unreferenced date June 2011 Image CCITT 0.41 and C Message weighting curve.svg 400px right Psophometricweighting refers to any weighting curve used in the measurement of noise. In the field of audio engineering it has a more specific meaning, referring to noise weightings used especially in measuring noise on telecommunications circuits. Key standards are ITU T O.41 and C message weighting as shown here. References International standard ITU T O.41 see ITU See also Audio quality measurement Equal loudness contour Fletcher Munson curves Noise measurement Headroom audio signal processing Headroom Psophometric voltage Rumble measurement ITU R 468 noise weighting A weightingWeighting filter WeightingWeighting curve telecommunications stub Category noise ... more details
Psophometric voltage is a Electronic circuit circuit noise voltage measured with a psophometer that includes a CCIF 1951 weighting filter weighting network . Psophometric voltage should not be confused with psophometric emf, i.e. , the emf in a generator or line electrical engineering line with 600 internal resistance. For practical purposes, the psophometric emf is twice the corresponding psophometric voltage. Psophometric voltage readings, V , in millivolts, are commonly converted to dBm psoph by dBm psoph 20 log sub 10 sub V 57.78. References FS1037C Category Electrical parameters Category Noise Category Telecommunications terms electronics stub telecomm term stub ... more details
contour A weighting ITU R 468 noise weightingPsophometricweighting Audio quality measurement ...File Acoustic weighting curves 1 .svg 300px right Image Lindos3.svg 300px right Image CCITT 0.41 and C Message weighting curve.svg 300px right Image IEC 98 1984 Rumble Weighting curves.svg 300px right Image IEC 386 Flutter weighting.svg 300px right The process of weighting involves emphasizing the contribution ... of adding extra weight to one side of a pair of scales to favour a buyer or seller. While weighting ... a spectrum of frequencies. Weighting and loudness In the measurement of loudness , for example, a weighting .... A commonly used weighting is the A weighting curve, which results in units of dBA sound pressure level. Because the frequency response of human hearing varies with loudness, the A weighting curve is only correct at a level of 40 phon and other curves known as B, C and D weighting are also used, the latter being particularly intended for the measurement of aircraft noise. Weighting in audio measurement In broadcasting and audio equipment measurements 468 weighting is the preferred weighting ... than pure tones. It is often not realised that equal loudness curves, and hence A weighting, only ... region on noise compared to tones. Other weighting curves are used in rumble measurement and flutter measurement to properly assess subjective effect. Weighting and gamma rays In the measurement of gamma .... Weighting and television colour components Another use of weighting is in television, where the red .... Weighting and UV factor derivation for sun exposure Skin damage due to sun exposure is very wavelength ... 30 times as much damage as the longer one. In the calculation of UV Index , a weighting curve is used ... a standard curve referred to as A weighting , one of a set that are said to be derived from equal loudness contours . Weighting in 3D Modeling and Animation Weighting in the context of 3D modeling ... for this is so that during deformation, the geometry of the skin does not fold in on itself. Weighting ... more details
also Noise Signal noise Sound level meter ITU R 468 noise weightingPsophometricweighting Audio quality ...File Acoustic weighting curves 1 .svg thumb 400px right A graph of the A , B , C and D weightings across ... thumb 400px right Video illustrating A weighting by analyzing a sine sweep contains audio A weighting ... 2003 and various national standards relating to the measurement of sound pressure level . The weighting ... as dB A . Other weighting sets of values B, C, D and now Z are discussed below. The curves were originally defined for use at different average sound levels, but A weighting, though originally intended ... weighting is now mandated for all these measurements, although it is badly suited for these purposes ... author Richard L. St. Pierre, Jr. author1 Daniel J. Maguire title The Impact of A weighting ... 2011 09 13 ref A weighting is also used when measuring low level noise in audio equipment, especially ..., broadcasters and audio engineers Who date July 2010 more often use the ITU R 468 noise weighting ... the A, B and C weightings were based are really only valid for pure single tones. History of A weighting A weighting began with work by Fletcher Munson curves Fletcher and Munson which resulted in their publication ... revised as ANSI S1.4 1981, incorporated B weighting as well as the A weighting curve, recognising the unsuitability of the latter for anything other than low level measurements. But B weighting has since ... posed by different levels, and work by the BBC resulted in the CCIR 468 weighting, currently maintained as ITU R 468 noise weighting, which gives more representative readings on noise as opposed to pure tones. Citation needed date March 2009 Deficiencies of A weighting A weighting is only ... Dead link date March 2011 ref Nevertheless, it will be noted that A weighting would be a better match ... R 468 curve. If A weighting is used without further band limiting it is possible to obtain different ... measurements therefore require a 20 kHz low pass filter to be combined with the A weighting ... more details
