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Topic: Decibel

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Sound intensity level

Sound pressure level

Phon

Sound

Sone

DBm

Sound intensity

Power (physics)

Microvolt

DB

DBrn

Internal impedance

Acoustics

Signal strength

	Decibels
		The decibel scale is a reflection of the logarithmic response of the human ear to changes in sound intensity:
		The sound intensity in decibels above the standard threshold of hearing is calculated as a logarithm.
		In fact, the use of the factor of 10 in the definition of the decibel is to create a unit which is about the least detectable change in sound intensity.
	hyperphysics.phy-astr.gsu.edu /hbase/sound/db.html (510 words)

	decibel
		The decibel is made a unit by specifying the magnitude of one element of the ratio; this is the reference level.
		For power, the decibel is 10 times the common logarithm of the ratio of the power of the signal being described to the power of the reference level.
		In acoustics, decibels are used to express sound intensity levels (10 times the common logarithm of the ratio between the measured intensity and a reference intensity), and sound pressure levels (20 times the common logarithm of the ratio between the measured pressure level and a reference pressure level).
	www.sizes.com /units/decibel.htm (1153 words)

	Theremin Vox - Decibel
		Although it is widely used as a measure of the loudness of sound, the decibel is more generally a measure of the ratio between two quantities, and can be used to express a wide variety of measurements in acoustics and electronics.
		The decibel is used rather than arithmetic ratios or percentages because when certain types of circuits, such as amplifiers and attenuators, are connected in series, expressions of power level in decibels may be arithmetically added and subtracted.
		However, voltage-based decibels are frequently used to express such quantities as the voltage gain of an amplifier, where the two voltages are measured in different circuits which may have very different resistances.
	www.thereminvox.com /article/view/170/1/37 (2507 words)

	What is decibel? - a definition from Whatis.com - see also: dB
		Decibels can be calculated in terms of the effective voltage if the load impedance remains constant.
		In sound, decibels are defined in terms of power per unit surface area on a scale from the threshold of human hearing, 0 dB, upward towards the threshold of pain, about 120-140 dB.
		Decibel units are commonly used in audio equalizers, both the hardware kind and the software kind, as a convenient reference point while editing.
	searchcio-midmarket.techtarget.com /sDefinition/0,,sid183_gci213525,00.html (498 words)

	KDE Decibel: Overview
		Decibel is implemented in a desktop wide server process, offering services via DBus.
		Decibel uses telepathy compatible protocol implementations to connect to realtime communication servers.
		Decibel can get contact information from the desktops PIM database and use this information to connect to any contact.
	decibel.kde.org /index.php?id=docs (260 words)

	Decibels, calculations, decibel reference values, acoustics, antenna amplfiers
		Decibels The decibel (dB) is a measure of the ratio between two quantities, and is used in a wide variety of measurements in acoustics, physics and electronics,...
		Decibels and their use in radio systems understanding Decibels and their use in radio systems, dBi, dBd, EIRP, This article discusses the basic unit of measurement used in radio signals: the decibel or dB.
		UNDERSTANDING AND USING THE DECIBEL The decibel, or dB, is a means of expressing the gain of an active device (such as an amplifier) or the loss in a passive device (such as an attenuator or length of cable),...
	www.educypedia.be /electronics/decibels.htm (883 words)

	What is decibel? - a definition from Whatis.com - see also: dB
		In electronics and communications, the decibel (abbreviated as dB, and also as db and DB) is a logarithmic expression of the ratio between two signal power, voltage, or current levels.
		Decibels can be calculated in terms of the effective voltage if the load impedance remains constant.
		Decibel units are commonly used in audio equalizers, both the hardware kind and the software kind, as a convenient reference point while editing.
	whatis.techtarget.com /definition/0,,sid9_gci213525,00.html (485 words)

	Decibel: the early years
		Decibel grew up in an average working class family, which saw him go through high school and then university where he majored and graduated in Biochemistry.
		Decibel is currently working on a new project and a preview of this will be showcased later this month when he shares the stage in the United Kingdom with the award-winning Oliver Mtukudzi.
		Decibel will be the supporting act when Oliver Mtukudzi performs over Easter: Saturday 26 March at the Shepherds Bush Empire in London, Sunday at the Empire in Milton Keynes, and on Monday 28 at the Town and Country Club in Bradford.
	www.newzimbabwe.com /pages/tuku12.12396.html (618 words)

	The Elusive Decibel - Thoughts on Sonars and Marine Mammals
		By definition, the decibel is a relative unit, not an absolute unit with a physical dimension; unless the standard of comparison is cited, the term "decibel" is to all intents and purposes useless.
		Acousticians introduced the decibel to devise a compressed scale to represent the large dynamic range of sounds experienced by people from day to day, and also to acknowledge that humans—and presumably other animals—perceive loudness increases in a logarithmic, not linear, fashion.
		Accordingly, the level difference in decibels associated with two sound pressure values (measured in the same medium) is determined by calculating the ratio of the pressures, squaring this number, taking the logarithm (base 10), and multiplying by 10.
	www.atlantic.drdc-rddc.gc.ca /factsheets/elusive_decibel_e.shtml (1735 words)

	The Decibel
		However, the decibel is sometimes used to describe sound pressure levels without stating the unit of measurement or the point of reference: "the sound reached 115 decibels in the fourth row", or "the output of the Fictional amplifier is 115dB".
		The decibel is convenient for comparing levels in sound systems because the greatest sound pressure the ear can accommodate without discomfort is around 1,000,000 (yes, a million*) times greater than the smallest sound pressure the ear can detect.
		In power terms, 1 decibel is roughly the difference between 10 Watts and 12.5 Watts, and this difference in volume sounds about the same as the difference between 1,000 Watts and 1,250 Watts (also 1 decibel).
	www.astralsound.com /the_decibel.htm (1786 words)

