Patent ID: 6484112
Filing Date: 2002-11-19
Classification: G01R,G06F

Abstract:
Method for estimation of the frequency of a timing signal by means of a discrete Fourier Transformation of the timing signal and interpolation between samples of the DFT spectrum, wherein the timing signal is filtered with a Hamming Window function, thereby characterized, that the interpolation is resolved according to a mathematically closed end solution, that the interpolation is resolved on the basis of the value ratio &agr; of the highest maximum Sw(l) and its adjacent maximum Sw(l+1) in the DFT Spectrum, Î±=|Sw&af;(l&PlusMinus;1)||Sw&af;(l)|wherein the correction distance d(âˆ’1Î±=|(-2+4&it;d-2&it;d2+a&CenterDot;(-2-8&it;d+4&it;d2))&CenterDot;(d+1)||-2&it;d+a&CenterDot;(4&it;d2-2)&CenterDot;(d-2)|and wherein the correction distance d is computed according to the solution for d, which is definite over the region 0&lE;&agr;&lE;1, of the relationship between &agr; and d.