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The Fourier transform relates the function's time domain, shown in red, to the function's frequency domain, shown in blue. The component frequencies, spread across the frequency spectrum, are represented as peaks in the frequency domain.

Time domain is the analysis of mathematical functions, physical signals or time series of economic or environmental data, with respect to time. In the time domain, the signal or function's value is known for all real numbers, for the case of continuous time, or at various separate instants in the case of discrete time. An oscilloscope is a tool commonly used to visualize real-world signals in the time domain. A time-domain graph shows how a signal changes with time, whereas a frequency-domain graph shows how much of the signal lies within each given frequency band over a range of frequencies.

Origin of term[edit]

The use of the contrasting terms time domain and frequency domain developed in US communication engineering in the late 1940s, with the terms appearing together without definition by 1949.[1] When an analysis uses the second or one of its multiples as a unit of measurement, then it is in the time domain. When analysis concerns the reciprocal units such as Hertz, then it is in the frequency domain.

See also[edit]


  1. ^ Y. W. Lee, T. P. Cheatham, Jr., and J. B. Wiesner (1949) The Application of Correlation Functions in the Detection of Small SIgnals in Noise, MIT Research Laboratory of Electronics, Technical Report No. 141.

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219 news items

Wed, 13 Aug 2014 10:56:27 -0700

Given URL is not allowed by the Application configuration.: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains.
ThomasNet News (press release) (blog)
Tue, 26 Aug 2014 05:22:30 -0700

August 26, 2014 - As user-extensible spectrum frequency domain analysis application solution, Option N8832A-001 extends capabilities of Infiniium and InfiniiVision real-time oscilloscopes by letting engineers acquire live signals and visualize them in ...
Wall Street Journal
Tue, 02 Sep 2014 08:06:23 -0700

A time-domain view that makes it easy to capture transient signal effects as well as select the desired measurement data. -- A real-time histogram display capability for quick statistical analysis of measurement data -- a capability previously only ...
Electronic Products & Technology
Tue, 02 Sep 2014 06:18:45 -0700

A battery operation mode eliminates the effect of any ac power noise on measurements and enables detection of previously hidden signals. A time-domain view that makes it easy to capture transient signal effects as well as select the desired measurement ...
Tue, 02 Sep 2014 05:37:34 -0700

The untested conductor was generated from a time-domain electromagnetic (TDEM) survey recently completed by Falco as part of its 2014 field exploration program. The large off-hole subvertical conductor lies about 400 metres below surface and may have ...
Junior Mining Network
Tue, 02 Sep 2014 04:03:45 -0700

The Bounta deposit was discovered while field validating one of the numerous targets identified from the airborne helicopter time domain electromagnetic and magnetic survey (HTEM) carried out in 2013. The surface expression of Bounta's HTEM anomaly ...
RF Globalnet (press release)
Thu, 21 Aug 2014 02:00:00 -0700

Keysight Technologies, Inc. recently announced the availability of a frequency domain analysis (FDA) option, the industry's first user-extensible spectrum frequency domain analysis application solution for real-time oscilloscopes. The FDA option ...
SatNews Publishers
Tue, 19 Aug 2014 22:15:00 -0700

[SatNews] ..." requires frequency domain analysis beyond the out-of-the-box application capabilities, customers can immediately customize and extend the solution to meet their unique testing needs.” Keysight Technologies, Inc. today announced the ...

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