set or the an instrument of the relevant class. See also A weighting ITU R 468 noise weighting Equal loudness contour Noise pollution Weighting filter Psophometricweighting DEFAULTSORT Noise Weighting ...Unreferenced date December 2009 A noise weighting is a specific amplitude vs. frequency characteristic that is designed to allow subjectively valid measurement of noise. It emphasises the parts of the spectrum that are most important. Usually, noise means audible noise, in audio systems, broadcast systems or telephone circuits. In this case the weighting is sometimes referred to as Psophometricweighting , though this term is best avoided because, although strictly a general term, the word Psophometric is sometimes assumed to refer to a particular weighting used in telecommunications. A major use of noise weighting is in the measurement of residual noise in audio equipment , usually present as hiss or hum in quiet moments of programme material. The purpose of weighting here is to emphasise the parts of the audible spectrum that our ears perceive most readily, and attenuate the parts that contribute less to our perception of loudness, in order to get a measured figure that correlates well with subjective effect. The ITU R 468 noise weighting was devised specifically for this purpose, and is widely used in broadcasting, especially in the UK and Europe. A weighting is also used, especially in the USA, though this is only really valid for the measurement of tones, not noise, and is widely incorporated into sound level meters. In telecommunication , noise weightings are used by agencies concerned with public telephone service, and various standard curves are based on the characteristics of specific commercial telephone instruments, representing successive stages of technological development. The Channel coding coding of commercial apparatus appears in the nomenclature of certain weightings. The same weighting nomenclature and units are used in military versions of commercial ... more details
tones. Psophometricweighting is used in telephony and telecommunications where narrow band circuits are common. Other applications of weighting Acoustics is by no means the only subject which finds use for weighting curves however, and they are widely used in deriving measures of effect for sun ...A Weighting curve is a graph of a set of factors, that are used to weight measured values of a variable according to their importance in relation to some outcome. The most commonly known example is frequency weighting in sound level measurement where a specific set of weighting curves known as A, B, C and D weighting as defined in IEC 61672 ref name soundlevel IEC 61672, which has superseded IEC 60651, IEC 651 and earlier standards ref are used. Unweighted measurements of sound pressure do not correspond to perceived loudness because the human ear is less sensitive at low and high frequencies, with the effect more pronounced at lower sound levels. The four curves are applied to the measured sound level, for example by the use of a weighting filter in a sound level meter, to arrive at readings of loudness in Phon s or in decibels dB above the threshold of hearing. see A weighting . Weighting curves in Electronic Engineering, Audio and Broadcasting Although A weighting with a slow rms detector, as commonly used in sound level meters ref name soundlevel is frequently used when measuring noise in audio circuits, a different weighting curve, ITU R 468 weighting uses a psophometricweighting curve and a quasi peak detector ref IEC 60268 1 ref . This method, formerly known as CCIR weighting ... equivalent man . Weighting is also applied to the measurement of sunlight when assessing the risk ... use of weighting is in television, where the red, green and blue components of the signal are weighted ... and chrominance signals for transmission. See also Weighting filter A weighting References references DEFAULTSORT Weighting Curve Category Sound Category Audio engineering Category Noise ... more details
weightingPsophometricweighting Equal loudness contour Noise pollution Noise regulation External links ...File Acoustic weighting curves 1 .svg right thumb 400px A weighting filter is used to emphasise or suppress ... equivalent level . Loudness measurements In the measurement of loudness, for example, an A weighting ... is to ensure that measured loudness corresponds well with subjectively perceived loudness. A weighting ... In the field of telecommunications, weighting filters are widely used in the measurement ... response of different types of instrument handset . Other noise weighting curves have existed, e.g. DIN standards. The term psophometricweighting , though referring in principle to any weighting curve intended for noise measurement, is often used to refer to a particular weighting curve, used in telephony for narrow bandwidth voiceband speech circuits. Environmental noise measurement A weighting ... level referenced to 20 micropascals 0 dB SPL. dBrn adjusted is a synonym for dBA. The A weighting ... meters see ITU R 468 noise weighting ITU R 468 weighting for a further explanation . A weighting ... A Weighting rather than on any good