butfilt {RSEIS}R Documentation

Butterworth filter

Description

design and apply butterworth low/high/band pass filters.

Usage

butfilt(a, fl, fh, deltat, type, proto)

Arguments

a vector signal
fl low frequency cut-off
fh high frequency cut-off
deltat sample rate, s
type type of filter, one of c("LP", "HP","BP" ,"BR" )
proto prototype, c("BU", "BE" , "C1" ,"C2")

Details

creation of butfilt is a described by the following arguments:

LP
low pass
HP
high pass
BP
band pass
BR
band reject
BU
Butterworth
BE
Bessel
C1
Chebyshev type 1
C2
Chebyshev type 2

Value

filtered time series

Author(s)

Jonathan M. Lees<jonathan.lees.edu>

Examples

data(CE1)

ts1 = CE1$y
zz = butfilt(ts1, 1, 15,  CE1$dt, "LP" ,  "BU")


[Package RSEIS version 2.1-4 Index]