Abstract
Normally Time-Frequency analysis is done by sliding a window through the time domain data and computing the Fourier Transform of the data within the window. The choice of the window length determines whether specular or resonant information will be emphasized. A narrow window will isolate specular reflections but will not be wide enough to accommodate the slowly varying global resonances; a wide window cannot temporally separate resonance and specular information. So we will adapt window length according to changes in frequencies. In this case we are realizing the specifications of Linear Frequency Modulation (LFM) signal. Index Terms—LFM, FFT, DFT, STFT and ASTFT.
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