TY - JOUR N2 - This paper is devoted to some problems that appear in derivations of the discrete time Fourier transform from a formula for its continuous time counterpart for transformation from the time into the frequency domain as well as to those regarding transformation in the inverse direction. In particular, the latter ones remained so far an unresolved problem. It is solved for the first time here. Many detailed explanations accompanying the solution found are presented. Finally, it is also worth noting that our derivations do not exploit any of such sophisticated mathematical tools as the so-called Dirac delta and Dirac comb. L1 - http://journals.pan.pl/Content/115212/PDF/48_2020.pdf L2 - http://journals.pan.pl/Content/115212 PY - 2020 IS - No 2 EP - 368 DO - 10.24425/ijet.2020.131885 KW - sampling of signals KW - relation between discrete and continuous time Fourier transforms A1 - Borys, Andrzej PB - Polish Academy of Sciences Committee of Electronics and Telecommunications VL - vol. 66 DA - 2020.06.25 T1 - On Derivation of Discrete Time Fourier Transform from Its Continuous Counterpart SP - 355 UR - http://journals.pan.pl/dlibra/publication/edition/115212 T2 - International Journal of Electronics and Telecommunications ER -