On 10/01/2017 18:23, Bill Somerville wrote: > I suspect that MacLeod's estimator is not a simple replacement for > Joe's simple three ... point parabolic fit
Hi Mike, I should also point out, as I understand it, that the choice of window function and interpolating estimator for frequency finding are closely related. The window function will have a bearing on the curve shape of peaks, this is because the window function trades off DFT end point discontinuity with peak broadening. So for example if a window function that caused broadening with a Gaussian shape then a Gaussian curve fitting would be the best candidate for estimating inter-bin frequency peaks. It may be that a rectangular window i.e. no window function at all, has some matching inter-bin frequency estimator that performs best although I doubt it if there are other signals present in the spectrum of the DFT. Note that the FTol only applies to the search and does not eliminate artefacts caused by other signals. I can't make a suggestion for improvement but it is probably not productive to take it further with radio signals. 73 Bill G4WJS. ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
