Measurement of Time Spectra of Discrete Signals on Finite Intervals

A new form of discrete Fourier transform - a discrete-frequency Fourier transform (DFFT) - is introduced. It is proved that the original discrete information signal is not the only possible time spectrum of the original discrete measuring signal. It is shown that the absence of an answer to the question about the values of the time spectrum defined by the weighted DFFT within the values of the original digital measurement signal, creates an effect called by the authors as the “stockade effect in the time domain”.