experimental evidence to suggest that such use is valid. The distance ... content. ITU R 468 noise weighting was therefore developed to more accurately reflect the subjective ... lc on , is maintained by the ITU. Noise measurements using this weighting typically also ... weighting with quasi peak detection is widely used in Europe, Citation needed date April 2010 especially ... corporation who realised its superior validity for their purposes. Its advantages over A weighting seem to be less well appreciated in the USA and in consumer electronics, where the use of A weighting predominates probably because A weighting produces a 9 to 12 dB better specification, see specsmanship ... dB below FS i.e. 86 dB relative to FS. The use of weighting curves is in no way to be regarded as cheating ..., so it will not be heard. A weighting is often used to compare and qualify Analog to digital converter ... more details
Flat weighting In a noise measuring set, a noise weighting based on an amplitude frequency characteristic that is flat over a frequency range that must be stated. Note 1 Flat noise power is expressed in dBrn f sub 1 sub f sub 2 sub or in dBm f sub 1 sub f sub 2 sub . Note 2 3 kHz flat weighting and 15 kHz flat weighting are based on amplitude frequency characteristics that are flat between 30 Hz and the frequency indicated. References FS1037C MS188 Category Noise ... more details
A weighting pattern for a linear dynamical system describes the relationship between an input math u math and output math y math . Given the time variant system described by math dot x t A t x t B t u t math math y t C t x t math then the output can be written as math y t y t 0 int t 0 t T t, sigma u sigma d sigma math where math T cdot, cdot math is the weighting pattern for the system. For such a system the weighting pattern is math T t, sigma C t phi t, sigma B sigma math such that math phi math is the state transition matrix . The weighting pattern will determine a system, but note that if there exists a Realization systems realization for this weighting pattern then there exists many that do so. ref cite book first Roger W. last Brockett title Finite Dimensional Linear Systems publisher John Wiley & Sons year 1970 isbn 9780471105855 ref Linear time invariant system In a LTI system then the weighting pattern is Continuous math T t, sigma C e A t sigma B math where math e A t sigma math is the matrix exponential . Discrete math T k,l C A k l 1 B math . References Reflist Category Control theory ... more details
London weighting is an allowance paid to certain civil servants, teachers, airline employees, police and security officers in the capital city capital of the United Kingdom of Great Britain and Northern Ireland United Kingdom , London . It is designed to help these workers with the cost of living in London, which is notoriously higher than that of the rest of the United Kingdom of Great Britain and Northern Ireland UK . ref http news.bbc.co.uk 1 hi programmes politics show 3154824.stm ref Its purpose is to encourage key workers to stay in London. London weighting was introduced for civil servants in 1920 and until 1974 it was set by the London Pay Board. However since 1974 the Greater London Council and later the Mayor of London , in partnership with central government, have been responsible for setting it. In 2002, teachers from across South East England went on strike to try to force London Weighting to be raised. As of March 2007, the London weighting is worth between 3,000 and 4,000. for RMO and civilian doctors was 2162 in 2012 In some professions, such as teachers, a different level of weighting is applied to Inner London and Outer London . ref http www.unison.org.uk acrobat b694.pdf ref ref http news.bbc.co.uk 1 hi education 1791149.stm ref Since the abolition of the Pay Board no organisation has been responsible for setting London weighting. The GLA carried out an investigation into the issue but did not propose a new figure as such. Currently the amounts paid by employers as London weighting, or London allowance, or in some cases both, vary greatly. Further information is available from pay analysts such as Labour Research Department and IDS Incomes Data Services Ltd Incomes Data Services Ltd . References reflist Category Economy of London ... more details
Implied weighting describes a group of methods used in phylogenetic analysis to assign the greatest importance to characters that are most likely to be homologous. The first attempt to implement such a technique was by Farris 1969 , ref name Farris1969 cite jstor 2412182 ref whereby a tree was constructed with equal weights, and characters that appeared as homoplasies on this tree were downweighted. The analysis was repeated with these new weights, and characters were again re weighted subsequent iteration was continued until a stable state was reached. However, the final tree depended strongly on the starting weights and the finishing criteria. ref name Goloboff1993 cite doi 10.1111 j.1096 0031.1993.tb00209.x ref The most widely used and implemented method follows from Goloboff 1993 . ref name Goloboff1993 The first time a character changes state on a tree, this state change is given the weight 1 subsequent changes are less expensive and are given smaller weights as the characters tendency for homoplasy becomes more apparent. The mathematical implementation of this algorithm is explained at http tnt.insectmuseum.org index.php Implied weighting. Goloboff recognizes that trees with the heaviest average weights give the most respect to the data a low average weight implies that most characters are being ignored by the tree building algorithms. ref name Goloboff1993 References Reflist Category Phylogenetics ... more details
