welchwin  R Documentation 
Return the filter coefficients of a Welch window of length n
.
welchwin(n, method = c("symmetric", "periodic"))
n 
Window length, specified as a positive integer. 
method 
Character string. Window sampling method, specified as:

The Welch window is a polynomial window consisting of a single parabolic section:
w(k) = 1  (k / N  1)^2, n=0,1, ... n1
.
The optional argument specifies a "symmetric" window (the default) or a
"periodic" window. A symmetric window has zero at each end and maximum in the
middle, and the length must be an integer greater than 2. The variable
N
in the formula above is (n1)/2
. A periodic window wraps
around the cyclic interval 0,1, ... m1
, and is intended for use
with the DFT. The length must be an integer greater than 1. The variable
N
in the formula above is n/2
.
Welch window, returned as a vector.
Muthiah Annamalai, muthiah.annamalai@uta.edu,
Mike Gross, mike@appltech.com,
Peter V. Lanspeary, pvl@mecheng.adelaide.edu.au.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
w < welchwin(64) plot (w, type = "l", xlab = "Samples", ylab =" Amplitude") ws = welchwin(64,'symmetric') wp = welchwin(63,'periodic') plot (ws, type = "l", xlab = "Samples", ylab =" Amplitude") lines(wp, col="red")
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