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Topic: Diaphragm (acoustics)

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	Diaphragm - Wikipedia, the free encyclopedia
		Urogenital diaphragm, a layer of the pelvis separating deep perineal sac from the upper pelvis
		Diaphragm (optics), a stop in the light path of a lens, having an aperture that regulates the amount of light that passes
		Diaphragm (acoustics), a thin, semi-rigid membrane that vibrates to produce or transmit sound waves
	en.wikipedia.org /wiki/Diaphragm (227 words)

	Encyclopedia :: encyclopedia : Acoustics (Site not responding. Last check: 2007-11-02)
		Biomedical acoustics is the study of the use of sound in medicine, for example the use of ultrasound for diagnostic and therapeutic purposes.
		Physical acoustics is the study of the detailed interaction of sound with materials and fluids and includes, for example, sonoluminescence (the emission of light by bubbles in a liquid excited by sound) and thermoacoustics (the interaction of sound and heat).
		Acoustic engineering is the study of how sound is generated and measured by loudspeakers, microphones, sonar projectors, hydrophones, ultrasonic transducers, sensors, Electro Acoustics, and all other topics on this list.
	www.hallencyclopedia.com /Acoustics (1181 words)

	Class Definition for Class 181 - ACOUSTICS
		The diaphragms are usually aligned on a common axis, and may be surrounded by walls to form an airtight compartment.
		Subject matter for (1) deviation of the direction of an acoustical wave, (2) blocking of an acoustical wave, or (3) the modification of the character or property of an acoustical wave.
		Subject matter wherein a structure is placed in front of an acoustic wave device having an aperture which inserts a phase delay over the cross section of the aperture so as to effect a convergence or divergence of acoustic waves from the acoustic wave device.
	www.uspto.gov /go/classification/uspc181/defs181.htm (3014 words)

	Class 181: ACOUSTICS / U.S. Patent Classification Definitions
		Subject matter wherein the enclosure is specially designed to confine an acoustic wave emitting device, which device does not form an element of this class type or is not claimed in combination with the subject matter of another class.
		Subject matter having acoustic wave attenuating material positioned within the fluid conducting device to be contacted by the exhaust fluid as by surrounding the through passage or being positioned adjacent to and communicating with the exhaust fluids.
		Subject matter having acoustic wave attenuating material positioned to be contacted by the moving fluid, as by surrounding or being positioned adjacent to and communicating with the fluid passage.
	www.uspto.gov /web/offices/ac/ido/oeip/taf/def/181.htm (7817 words)

	Acoustics Summary - Acoustics Information
		When the diaphragm vibrates under the action of a sound wave, the current in the circuit varies due to the varying capacitance of the condenser.
		Thus, the field of acoustics covers a vast array of different areas of use, and they are constantly expanding.
		Acoustics in the communications industry, in various phases of the construction industries, in oil field exploration, in medicine, in the military, and in the entertainment industry, all attest to the growth of this field and to its continuing importance in the future.
	www.bookrags.com /sciences/physics/acoustics-wop.html (2978 words)

	Category:Acoustics - Wikipedia, the free encyclopedia
		Acoustics is a branch of physics and is study of sound, mechanical waves in gases, liquids, and solids.
		The main article for this category is Acoustics.
		There are 1 subcategories shown below (more may be shown on subsequent pages).
	en.wikipedia.org /wiki/Category:Acoustics (81 words)

	Knowles Acoustics - FAQs - Silicon Microphone (Site not responding. Last check: 2007-11-02)
		The diaphragm in most microphones is a thin, circular membrane held in tension and clamped at the edge.
		Between the diaphragm and the backplate are insulated spacer bumps that set the gap.
		Because the diaphragm is a free-plate, it has no edge moments and has no tension; therefore it has higher compliance than an equivalent clamped diaphragm.
	www.knowlesacoustics.com /html/silicon_faqs.html (1156 words)

