National Instruments Order Analysis Toolset - Manual (Page 59)

© 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 c
m, 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.
∞