Now because the principle of stationary phase shows that there is a direct relationship between elapsed time and the instantaneous signal delay then, for the Hamming window, t / T can be related to / by
2.
Major advances in the subject were " Van der Corput's method " ( c . 1920 ), related to the principle of stationary phase, and the later " Vinogradov method " ( c . 1930 ).
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