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Topic: Sound power

Related Topics

Sound power level

Acoustic power

Sound pressure level

Sound intensity level

Sound intensity

Particle velocity

Sound energy flux

Sound

Particle velocity level

Speed of sound

Acoustics

Sound impedance

Common logarithm

Energy

Characteristic impedance

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	Noise and Hearing Conservation Technical Manual Chapter: Noise and Health Effects (App I:A-3)
		Sound Power (W) is the amount of energy per unit time that radiates from a source in the form of an acoustic wave.
		This distribution of sound power over the area of the propagating wave is designated as intensity and is measured in units of watts per square meter.
		Sound power is analogous to the power rating of a light bulb.
	www.osha.gov /dts/osta/otm/noise/health_effects/soundpropagation.html (827 words)

	Sound - Wikipedia, the free encyclopedia
		Sound is characterized by the properties of sound waves which are frequency, wavelength, period, amplitude and velocity or speed.
		Sound propagates as waves of alternating pressure, causing local regions of compression and rarefaction.
		Sound velocity c or velocity of sound should not be confused with sound particle velocity v, which is the velocity of the individual particles.
	en.wikipedia.org /wiki/Sound (752 words)

	Sound power: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-02)
		Sound is vibration, as perceived by the sense of hearing....
		The watt (symbol: w) is the si derived unit for power (physics)power....
		Sound power level or acoustic power level is a logarithmic measure of the sound power in comparison to the reference level of 0 db (decibels)....
	www.absoluteastronomy.com /encyclopedia/s/so/sound_power.htm (529 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 (200 words)

	ipedia.com: Sound Article (Site not responding. Last check: 2007-10-02)
		Sound is defined as a mechanical compression and rarefaction or a longitudinal displacement wave that propagates through a medium (solid, liquid or gas).
		Sounds that are sine waves with a single pair of frequency and amplitude components are generally perceived as a pure tone.
		Sound perception can also be used for acquiring information about the surrounding environment in properties such as spatial characterics and presence of other animals or objects.
	www.ipedia.com /sound.html (578 words)

	Sound Quality Glossary Terms
		Sound intensity, I: [MT-3]; W/m2 the quotient obtained when the average rate of energy flow in a specified direction and sense is divided by the area, perpendicular to that direction, through or toward which it flows.
		Sound transmission coefficient, r: [dimensionless]---of a partition, in a specified frequency band, the fraction of the airborne sound power incident on the partition that is transmitted by the partition and radiated on the other side.
		Sound transmission loss, TL: Of a partition, in a specified frequency band, ten times the common logarithm of the ratio of the airborne sound power incident on the partition to the sound power transmitted by the partition and radiated on the other side.
	www.owenscorning.com /around/sound/glossary.asp (7146 words)

	ProSoundWeb \| Audio Power Trip pg. 2
		Power is paid for by the kilowatt-hour, and the prudent owner or renter tries to get as much benefit as possible out of the least amount of consumption.
		The power rating indicates how much power is dissipated in the process of generating the rated number of lumens.
		The ratio between the applied electrical power and the radiated sound power is the loudspeaker’s efficiency, which indicates the percentage of electrical power that is converted into sound power.
	www.prosoundweb.com /lsi/power/power2.php (1312 words)

	The Power of Sound
		Sound is the element that activates certain domains of the full matrix of a given scene in the recipient's mind and makes the recipient conceptualise the scene in a way peculiar to that individual.
		Although the new sounds produced in the target language are gathered in the same rhyming pattern and nearly the same (shorter) rhythmic pattern, major differences between the contents of the source and the target texts ultimately result in the loss of original associations.
		The examples of sound associations evoked by a piece of art, their importance and the differences between the source and the target image they evoke grow in number as soon as we start looking around, and it is impossible to discuss in detail all that deserves discussing.
	accurapid.com /journal/18sound.htm (7560 words)

	Sound Power and Intensity
		For a sound wave, the amount of energy transported is proportional to the square of the amplitude of the wave.
		As with our defintion of sound pressure level, we are forced to first find the ratio of the sound power to some reference power level.
		The next step to show the equality of sound pressure level and sound intensity level is to realize that the intensity in a sound wave is proportional to the square of the amplitude of the sound wave.
	hep.physics.indiana.edu /~rickv/Sound_intensity.html (912 words)

