Adaptive Flat-Panel Loudspeaker for Acoustic Environment Adaptation
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Solution Overview
Problem
Flat-panel loudspeakers face limitations due to their fixed mechanical properties, leading to inadequate frequency response and resonance issues, which restrict their application in acoustically challenging environments, and existing solutions have not fully addressed these problems.
Innovation Solution
An adaptive noise generating device with a flat-panel loudspeaker incorporating an actuator on a carrier panel with adjustable noise signals, controlled by a device that can analyze ambient noise and adjust emissions based on acoustic conditions, combined with acoustic insulating materials for enhanced sound damping and illumination capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flat-panel loudspeaker uses a fixed material and surface for sound radiation, then the structure is simple and easy to manufacture, but the frequency response is predetermined and cannot be optimized for different acoustic environments
Solution Approach 1:
The patent applies the dynamics principle by making the sound-radiating surface adjustable rather than fixed. The surface can be dynamically reconfigured to change its acoustic properties, allowing the same physical structure to adapt to different frequency response requirements and acoustic environments without requiring multiple different surfaces.
Solution Approach 2:
The patent implements parameter changes by enabling modification of the sound-radiating surface properties such as mass, stiffness, and damping characteristics. These parameters can be adjusted to optimize frequency response for different applications, transforming a static design into a configurable system that adapts to specific acoustic requirements.
2Strength
If a flat-panel loudspeaker uses a rigid surface for sound radiation, then the structural strength is high, but the natural resonances cause excessive low tone reproduction and rattling in the audible range
Solution Approach 1:
The patent applies local quality by allowing different regions of the sound-radiating surface to have different mechanical properties. By configuring local areas with varying stiffness, mass, or damping characteristics, the surface can be optimized to suppress harmful resonances in specific frequency ranges while maintaining overall structural strength where needed.
Solution Approach 2:
The patent utilizes composite materials by combining different material properties in the sound-radiating surface. This allows integration of materials with complementary characteristics - for example, combining rigid materials for structural strength with compliant or damping materials to suppress unwanted resonances and rattling, thereby achieving both strength and acoustic performance.
3Reliability
If a flat-panel loudspeaker uses a show window glass surface, then the material is durable and transparent, but the frequency response is predetermined by the natural resonances of the glass
Solution Approach 1:
The patent applies dynamics by transforming the static glass surface into a dynamically adjustable system. The same durable glass surface can be reconfigured to achieve different frequency responses through adjustable parameters such as mass distribution, stiffness characteristics, or damping properties, allowing adaptability without compromising the durability of the underlying glass structure.
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 adaptive noise generating device effectively dampens disturbing sounds and improves concentration by dynamically adjusting noise emissions to match ambient conditions, offering improved sound quality and flexibility in various acoustic environments.
Implementation Method 1
a moving coil working on the electrodynamic principle is used and it is placed directly on a surface... If the moving coil is electrically excited by a source of sound, its vibrations are transmitted to the surface acting as a diaphragm
Implementation Method 2
acoustic insulating material for enhanced sound damping
Data Source
AI summary
An acoustic adaptive noise generating device in the form of a flat panel loudspeaker is suitable for increasing people's powers of concentration in acoustically difficult surroundings. The adaptive noise generating device includes a carrier panel, an actuator arranged on the carrier panel. A control device is connected to the actuator and permits adjustment of noise signals emitted by the actuator.