__init__ (
        self,
        filtertype='bp',
        fc1=0.0,
        fc2=0.5,
        n=None,
        )

Constructor for the class LanczosFilter

Initialize the variables to hold the needed data The filter works as follows, first, it gets the coefficients to be used to weight each record performing a recursive filtering on the impulse response function Next, filter the records by means of a running buffer which is weighted using the weights... and that's all

Optional Arguments:

filtertype

String identifying the filter type. lp for low-pass filter, hp for high-pass filter and bp for band-pass filter.

fc1

First cutoff frequency (in inverse time steps). Defaults to 0.0

fc2

Second cutoff frequency (in inverse time steps). Defaults to 0.5

n

Number of points for the filter. This number of points will be missed at the beginning and at the end of the raw record. Defaults to a number a 30% higher than that recomended for secure band-pass filtering by Duchon (1979).

NOTE: With the default arguments the filter does NOT filter at all. It performs a band-pass filtering for all frequencies.

NOTE 2: If the first and second cutoff frequencies are different band-pass filtering is assumed even though lp or hp filtertype were selected.

getcoefs ( self )

Filter coefficients

prettyprintcoefs ( self )

Pretty-print the coefficients