| kaiser {gsignal} | R Documentation |
Kaiser window
Description
Return the filter coefficients of a kaiser window of length n.
Usage
kaiser(n, beta = 0.5)
Arguments
n |
Window length, specified as a positive integer. |
beta |
Shape factor, specified as a positive real scalar. The parameter
|
Details
The Kaiser, or Kaiser-Bessel, window is a simple approximation of the DPSS window using Bessel functions, discovered by James Kaiser.
besselI(0, Beta * sqrt(1-(2*x/m)^2))
k(x) = -------------------------------------, -m/2 <= x <= m/2
besselO(0, Beta)
The variable parameter \beta determines the trade-off between main lobe
width and side lobe levels of the spectral leakage pattern. Increasing
\beta widens the main lobe and decreases the amplitude of the side
lobes (i.e., increases the attenuation).
Value
Kaiser window, returned as a vector.
Author(s)
Kurt Hornik, Kurt.Hornik@ci.tuwien.ac.at,
Paul Kienzle,
pkienzle@users.sf.net.
Conversion to R by Geert van Boxtel
G.J.M.vanBoxtel@gmail.com.
Examples
k <- kaiser(200, 2.5)
plot (k, type = "l", xlab = "Samples", ylab =" Amplitude")