Acoustic Resistive Element in Ported Transducer Enclosures
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Solution Overview
Problem
Ported transducer enclosures often suffer from undesirable acoustical attributes such as spectral peaks and resonances due to the geometry of the port, which can corrupt the frequency response and output of loudspeakers, especially when the port volume is significant, leading to noise and distortion.
Innovation Solution
Incorporating an acoustic resistive element into the port structure to attenuate these unwanted effects, which can be configured as a single or multiple layers, including fabric or metallic mesh, to reduce the acoustical signature and standing waves within the port, thereby improving the sound quality by dampening resonant tones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a port is incorporated into the enclosure to improve efficiency and sensitivity, then smaller enclosures can be produced with better acoustic performance, but spectral peaks and resonances occur due to port geometry that corrupt frequency response and produce noise
Solution Approach 1:
An acoustic resistive element is introduced as an intermediary component within the port structure. This element acts as a mediator that interacts with the acoustic waves passing through the port, providing acoustic resistance that dampens resonant oscillations and reduces spectral peaks without significantly blocking the acoustic flow, thereby eliminating port-induced noise while maintaining efficiency
Solution Approach 2:
The acoustic resistive element is implemented using porous or mesh-like materials that provide acoustic resistance through their structure. These materials allow acoustic energy to pass through while creating friction and resistance that dampens unwanted resonances and standing waves in the port, reducing spectral peaks and noise generation
2Productivity
If the port volume is increased to improve acoustic output, then more air can pass between interior and exterior, but standing waves and resonant tones are amplified that corrupt the frequency response
Solution Approach 1:
The acoustic resistive element serves as an intermediary that stabilizes the acoustic environment within the port. By providing distributed resistance along the port path, it dampens standing waves and resonant modes that would otherwise be amplified by larger port volumes, thereby maintaining frequency response stability while allowing increased acoustic flow
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 use of acoustic resistive elements effectively reduces the impact of port-induced noise and distortion, enhancing the overall acoustical performance and efficiency of the transducer array by minimizing standing waves and resonances, leading to improved sound quality and beamforming capabilities.
Implementation Method 1
an acoustic resistive element located in the one of the one or more structures, the acoustic resistive element being capable of reducing effects of the acoustic characteristics of the port
Data Source
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AI summary
An apparatus includes an enclosure capable of receiving an array of transducers for converting electrical signals into steered audible signals. The apparatus also includes one or more structures within the enclosure defining a port having one end located within the enclosure and another end that is external to the enclosure. The apparatus also includes an acoustic resistive element located in the one of the one or more structures, the acoustic resistive element being capable of reducing effects of the acoustic characteristics of the port for audible signals being produced by the array of transducers.