	SIGMA MEDICAL
		Excellent acoustic seal and comfortable fit with patented 3M Littmann Snap Tight Soft-Sealing eartips.
		Outstanding acoustics and superior versatility are combined in the technology of the 3M™ Littmann™ Cardiology III Stethoscope.
		Outstanding acoustics are combined with a unique and easy to grasp chestpiece that allows comfortable movement between auscultation sites.
	www.sigmamed.gr /littmann.php (954 words)

	Moulton Lectures
		The first thing to consider is that the diaphragm is housed in a structure, which in this case is given a front to back path length d, we may also refer to this as the depth of the microphone.
		The effect of the Spherical wave on the diaphragm will be considered as the wave front passes from the front face of the housing structure, designated x=0, through to the back face designated x=d.
		With this type of exposed diaphragm the noise cancelling performance reduces with increasing frequency as a first order slope, until a point is reached where the response has no discrimination.
	www.moultonworld.pwp.blueyonder.co.uk /Lecture31_page.htm (1660 words)

	Synthesizer - Wikipedia, the free encyclopedia
		Subtractive synthesizers use a simple acoustic model that assumes an instrument can be approximated by a simple signal generator (producing sawtooth waves, square waves, etc...) followed by a filter which represents the frequency-dependent losses and resonances in the instrument body.
		All organs (including acoustic) are based on the principle of additive or Fourier Synthesis: Several sine tones are mixed to form a more complex waveform.
		Although physical modeling was not a new concept in acoustics and synthesis, it wasn't until the development of the Karplus-Strong algorithm, the subsequent refinement and generalization of the algorithm into digital waveguide synthesis by Julius O. Smith III and others, and the increase in DSP power in the late 1980s that commercial implementations became feasible.
	en.wikipedia.org /wiki/Synthesizer (5390 words)

	Stealth Acoustics F8 Invisible Speaker (Site not responding. Last check: 2007-11-02)
		The Stealth Acoustics model F8 is the newest addition to the F-series flat-panel invisible speakers for in-wall or in-ceiling use.
		The paintable active diaphragm face is a structurally modified three layer composite consisting of two layers of graphics grade paper with a foam core.
		The diaphragm is bonded to the frame creating an active area surrounded by the stable mounting area.
	www.audioholics.com /cedia/cedia2004/StealthAcousticsF8speaker.php (750 words)

	Java Jive [ a recording studio ] - A r t i c l e s
		They are both large diaphragm mics – one is a mic from Taylor Hohendahl Engineering, or THE, with a large 26mm diaphragm capsule, and the other is Shure’s KSM44, a most excellent value and a fine sounding, transparent large diaphragm mic.
		I tend to use one of two setups on acoustic – one is a straight XY configuration, with the mics about 2 feet in front of the guitar, centered about two inches to the right (as you look at the guitar) of the sound hole.
		About 60% of the time, I end up doubling the acoustic – that is, I’ll have two acoustic guitars playing more or less the same thing (though one may be capoed in a different position to change the sound a little).
	www.javajivestudio.com /article09.php (2512 words)

	Littmann Cardiology S.T.C Soft Touch Chestpiece
		Advantages of Using a Tunable Diaphragm When using a stethoscope with a tunable diaphragm, the user does not have to remove the chestpiece from the patient in order to change from the bell to diaphragm mode.
		When listening to low frequency sounds with a tunable diaphragm as opposed to a bell, there will be an increase in amplitude, or loudness.
		This is because the sound is coming through a diaphragm with a larger surface area, as opposed to the smaller opening on a standard bell.
	www.stethoscopes4u.com /licassotoch.html (329 words)

