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Topic: Transfer-function

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Transfer of Function Transfer of function does not necessarily mean that a function is physically being relocated - it may involve transferring the function from one agency to another agency, such as the mass transfer of National Biological Survey to USGS. The transfer of function (TOF) provisions deal with the right of employees to accompany their work when it is moved to a different competitive area or geographic location. The transfer of the performance of a continuing function from one competitive area and its addition to one or more other competitive areas; except when the function involved is virtually identical to functions already being performed in the other competitive area(s); or, www.doi.gov /hrm/pmanager/st16f.html   (188 words)

Transfer function - Encyclopedia.WorldSearch The transfer function is commonly used in the analysis of single-input single-output analog electrical circuits. A transfer function is a mathematical representation of the relation between the input and output of a linear time-invariant system. The transfer function can also be shown using the Fourier transform which is a special case of the bilateral Laplace transform for the case where encyclopedia.worldsearch.com /transfer_function.htm   (494 words)

Head-related transfer function - Wikipedia, the free encyclopedia Linear systems analysis defines the transfer function as the complex ratio between the output signal spectrum and the input signal spectrum as a function of frequency. Less specific descriptions include the pinna transfer function, the outer ear transfer function, the pinna response, directional transfer function DTF or what is commonly termed the head-related transfer function HRTF. Other terms include free-field to eardrum transfer function and the pressure transformation from the free-field to the eardrum. en.wikipedia.org /wiki/Head-related_transfer_function   (509 words)

Nikon MicroscopyU: Modulation Transfer Function Therefore, the optical transfer function is a spatial frequency-dependent complex variable whose modulus is the modulation transfer function, and whose phase is described by the phase transfer function. The modulation transfer function is also related to the point spread function, which is the image of a point source of light (commonly referred to as the Airy disk) from the specimen projected by the microscope objective onto the intermediate image plane. In this case, however, the point spread function is replaced by the time response to a very short electrical impulse, and the optical transfer function is replaced by the imaging system's response to the sinusoidal electrical signal with respect to amplitude and phase. www.microscopyu.com /articles/optics/mtfintro.html   (4055 words)

Transfer Functions The circuit's function is thus summarized by the transfer function. Implicit in using the transfer function is that the input is a complex exponential, and the output is also a complex exponential having the same frequency. The circuit's output to a sinusoidal input is also a sinusoid, having a gain equal to the magnitude of the circuit's transfer function evaluated at the source frequency and a phase equal to the phase of the transfer function at the source frequency. cnx.rice.edu /content/m0028/latest   (931 words)

Mastering Transfer Function Specification by using VolumePro Technology When transfer function contributions (peaks) are displayed in the user interface, the numerical properties of a peak (center and width) are shown by plotted markers on this range bar, giving the user a hint, where the contribution he is investigating is located in the data domain. During the rendering procedure the transfer function is evaluated for specific data values in order to gather the contribution of certain voxels or sampled locations to the resulting visualisation. Note, that not only the final transfer function will be used for the display, but also transfer functions composed by the partially defined contributions from the domains (like certain data only, coloured data regions only, and finally the composed transfer function). www.cgg.ru /oct/MTF.htm   (4271 words)

ECGSIM Manual: Transfer function The function displayed (a row of the transfer matrix) is the transfer from all points on the heart surface to the selected node on the thorax. The transfer function used in ECGSIM has been computed for a heart-thorax model, including the inhomogeneities caused by the higher conductivity of blood in the cavities and the lower conductivity of the lungs. The function displayed (a column of the transfer matrix) is the transfer to all points on the thorax from the node selected on the heart surface. www.ecgsim.org /help/transfer.html   (292 words)

Nikon MicroscopyU: Specimen Contrast in Optical Microscopy The modulation transfer function is a quantitative indicator of the ability of the microscope to transfer information from the specimen to the image. Furthermore, the modulation transfer function (MTF) and contrast-generating mode of the microscope significantly affects specimen contrast. The primary function of the microscope is to increase the size and resolve minute specimen details, but this act must be accomplished with sufficient contrast to render the specimen visible to the detector (a digital or traditional camera or the human eye). www.microscopyu.com /articles/formulas/specimencontrast.html   (5471 words)

RC Low Pass Transfer Function Computations As with the estimation of the transfer function, evaluation of Equation 26 is done with complex arithmetic. The processing to first estimate a behavioral transfer function from time series reinforcement and response rate data as well as the use of transfer function to predict behavior is shown in Figure 1. The prediction of the RC low pass filter's output based on the numerical estimate of the transfer function in Figure 1 given a three pulse input is straightforward. www.jsu.edu /depart/psychology/sebac/low-pass   (3385 words)

