R: Gabor Transform with AR spectrum method

doGABOR.AR {RSEIS} | R Documentation

## Gabor Transform with AR spectrum method

### Description

Gabor Transform with AR spectrum method

### Usage

    doGABOR.AR(Xamp, DT = 0.008, multi = 1, scale.def = 0, TWIN = 2, TSKIP =
    0.2, PCTTAP = 0.05, pord=100, 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
`pord` | order for the AR process (default=100)
`PLOT` | logical, TRUE=plot to device

### Details

This is a spectrogram function similar to the Gabor Transform but uses the AR method for spectrum estimation.

### 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
`HIMAT` | matrix with high values of F-test at 90 percent confidence
`freqs` | output frequencies (y axis)
`tims` | output times (x-axis)

### Note

The main difference between this and other similar calls is the way the windows are determined.

### Author(s)

Jonathan M. Lees<jonathan.lees@unc.edu>

### References

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

Percival, Donald B.,Walden, Andrew T. (1993):Spectral Analysis for Physical Applications,Cambridge University Press, Cambridge, 583p.

### See Also

evolfft, evolMTM, MTM.drive, GETARAIC, doGABOR.AR, DOsgram, doGABOR.MTM

### Examples

    data(KH)
    ###   swig(KH)

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

    EV <- doGABOR.AR(Xamp, DT = KH$dt[1] , multi = 1, scale.def = 0,
    TWIN = 2, TSKIP = 0.2, PCTTAP = 0.05)

[Package RSEIS version 3.7-4 Index]