However, the designed cymatic diffusers may be constructed on a panel and fins may be disposed on the panel. Each adjacent pair of fins being separated by a common predetermined distance or different predetermined distance. In another embodiment, groves or wells may be formed in the panel. The depths and proportions of the wells are varied and may be determined using a quadratic residue series QRD , a primitive-root series or other series created with a mathematical algorithm or at random, but in one embodiment the QRD series is used to define well depth.
The designed sound diffusers may be constructed of wood, metal, studiofoam, thermoplastic or any other material suitable for sound diffusion, but preferably the material used is wood. Wood can be painted to reduce absorption and increase reflection and vice versa. The designed diffusers have square shapes and the number of wells is determined from cymatic shapes that are determined empirically or by observation from similar shaped plat panels that are excited at particular frequencies with a frequency generator so the resonance patterns emerge on the panel. Once the pattern emerges for that frequency, the different anti-nodes in the resonance pattern identify the well locations and number The depth of the wells are determined by calculation such as by QRDude calculator where well depths are calculated according to eqn 1.
Installation of the diffusors of the present disclosure may take many forms, depending on the design, shape, size and weight of the diffusor, as well as the desired acoustic properties of the space. Some likely installations are by hanging the diffusor from a wall, a ceiling or both, or any suitable installation. Furthermore, different cymatic shapes may be mounted on a single panel to diffuse particular acoustic frequencies, such as one or more of the diffusers 21 - 26 in FIG.
In each of FIGS. The widths of the wells may be of equal values or different values depending on the cymatic shapes used to construct the diffuser. In one embodiment, the diffuser can include any number of wells and can conserve sound on any range of frequency that matches the calculations of eqn. In a particular example, the first diffuser illustrated in FIGS. In one embodiment the second sound diffuser illustrated in FIGS. Different arrangements of the same diffuser can result in different shapes for suppressing different frequency ranges, and can be combined on a single panel to suppress multiple a broader ranges of acoustic frequencies.
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The arrangement of the diffusers gives a variety of architectural designs, and at the same time can be utilized to fulfill special acoustical requirements such as controlling reverberation time. Diffuser 21 in FIG. Diffuser 22 in FIG. Diffusers 23 - 26 in FIG. Generally, the diffusers can be used to improve the speech intelligibility at all frequencies within the usable frequency range Hz, and they work better for speech in settings such as control rooms recording and broadcasting studios , conference rooms and lecture halls. Acoustic performance of the first and second sound diffusers can be evaluated through measuring some acoustic parameters.
Acoustic parameters include but are not limited to reverberation time, clarity, sound strength, spaciousness, timbre or tone color balance between hi, med, low frequencies , sound definition, echo criterion and speech intelligibility. Acoustical requirements of an architectural project may be achieved using diffusors of the present disclosure. For example, the first and second diffusors can be used to improve indoor sound quality by evenly scattering sound in all directions, and reducing coloration and echo control.
The efficiency of the designed diffusers is investigated by testing the diffusivity of the diffusers, and then comparing it with the diffusivity of a flat panel. Diffusivity can be determined by examining the diffuser polar response to study the spatial dispersion in all directions in one-third octave bands. The ideal diffuser should distribute sound energy evenly in all directions, this means that the perfect polar response should look like a semicircle. When using the first and second sound diffusers, the sound energy starts to distribute in a more even way at the usable frequency range Hz , and continues to become more like a semicircle as it gets closer to the design frequency Hz.
This type of diffusers can generate a uniform polar response over the frequency range Hz Hz. The high diffusivity of the diffusers in the usable frequency range Hz reflects a success and effectiveness of the first and second designed diffusers.
DIY QRD Diffuser
Echo criterion EC is a criterion for the perceptibility of sound coloration or of a flutter echo. The value of EC should not exceed 1. In addition, the value of speech starts from 1. In contrast, the value of EC music and EC speech does not exceed the recommended values and it is not affected by the receiver location when using the diffuser. Although FIG. The process then proceeds to step S where a cymatic resonance pattern is excited at particular frequencies by a frequency generator. Then at step S where the anti-nodes of the cymatic resonance pattern are used to determine the number of wells required in the desired diffusor.
Table of contents
At step S , previously discussed eq. The diffusers 27 are made of MDF panels and the panels are painted to maximize reflections and to minimize absorption losses by closing pores. The system requires a PC 30 , an impulsive sound source 31 , a microphone 28 and a sound device 29 that connects the sound source 31 and the microphone 28 with the PC To run the software, the receiver microphone 28 is connected to the input channel, and the sound source speaker 31 is connected to the output channel of the sound device 29 USB Audio Interface ZE This device is connected to the laptop as a USB device.
The first and last two angles were neglected in order to avoid the reflection of the diffusers' edges. Next, a hardware description of the processing circuitry according to exemplary embodiments is described with reference to FIG. In FIG. The process data and instructions may be stored in memory These processes and instructions may also be stored on a storage medium disk such as a hard drive HDD or portable storage medium or may be stored remotely.
Further, the claimed advancements are not limited by the form of the computer-readable media on which the instructions of the inventive process are stored. CPU may be a Xenon or Core processor from Intel of America or an Opteron processor from AMD of America, or may be other processor types that would be recognized by one of ordinary skill in the art. Further, CPU may be implemented as multiple processors cooperatively working in parallel to perform the instructions of the inventive processes described above. The processing circuitry in FIG.
The network can also be wired, such as an Ethernet network, or can be wireless such as a cellular network including EDGE, 3G and 4G wireless cellular systems.
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The wireless network can also be WiFi, Bluetooth, or any other wireless form of communication that is known. Thus, the foregoing discussion discloses and describes merely exemplary embodiments of the present invention. As will be understood by those skilled in the art, the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
Accordingly, the disclosure of the present invention is intended to be illustrative, but not limiting of the scope of the invention, as well as other claims. The disclosures, including any readily discernible variants of the teachings herein, define, in part, the scope of the foregoing claim terminology such that no inventive subject matter is dedicated to the public. USB2 en. Sound-absorbing device for a wall covering, ceiling covering, or floor covering. Old , PM - Thread Starter. Perry R. Why not make your Skyline out of styrofoam?
Half the work, and instead of having to "Bolt" it on the wall or ceiling you can use simple scews due to the weight differences. I've built big 1D QRD out of styrofoam with great success.
Placed it on the front wall, I run Dipole speakers. Next will be some skylines for the rear of the room. Should be able to see it in my avatar. Perry R is offline.
I was under the impression Styrofoam had problems diffusing all the targeted frequencies. Wood is much more reflective. Make your diffusers with wood like mine:.
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- Acoustic Absorbers and Diffusers | Theory, Design and Application | Taylor & Francis Group;
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Absorbers often help the effects of diffusers be more audible. BllDo likes this. Lonely Raven. Lonely Raven is offline. BB code is On.
skyline diffuser calculation - diyAudio