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Topic: Acoustic power

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Sound power level

Sound power

Sound intensity

Sound

Acoustics

Sound pressure level

SINAD

Audio system measurements

Speed of sound

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	Sound intensity - Facts, Information, and Encyclopedia Reference article
		The sound intensity, I, (acoustic intensity) is defined as the sound power P
		Z is the acoustic impedance, measured in N·s/m
		Sound intensity level is a different measure used in acoustics.
	www.startsurfing.com /encyclopedia/s/o/u/Sound_intensity.html (287 words)

	Acoustic Power Vs Electrical Power
		Acoustic power, rather than electrical power, is the objective of a sound system.
		For perspective, the relative acoustic power levels are shown in Table I in watts.
		To illustrate how electrical power requirements are determined from the desired level of acoustical power, assume an area of 2400 square feet, and a hexagonal pattern with minimum overlap spacing which dictates 26 speakers for coverage.
	www.jwd.com /tech/notes/tn70.htm (485 words)

	2. KEY PHYSICAL QUANTITIES
		Acoustic intensity (I) is defined as the amount of energy per second (power), passing through unit area normal to the direction in which the acoustic wave is propagated.
		Acoustic intensity is analogous to electrical power on the basis of the amount of energy and the time it flows or is used.
		The speed of acoustic waves in the sea is denoted by the symbol c and is measured in metres/second (m/s).
	www.fao.org /docrep/X5818E/x5818e03.htm (3990 words)

	6.4.1
		Acoustically powered medical nanorobots may derive their energy either from sources indigenous to the human body (Section 6.3.3 and Table 6.3) or from artificial sources placed in or on the human body.
		Thus attenuated, the power signal finally reaches the nanorobot and is converted to mechanical power using a piston-type transducer as described by Eqn.
		The greatest engineering challenge arises when whole-body acoustic power is to be supplied by some small extradermal source the size of a wristwatch, wallet, belt buckle, ankle bracelet, headband*, or amulet worn around the neck.
	www.nanomedicine.com /NMI/6.4.1.htm (1668 words)

	Acoustic barrier separator - Patent 5419877
		The power of the siren is selected such that the second harmonic content of the acoustic waveform develops a substantial Oseen force sufficient to balance the Stokes drag force on solid particulates in the flue gas flow.
		The application of an acoustic waveform according to the present invention enhances adsorption of sulfur oxides to injected sorbent particles through increased relative motion, and simultaneously provides for stagnation of the sorbent particles in the gas flow by means of the Oseen force, without the use of baghouse filters.
		Acoustic energy is provided to the sorbent particles in the flue gas along a 10-meter distance between the point of injection and the entrance to the chamber 70 by the acoustic source 72, some of the energy of which travels out of chamber 70 and into conduit 68.
	www.freepatentsonline.com /5419877.html (9135 words)

	Sound - Wikipedia, the free encyclopedia
		In a sound wave, the complementary variable to sound pressure is the acoustic particle velocity.
		For small amplitudes, sound pressure and particle velocity are linearly related and their ratio is the acoustic impedance.
		The acoustic impedance depends on both the characteristics of the wave and the medium.
	en.wikipedia.org /wiki/Sound (998 words)

	Title page for ETD etd-04242001-102238
		The maximum possible sound power radiated by a planar, baffled structure is shown to be equivalent to the largest eigenvalue of the acoustic power transfer matrix.
		The structural-acoustic power efficiency is the solution of a separate generalized eigenvalue problem whose parameters include the location of the electromechanical actuators and the type of electromechanical actuation.
		Numerical simulations demonstrate that maximizing the power efficiency requires that the magnitude and phase of the structural modal velocity vector be matched to that of the eigenvector that corresponds to the maximum eigenvalue of the acoustic power transfer matrix.
	scholar.lib.vt.edu /theses/available/etd-04242001-102238 (418 words)

