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Topic: Absorption (acoustics)

	Absorption (Site not responding. Last check: 2007-10-10)
		In physics absorption is a process in which particles of some sort encounter another material and are taken up by or even disappear in it.
		Volume absorption of particles of gas or liquid in liquid or solid material is studied in chemistry.
		In acoustics absorption refers to the absorption of sound waves by a material.
	hallencyclopedia.com /Absorption (358 words)

	Absorption - Wikipedia, the free encyclopedia
		absorption (chemistry) - absorption of particles of gas or liquid in liquid or solid material as studied in physical chemistry
		Absorption (economics) refers to the total demand of an economy for goods and services both from within and without the economy
		Absorption should not be confused with adsorption, the formation of a liquid or gas film on a solid surface.
	en.wikipedia.org /wiki/Absorb (175 words)

	TSC \| RT60 Calculator
		Acoustics is something we all have to deal with in audio.
		In 1922 a pioneer in the study of room acoustics, Wallace Sabine came up with the formula which is used here by this calculator.
		It is a sum of all the surface areas in the room multiplied by their respective absorption coefficients.
	www.trinitysoundcompany.com /rt60.html (198 words)

	Room Acoustics
		This absorption mechanism may be an important issue during the design of naturally ventilated large spaces, where the acoustical performance is of critical concern.
		The equivalent absorption due the enclosed air can be expressed (see for instance [6]) by 4 m V, where m is the air absorption coefficient [m-1] and V is the volume of the enclosure [m³].
		Finally, the air absorption contribution is included according to the temperature and humidity obtained by the thermal simulation.
	www.esru.strath.ac.uk /Courseware/Acoustic/aco.htm (2273 words)

	Functions - Acoustics - Sound absorption
		Increasing the absorption within the room will generally reduce the noise level, in practice by approximately 3 to 10 dB.
		To achieve an audible improvement the absorption within a room has to be increased by a factor of 2.
		Therefore, an increase of the absorption of the ceiling from 20% to 40% or from 40% to 80% is advisable, an increase from 70% to 80 % will show very little, if any, noticeable improvement.
	www.owa.de /english/func_aku_absorp.html (295 words)

	illbruck
		illbruck's acoustical and noise control products can be configured for effective solutions in virtually any setting - from recording studios and offices to classrooms and gymnasiums to industrial assembly lines.
		Whether it is reverberation control in indoor pools, or sound absorption for improved speech intelligibility, in areas large or small, illbruck's wall panels, ceiling tiles, baffles and noise barrier composites deliver excellent performance characteristics.
		Acoustical and design solutions for architects and interior designers.
	www.illbruck-sonex.com (152 words)

	The University of Sheffield: Acoustics Group/publications (Site not responding. Last check: 2007-10-10)
		Kang, J. and Fuchs, H. (1999) "Effect of water-films on the absorption of membrane absorbers".
		Chourmouziadou, K. and Kang, J. "Acoustic evolution of ancient theatres and the effects of scenery: A case study of the theatre of Mieza".
		Joint Meeting of the 137th Regular Meeting of the Acoustical Society of America, the 2nd Convention of the European Acoustics Association (EAA) (Forum Acusticum), and the 25th German Acoustics DAGA Conference, Berlin, Germany.
	www.shef.ac.uk /acoustics/html/publications.html (2774 words)

	Calcium Carbonate Absorption (Site not responding. Last check: 2007-10-10)
		In physics absorption is a process in which particles of some sort encounter another materialand are taken up by or even disappear in it.
		In optics absorption refers to the absorption of photons by amaterial.
		In acoustics absorption refersto the absorption of sound waves by a material.
	www.swingdancemusic.com /send/48736-calcium%20carbonate%20absorption.html (94 words)

