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There are many types of conjugate variables, depending on the type of work a certain system is doing (or is being subjected to). Examples of canonically conjugate variables include the following:
* Time and [[frequency]]: the longer a musical note is sustained, the more precisely we know its frequency, but it spans a longer duration and is thus a more-distributed event or 'instant' in time. Conversely, a very short musical note becomes just a click, and so is more temporally-localized, but one can't determine its frequency very accurately.<ref>{{Cite journal |last1=Mann |first1=S. |last2=Haykin |first2=S. |date=November 1995 |title=The chirplet transform: physical considerations |url=http://wearcam.org/chirplet.pdf |journal=IEEE Transactions on Signal Processing |volume=43 |issue=11 |pages=2745–2761 |doi=10.1109/78.482123|bibcode=1995ITSP...43.2745M
* [[Doppler effect|Doppler]] and [[slant range|range]]: the more we know about how far away a [[radar]] target is, the less we can know about the exact velocity of approach or retreat, and vice versa. In this case, the two dimensional function of doppler and range is known as a [[radar ambiguity function]] or '''radar ambiguity diagram'''.
* Surface energy: ''γ'' d''A'' (''γ'' = [[surface tension]]; ''A'' = surface area).
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