	What is decibel? - a definition from Whatis.com - see also: dB
		Decibels can be calculated in terms of the effective voltage if the load impedance remains constant.
		In sound, decibels are defined in terms of power per unit surface area on a scale from the threshold of human hearing, 0 dB, upward towards the threshold of pain, about 120-140 dB.
		Decibel units are commonly used in audio equalizers, both the hardware kind and the software kind, as a convenient reference point while editing.
	searchsmb.techtarget.com /sDefinition/0,,sid44_gci213525,00.html (548 words)

	KDE’s “Decibel”, and IM/VoIP for Linux in general « /home/liquidat
		Decibel will do the rest: checking for available protocols and implemented features, checking on which the other side is reachable, checking if this fits together and the task can be performed, perform the task.
		Decibel itself is a KDE4 project (think of it like Plasma, Phonon, Solid, Oxygen, …) and has some prominent supporters: the Team page for example lists Eva Brucherseifer, the current head of KDE e.V. As supporters you will find the non-profit organisation NLnet as well as the company Basyskom.
		Decibel itself emerged from the the OpenCDI and the KCall project, and was originally thought as an KDE integration of the Telepathy framework.
	liquidat.wordpress.com /2006/05/31/kdes-decibel-and-imvoip-for-linux-in-general (971 words)

	Decibel - Progressive/Thrash Metal, New Delhi India
		Decibel is a Progressive Metal band from India comprising of Krishnan, Karthik, Ripple, Rajiv and Naman.
		Decibel was formed in 2003 by Kanishk and Krishnan while pursuing their college.
		Decibel was started as Thrash Metal act, but with constant experimentation with various genres of Rock/Metal, individual influences and creativity of band members, Decibel has developed its own sound, which is mixture of Thrash Heavy Metal and Progressive/Technical Rock.
	www.decibel.in (154 words)

	Decibel - Teletraan I: The Transformers Wiki
		Decibel is an Autobot combiner in the Headmasters portion of the Generation 1 continuity family.
		Decibel is loyal and obedient to Twincast, but comes off as overly prim and proper to the other Cassette Transformers.
		Decibel is the combined form of the Graphy and Noise toys.
	transformers.wikia.com /wiki/Decibel (100 words)

	The Decibel Measurement System
		Nevertheless, a basic explanation of the decibel measurement system is necessary for you to understand the significance of dB readings and equipment gain ratings which are expressed in decibels.
		The reason for using the decibel system when expressing signal strength may be seen in the power ratios in table 2-1.
		The standard decibel abbreviation of dB is changed to dBm to indicate the use of the 1-milliwatt standard reference.
	www.tpub.com /neets/book11/45e.htm (2295 words)

	Decibel
		The decibel is defined as one tenth of a bel where one bel represents a difference in level between two intensities I
		In some situations, such as tape recording, a given intensity level is assigned 0 dB, and other levels are measured in negative decibels in comparison to it.
		scale attempts to account for the subjective response of the ear to loudness, which is not possible with the decibel measurement of intensity.
	www.sfu.ca /sonic-studio/handbook/Decibel.html (447 words)

	Privateline.com: Telecom Fundamentals: The Decibel
		A decibel is a single unit of sound, the first point on the decibel scale.
		One decibel is a relative measurement among people, it is the very limit of human hearing, the threshold point where sound can be detected by the ear and recognized by the brain.
		The decibel scale, like the pH scale that measures acidity and alkalinity, and the Richter scale, which measures earthquake energy, are logarithmic, that is proportional.
	www.privateline.com /decibel/decibel.html (1126 words)

	Decibel
		Decibel is a logarithmic unit used to describe the ratio of the signal level - power, sound pressure, voltage, intensity, etc.
		Decibel is a logarithmic unit used to describe the ratio of the signal level - power, sound pressure, voltage or intensity or several other things.
		Decibel A, B and C The sound pressure is not equally sensed by the human ear at different frequencies.
	www.engineeringtoolbox.com /decibel-d_341.html (420 words)

	Decibel
		Depending on the reference level used, the decibel symbol will be immediately followed by a letter, as: dBA - An "A" weighted decibel level.
		DBV A decibel voltage level, in which the reference, Vb, is 1.0 volt.
		Decibel -- A unit of level equal to ten times the logarithm of the ratio of two powers.
	lp2cd.com /audio_terms/d/decibel.html (199 words)

	Arts Council England : Project detail
		decibel is an Arts Council England initiative which works to support and raise the profile of artists of African, Asian and Caribbean descent in England.
		Comprising a cross art-form programme of projects and events, decibel was launched in 2003 and is funded until 2008.
		The decibel initiative was launched in 2003 in recognition that Black and minority ethnic (BME) artists and arts organisations are under-represented in the arts.
	www.artscouncil.org.uk /aboutus/project_detail.php?sid=3&id=79 (273 words)

	MySpace.com - decißel - New Delhi - Progressive / Thrash / Metal - www.myspace.com/decibelindia
		Decibel was formed in 2003 when guitarist Kanishk and drummer Krishnan came along with an idea of forming a band while pursuing their college.
		Decibel's first show was IIT Delhi Blitzkrieg 2003 prelims where band received good support in their first show and later that year played at The Mezz (Pub Gig).
		Decibel is planning to release their first album by end of year 2007.
	www.myspace.com /decibelindia (1534 words)

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