In  and some following publications, Tadmor and Gelb took up a well known property of conjugate Fourier series in 1-d, namely the property to detect jump discontinuities in given spectral data. In fact, this property of conjugate series is known for quite a long time. The research in papers around the year 1910 shows that there were also other means of detecting jumps observed and analysed. We review the classical results as well as the results of Gelb and Tadmor and demonstrate their discrete case using different estimates in all detail. It is worth noting that the techniques presented are not global but local techniques. Edges are a local phenomenon and can only be found appropriately by local means. Furthermore, applying a different approach in the proof of the main estimate leads to weaker preconditions in the discrete case. Finally an outlook to a two-dimensional approach based on the work of Móricz, in which jumps in the mixed second derivative of a 2-d function are detected, is made.
 A. Gelb and E. Tadmor, “Detection of Edges in Spectral Data,” Applied and Computational Harmonic Analysis, Vol. 7, No. 1, 1999, pp. 101-135.
 A. Gelb and E. Tadmor, “Detection of Edges in Spectral Data II. Nonlinear Enhancemen,” SIAM Journal on Numerical Analysis, Vol. 38, No. 4, 2000, pp. 1389-1408.
 E. Tadmor, “Filters, mollifiers and the computation of the Gibbs phenomenon,” Acta Numerica, Vol. 16, 2005, pp. 305-378. http://dx.doi.org/10.1017/S0962492906320016
 F. Móricz, “Extension of a Theorem of Ferenc Lukács from Single to Double Conjugate Series,” Journal of Mathematical Analysis and Applications, Vol. 259, 2001, pp. 582-595.
 M. Wirz, “Ein Spektrale-Differenzen-Verfahren mit modaler Filterung und zweidimensionaler Kantendetektierung mithilfe konjugierter Fourierreihen,” Dissertation, Cuvillier and TU Braunschweig, 2012.
 F. Móricz, “Approximation by Rectangular Partial Sums of Double Conjugate Fourier Series,” Journal of Approximation Theory, Vol. 103, 2000, pp. 130-150.
 V. L. Shapiro, “Fourier Series in Several Variables,” Bulletin of the AMS, Vol. 70, No. 1, 1964, pp. 48-93.