	Acoustic power meter APM-1 (Site not responding. Last check: 2007-10-23)
		Measurement of acoustical power irradiated by a sound source and acoustical power absorbed in a volume of liquid at cavitation regime is an important problem that hasn't been solved till now though cavitation and is studied for many decades.
		We analyzed the dependence of acoustic power on geometry of a vessel, volume of liquid and depth of horn submergence.
		The power depends very weekly on increasing of the irradiating surface at horn submergence or at increasing of level of liquid in ultrasound bath (if irradiators are on the bottom only).
	www.akin.ru /e_comm_calor.htm (386 words)

	Sound power - Wikipedia, the free encyclopedia
		of a source is expressed in decibels (dB) and is equal to 10 times the logarithm to the base 10 of the ratio of the sound power of the source to a reference sound power.
		Sound power is neither room dependent nor distance dependent, like it is with sound pressure or sound intensity.
		Usable music sound (trumpet) and noise sound (excavator) have both the same sound power of 0.3 watts, but will be judged psychoacoustically to be different levels.
	en.wikipedia.org /wiki/Sound_power (195 words)

	Sound power level - Wikipedia, the free encyclopedia
		Sound power level or acoustic power level is a logarithmic measure of the sound power in comparison to a specified reference level.
		The Trumpet and excavator both have the same sound power of 0.3 watts, but may be judged psychoacoustically to be different levels.
		As noise is unwanted sound the trumpet can be perceived to be acceptable when listened to as music but at the same sound power level may be perceived to be noisy if one is trying to sleep.
	en.wikipedia.org /wiki/Sound_power_level (231 words)

	4. FORMING THE ACOUSTIC EQUATIONS
		The effectiveness of acoustic systems can be limited by the sea's own natural background of acoustic energy (noise), which is increased by transfer of energy from the wind, fast currents over certain types of seabed, Harden Jones and Mitson (1982), or from rain acting on the surface.
		Power input (Pe), to the transducer is in the form of an electrical pulse and is measured across the cable connections from the transmitter to the transducer.
		Therefore the acoustic intensity on the axis of the beam decreases in proportion to the distance squared.
	www.fao.org /docrep/X5818E/x5818e05.htm (3349 words)

	Norman G. Clark - Intonix Acoustic Machinery Monitor
		Essentially, the Acoustic Machinery Monitor is a real-time digital filter analyser with switch-configurable characteristics, relay outputs, non-volatile memory, and a "learn mode".
		It continuously computes the power spectrum of an acoustic signal by performing 1/12th octave bandpass filtering over an eight octave range, computing the acoustic power output, in decibels, of each of the resulting 96 bandpass filters.
		During this time, the monitor records the power spectrum of the signal in non-volatile memory as the acoustic signature of the machine or process.
	www.ngclark.com.au /Products/intonixmore.html (1173 words)

	What is Acoustic Power: Rent Com Inc: Audio Visual, Video, Projection, Presentation Rental AV Equipment (Site not responding. Last check: 2007-10-23)
		The concept of acoustic power is not readily considered by most people, due in part to the industry's preoccupation with sound pressure.
		The goal in driver design is to maximize the amount of acoustic power available from the device, given the constraints and trade-offs between the available parameters.
		Once the acoustic power has been realized, we then turn our focus to pattern control devices (horns) that will channel this power to a smaller unit area, increasing the sound intensity for that area, increasing the sound pressure (at a given listening position) beyond what it would have been if no pattern control was used.
	www.rentcom.com /wpapers/commun/sec3.html (473 words)

	Acoustic Associates - Power Generation
		Operational noise from power generation continues through the night.
		Acoustic Associates can provide background monitoring, noise predictions, recommendations for noise control and commission noise checks to support planning applications for a number of different types of plant.
		We are able to cover all aspects of noise and vibration associated with power plant, oil and gas exploration and associated works including:
	www.acousticassociates.co.uk /powergen.htm (282 words)

