspeakers point in fixed directions, then the ease of operation is improved, but the directivity control and sound field steering capability are limited
Solution Approach 1:
The control module receives input signals and dynamically adjusts the phase, amplitude, and timing of each loudspeaker assembly to achieve desired directivity patterns. This closed-loop control enables real-time steering of acoustic wave fields and adaptation to different listening positions, providing versatile directivity control through electronic feedback mechanisms
Solution Approach 2:
The control module acts as an intermediary between the input audio signal and the multiple loudspeaker assemblies. It processes the signal to generate appropriate drive signals for each loudspeaker, coordinating their operation to create steerable beam patterns and controlled directivity without requiring manual adjustment of each component
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
The system achieves improved spatial sound reproduction with increased resolution and a larger sweet spot, enabling precise stereo and natural staging, even in acoustically unfavorable environments, with fewer loudspeakers required compared to traditional systems.
Implementation Method 1
each loudspeaker assembly including at least two identical or similar loudspeakers pointing in different directions
Data Source
AI summary
At least two closely spaced identical or similar loudspeaker assemblies in a horizontal linear array, each loudspeaker assembly comprising at least two identical or similar loudspeakers pointing in different directions so that the loudspeaker assemblies have adjustable, controllable or steerable directivity characteristics. For example, a control module may drive, adjust, control, or steer the loudspeaker assemblies so that at least one acoustic wave field is generated at least at one listening position.