The transfer function Rational transfer functions can therefore be specified with a limited number of numerical coefficients, by listing either the the complex poles and zeros or the real polynomial coefficients. Transfer functions of seismometers and also of a wide class of other mechanical and analog electronic systems are rational functions of frequency with real coefficients: When their poles and zeroes or other mathematical properties are discussed, it is important to state which one of the functions is meant. www.geophys.uni-stuttgart.de /seismometry/hbk_html/node17.html   (665 words)

Transfer Function Representations A scalar transfer function is represented as a This is a transfer function in the variable This is the transfer function representation of a two-input, one-output system. documents.wolfram.com /applications/control/DescriptionofDynamicSystems/3.1.html   (751 words)

Definition: transfer function An example of a complex transfer function is envelope delay distortion. Note 2: Examples of simple transfer functions are voltage gains, reflection coefficients, transmission coefficients, and efficiency ratios. Of an optical fiber, the complex mathematical function that expresses the ratio of the variation, as a function of modulation frequency, of the instantaneous power of the optical signal at the output of the fiber, to the instantaneous power of the optical signal that is launched into the fiber. www.atis.org /tg2k/_transfer_function.html   (252 words)

Section 4.2. Human vocal tract transfer function calculations The transfer functions are also stable, with the magnitude decreasing and finite at both 0 Hz and 5000 Hz. Matlab 5.1’s routine arx.m was used, which calculates a transfer function given the input and output of the system, and the number of poles, zeros, and the delay. Now that we have an excitation function for the system, we may calculate the transfer function for the vocal tract. speech.llnl.gov /thesis/4_2.htm   (669 words)

Transfer function design However, the transfer function mapping is limited mostly to one scalar voxel value (or also to its first and second derivatives) at each sample point. The crucial part of volume rendering is the transfer function, which assigns opacity and color values to each voxel in the data. The evaluation of "goodness" of a transfer function is based either on a user decision (binary selection) or automatically exploiting feedback from resulting image. www.vrvis.at /vis/resources/DA-MMlejnek/node11.html   (339 words)

Introduction The transfer function is different for each combination of parameters employed and is seen to show a general trend consistent with the damping and stiffness characteristics of the medium of travel. A transfer function is somewhat like a filter that is applied to an incoming wave to produce an output signal. The relationship below for the transfer function is applicable to only standing waves, which are produced by the constructive interference of two waves travelling in opposite directions. octavia.ce.washington.edu /DrLayer/Exercises/L-TFunction.htm   (628 words)

transfer function With a crystal defined, the transfer function window can be used to identify the spatial frequencies that the microscope transmits for a given set of adjustment parameters. Figure 5.3 shows the Coherent Transfer Function, the spatial, temporal envelopes and their product, the objective aperture and the (h,k,l) reflections of the ZOLZ for a [2,1,0] direction. The transfer function menu item Drawing-Transfer function (Alt-D + Ctrl-T) opens the window shown on figure 5.1 when a crystal structure is not yet defined. cimewww.epfl.ch /people/stadelmann/jemswebsite/TransferFunction.html   (301 words)

Pole-Zero Transfer Function Responses for MELT OBS's and Standards The correct transfer function is an integral part of any worthwhile data set and care should be taken that the relevant version be archived with the data. Below is a table accessing the transfer functions for the MELT instruments and the Strekiesen and PMD standards we used in the vault for comparison. The pole-zero files reported here correspond to the "expected" transfer function, by which, we mean the transfer function derived from an analysis of the electronics and the reported seismometer parameters. www-mpl.ucsd.edu /obs/reports/tn061/comparison/pz.html   (282 words)

Transfer Function One also uses the transfer function to generate different implementation forms such as cascade or parallel combinations of smaller filters to achieve the same overall filter. Note that these two properties of the z transform are all we really need to find the transfer function of any linear, time-invariant digital filter from its difference equation (its implementation formula in the time domain). As we cover in Chapter 6, the transfer function of a digital filter is defined as ccrma-www.stanford.edu /~jos/filters/Transfer_Function.html   (269 words)

Hs.html # Hs.p --- Gnuplot script to plot the transfer function of an LTI# dynamic system in the s-plane # The system is two coupled oscillators set dummy g,w # independent variables... www.duke.edu /~hpgavin/ce283/Hs.html   (32 words)

Genetic Ablation of Phosphatidylinositol Transfer Protein Function in Murine Embryonic Stem Cells -- Alb et al. 13 (3): 739 -- Molecular Biology of the Cell in that it catalyzes the in vitro transfer of PtdIns, Functional analyses of yeast Sec14p reveal a role for this protein in regulating the interface between PtdCho metabolism and does not uniquely execute an essential housekeeping function in www.molbiolcell.org /cgi/content/full/13/3/739   (6773 words)

