Loudspeaker Transducer Array Vibration Damping
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Solution Overview
Problem
Flush-mounted in-wall or in-ceiling loudspeaker systems face challenges in minimizing energy transmission to building structures and second-order low frequency signal propagation, leading to signal degradation and fidelity loss due to inadequate rear-wave containment and vibration transmission.
Innovation Solution
A vibration damping assembly that includes mechanical dampers to decouple loudspeaker transducers from building structures, using adjustable arrays of high frequency transducers to optimize soundfield dispersion and fidelity, and a mounting system with flange and clamp dampers to absorb vibrational energy without compromising the integrity of the loudspeaker system or air-tight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a rigid cabinet structure is used to isolate transducer signals, then low frequency energy isolation is improved, but device complexity and weight increase
Solution Approach 1:
The patent extracts the vibration isolation function from a rigid cabinet structure and implements it through separate damping assemblies mounted to the building structure. The damping assembly includes dampers that directly isolate the transducer from the building structure, eliminating the need for a heavy rigid cabinet while maintaining isolation effectiveness.
Solution Approach 2:
The patent introduces a damping assembly as an intermediary between the transducer and the building structure. This damping assembly includes vibration damping elements that act as mediators to isolate low frequency energy transmission, replacing the need for a rigid cabinet structure.
2Reliability
If multiple high frequency transducers are positioned in close proximity, then horizontal off-axis response is improved, but vertical directivity becomes narrow
Solution Approach 1:
The patent arranges multiple high frequency transducers in a circular pattern around the low frequency transducer, transitioning from linear or planar arrangements to a three-dimensional circular configuration. This circular array provides omnidirectional horizontal coverage while maintaining controlled vertical directivity through the vertical stacking of transducers at different heights.
Solution Approach 2:
The patent implements adjustable transducer positioning mechanisms that allow dynamic reconfiguration of the high frequency transducer array. This enables optimization of both horizontal off-axis response and vertical directivity based on installation requirements and listening environments.
3Ease of manufacture
If transducers are mounted directly to building structures, then installation simplicity is improved, but vibration transmission and signal degradation increase
Solution Approach 1:
The patent introduces a damping assembly as an intermediary between the transducer and the building structure. This assembly includes vibration damping elements that isolate the transducer from direct contact with the building structure, reducing vibration transmission while maintaining relatively simple installation procedures.
Solution Approach 2:
The patent divides the mounting system into separate functional components: the transducer, the damping assembly with isolating elements, and the building structure attachment. This segmentation allows the damping function to be added without significantly complicating the overall installation process.
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
Effectively reduces energy transmission and second-order low frequency signal propagation, enhancing sound fidelity and perceived width of sound reproduction by isolating acoustic vibrations and optimizing transducer alignment for improved horizontal and vertical directivity.
Implementation Method 1
A damping assembly can include a clamp damper that extends from the body portion of the mounting frame and is configured to impinge on an inner surface of the loudspeaker mounting surface
Implementation Method 2
mechanical dampers to decouple loudspeaker transducers from building structures
Data Source
AI summary
In an example, a loudspeaker system includes a low frequency first transducer and an array of high frequency transducers overlapping a front face of the low frequency transducer. In an example, the transducer array has an arcuate profile, and an axis of the array is non-coaxial with a central axis of the first transducer.