![]() ![]() Harris, F.J., "On the use of windows for harmonic analysis with the discrete Fourier Transform", Proc, IEEE, 66, 51-83, 1978.Statement loads the Parzen, Welch, Kaiser, Hamming, BlackmanHarris3, and KaiserBessel functions which also window data without involving the FFT. Igor provides a standalone Hanning command to window data without involving the FFT. Throughout the article, the term measurement time refers to the amount of time to acquire a single average or FFT of data. Here is a demonstration of how windowing can improve the Fourier Transform result: Much research has been applied to the selection of the proper "windowing function", so Igor´s FFT supplies many of them:īartlett Blackman361, Blackman367, Blackman492, Blackman474 Cos1, Cos2, Cos3, Cos4 Hamming Hanning KaiserBessel20, KaiserBessel25, KaiserBessel30 Poisson2, Poisson3, Poisson4 Reimann The purpose is to reduce "leakage" aberrations in the FFT output that are introduced by sudden changes in the data at the start and end of data. Windowing premultiplies input data supplied to the FFT with a value that smoothly decreases to zero at each end of data. ![]() Wide-Angle Neutron Spin Echo Spectroscopy. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |