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Topic: Time domain

Related Topics

Frequency domain

Digital signal processing

Frequency spectrum

Spectrogram

Autocorrelation

PSOLA

Deconvolution

Signal processing

Power spectral density

Signal

Discrete Fourier transform

Window function

Convolution theorem

Audio signal processing

Analog signal processing

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	Time Domain
		The length of each cycle in time is called the period of the waveform because the shape of the waveform repeats periodically at this interval.
		The two sinusoids are identical except that they are differently aligned with respect to the time axis.
		That is, the pressure variations over time follow the form of a trigonometric sine or cosine function.
	www.asel.udel.edu /speech/tutorials/acoustics/time_domain.html (1775 words)

	TDR Circuit
		By timing the delay between the original pulse and the reflection it is possible to discern the point on the cable length where an anomaly exists.
		Time domain reflectometry (TDR) was originally developed by the power and communications industries to locate faults and breaks in cables.
		Time domain reflectometry (TDR) is a also used in geotechnical field instrumentation as a method of locating the depth to a shear plane or zone in a landslide.
	www.epanorama.net /circuits/tdr.html (5397 words)

	Technology
		The relationship between the time domain and the frequency domain is shown in the figure below.
		In other words, Time Domain theory is put into practice in order to provide an impulse response that is more closely matched to the actual impulse signal input.
		The purpose behind the use of time domain theory is to bring the impulse response as close as possible to the original impulse itself, eliminating any resonant components or undesirable harmonics.
	www.eclipse-td.com /e12_technology/technology1.html (443 words)

	EETimes.com - Tackling impulse UWB in frequency domain (Site not responding. Last check: 2007-10-13)
		A signal may be represented in either the frequency or the time domain, and communications systems normally reconstruct a signal from discrete samples in time.
		For example, with a 1-nanosecond time window for an I-UWB pulse with a 7-GHz bandwidth and 100-ns PRI, the resulting fundamental frequency is the inverse of the time window (1 GHz), and the harmonic frequencies are multiples of the fundamental frequency.
		In the time domain, the multiplication result is a correlation function that characterizes the channel impulse response with the arrival time of all multipath signals that exceed a threshold.
	www.eetimes.com /showArticle.jhtml?articleID=20300700 (1206 words)

	Time domain reflectometry
		Time Domain Reflectometry, or TDR, is an electrical measurement technique that has been used for many years to determine the spatial location and nature of various objects.
		Time Domain Reflectometry, or TDR, is a remote sensing electrical measurement technique that has been used for many years to determine the spatial location and nature of various objects.
		By measuring the time from the transmitted pulse until the echo returns and knowing the speed of light, the distance to the reflecting object may be easily calculated.
	www.iti.northwestern.edu /publications/tdr/1994_papers/pico.html (2238 words)

	Time Domain Electromagnetics
		Time Domain ElectroMagnetic induction (TDEM) involves generating an electromagnetic field which induces a series of currents in the earth at increasing depths over time.
		Measurements of the magnetic field are typically made in the time range from 10 micro-seconds to 10 milli-seconds following the “turn-off” of the primary field.
		Measurements are made in 20 to 30 discrete “time gates”, or time intervals, following the current pulse generated by the transmitter.
	www.nga.com /Geo_ser_EM(TDEM).htm (396 words)

	Time Domain
		The time domain is a good indicator of gear problems, especially broken teeth.
		This also is positive proof that time domain spectrums must be taken on all units, which are in a vibration health care program for rotating equipment.
		Time domain spectrums are also useful in determining bearing defects on slow rpm machines.
	equipmenthealth.com /new_page_2.htm (432 words)

	Time Domain Questions
		What this does is to use the frequency domain added mass and damping matrices at the period xx for the solution in the time domain, and not the convolution.
		The periods specified on &env are used to synthesize the forces on the vessel in the time domain and those specified on g_press are used to compute frequency domain data which is also used in the time domain.
		If computation time is excessive, (you have a diffraction mesh with a large number of panels) you may remove some of the periods for the g_press command without compromising accuracy.
	www.ultramarine.com /hdesk/question/time.htm (2444 words)

	Domain Time II Time Synchronization Software - Symmetricom
		Domain Time II incorporates and tracks multiple types of data that verify exactly who synchronized from whom, when, and what were the actual adjustments were.
		Domain Time II Manager is an integrated suite of Windows NT/2K/XP applications and services that allow you to remotely install, configure, control, and monitor your Domain Time II components across the network.
		Domain Time II Server is an Windows NT/2K/XP system service that is configured to obtain time from an a GPS referenced network time server such as a Symmetricom SyncServer® S200, and then distribute that time reliably and securely to other client machines that run the Domain Time II Client.
	www.ntp-systems.com /product_software.asp (922 words)

	Teachers' Domain: Deep Time
		Now ask students to think of the geologic time scale in terms of a calendar year, that is, 4.6 billion years of Earth's history as equivalent to twelve months.
		If the geologic time scale were represented by one year, then the Carboniferous period was just five days long, occurring between December 3 and December 8.
		Finally, starting with the month of January, have each student shout out his or her time period along with one thing that the time period is known for -- to create a live-action student timeline.
	www.teachersdomain.org /9-12/sci/life/evo/lp_deeptime/index.html (781 words)