	Sound Quality Terms and Definitions
		Average room absorption coefficient: Total room absorption in sabins or metric sabins, divided by total room surface area in consistent units of square feet or square meters.
		Receiving room: In architectural acoustical measurements, the room in which the sound transmitted from the source room is measured.
		Sound absorption coefficient, : [dimensionless]; metric sabin/m ---of a surface, in a specified frequency band, the measure of the absorptive property of a material as approximated by the method of Test Method C423.
	www.owenscorning.com /around/sound/definitions.html (6963 words)

	UT Acoustics: Courses
		Acoustics I. Plane waves in fluids; transient and steady-state reflection and transmission; lumped elements; refraction; strings, membranes, and rooms; horns; ray acoustics; absorption and dispersion.
		Electrical, mechanical, and acoustical dynamics; principles of energy conversion, transducer laws, and representation; effects of the transducer characteristics on accuracy and efficiency of energy transformation.
		Acoustical properties of the ocean; point sources and Green's functions; reflection phenomena; ray theory; normal mode theory; guided waves in horizontally stratified fluid media; WKB and parabolic approximations.
	www.me.utexas.edu /~acoustic/course.htm (323 words)

	Sound Quality Glossary Terms
		Acoustic impedance: Z=R+jX ; [ML-4T-1] ; mks acoustic ohm *(Pa•s/m3) ---of a surface, for a given frequency, the complex quotient obtained when the sound pressure averaged over the surface is divided by the volume velocity through the surface.
		It is a pure specific resistance since the sound pressure and the particle velocity are in phase and it is equal in magnitude to the product of the density of the medium, p, and the speed of sound in the medium, c.
		Sound absorption is often involved as, for instance, in a lined duct.
	www.owenscorning.com /around/sound/glossary.asp (7146 words)

	Campanella Associates (Acoustics Consultants) - Sound Advice on Sound Absorption (Site not responding. Last check: 2007-10-10)
		Interior design of any acoustical space be it an auditorium, studio, meeting room or office needs special attention.
		Acoustical ceiling tile is usually adequate for non-critical spaces such as offices.
		For critical spaces such as large meeting rooms, dining areas, auditoriums, or teleconferencing rooms, sound absorption area and location are adjusted to achieve the reverberation time that suits the room use (speech, music,etc.).
	www.campanellaacoustics.com /absorpti.htm (293 words)

	Acoustics :: View topic - Measuring Sabine Absorption values (Site not responding. Last check: 2007-10-10)
		Using a reverberation chamber, the sound absorption is computed as the difference of the Sabine absorption with and without the object under test present in the reverberation chamber.
		The apparent boost in sound absorption coefficient that comes about due to wave diffraction at the edges of the specimen.
		The specimen appears to be larger than its plan area by a perimeter stripe with width proportional to lambda, where aS is the sound absorption coefficient that would result from testing an infinite area.
	forum.studiotips.com /viewtopic.php?p=16657 (305 words)

	AbcSoundlab®, acoustic, acoustic panels, sound proofing, acoustic sound control, acoustic sound panel, noise control ...
		The series of Harmonium 1 acoustical panels is a highly efficient absorbing system that is also characterized by a high diffraction value within higher frequencies.
		The series of Harmonium 4 systems, wide-band traps, is a classic in the field of rooms acoustic adaptation that has a high absorption value (coefficient) in a range of low frequencies of the acoustic band.
		Each needs an individual design preceded by a thorough analysis of a given rooms acoustic atmosphere, on the basis of advanced computer simulation, and as a consequence it is to be adequately tuned to the room.
	www.abcsoundlab.com /abc_en_products.htm (1003 words)

	Absorption - Encyclopedia, History, Geography and Biography
		Volume absorption of particles of gas or liquid in liquid or solid material is studied in physical chemistry.
		This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title.
		This page was last modified 05:59, 27 May 2005.
	www.arikah.com /encyclopedia/Absorption (189 words)

