Description: In many practical situations, stationarity assumptions often can not be established, then we need to introduce the analysis and treatment of non-stationary signals or time-varying signal. Refers to the so-called time-varying statistical characteristics of the signal varies over time. Because of the nature of this signal, the conventional method of Fourier analysis is not satisfactory. For time-varying signal, the frequency domain characteristics of different understanding of time is close to critical, therefore, people tend to use time- varying signal frequency method described in conjunction with the description.
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