	4.5 Linear System Filtering in Time and Frequency Domain (Site not responding. Last check: 2007-10-13)
		Correspondingly, ideal pass band filtering, clearly visualized in the frequency, domain is not nearly so easy to "see" in the time (or space) domain where it is a convolution.
		These two properties of linearity and time invariance are the basis for the "amazing" conclusion (Papoulis, 1962) that such a "linear system" is uniquely determined by a single function, h(t) called the impulse response function (equation 4.1a and Figure 4.4).
		Once we've established the differentiation operation in frequency domain, we also magically have derived the expression in the frequency domain for the operation of integration.
	www-rohan.sdsu.edu /~jiracek/digital/filtering/linearsystem.html (895 words)

	Finite Difference Time Domain (FDTD) Technique
		This results in the basic FDTD equation that the new value of the E field is dependent on the old value of the E field (hence the difference in time) and the difference in the old value of the H field on either side of the E field point in space.
		The new value of the H field is dependent on the old value of the H field (hence the difference in time), and also dependent on the difference in the E field on either side of the H field point.
		FDTD is a time domain technique, and when a time-domain pulse (such as a Gaussian pulse) is used as the source pulse, then a wide frequency range is solved with only one simulation.
	www.pas.rochester.edu /~icpark/Vinos/whatisfdtd.html (936 words)

	Time Domain Reflectometry
		A TDR measures the time that it takes for the energy to return and the size of the energy returning.
		The system rise time will set the case for what the smallest impedance reflection (discontinuity) can be detected.
		This system rise time is the combined rise time of the pulse generator, the oscilloscope, the interconnect from the instrumentation to the device, and the device.
	www.dcoax.com /tutorial/timedomain.html (538 words)

	Setting The Time Domain
		The time domain settings determine the range of values that are downloaded from the database.
		Time domain settings for each highlighted mnemonic in the Selected Mnemonics list are visible in the scrollable text window in the center of the page.
		The number of mnemonics that have their time domains set is shown in the Counts area on this page.
	radlab.gsfc.nasa.gov /DataAnalysis/Setting_The_Time_Domain.htm (355 words)

	Time Domain Technology : How It Works
		It reveals all the sounds recorded at the source, and it conveys them exactly as they were recorded to deliver a pristine and complete audio experience.
		To express Time Domain theory in more technical terms, the main priority of conventional speakers is to improve the amplitude-frequency characteristics, which does not result in any real enhancement of the phase-frequency characteristics.
		We believe that with the wider recognition of Time Domain theory and an increasing demand for excellent audio, recording technologies themselves will undergo some dramatic changes in the years ahead so that the sound recordings produced by the music industry will be equal to the quality delivered by TimeDomain speakers.
	www.timedomainusa.com /technology.htm (694 words)

	Time Domain Corp. : Technology Overview
		The medium does require precise pulse placement in time (pulses are positioned with an accuracy of trillionths of a second), and it also requires a coherent correlating receiver - a Fullerton correlator.
		Conventional signals transmitted in the frequency domain are highly "visible" electronically because all the power is packed into a narrow bandwidth, for example: 1 watt over 1 MHz.
		Time Modulation transmits millions of unstructured coded monocycles (cyclets) per second with emissions indistinguishable from noise and across an ultra wideband - yielding a virtually undetected communications link.
	www.acadia.org /competition-98/sites/integrus.com/html/library/tech/www.time-domain.com/technology.html (351 words)

	Domain Time II Server: Broadcast Time Tab Page
		By default, Domain Time II Server only uses network broadcasts to send cascade and advisory messages to Slaves and Clients to ensure time is propagated correctly throughout the network.
		Domain Time II uses a highly efficient time distribution hierarchy to ensure that time is distributed and updated extremely accurately across the network.
		Time sync data is included in the Heartbeat broadcast packet itself, and a Client will immediately set its time to match the packet.
	greyware.com /software/domaintime/instructions/server/broadcasts.asp (877 words)

	Agilent Technologies \| Educator's Corner - Resource Guide for Engineering Educators \| Time Domain vs. Frequency Domain
		The three-dimensional plot of frequency, amplitude and time that shows the relationship between the time and frequency domains.
		What you see is an oscilloscopes view of the waveform (amplitude vs. time), which is really the vector sum of all of the sinusoidal components vs. time.
		Depending upon the type of spectrum analyzer chosen, the phase relationships of the frequency components may or may not be preserved.
	www.educatorscorner.com /index.cgi?CONTENT_ID=2489 (343 words)

	TDR: Time-Domain Reflectometery
		The TDR100 (1) generates a very short rise time electro-magnetic pulse that is applied to a coaxial system which includes a TDR probe for soil water measurements and (2) samples and digitizes the resulting reflection waveform for analysis or storage.
		The elapsed travel time and pulse reflection amplitude contain information used by the on-board processor to quickly and accurately determine soil volumetric water content, soil bulk electrical conductivity, rock mass deformation or user-specific, time-domain measurement.
		Time Domain Reflectometry is used to detect deformation within a rock mass.
	www.campbellsci.com /tdr (944 words)