	Sound Intensity
		To assess sound loudness, as distinct from an objective intensity measurement, the sensitivity of the ear must be factored in.
		Since audible sound consists of pressure waves, one of the ways to quantify the sound is to state the amount of pressure variation relative to atmospheric pressure caused by the sound.
		Sound level measurements in decibels are generally referenced to a standard threshold of hearing at 1000 Hz for the human ear which can be stated in terms of sound intensity:
	hyperphysics.phy-astr.gsu.edu /Hbase/sound/intens.html (493 words)

	ISVR Consulting - Sound Power Measurement
		This sound level is important because it relates to the loudness of the sound and to the potential damaging effect on hearing.
		A sound power level on the other hand is a measure of the total noise radiated by the machine in all directions.
		Sound power is measured in watts or picowatts, and sound power levels are traditionally given in decibels (dB re 1pW), where 0 dB corresponds to 1 picowatt.
	www.isvr.co.uk /labtests/swl.htm (667 words)

	Brüel & Kjær Sound & Vibration
		Sound Power is the most universal of all acoustic metrics.
		Sound Power measurements can be used to make absolute comparisons between different products, predict the sound pressure level in any given environment, and determine acoustic hotspots via sound source ranking.
		Measuring sound power in a reverberation chamber is another common technique that is less expensive than traditional free field techniques.
	www.bkhome.com /bk_template1.asp?spid=194&ctid=90 (308 words)

	SoundStage! Equipment Review - Essential Sound Products The Essence Power Cord and Power Distributor (10/1999)
		Years ago, after borrowing a power cord from a local dealer and being surprised by its effects, he pulled out his physics books and approached the design of a power cord with no preconceived ideas as to how the finished product might look or be constructed.
		To their credit, though, the ESP power cords and Power Distributor are wildly positive additions and may be absolutely perfect in every way for some systems that need a bit of humanizing, which the ESP products do in a multifaceted manner.
		The power cords they replaced for this review are very fine too and have strengths that the ESP cords can’t match, but as a system, The Essence power cords and Power Distributor, all $4900+ of them, were a treat to use.
	www.soundstage.com /revequip/esp_power_cord.htm (2828 words)

	Sound Power
		Sound power can also indicate the potential intelligibility of a sound system to be gained.
		Therefore, a loudspeaker with an even or flat sound power characteristic would seem like a good one, in that the off-axis radiation would have a nominally similar characteristic to the on-axis sound (assuming that the loudspeaker has a flat axial frequency (Lp) response, which, after all, is the inherent aim of most loudspeakers).
		The sound power response of a loudspeaker is an extremely useful parameter that in many situations can act as a superior indicator of potential loudspeaker performance and can allow an indication of potential speech intelligibility.
	svconline.com /mag/avinstall_sound_power (1796 words)

	Tantra Tour Sound Chicago \| Power vs. Power (article)
		Over the years, sound systems have become much more dynamic particularly in the low end or sub frequency range thus requiring more electrical power not always available from a typical wall outlet.
		In simple terms they are bypassing all of the wall outlets and small gauge wire associated with them by "tapping in" to the electrical panel and taking their electricity right off the buss in the panel where the main feed first shows up in the building.
		As a general rule, power amplifiers are the biggest culprits for power consumption.
	www.tantrasound.com /article1.php (1193 words)

	Sound Power and Sound Pressure
		Sound power is the acoustical energy emitted by the sound source, and is an absolute value.
		Sound pressure is a pressure disturbance in the atmosphere whose intensity is influenced not only by the strength of the source, but also by the surroundings and the distance from the source to the receiver.
		Sound pressure corresponds to the brightness in a particular part of the room; both can be measured with a meter and the immediate surroundings influence the magnitude of each.
	www.trane.com /Commercial/library/vol253/v253b.asp (402 words)

	Healing Power of Overtone Chant by Nestor Kornblum
		Indeed, it is our modern, Western science that provides the most convincing evidence of the power of sound to shape and transform matter, which is the basis of its healing potential.
		By directing the correct sound toward ourselves, or toward a person wishing to be healed, we are able to return to an optimum, healthy vibration.
		Sound is able to dissolve these crystallisations of potentially harmful energy long before they reach the physical body.
	www.soundtherapyassociation.org /art_healing_power_overtone_nk.htm (1514 words)

	Elliott Sound Products - Audio Power Amplifier Design Guidelines
		All power amplifiers (well, nearly all) use emitter follower type output stages, and when a speaker lead and speaker (or even a non-inductive dummy load) are connected, oscillation often results.
		Full power bandwidth - the ability of an amp to supply full power over its entire operating frequency range - is a sure way to destroy hearing, HF horn drivers (etc) in a live music situation, so the compromise was not a limitation.
		A suitable power transistor may be specified for a minimum gain (Hfe) of 25, with a collector current of 4A.
	sound.westhost.com /amp_design.htm (12465 words)

