ONO SOKKI - Basic Terms for FFT Analysis

This is a glossary of basic terms relating to FFT analysis and FFT analyzers. All the descriptions of terms are based on Ono Sokki FFT analyzers. Note that these descriptions may not apply to FFT analyzers from other manufacturers.

A	Aliasing (Aliasing Noise)
	Amplitude Probability Density Function
	Amplitude Probability Distributions Function
	Analysis Data Length
	Autocorrelation Function
	Averaging Summation averaging, normalize summation averaging Exponential averaging Peak hold Subtraction averaging Sweep averaging
B	Bode Diagram
C	Calibration Function (EU Function)
	Cepstrum
	Channel Delay Function
	Coherence Blanking Function
	Coherence Function
	Coherence Output Power
	Coincident Quadrature Diagram
	Correlation Function
	Crest Factor
	Cross-Correlation Function
	Cross Spectrum
	Curve Fitting
D	Damping Factor
D	Decibel (dB)
E	Energy Spectrum Density
F	Fourier Transform
	Frequency-Axis Differential/Integral
	Frequency Resolution
	Frequency Response Function
G	Group Delay
H	Harmonic Distortion
H	Hilbert Transform

I	Impulse Response
	Inverse Fourier Transform
	Isolation
L	Liftered Envelope
M	Modal Analysis
N	Nichols Diagram
N	Nyquist Diagram
O	Octave Analysis
	Open-Loop/Closed-Loop Operation
	Orbit
	Overall Value
	Overlap Processing
P	Phase Spectrum
	Power Spectrum
	Power Spectrum Density
R	Real-time Analysis
	Rotational Order Ratio Analysis
	Rotational Tracking Analysis
	Root Mean Square (RMS)
S	Sampling Theorem
S	Sound Intensity (SI) or Acoustic Intensity (AI)
T	Time-Axis Differential/Integral
	Time-Axis Waveform
	Time Waveform Statistical Calculation Mean value (MEAN) RMS value (RMS) Standard deviation (S.D.) Skewness (SKEWNESS) Kurtosis (KURTOSIS) Crest factor (CRESTFACTOR)
	Trigger Function
W	Wigner Distribution
W	Window (Time Window)
Z	Zooming Function