	NET TIME /Domain Will Not Sync Time with Domain Time Source Server
		When the /DOMAIN switch is used with the NET TIME command, the computer sending the command does a NetGetDcName to determine the PDC of the domain.
		For example, all servers in a resource domain may be required to synchronize their time with the master account domain's time source server or servers.
		When NET TIME /SET is sent without the /DOMAIN switch, the computer will obtain a browse list for the domain in which it is a member, select a time source server from the list, and then send a NetrRemoteTOD call to synchronize the time.
	support.microsoft.com /support/kb/articles/q193/8/25.asp (552 words)

	Domain Time II
		Domain Time II is a complete network time synchronization system, consisting of high-performance time servers, clients, management tools, and auditing utilities.
		Domain Time II servers obtain time from GPS receivers or public time servers and then distribute that time accurately and verifiably using popular time protocols.
		Domain Time II is simply the most professional, comprehensive, and technically advanced network time solution available.
	www.greyware.com /software/domaintime (219 words)

	Time-domain reflectometry
		The technique used in time-domain reflectometry consists of feeding an impulse of energy into the system and then observing that energy as it is reflected by the system at the point of insertion.
		When the fast-rise input pulse meets with a discontinuity or impedance mismatch, the resultant reflections appearing at the feed point are compared in phase, time, and amplitude with the original pulse.
		Also, since distance is related to time and the amplitude of the reflected step is directly related to impedance, the comparison indicates the distance to the fault as well as the nature of the fault.
	www.tpub.com /neets/book21/90e.htm (624 words)

	Time Domain Pitch Correction
		Second, the computational complexity is much less for time domain algorithm because there is no need to take transforms of the data.
		Two different algorithms were created and utilized with the major difference being the way in which the section of signal that is to be overlapped and added is selected.
		The graph on the left is about two periods from the original signal, whereas the graph on the right shows the output signal during the same time interval for both the PSOLA (red) and time-shifting algorithms (blue).
	cnx.org /content/m11711/latest (1291 words)

	Discrete-Time Systems in the Time-Domain
		In the frequency domain, delaying a signal corresponds to a linear phase shift of the signal's discrete-time Fourier transform: (s(n−n
		Certainly, the difference equation would not describe a linear system if the input that is zero for all time did not produce a zero output.
		Here, n indexes the times at which compounding occurs (daily, monthly, etc.), a equals the compound interest rate plusone, and b=1 (the bank provides no gain).
	cnx.org /content/m10251/latest (1306 words)

	Time Domain Representations (Site not responding. Last check: 2007-10-13)
		This chapter discusses several time-domain representations for digital filters, including the difference equation, system diagram, and impulse response of a system is its output signal in response to the impulse signal.
		In continuous time, the impulse is a narrow, unit-area pulse (ideally infinitely narrow).
		Additionally, the convolution representation for LTI filters is derived, and the special case of Finite Impulse Response (FIR) digital filter has an impulse response that reaches zero in a finite number of samples.
	ccrma-www.stanford.edu /~jos/filters/Time_Domain_Filter_Representations.html (173 words)

	The Calculation of Time Domain Frequency
		Specialized calculations are necessary to express the results of time domain frequency stability measurements [1, 2, 3].
		The time domain stability of a frequency source can be measured by either phase or frequency data.
		While time tagging may be needed for archival storage of clock measurements, a vector of extracted gap-filled data data is sufficient for analysis.
	www.ieee-uffc.org /freqcontrol/paper1ht.html (3604 words)

	Hasbrouck Geophysics, Inc.: Groundwater Plume (Time Domain Electromagnetics) (Site not responding. Last check: 2007-10-13)
		A groundwater plume containing anomalously high total dissolved solids is present at a depth of about 20 feet and generally extends in a southwestern trend from an uranium mill tailings cell in the southwestern U.S. The time domain electromagnetic (TDEM) geophysical method provides a measurement of the subsurface conductivity (or its inverse, resistivity).
		The formation resistivity of a saturated layer with relatively large amounts of dissolved solids will be fairly low (and, thus, conductivity will be high) and identification of such anomalous zones is possible with the TDEM method.
		In addition to acquiring additional TDEM data, refraction seismic data were also proposed to be acquired in specific areas to confirm or deny the presence of a limestone deposit.
	www.hasgeo.com /tdem.htm (456 words)

	Domain Time II Audit Server (Site not responding. Last check: 2007-10-13)
		Domain Time II Audit Server is a Windows NT/2K/XP/2003/Vista system service that automatically collects detailed time sync records and logs from machines on your network to create a complete and secure audit trail of your network's time.
		Audit Server can also be configured remotely using Domain Time II Manager (included with the Domain Time II Management Tools package).
		You may also launch the Domain Time II Audit Server applet (and many other installed Domain Time II components) by right-clicking on the Domain Time icon in the System Tray to bring up the context menu.
	dtdocs.ntp-systems.com /software/domaintime/instructions/audit/documentation.asp (332 words)

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