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Reference.org
Bilinear time–frequency distribution
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<p>Bilinear time–frequency distributions, or quadratic time–frequency distributions, arise in a sub-field of <a href="/facts/Signal_analysis/Npaja6zb">signal analysis</a> and <a href="/facts/Signal_processing/Npaja6zb">signal processing</a> called <a href="/facts/Time%25E2%2580%2593frequency_representation/b3BqBScJ">time–frequency signal processing</a>, and, in the <a href="/facts/Statistical_analysis/sJLjubxm">statistical analysis</a> of <a href="/facts/Time_series/fSXPR817">time series</a> data. Such methods are used where one needs to deal with a situation where the frequency composition of a signal may be changing over time; this sub-field used to be called time–frequency signal analysis, and is now more often called time–frequency signal processing due to the progress in using these methods to a wide range of signal-processing problems. </p>