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Frequency Analysis

LabVIEW 2013 Help

Edition Date: June 2013

Part Number: 371361K-01

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Frequency Analysis

Frequency Analysis Basics

Differences between Frequency Domain and Time Domain
Parseval's Theorem

Fourier Transform and Discrete Fourier Transform

Fourier Transform
Discrete Fourier Transform (DFT)

Relationship between N Samples in the Frequency and Time Domains
Example of Calculating Discrete Fourier Transform
Magnitude and Phase Information
Frequency Spacing between DFT Samples

FFT Fundamentals

Computing Frequency Components
Fast FFT Sizes
Zero Padding
Real FFT and Complex FFT
Displaying Frequency Information from Transforms

Two-Sided and DC-Centered FFT

Mathematical Representation of a Two-Sided and DC-Centered FFT
Creating DC-Centered Spectra

Power Spectrum

Converting a Two-Sided Power Spectrum to a Single-Sided Power Spectrum
Loss of Phase Information

Computations on the Spectrum

Estimating Power and Frequency
Computing Noise Level and Power Spectral Density

Computing the Amplitude and Phase Spectrums

Calculating Amplitude in Vrms and Phase in Degrees

Frequency Response Function
Cross Power Spectrum
Frequency Response and Network Analysis

Frequency Response of a Network
Impulse Response Function of a Network
Coherence Function

Windowing and FFT
Common Measurement Averaging Modes

RMS Averaging
Vector Averaging
Peak Hold

Hilbert Transform

Hilbert Transform on an Analytic Signal
Hilbert Transform on an Oscillating Signal
Echo Detection and Hilbert Transform


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