© National Instruments Corporation G-1 LabVIEW Order Analysis Toolset User Manual
Glossary

Numbers/Symbols

Infinity.
2D Two-dimensional.

A

adaptive filter A type of filter that operates on a recursive algorithm to achieve the goal of
optimum. It is self-designing and suitable for tracking time variations of the
input signal, but complete knowledge of the relevant signal characteristics
is not available.
aliasing A phenomenon in which an analog signal of a frequency greater than half
the sampling frequency, or Nyquist frequency, appears after sampling at a
frequency less than half the sampling frequency. See also anti-aliasing filter
and Nyquist frequency.
anti-aliasing filter Analog lowpass filters used before analog-to-digital conversion to filter out
the frequencies greater than half the sampling frequency. See also aliasing
and Nyquist frequency.

C

critical sampling Occurs in Gabor transform when the window length equals the window
shift step. In critical sampling, the number of Gabor coefficients cm, n equals
the number of original data samples s[k].

D

dB Decibel.
dual functions Pair of window functions for Gabor transform and Gabor expansion. The
two dual functions are interchangeable. That is, you can use either of the
dual functions for a Gabor transform while using the other dual function for
a Gabor expansion.
∞