Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Bilinear time-frequency distributions, or quadratic time-frequency distributions, arise in a sub-field field of signal analysis and signal processing called time-frequency signal processing, and, in the statistical analysis of time series 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

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