	Reverberation Chamber Determination of the Acoustic Power of Pure-Tone Sources
		A method was developed that is used to determine the acoustic power radiated by pure-tone and "nearly-pure-tone" sources in a reverberation chamber.
		The 3-dimensional standing wave sound field generated by a pure-tone source is sampled by a microphone that slowly sweeps a circular path in the chamber.
		The acoustic power of the source is then readily calculated from the effective rms pressure, the volume of the chamber and its absorption.
	domino.research.ibm.com /tchjr/journalindex.nsf/0/34000649cf765c4b85256bfa00683fa7?OpenDocument (111 words)

	Buy Acoustic Guitar Amps Online (Site not responding. Last check: 2007-10-23)
		For the acoustic musician on the move, the Ashdown Acoustic Radiator 1 combines a 100-watt bridged power section, a fully featured preamplifier and an 8 in., dual tweeter array driver in a compact, portable and beautifully designed cabinet....
		Although there are many acoustic amps on the market today, few of them can compete with the rich, natural tone of the compact AC-60 Acoustic Chorus amplifier.
		The Shenandoah Series of acoustic guitar amps have been designed with professional appointments and quality to reproduce the warmth and woody tone of a quality acoustic instrument....
	www.buy-cheap-music-production-equipment.com /Acoustic-Guitar-Amps (1127 words)

	sound power - Measurement Encyclopedia - National Instruments
		is a fundamental property of a sound source, that is, the amount of acoustic power radiated into the environment.
		The sound power output of a source can be likened to the thermal output of a space heater.
		Typical sound power measurements are made by averaging a statistically significant number of measuring points around the radiating device.
	zone.ni.com /devzone/nidzgloss.nsf/345429a29b12a2fc86256879000c059b/dbc56a7a24efc4858625686a0078b788?OpenDocument (123 words)

	POWER EFFICIENCY OF ACTIVE STRUCTURAL-ACOUSTIC CONTROL SYSTEMS
		Power flow models for active structural-acoustic control systems are investigated.
		Leo, D.J., Austin, E., and Beattie, C., 2001, "Constrained substructure approach to optimal strain energy analysis," to appear in the ASME Journal of Vibration and Acoustics.
		Cao, R., Leo, D.J., 1998, "An eigenvalue technique for analyzing structural-acoustic power efficiency," Proceedings of the Fifth Annual Symposium on Smart Structures and Materials, SPIE vol.
	filebox.vt.edu /users/donleo/current_projects/poweff/poweff.htm (317 words)

	how to play this power chord? - Acoustic Guitar Forum
		Power chords are usually 2-3 notes on the lower strings.
		Most people fret the chord that toremainn listed much like a "single bar chord" at the 7th fret where the index finger of the fretting hand is on the 7th fret 6th string, the ring finger is on the 9th fret 5th string, and the pinky is on the 9th fret 4th string.
		But a lot of electric players will use the alternative fingering of a "double bar chord" where the index finger is on the 7th fret 6th string and the ring finger frets both the 5th and 4th strings at the 9th fret.
	www.guitarseminars.com /ubb/Forum1/HTML/009360.html (1127 words)

	Acoustics (Site not responding. Last check: 2007-10-23)
		The Electropneumatic Transducers range for 4,000 to 10,000 acoustic watt output and are designed to implement a multi-segmented approach to acoustic spectra shaping.
		Each transducer is utilized to optimize the power application similar to a high fidelity system, providing a "woofer", "mid-band", and "tweeter".
		Complete turnkey acoustic testing facilities are available including construction of acoustic chamber, gas supply, instrumentation and acceptance testing.
	www.ling1.com /acoustic.htm (132 words)

	Sound Power, Intensity and Pressure
		Decibel is a logarithmic unit used to describe the ratio of the signal level - power, sound pressure, voltage or intensity or several other things.
		Sound power is the energy rate - the energy of sound per unit of time (J/s, W in SI-units) from a sound source.
		Sound Intensity The sound intensity level is the acoustic power of a sound per unit of area in relation to a fixed reference.
	www.engineeringtoolbox.com /sound-power-intensity-pressure-d_57.html (413 words)

