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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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Tue, 15 Jul 2014 05:22:30 -0700

Time Domain provides small, low-power UWB ranging radio and radar sensors that wirelessly measure distance, send data and detect people and other objects. The company was most recently led by Nashville-based Pharos Capital Group. Time Domain ...
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Thu, 17 Jul 2014 09:20:09 -0700

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Mon, 14 Jul 2014 22:48:45 -0700

The latest addition to AFL's M-series optical time-domain reflectometer (OTDR) family – the large screened M710-40 – has been given TruEvent advanced analysis as well as optics that provide 44/42 dB of dynamic range at 1310/1550 nm. This is AFL's ...
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This suits modern airborne geological mapping techniques like VTEM (versatile time-domain electromagnetic system) used for identifying electromagnetic conductors such as semi-massive to massive sulphide mineralisation. NAN has flown more than 5,700 ...
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A Versatile Time Domain Electromagnetic (VTEM) geophysical survey has been completed over the majority of the Nachingwea Property, targeting nickel sulphides, and has identified numerous anomalies which are likely to be associated with graphite ...
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Tue, 22 Jul 2014 16:29:31 -0700

... Port News first published its gloss version of the PropertyGuide on August 5, 2005 before the publication was rebranded under the Domain masthead in 2007. In that time, Domain has become one of Fairfax Media's strongest brands in both print and online.

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Wed, 23 Jul 2014 13:48:45 -0700

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