	MEMS microphones dominate new cellphone designs: News from Knowles Acoustics
		In the case of a microphone, a back plate and diaphragm are built on the surface of a wafer along with the necessary electrical connections.
		Since the acoustic path length from the outside world to the microphone must be kept as short as possible to maintain optimum performance, the microphone must be on the front of the PCB near the acoustic hole in the case.
		A short, elegant acoustic path like this allows speech to travel through the phone case, gasket, and PCB and directly into the microphone, while allowing the microphone to reside on the back side of the PCB with the other components.
	www.electronicstalk.com /news/kow/kow108.html (1107 words)

	Medical Genesis - Product Listing - Stethoscopes (Site not responding. Last check: 2007-11-02)
		Its dual frequency diaphragm combines low-frequency and high-frequency modes in the convenience of a single-side chest piece of a traditional two-side chest piece design.
		The tunable diaphragm assures acoustic sensitivity and conveniently alternates between high and low-frequency sounds.
		The Select diaphragm is designed to pick up low frequency sounds, such as S3,S4 and those made by blood pressure, when using light pressure.
	www.medicalgenesis.com /cgi-bin/store/commerce.cgi?product=Stethoscopes (660 words)

	Acoustics FAQ
		In acoustics the decibel is most often used to compare sound pressure, in air, with a reference pressure.
		Structural acoustics is concerned with the coupled dynamic response of elastic structures in contact with non-flowing fluids.
		Structural acoustics problems of interest involving water include the vibration of submerged structures, acoustic radiation from mechanically-excited, submerged, elastic structures; acoustic scattering from submerged, elastic structures (e.g., sonar echoes); acoustic cavity analysis; and dynamics of fluid-filled elastic piping systems.
	www.faqs.org /faqs/physics-faq/acoustics (6493 words)

	Symposium Acoustics: Technology
		Of course, the reason for a light core in the speaker diaphragm is to preserve a low mass diaphragm and reduce moving mass (perhaps the most important parameter in an accurate speaker driver); since the Svelte Shelf is not a speaker, the need for low mass isn't specifically necessary.
		As we saw with cones, part of their effectiveness is realized by interfacing the component with less area of the support surface and therefore reducing the amount of spurious vibration that can enter the component through the cone support; another way to achieve this goal is to ensure that the surface isn't vibrating too much.
		In a loudspeaker diaphragm, this is called diaphragm "break up;" the same principle is at work in an equipment support shelf.
	www.symposiumusa.com /tech3.html (1222 words)

	Tunable Diaphragm Technology (Site not responding. Last check: 2007-11-02)
		Its dual frequency diaphragm combines both bell (low-frequency) and diaphragm (high-frequency) into a single side of the chestpiece.
		The diaphragm membrane is contained by a flexible surround that actually suspends it, allowing the membrane to resonate low-frequency sounds.
		By pressing on the chestpiece, the diaphragm membrane moves inward until it reaches an internal ring.
	www.littmannstethoscopes.com /news/tunable.html (229 words)

	Littman Stethoscope - Buy Stethoscope - Sell Stethoscope (Site not responding. Last check: 2007-11-02)
		The excellent acoustic sensitivity of a tunable diaphragm is the hallmark of the low-profile Littmann Master Classic II stethoscope.
		One particular innovation is that the stethoscope carries a large side of the diaphragm and a small side diaphragm.
		The large side of the diaphragm is for adults and the small side is specially designed for sound with pediatric patients or extremely thin adult patients.
	www.medmarketplace.com /littmann-stethoscope.asp (1460 words)

	Physics News Update
		A tiny microphone diaphragm based on fly ears has been built by researchers (Ronald Miles, Binghamton University, 607-777-4038, miles@binghamton.edu), offering such possibilities as compact hearing aids that respond only to sound in front of the wearer.
		The diaphragm is the part of a microphone that vibrates in response to incoming sound waves; other components then convert the diaphragm's vibrations into electrical signals which can then be amplified or recorded.
		The researchers built a silicon nitride prototype microphone diaphragm that closely reproduces the characteristics of the fly ears.
	www.aip.org /enews/physnews/2001/split/570-3.html (338 words)