	Building Acoustics, Insulation and Absorption
		Acoustical Solutions offers sound control and noise reduction products in the areas of industrial noise control, broadcast and recording, architectural acoustics, and teleconferencing and distance learning.
		Acoustical Surfaces Inc. offers the widest range of acoustical and noise control products, serving the architectural, industrial, pro-audio and educational markets.
		Acoustical consultants that manufacture and design industrial noise solution systems - acoustical enclosures, silencers, acoustical barriers and louvres.
	www.nonoise.org /products/building_acoustics_insulation_and_absorption/index.htm (338 words)

	Room Acoustics Modelling (Site not responding. Last check: 2007-10-10)
		The goal of this project is to understand how to model the acoustics of a room using DSP methods given such parameters as: room size, room composition, room shape, and the location of the sound source and listener.
		Probably the most obvious and easiest implementation is the brute force method of applying the transfer function (h(t)), also known as the impulse response, directly to the input signal via a convolution.
		Where V is the volume of the room in cubic meters and A is the room's imaginary 'absorption window' (in square meters) which is calculated by a sum of the surface areas of the room times its corresponding absorption coefficient.
	pcfarina.eng.unipr.it /Aurora/SAW/RoomSim.html (1567 words)

	CDe Acoustics - CDe Group (Site not responding. Last check: 2007-10-10)
		This may be easily and effectively countered with the application of custom-designed acoustic panelling produced by our team.
		CDe Acoustic panels were fitted in the dining area of Melbourneâs Pier Hotel.
		RMIT Technical Officer John Watson later commented âWhen CDe Acoustics absorption panels were installed onto the ceiling, the subjective difference in the liveliness of the space was immediate and obvious to the listener.â
	www.cdegroup.com /acoustics (149 words)

	Primacoustic - Acoustical Solutions
		Primacoustic’s panels are made of high-density, open-cell urethane acoustic foam for maximum absorption.
		Since studio acoustics is more than deadening a room with foam, the Primacoustic product line also includes rigid diffusers and portable studio GOBOs.
		Not only was this 'magical' place outfitted with high quality recording equipment, the rooms were acoustically treated in such a way as to produce great sound.
	www.primacoustic.com /indexstudio.htm (339 words)

	NPL Acoustics: Calculation of absorption of sound by the atmosphere
		ISO 9613 Part 1 describes the calculation method for absorption of sound by the atmosphere.
		validation data taken from Table 1 of ISO 9613-1, and calculate attenuation due to atmospheric absorption at a distance.
		According to ISO 9613-1 the accuracy of the calculated pure-tone attenuation coefficients for atmospheric absorption is estimated using the following table:
	www.npl.co.uk /acoustics/techguides/absorption (234 words)

	Architectural Acoustics (Site not responding. Last check: 2007-10-10)
		Some of the world-class acoustics consultants with which we've had the privilege to work rely on Egan to help communicate complex ideas.
		Without compromising too much real technical nuance, the ideas are so clearly communicated that I was able to offer the book to members of a church in eastern Europe working to improve the condition of their worship space.
		It brings detailed info for designing places with good acoustic performance whit various technics and for the most different type of places like a simple residential to auditoriums and concert rooms.
	www.findtutorials.com /shop/0070191115/Architectural_Acoustics.html (488 words)

	Auralex Acoustics - Acoustic Product Performance Data
		You can judge a foam's absorptive effectiveness by studying its NRC (Noise Reduction Coefficient), a single number average of a foam's absorption in what was determined long ago to be the most important range.
		All of our foam products are tested at an independent, unbiased acoustical laboratory - the oldest, most reliable lab in the country.
		The object of diffusion is to redistribute mid and high frequency sound evenly throughout a space, not to absorb it, so you want a diffusor whose arcs at the various frequencies: (a) are very smooth, and (b) all show basically the same shape, which indicates the unit is providing uniform diffusion at all frequencies.
	www.auralex.com /testdata (303 words)

	Absorption coefficients for suspended ceilings
		To main > Properties > Acoustics > Absorption coefficients for suspended ceilings
		Sound absorption coefficients for spended ceilings for suspended ceilings at 200 mm suspension.
		Absorption coefficients for panel ceilingsSound reduction - gypsum absorbs sound
	danoline-uk.com /properties/acoustics/acoustics_2.html (70 words)

