Transforms and Spectrum Analysis

DCMPLXFFT Procedure

Double-precision complex fast Fourier transform

FFTCOMP Function

Fast Fourier transform

FFTINIT Function

Fast Fourier transform initialization

HILBERT Function

Constructs a Hilbert transformation

SPECTROGRAM Function

Spectrogram or short-time Fourier transform analysis

SPECTRUM Function

Power spectrum analysis (power spectral density)

WAVELET Function

Wavelet transform