Frequency Analysis

You can use LabWindows/CVI to perform Discrete Fourier Transforms (DFT), Fast Fourier Transforms (FFT), basic signal analysis computations, computations on power spectra, and FFT-based calculations for network analysis.

The LabWindows/CVI Advanced Analysis Library includes the following frequency analysis functions:

Function Description
ChirpZT Calculates the z transform along a spiral in the z-plane at the specified points.
CreateFFTTable Creates a reusable FFT table.
CrossSpectrum Calculates the double-sided cross power spectrum of the input sequences.
CxChirpZT Calculates the z transform along a spiral in the z-plane at the following points.
CxFFT2D Computes the 2D Fast Fourier Transform (FFT) of a complex time-domain signal.
CxFFTEx Calculates the 1D Fast Fourier Transform (FFT) of a complex time-domain signal.
CxInvFFT2D Computes the complex 2D inverse Fast Fourier Transform (FFT) of a signal.
CxInvFFTEx Computes the complex inverse Fast Fourier Transform (FFT) of an input sequence.
DCT Computes the one-dimensional Discrete Cosine Transform (DCT) of the input sequence.
DCT2D Computes the two-dimensional Discrete Cosine Transform (DCT) of a matrix.
DestroyFFTTable Frees the resources used by an FFT table.
DST Computes the one-dimensional Discrete Sine Transform (DST) of an input sequence.
DST2D Computes the two-dimensional Discrete Sine Transform (DST) of a matrix.
FastHilbertTransform Computes the Fast Hilbert Transform of the input sequence.
FFT2D Computes the Fast Fourier Transform (FFT) of a 2D time-domain signal.
FFTEx Computes the Fast Fourier Transform (FFT) of a real time-domain signal.
FHT Calculates the Fast Hartley Transform (FHT).
InvDCT Computes the one-dimensional inverse Discrete Cosine Transform (DCT) of the input sequence.
InvDCT2D Computes the two-dimensional inverse Discrete Cosine Transform (DCT) of the input signal.
InvDST Computes the one-dimensional inverse Discrete Sine Transform (DST) of the input signal.
InvDST2D Computes the two-dimensional inverse Discrete Sine Transform (DST) of the input signal.
InvFastHilbertTransform Computes the inverse Fast Hilbert Transform of the input sequence.
InvFFT2D Computes the real two-dimensional inverse Fast Fourier Transform (FFT) of the input signal.
InvFFTEx Computes the real inverse Fast Fourier Transform (FFT) of an input sequence.
InvFHT Calculates the inverse Fast Hartley Transform (FHT).
Spectrum Calculates the power spectrum of the input array.