	Live Sound International \| Power Lines: Audio Power Trip Part 1
		Great care must be taken to be sure which one a power rating is describing, since a larger rating may be better for a power generator, but a smaller rating may be better for a power consumer.
		If your bike were hooked to the power grid you could sell your hour’s effort to the utility company for about ten cents, assuming that they can convert all of the generated power into electricity.
		So it would take about 10 people to generate as much power as one horse, which is why a good horse (or the modern equivalent - a tractor) might be considered of greater value than a person, at least when it comes to farm work.
	www.livesoundint.com /archives/2003/feb/power.php (2350 words)

	Fact Sheet: Know the Power of Sound
		Each decibel is one tenth of a bel, which is a unit that measures the intensity of sound.
		At 90 dB of uninterrupted sound, the limit of safe noise exposure is eight hours.
		For each six dB increase of uninterrupted sound thereafter, the limit of safe exposure is reduced by half.
	www.entnet.org /healthinfo/hearing/sound.cfm (111 words)

	Sound Power - Sydney - NSW - Australia
		the sound power level has been determined by measurements of the sound pressure level of a piece of equipment that needs to be placed during these measurements:
		Based on these measurements, the sound power level of the piece of equipment is determined by the sophisticated analyser.
		Using this system, the sound power level may be determined according to ISO 9614-2 or ANSI S12.12.
	www.pccd.com.au /sound_power.htm (296 words)

	Measurement of Sound Power Level Emissions- Developer Zone - National Instruments
		The sound power level of the UUT is determined from the known sound power output of the RSS, the sound pressure level created by the RSS in the test environment, and the sound pressure level created by the UUT in the test environment.
		The space/time averaged sound pressure level generated by the UUT is determined by sampling the sound pressure levels in theÂ reverberation chamberÂ at a number of fixed positions or over a traversed path.
		The sound power level of the UUT is determined from the known sound power output of the RSS, the sound pressure level created by the RSS in theÂ reverberation chamber, and the sound pressure level created by the UUT in the reverberation chamber.
	zone.ni.com /devzone/cda/tut/p/id/1406 (1494 words)

	Sound Power
		Sound Power, Intensity and Pressure An introduction to decibel, sound power, sound intensity and sound pressure
		Fans and Sound Power The Sound Power Level from fans depends on the motor power and the capacity of the fan - the static pressure and/or the discharged volume.
		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-level-d_58.html (513 words)

	CNN - Invention may do for sound what laser did for light - December 2, 1997
		Scientists have long known that sound is composed of pulsing waves of energy, but it was considered useless as a power source because at high levels sound waves distort into shock waves.
		He has used it to power such things as a gas compressor, but believes there is so much potential that he compares what he has done with sound to what the laser has done with light.
		His company, Macrosonix, is working on sound wave compressors which might one day do everything from cool refrigerators and air conditioners in the home to running compressors in factories and on construction sites.
	www.cnn.com /TECH/9712/02/sound.wave.energy (430 words)

	The Transcendent Sound Balanced Power Supply 1000VA
		Balanced power converts the single-ended power to a balanced power system with both wires now carrying 60 volts AC, each out of phase with each other.
		Power lines often have a type of noise called common mode noise which is present on both the neutral and hot wire.
		The Balanced Power Supply creates a new ground called a derived ground, that decouples equipment connected to it from these circulating ground currents in the rest of the house wiring.
	www.transcendentsound.com /power_supply.htm (626 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 Power The definition of Sound Power Level and the Sound Power from some common sources as fans, jet engines, cars, humans....
	www.engineeringtoolbox.com /sound-power-intensity-pressure-d_57.html (411 words)

	Sound Pressure Level and Power
		Because of the wide range, sound pressure measurements are made on a logarithmic scale (decibel scale).
		Total sound power emitted by a source in all directions.
		Two equal sources produce a 3 dB increase in sound power level.
	ccrma.stanford.edu /CCRMA/Courses/150/SPL.html (105 words)

	You've Got the Power
		POWER UP When you throw a rock into a lake, a force is exerted on the water, and a series of waves ripple out from the point of impact.
		Power, which is expressed in watts, describes the oomph behind a sound wave (more precisely, a force that can move a certain mass a certain distance in a certain amount of time).
		Sound amplitude levels are easier to visualize than sound power levels.
	emusician.com /mag/emusic_youve_power/index.html (2139 words)

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