In statistics , inverse variance weighting is a method of aggregating two or more random variables to minimize the variance of the sum . Each random variable in the sum is weighted in inverse proportion to its variance. Given a sequence of observations math y sub i sub with independent variances math sub i sub sup 2 sup , the inverse variance weighted sum is given by math frac sum i y i sigma i 2 sum i 1 sigma i 2 . math Inverse variance weighting is typically used in statistical meta analysis to combine the results from independent studies. See also Weighted least squares Unreferenced date February 2011 Category Data analysis Category Meta analysis Category Estimation theory statistics stub ... more details
The context tree weighting method CTW is a lossless compression and prediction algorithm by Citation last Willems, Shtarkov, and Tjalkens year 1995 . The CTW algorithm is among the very few such algorithms that offer both theoretical guarantees and good practical performance see, e.g., Citation last Begleiter, El Yaniv, and Yona year 2004 . The CTW algorithm is an ensemble method, mixing the predictions of many underlying variable order Markov model s, where each such model is constructed using zero order conditional probability estimators. External links Citation last Willems, Shtarkov, and Tjalkens year 1995 title The Context Tree Weighting Method Basic Properties publication place IEEE Transactions on Information Theory volume 41 Citation last Begleiter, El Yaniv, and Yona year 2004 title On Prediction Using Variable Order Markov Models publication place Journal of Artificial Intelligence Research volume 22 pages 385 421 url http www.jair.org media 1491 live 1491 2335 jair.pdf publisher Journal of Artificial Intelligence Research http www.data compression.info Algorithms CTW Relevant CTW papers and implementations http www.ele.tue.nl ctw CTW Official Homepage Compression Methods Category Lossless compression algorithms comp sci stub ru Context tree weighting ... more details
Inverse probability weighting is a statistical technique for calculating statistics standardized to a population different from that in which the data was collected. Study designs with a disparate sampling population and population of target inference target population are common in application ref name refname2 . There may be prohibitive factors barring researchers from directly sampling from the target population such as cost, time, or ethical concerns ref name refname3 . A solution to this problem is to use an alternate design strategy, e.g. stratified sampling. Weighting, when correctly applied, can potentially improve the efficiency and reduce the bias of unweighted estimators. One very early weighted estimator is the Horvitz Thompson estimator of the mean ref D. G. Horvitz and D. J. Thompson, A generalization of sampling without replacement from a finite universe , Journal of the American Statistical Association , volume 47, pages 663&ndash 685, 1952. ref . When the sampling probability is known, from which the sampling population is drawn from the target population, then the inverse of this probability is used to weight the observations. This approach has been generalized to many aspects of statistics under various frameworks. In particular, there are likelihood function weighted likelihoods , generalized estimating equations weighted estimating equations , and probability density function weighted probability densities from which a majority of statistics are derived. These applications codified the theory of other statistics and estimators such as marginal structural models , the standardized mortality ratio , and the EM algorithm for coarsened or aggregate data. Inverse probability weighting is also used to account for missing data when subjects with missing data cannot be included in the primary analysis ref name refname1 . With an estimate of the inclusion probability ... weighting can be used to inflate the weight for subjects who are under represented due to a large ... more details
Inverse distance weighting IDW is a method for multivariate interpolation , a process of assigning values to unknown points by using values from usually scattered set of known points. Here, the value at the unknown point is a weighted sum of the values of N known points. Shepard s method Image Shepard interpolation.png thumb 640px center Shepard s interpolation for different power parameters p , from scattered data points with either value 0 or 1. A general form of finding an interpolated value u at a given point x based on samples math u i u x i math for math i 0,1,...,N math using IDW is an interpolating function math u mathbf x sum i 0 N frac w i mathbf x u i sum j 0 N w j mathbf x , math where math w i mathbf x frac 1 d mathbf x , mathbf x i p math is a simple IDW weighting function, as defined by Shepard, ref cite conference last Shepard first Donald year 1968 title A two dimensional interpolation function for irregularly spaced data booktitle Proceedings of the 1968 Association for Computing Machinery ACM National Conference pages 517 524 doi 10.1145 800186.810616 ref x denotes an interpolated arbitrary point, x sub i sub is an interpolating known point, math d math is a given distance Metric mathematics metric operator from the known point x sub i sub to the unknown point x , N is the total number of known points used in interpolation and math p math is a positive real number, called the power parameter. Here weight decreases as distance increases from the interpolated points. Greater values of math p math assign greater influence to values closest to the interpolated point. For 0 p 1 u x has smooth peaks over the interpolated points x sub i sub , while as p 1 the peaks become sharp. The choice of value for p is therefore a function of the degree of smoothing desired ... mechanics. The proposed weighting function had the form math w k mathbf x frac 1 D mathbf x , mathbf ... interpolation DEFAULTSORT Inverse Distance Weighting Category Geostatistics Category Multivariate ... more details
peak measurement is also called psophometricweighting . This was once more important because ... a weighting filter curve, together with a quasi peak rectifier having special characteristics as defined ... well known in the USA where A weighting has always been used. Citation needed date April 2010 Explanation While most audio engineers are familiar with the A weighting curve, which was based on the 40 ... CCIR 468 weighting curve, now supported as an ITU standard is less well known outside of the UK and Europe . Originally incorporated into an ANSI standard for sound level meters , A weighting ... that gave rise to the 468 weighting, which together with quasi peak measurement rather than the rms measurement used with A weighting became widely used by broadcasters throughout United ... by BBC test methods. Telephone companies worldwide have also used methods similar to 468 weighting ... compact audio cassette with Dolby B Noise Reduction , alerted engineers to the need for a weighting ... of broadcast circuits, equipment and radio circuits. A weighting was not giving consistent results ... effect. Early efforts to produce a better weighting curve led to a DIN standard that was adopted ... combinations of weighting filter and quasi peak detector then in existence such as those defined in a now discontinued German DIN standard . This led to the CCIR 468 standard which defined a new weighting curve and quasi peak rectifier. The origin of the current ITU R 468 weighting curve can be traced to 1956. The 1968 BBC EL 17 report discusses several weighting curves, including one identified ... a 1953 paper by E. Belger. Dolby Laboratories took up the new CCIR 468 weighting for use in measuring ... Hi Fi column writers took up 468 weighting enthusiastically, observing that it reflected the roughly ... 60268, the international standard for sound systems. The CCIR curve differs greatly from A weighting ..., the resultant effect appears roughly as a tilt centred on 1 kHz imposed on the A weighting ... more details
Unreferenced date September 2009 lowercase title dBrnC dBrnC represents an audio level measurement, typically in a telephone circuit, relative to the circuit noise level , with the measurement of this level frequency weighted by a standard C message weighting filter. The C message weighting filter was chiefly used in North America. The Psophometric filter is used for this purpose on international circuits. See Psophometric weighting to see a comparison of frequency response curves for the C message weighting and Psophometric weighting filters. Decibel state uncollapsed Noise telecomm stub Category Noise ... more details
File Psophometer IMG 1665.JPG thumb Psophometer In telecommunication s, a psophometer is an instrument that provides a visual indication of the audible effects of disturbing voltages of various frequencies. A psophometer usually incorporates a weighting network . The characteristics of the weighting network depend on the type of Telecommunication circuit circuit under investigation, such as whether the circuit is used for high fidelity music or for normal speech. See also Psophometric voltage References FS1037C Electrical and electronic measuring equipment Category Electronic test equipment Category Noise Category Measuring instruments telecomm stub de Psophometer ... more details
unreferenced date September 2011 Noise measurement is carried out in various fields. In acoustics , it can be for the purpose of measuring environmental noise , or part of a test procedure using white noise , or some other specialised form of test signal . In electronics it relates to the sensitivity of communications systems, the purity of signals, or the quality of audio systems . The concept is to define the noise level below which signals cannot reliably be detected. It can be thought of as uncertainty of the information being carried over a communications channel . In audio systems and broadcasting specific methods are used to obtain subjectively valid results in order that different devices and signal paths may be compared regardless of the differing spectral distribution and temporal properties of the noise that they generate. In particular, the ITU R 468 noise weighting was devised specifically for this purpose, and is widely used for professional audio and broadcast measurements. Standards There are a number of standards for noise