Guo, RuimingRuimingGuoTHIERRY BLU2024-03-072024-03-072023-11-0110535888https://scholars.lib.ntu.edu.tw/handle/123456789/640442This article introduces a simple formula that provides the exact frequency of a pure sinusoid from just two samples of its discrete-time Fourier transform (DTFT). Even when the signal is not a pure sinusoid, this formula still works in a very good approximation (optimally after a single refinement), paving the way for the high-resolution frequency tracking of quickly varying signals or simply improving the frequency resolution of the peaks of a discrete Fourier transform (DFT).journal article10.1109/MSP.2023.33115922-s2.0-85177223055https://api.elsevier.com/content/abstract/scopus_id/85177223055