Graphic 3 for SigmaPlot

FOURIER TRANSFORMS and SPECTRAL ESTIMATION

FOURIER RELATED FUNCTIONS

dft2d(...) - 2-D Forward Discrete Fourier Transform
idft2d(...) - 2-D Reverse Discrete Fourier Transform
welch(...) - Welch Spectral Averaging function
stft(...) - Short-time-Fourier-Transform function

EXAMPLE: WELCH SPECTRAL AVERAGING ON COMPLEX SIGNAL

fourier102

 

EXAMPLE: SHORT-TIME FOURIER TRANSFORM ON FM SIGNAL

fourier202

 

 

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