measurement, each with a different goal or focus, including Standard ITU R BS 468 widely used in Broadcasting and professional Audio. Standard IEC A weighting is widely used in Environmental Noise measurement. Standard CCIR recommendation 468 4 is now maintained as ITU R BS 468 Standard CCITT 0.41 refers to Psophometric weighting used on telephone circuits. Standard CCITT P53 is now continued as CCITT0.41 Standard BS 6402 1983 specifies Personal sound exposure meters. Standard BS 3539 1968 specifies Sound level meter s for motor vehicle noise. Standard BSEN 60651 supersedes BS 5969 1981 Sound level meter s See also Audio quality measurement Rumble measurement Noise dosimeter Noise environmental Noise economic Noise music Noise pollution ITU R 468 noise weighting A weighting Weighting filter Equal loudness contour Cosmic microwave background radiation External links http noboomers.home.insightbb.com default.htm Noboomers Noise Cate ... more details
lowercase The symbol dBrn or dB rn is an abbreviation for decibels above reference noise . Weighted noise power in dB is referred to 1.0 picowatt . Thus, 0 dBrn 90 dBm . Use of 144 Line electrical engineering line , 144 receiver, or C message weighting , or flat weighting , can be indicated in Bracket Parentheses 28 29 parentheses . With C message weighting, a one milliwatt , 1000 hertz Hz tone will read 90 dBrn, but the same power as white noise , randomly distributed over a 3 kHz band radio band will read approximately 88.5 dBrn, because of the frequency weighting. With 144 weightings, a one milliwatt, 1000 Hz white noise tone will also read 90 dBrn, but the same 3 kHz power will only read 82 dBrn, because of the different frequency weighting . References FS1037C MS188 Decibel Category Mechanics Category Units of measure ... more details
Noise in audio, recording, and broadcast systems refers to the residual low level sound usually hiss and hum that is heard in quiet periods of a programme. In audio engineering it can refer either to the acoustic noise from loudspeakers, or to the unwanted residual electronic noise signal that gives rise to acoustic noise heard as hiss . This signal noise is commonly measured using A weighting or ITU R 468 noise weighting ITU R 468 weighting Noise is often generated deliberately and used as a test signal . Two types of deliberately generated noise in common use are referred to as white noise , which has a uniform spectral power density at all frequencies, or pink noise which has a power spectral density that falls at 3dB octave with rising frequency. The latter is often more useful in audio testing because it contains constant energy per octave and hence per commonly used 1 3rd octave , rather than a prepondance of energy at high frequencies. In other words it contains energy that is distributed geometrically rather than linearly. See also Noise Noise music Noise music Noise measurement quiescent Noise electronics signal to quantization noise ratio ITU R 468 noise weighting A weighting Weighting filter Equal loudness contour External links http www.sengpielaudio.com calculator noise.htm White noise calculator, thermal noise Voltage in microvolts, conversion to noise level in dBu and dBV and vice versa Noise Category Noise Audio Category Audio electronics ... more details
In statistics , there are many applications of weighting Weighted mean Weighted harmonic mean Weighted harmonic mean Weighted harmonic mean Weighted geometric mean Least squares Weighted least squares Weighted least squares disambiguation ... more details
be stated or implied. In European practice, psophometricweighting may be, as indicated by context, equivalent ... path loss . In United States Department of Defense practice, Weighting filter unweighted measurement ... more details
In telecommunication s, the term received noise power has the following meanings 1. The calculated or measured noise power , within the Bandwidth signal processing bandwidth being used, at the receive end of a Telecommunication circuit circuit , channel communications channel , data link link , or system . 2. The absolute power of the noise measured or calculated at a receive point. Note The related bandwidth and the noise weighting must also be specified. 3. The value of noise power, from all sources, measured at the telephone line line terminals of telephone set s receiver. Note Either flat weighting or some other specific amplitude frequency characteristic or noise weighting characteristic must be associated with the measurement. FS1037C MS188 Category Telecommunications terms Category Noise telecomm term stub ... more details
Unreferenced date October 2007 Generation Recombination noise , or g r noise , is a type of electrical signal noise caused statistically by the fluctuation of the generation and Carrier generation and recombination recombination of electrons in semiconductor based photon detectors. See also Noise Noise audio residual low level hiss or hum Noise electronic related to electronic circuitry. Noise figure the ratio of the output noise power to attributable thermal noise. Signal noise in science, fluctuations in the signal being received. Thermal noise sets a fundamental lower limit to what can be measured. Weighting filter ITU R 468 noise weighting A weighting List of noise topics science stub Category Noise ... more details
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