	Acoustic Image Clarus Amplifier - plus more Upright Bass, Guitar, Acoustic Musical Instrument Pickups, Preamps, ...
		The Acoustic Image Clarus integrated amplifier was designed to accurately reproduce the sound of all acoustic and electric instruments using a compact and highly portable electronic system.
		The tonal shaping characteristic of the three band EQ preamp is able to help you overcome room acoustics or to subtly shape the sound of the instrument being amplified.
		Here are a few speaker, instrument, and power cable options; visit my Cables Page for a complete selection of useful as well as hard-to-find cables.
	www.gollihur.com /kkbass/accimg2.html (1930 words)

	Pneumatic Options Research Library: Acoustic Power
		The Piston Made of Air (4th edition), The Kadenacy Effect and its use in the driving of pulsejets and pulsating combustors, and in the tuning of two-stroke exhaust systems.
		Acoustic Power Devices, 2nd edition, Bellocq/Bentley/Bodine and how they do all kinds of pumping and other work with nothing but sound waves; fluid friction heaters, pulsometer pump, ram pump, reciprocating-jet pump, hydropulse engine, acoustic levitation.
		Thermoacoustic Heat Pumps, Tim Lucas of Macrosonix and his high-pressure sound-powered refrigeration, articles and patents detailing the origin and history of the new field of acoustic refrigeration.
	www.aircaraccess.com /catacous.htm (271 words)

	Acoustic Zen's ABSOLUTE Power Cord
		Acoustic Zen has grown into one of the major players in the field of hi-end audio cable makers.
		The Absolute power cord is as stiff and perhaps a hair or three thicker than the Gargantua II.
		In all areas, from the lowest double bass notes of the orchestra, to the triangle strikes from the rear of the stage, there was more clarification of the instrumentation of the orchestra which made it easier to determine one instrument from another, even in the same family.
	www.audiophilia.com /hardware/ma14.htm (1386 words)

	One Little Indian Records - U.S.
		Their album Power in the Blood displays the band’s groundbreaking and stunningly distinct sound of gospel, country, rap, techno, blues, house music and rock.
		Following Power In The Blood, the band released their fully acoustic album, Last Train To Mashville.
		Last Train to Mashville is a collection of 11 acoustic recordings, including “Woke Up This Morning” the theme song to the TV show, “The Soprano’s” as the lead track.
	www.onelittleindian-us.com /a3.html (136 words)

	Acoustic Image Contra and Contra R Amp - plus more Upright Bass, Guitar, Acoustic Musical Instrument Pickups, Preamps, ...
		The Acoustic Image Contra was one of the most exciting and innovative products for the Double Bass and acoustic instrument world in recent memory.
		A zippered pouch is provided to carry the power cable and other small items, shown in the photo to the right (without the carry strap).
		The Acoustic Image Contra bass amplification system was designed to accurately reproduce the sound of upright and electric bass, as well as a long list of other instruments, using one small, easy-to-carry enclosure.
	www.urbbob.com /aicontra.html (2857 words)

	power capacitor,power acoustic capacitor,illinois capacitor manufacturer and power capacitors,power acoustic ...
		As a professional power capacitors, power acoustic capacitors, illinois capacitors manufacturer, exporter, supplier and factory in China.--Handing Electronics is found by the board chairman Mr.
		The company have the specialized workshop which are used for CBB series, CD60 capacitor, power capacitor, power acoustic capacitor, illinois capacitor manufacturing industry standard.
		The product, power capacitors, power acoustic capacitors, illinois capacitors has obtained quality authentication as the UL, CSA, VDE, TUV, CE, CB, CQC, SGS and sold well in Europe, North America and Southeast Asia country and area.
	www.capacitor-china.com /n_power_capacitor.htm (314 words)

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