	Littmann Select Stethoscope - 28 in. The 3Mâ¢ Littmannâ¢ Select Stethoscope provides good response in both ...
		Its reliable and clear acoustics offer an advantage to health care professionals.
		The patented tunable diaphragm allows you to listen selectively to low or high frequencies without having to turn over the chestpiece.
		You control bell and diaphragm modes by pressure on the chestpiece rather than turning it over.
	www.allegromedical.com /products/shop-by-category/diagnostic-products/3m/175953.html (334 words)

	Review of Acoustics (Site not responding. Last check: 2007-11-02)
		It is difficult to measure displacement but the motion of the particles leads to regions of increased pressure (condensation) and decreased pressure (rarefaction) and we can measure this pressure using a microphone, which consists of a moveable diaphragm.
		When the pressure is greater than usual (condensation) the diaphragm is pushed in.
		The diaphragm is tied to an electrical circuit so that when the diaphragm is pushed in more current flows and when it is pulled out less current flows.
	web.ics.purdue.edu /~longg/Acoustics.html (1676 words)

	AKG Condenser Mic Use
		A large diaphragm; made of conductive mylar, acts in the same way that a drum's head does when hit: it resonates.
		An individual acoustic side effect specific only to AKG large diaphragms is the slight dip of 1.5dB at about 2 to 2.5kHz.
		AKG Acoustics microphones and headphones are manufactured in Vienna, Austria.
	www.barryrudolph.com /greg/akgcondenser.html (1019 words)

	Studio Rec - Broadcast - TV
		Its low-mass diaphragm is custom-engineered for extended frequency response and superior transient response....
		The C-2 microphone utilize a low-mass diaphragm for ultra-wide frequency response and ultimate sound reproduction and their inconspicuous size makes them perfect for acoustic instruments, overhead applications, pianos and similar.
		The B-5 Behringer Condenser Microphone is a professional, single diaphragm, gold-sputtered, gold-plated 3-pin XLR output connector, 2 interchangeable capsules with cardioid and omnidirectional pickup patterns.
	www.proacousticsusa.com /products.php?sId=70&pg=all (963 words)

	Colored DRG SafeSEAL AntiMicrobial Stethoscope Diaphragm (Box of 50)
		The non-allergenic, chemically inert soft diaphragm conforms to the diameter of your stethoscope chestpiece to create an airtight seal, similar to that of a drum.
		The DRG SafeSEAL Stethoscope Diaphragm is impregnated with an antimicrobial compound, which preserves the integrity of the diaphragm, and thus makes it suppress the growth of bacteria and mold.
		The SafeSEAL Antimicrobial Soft Diaphragm is intended for use to minimize surface contamination and facilitate cleaning and disinfection of the stethoscope diaphragm.
	www.allheart.com /omhsamd50.html (269 words)

	Littmann (Site not responding. Last check: 2007-11-02)
		Tunable diaphragm technology allows you to conveniently alternate between low and high frequency sounds without turning over the chestpiece.
		The excellent acoustic sensitivity of a patented tunable diaphragm is the hallmark of the low-profile Littmann Master Classic II stethoscope.
		Superior acoustics are combined with digital signal processing offering recording, storage and playback capabilities.
	www.usemc.com /Littmann.html (1163 words)

	Gold Coast Medical Supply supplies, Pharmaceuticals,flu vaccine,IV,Diagnostic tests
		Known as the ultimate acoustical stethoscope, this masterpiece in one movement is designed to let you hear both high and low frequency sounds from a patented single sided chestpiece.
		It's patented single side tunable diaphragm allows monitoring of both high and low frequency sounds without having to turn over the chestpiece.
		Littman Classic II S.E. Known as the standard in the industry, this performance stethoscope features the tunable diaphragm that allows both high and low frequency sound to be heard by simply alternating the pressure on the chestpiece.
	www.gcmedicalsupply.com /shopdisplayproducts.asp?id=43&cat=Stethoscopes (522 words)

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