DOsgram: Gabor transform

In RSEIS: Seismic Time Series Analysis Tools

Gabor transform

Description

Gabor transform with simple spectrum

Usage

DOsgram(Xamp, DT = 0.008, multi = 1, scale.def = 0,
 TWIN = 2, TSKIP = 0.2, PCTTAP = 0.05, PLOT=TRUE)

Arguments

Xamp	signal
DT	sample rate interval (s)
multi	Multiples of time window estimate
scale.def	scaling flag for plotting (0=raw, 1=log, 2=sqrt)
TWIN	time for window
TSKIP	time for skip
PCTTAP	percent of taper to apply to individual windows
PLOT	logical, TRUE=plot to device

Details

This is a non-interactive version of SPECT.drive.

Value

list

sig	input signal
dt	deltat
numfreqs	Number of frequencies output
wpars	input parameters list(Nfft=numfreqs, Ns=Ns, Nov=Nov, fl=fl, fh=fh)
DSPEC	spectrum image
freqs	output frequencies (y axis)
tims	output times (x-axis)

Author(s)

Jonathan M. Lees<[e-mail]>

References

Lees, J. M. and Park, J., 1995: Multiple-taper spectral analysis: A stand-alone C-subroutine, Computers and Geology, 21(2), 199-236.

See Also

evolMTM, evolfft, evolAR, plotevol

Examples

data(KH)
###   swig(KH)

Xamp  <-  KH$JSTR[[1]]
Xamp  <-  Xamp[57914:72989]

Nfft <- 1024   ###  fft length
Ns <- 512      ###  number of samples in a window
Nov <- 480    ###  number of samples of overlap per window
fl <- 0        ###  low frequency to return
fh <- 12     ###  high frequency to return


EV  <-  DOsgram(Xamp, DT = 0.008, multi = 1, scale.def = 0,
TWIN = 2, TSKIP = 0.2, PCTTAP = 0.05)

RSEIS documentation built on Sept. 13, 2024, 1:09 a.m.