Quadratic diffuser placement home theater
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QRD Technical Reference
Diffusion , in architectural acoustics , is the spreading of sound energy evenly in a given environment. A perfectly diffusive sound space is one in which the reverberation time is the same at any listening position. Most interior spaces are non-diffusive; the reverberation time is considerably different around the room. At low frequencies, they suffer from prominent resonances called room modes. Diffusors or diffusers are used to treat sound aberrations, such as echoes, in rooms.
They are an excellent alternative or complement to sound absorption because they do not remove sound energy, but can be used to effectively reduce distinct echoes and reflections while still leaving a live sounding space. Compared to a reflective surface, which will cause most of the energy to be reflected off at an angle equal to the angle of incidence, a diffusor will cause the sound energy to be radiated in many directions, hence leading to a more diffusive acoustic space.
It is also important that a diffusor spreads reflections in time as well as spatially. Diffusors can aid sound diffusion, but this is not why they are used in many cases; they are more often used to remove coloration and echoes. Diffusors come in many shapes and materials. The birth of modern diffusors was marked by Manfred R. Schroeders ' invention of number-theoretic diffusors in the s. Maximum length sequence based diffusors are made of strips of material with two different depths.
The placement of these strips follows an MLS. The width of the strips is smaller than or equal to half the wavelength of the frequency where the maximum scattering effect is desired. Ideally, small vertical walls are placed between lower strips, improving the scattering effect in the case of tangential sound incidence. The bandwidth of these devices is rather limited; at one octave above the design frequency, diffusor efficiency drops to that of a flat surface.
MLS based diffusors are superior to geometrical diffusors in many respects; they have limited bandwidth. The new goal was to find a new surface geometry that would combine the excellent diffusion characteristics of MLS designs with wider bandwidth. A new design was discovered, called a quadratic residue diffusor.
Quadratic-Residue Diffusors can be designed to diffuse sound in either one or two directions. Primitive-root diffusors are based on a number theoretic sequence based on primitive roots.
Although they produce a notch in the scattering response, in reality the notch is over too narrow a bandwidth to be useful. In terms of performance, they are very similar to Quadratic-Residue Diffusors.
By using numerical optimisation, it is possible to increase the number of theoretical designs, especially for diffusors with a small number of wells per period. But the big advantage of optimisation is that arbitrary shapes can be used which can blend better with architectural forms.
Designed, like most diffusors, to create "a big sound in a small room," unlike other diffusors, two-dimensional diffusors scatter sound in a hemispherical pattern. This is done by the creation of a grid, whose cavities have wells of varying depth, according to the matrix addition of two quadratic sequences equal or proportionate to those of a regular diffusor.
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December Click [show] for important translation instructions. View a machine-translated version of the German article. Machine translation like DeepL or Google Translate is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article.
You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. For more guidance, see Wikipedia:Translation. Schroeder April Bibcode : ASAJ The Journal of the Acoustical Society of America. BBC Research Department.
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The Acoustics of Large vs Small Rooms
LX - Store. Conversations with Fitz. The Magic in 2-Channel Sound. Issues in speaker design. Amplifiers etc.
Quadratic Diffusion in our rooms
The single-most important factor in achieving optimum sound quality in any given room is system layout. Get this right and you may find you've no need for room acoustic treatments at all. And if it transpires that you do need or want them, their task will be eased. It bears repeating ad infinitum that good room layout is a matter of sender and receiver. You don't achieve the best results by changing speaker position or listening position alone: the two interact and must be considered and adjusted together, — within the practical constraints imposed by domestic realities. What's absolutely essential is to place loudspeakers symmetrically, so that they have the same immediate acoustic environment — the same spacings to the floor, front wall and near side wall. In a rectangular or near-rectangular room this is easy to achieve; in some other shapes of room it isn't.
Защита от шума и вибраций
LOG IN. I saw this quote about room treatments in another forum where one audiophile is advising another audiophile: Diffusion is what you need. It cures the "empty room" feeling of specular reflections without the stuffy dead feeling of absorbtion. It makes the space feel bigger than it really is.
Audiophile
With flat hard-surface walls and ceilings now all the craze, people are coming to realize that these high-fidelity spaces are feeling a little, well, echo-y. The solution to this, of course, is to incorporate acoustical treatments and sound absorption for office design. In order to get the best result, you must first understand that there are two types of acoustic room treatments — absorbers and diffusers — that can help alleviate echo and reverberation in studios or theaters. Combining office sound absorption and diffusion solutions results in clearer, more satisfying acoustic experiences because it maintains an amount of reverberant ambience that is key to our ability to form accurate sound images. The most important factor for room acoustics is finding the best balance of absorption, diffusion, and placement that will improve the unique acoustic properties of a particular space.
Diffusion is a Wonderful Tool – by Jeff Hedback
However, while I was busy espousing the benefits of soft materials for sound absorption, I neglected to investigate another important soundproofing concept: sound diffusion. Before I can go into the details, we should establish a working definition of sound diffusion. But first, we have to understand how sound waves behave. Still, artificial sources such as speakers are able to direct the waves. Conversely, some objects can act as obstacles and avert or reflect them. In open space environments, sound waves keep spreading until they naturally dissipate.
the t.akustik SC Diffusor review: specs & price
Acoustical treatments involve only two types of acoustic panels: absorbers and diffusers. Absorbers serve to soak up some of the excess reflected sound in a room. Diffusers, on the other hand, help to spread out the reflections in a room. Combining absorption and diffusion results in clearer, crisper, more satisfying acoustic experiences because it maintains some of the reverberation that is key to our ability to form accurate sound images.
Never has there been more interest in the area of high fidelity audio. Long play albums have become cool again and audiophiles are spending more on their 2-channel setups than ever before. But no matter how much you spend on a new needle, cables, preamp, or amplifier, the improvement will only be incremental until you have addressed the room acoustics. Most dedicated listening rooms are spare bedrooms or converted basements with hard gypsum walls that echo energy back into the room in the form of powerful first-order reflections and secondary ones known as flutter echo. These reflections blur or muddy the information making it more difficult to hear the recording as it was mixed or identify individual instruments.
Click the photos below to see them full size. Nulls as deep as 30 dB are not only common, but typical. This is known colloquially as time smearing. That's just another Internet myth. Most audio devices sold these days have quality ranging from very good to excellent, and can pass music and movie sound tracks with minimal coloration. Yet many hi-fi and home theater enthusiasts, unhappy with what they hear, wrongly blame their gear. The important metrics for audio fidelity are frequency response, distortion, and noise.
Jeffrey Powers acoustic panel , acoustic panel placement , acoustic panels , acoustic treatment , acoustic treatment for recording , acoustic treatment for vocals , acoustic treatment home theater , designer sound panels , infocomm , jeffrey powers , music studio , music studio setup , room acoustic , room acoustics , sound isolation , sound isolation booth , sound isolation room , Technology , technology , vicoustic flatpanel vmt 0. What if your sound panels held a design? Designer sound panels and sound rooms are what ViCoustic does. These panels are thin, and can reduce the sound of a room.
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