Cardiovascular Fluctuations and Transfer Function Analysis in Stable Preterm Infants -- ANDRIESSEN et al. 53 (1): 89 -- Pediatric Research The magnitude of the transfer function (BR gain/sensitivity). Transfer function parameters of the same infant as in Figure 1. and assessing the transfer function (BR gain/sensitivity and www.pedresearch.org /cgi/content/full/53/1/89   (4758 words)

Image-Based Transfer Function Design for Data Exploration in Volume Visualization Transfer function design is an integrated component in volume visualization and data exploration. The model defines a transfer function as a sequence of 3D image processing procedures, and allows the users to adjust a set of qualitative and descriptive parameters to achieve their subjective visualization goals. A goal-oriented and parameterized transfer function model is, therefore, crucial in guiding the transfer function searching process for better and more meaningful visualization results. csdl2.computer.org /persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/vis/1998/9176/00/9176toc.xml&DOI=10.1109/VISUAL.1998.745319   (247 words)

Univariate Transfer Function Identification In order to have the transfer function allow only finite incremental changes in the output series (if the input series undergoes a finite change), the model must be checked for stability. If one is concerned with identifying a transfer function relationship between the input and output variable, and if the input variable is not a white noise series, a prewhitening step should precede the computation of a cross correlation function (CCF). Obviously a transfer function model depends on the parameters r, s, and b (c.q. www.xycoon.com /tf_identification.htm   (814 words)

Type number of a transfer function? Just because the "transfer function" has s's in it, doesn't necessarily mean it is the proper function to be assessing the "number" of the system. Your transfer function has three poles and one zero so there are no integrators and it is a Type 0 transfer function. Suppose a transfer function is G(s)= (s+4)/[(s+2)(s+3)] for example. www.control.com /1026204889/index_html   (418 words)

Transfer function analysis of heart rate variability in response to water intake: correlation with gastric myoelectrical activity -- Chen et al. 96 (6): 2226 -- Journal of Applied Physiology Transfer function analysis of heart rate variability in response to water intake: correlation with gastric myoelectrical activity -- Chen et al. Articles by Chen, C. Articles by Kuo, T. Transfer function analysis of heart rate variability in response to water intake: correlation with gastric myoelectrical activity transfer function after water intake (P < 0.05). www.jap.org /cgi/content/abstract/96/6/2226   (271 words)

Transfer Function Analysis Transfer function analysis calculates the small-signal DC transfer function from a specified input source to a specified output expression. Depending upon the input source and the output expression the transfer function calculated can be: www.spectrum-soft.com /demo/transfer.shtm   (83 words)

1999 Fire Publications - DMA Transfer Function With Brownian Motion: A Trajectory/Monte-Carlo Approach. The range of validity of the Stolzenburg analysis is assessed by comparing his transfer function, the peak of his transfer function, and its dimensionless width with similar calculations based on the Monte-Carlo. It is shown that Stolzenburg's approximate formula for the standard deviation of the width of the transfer function agrees with Monte-Carlo simulations for particle sizes of 3 nm and larger. The transfer function for the Differential Mobility Analyzer (DMA) is derived based on particle trajectories for both nondiffusing particles and diffusing particles. fire.nist.gov /bfrlpubs/fire99/art011.html   (216 words)

The transfer function of a WWSSN-LP seismograph While the transfer function is insensitive to arbitrary factorization, the hardware may be quite sensitive, and certain engineering rules must be observed when a given transfer function is realized in hardware. 31), the transfer function of an electromagnetic seismometer (input: displacement, output: voltage) is (18) is a factorized form of the transfer function in which we still recognize the subunits of the system. www.geophys.uni-stuttgart.de /seismometry/man_html/node10.html   (1002 words)

New Tkabber function: file transfer Tkabber Tkabber first introduced file transfer support in july 2002, but on that time the JEPs were not approved by the JSF and it was hard to make a transference between different clients. Now file transfer is a reality in Jabber, with some of the most important clients fully supporting it and more clients to come. The set of required JEPs has taken a lot of time to be written, a lot of discussions and a lot of hard work from their writers and contributors, but they were finally approved by the Jabber Software Foundation Council around October 2003. tkabber.jabber.ru /node/view/110   (812 words)

Transfer Function Analysis It remains to define ``z transform'', and to prove that the z transform of the impulse response always gives the transfer function, which we will do by proving the convolution theorem for z transforms. The transfer function provides an algebraic representation of a linear, time-invariant (LTI) filter in the frequency domain: This chapter discusses filter transfer functions and associated analysis. ccrma.stanford.edu /~jos/filters/Transfer_Function_Analysis.html   (124 words)

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