	BEST MUSIC BOOKS - Sound and Acoustics Section. (Site not responding. Last check: 2007-10-10)
		Complete coverage of the science of acoustics and the art of acoustic techniques including room resonances, reflection analysis, comb filters, and the design of audio/video rooms for almost any purpose on acoustical concepts and terminology.
		Presents an introduction to theoretical acoustics and acoustic signal processing for upper level undergraduate students with some familiarity with elementary mathematics related to Fourier and Laplace transforms, complex analysis, and linear algebra.
		The volume draws somewhat on the 1971 Noise and vibration control, edited by one of the present authors, but entirely new are chapters on the control of noise by active devices, and the quieting of internal combustion engines, electrical machinery, and gears.
	www.indiebible.com /books/xacoustics.shtml (1000 words)

	[No title]
		Absorption for room design (Powerpoint presentation I used, password protected, 1.8MB)
		Room acoustics: The paper is 3 hours long.
		You will chose three questions from five (so the questions are long).
	www.acoustics.salford.ac.uk /student_area/bsc3/room_acoustics/index.htm (370 words)

	Architectural Acoustics ~. Find Discount, cheap deals for Architectural Acoustics : Cheapest Prices (Site not responding. Last check: 2007-10-10)
		I have other acoustics books (like William Cavanaugh's) and they always make mention to David Egan's book.
		If you're in search on books about architectural acoustics, I think that must be the first one to buy.
		It is clear, concise, and an excellent resource for design professionals and others interested in workable acoustical applications.
	www.jpconnection.com /0070191115/Architectural_Acoustics.html (498 words)

	[No title] (Site not responding. Last check: 2007-10-10)
		Background: The sound absorption coefficient of material samples is presently determined by means of a standing wave, or impedance tube.
		A procedure has been developed at the Acoustics Laboratory to obtain a continuous spectrum of the absorption coefficient during a single measurement using discrete laboratory equipment.
		Objective: Develop a DSP based system that will automatically measure and display the sound absorption coefficient of a material as a function of frequency.
	local.eleceng.uct.ac.za /eee458s/2000/lists/AWJ03.html (123 words)

	Symposium Acoustics:Reviews
		With the 'table stopped and the stylus in the groove, a sharp tap on the motor or Flyweel's surface- which had produced a warm thunk through the speakers when the TNT rested on the Big Foot- now yielded a barely audible pop on the Symposium platform.
		Symposium Acoustics' Ultra Platform and Rollerblock system is a rather ingenious and unorthodox approach to vibration isolation.
		"Rollerblocks by Symposium Acoustics, (973) 616-4787, are component damping and isolation devices that are used in the same way as feet or cones, but with a pivotal (tee hee) difference: Rollerblocks are engineered to dissipate lateral motion as well.
	www.symposiumusa.com /reviews.shtml (2687 words)

	The Listening Room, Your Most Important Component by David Smith, President And Chief Engineer For Snell Acoustics
		Different than absorption, but equally desirable, is the scattering of sound.
		So the two main components determining room acoustics are absorption and scattering diffusion.
		I hope I have given you some insight into what room acoustics are about, what you can do to improve yours and how that will improve any listening experience.
	www.enjoythemusic.com /magazine/manufacture/0502 (1482 words)

	Crutchfield Advisor - Speakers - Room Acoustics
		If you feel that the way your room interacts with your speakers is causing problems, it's time to turn to Science; the science of acoustics, or more specifically, room acoustics.
		As we talk about room acoustics problems and room treatment solutions, the three main concepts we'll keep coming back to are Reflection, Absorption and Diffusion.
		But the first step is understanding the basic concepts of room acoustics and the part they play in your everyday listening.
	www.crutchfieldadvisor.com /ISEO-rajtcspd/learningcenter/home/speakers_roomacoustics.html (716 words)

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