RSPEC Name
RSPEC Purpose
Compute an ensemble averaged frequency spectrum of real data.
Category
Calling Sequence
sxx = rspec(x,n,sr,[freq]) Inputs
x = input signal. in
If x has too few points, -1 is returned.
n = number of points to use in each transform in
May be arbitrary.
sr = sample rate in Hz (Def=1 Hz) in
Needed to get actual units.
Keyword Parameters
Keywords
OVERLAP=novr number of points to overlap spectra (Def=0).
ZEROPAD=zlen length to zero pad out to (def=no 0 pad).
N_ENSEMBLE=n returned # spectra ensemble averaged.
/ACCUMUALTE means accumulate the spectra, don't average.
/NOTES lists some additional comments.
Outputs
sxx = spectral density in units of x^2/Hz. out
First value is DC, last is Nyquist.
freq = optionally output frequency array. out
Common Blocks
rspec_com Notes
Notes: Restricted to one dimensional data only.
Reference
Modification History
B. L. Gotwols Oct. 11, 1990.
R. E. Sterner 7 Aug, 1991 --- return only 1-side (symetric)
R. D. Chapman 2 Dec, 1992 --- fixed common blk reference to hannratio
R. E. Sterner 1 Mar, 1993 --- tested for ntimes eq 0 sooner.
R. Sterner, 19 May, 1993 --- forced correct data types.
Rewrote from xspec.pro to get overlap.
R. Sterner, 23 Nov, 1993 --- Added /ACCUMULATE keyword
R. Sterner, 1994 Nov 10 --- Added ZEROPAD keyword.
Copyright (C) 1990, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.