Editing Time domain (section)

== Origin of term ==
The use of the contrasting terms ''time domain'' and ''[[frequency domain]]'' developed in U.S. [[communication engineering]] in the late 1940s, with the terms appearing together without definition by 1950.<ref>{{cite journal |first1=Y. W. |last1=Lee | first2=T. P. Jr. |last2=Cheatham |first3=J. B. |last3=Wiesner |year=1950 |title=Application of Correlation Analysis to the Detection of Periodic Signals in Noise |journal=Proceedings of the IRE |volume=38 |issue=10 |pages=1165–1171 |doi=10.1109/JRPROC.1950.233423 |s2cid=51671133 }}</ref>  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.