lowpass.trf

来自「gsac程序包」· TRF 代码 · 共 29 行

.TH LOWPASS
.SH SUMMARY:
LowPass filter traces

LowPass [options] 

where options is one or more of the following:
[Butter ] [ Corner fc ] [ NPoles npoles ] [ Passes npass] 
.Sh INPUT:
Butter  : Butterworth filter
.br
Corner  : Corner frequency (R) range 0 - Nyquist
.br
NPoles  : Number of poles  (I) range 1 - 10
.br
Passes  : Number of passes (I) range 1 - 2
.Sh DESCRIPTION:
Lowpass filter using a BI-LINEAR Z-transformation implementation of
a lowpass filter. A bi-linear method is chosen since this is easily
implemented algebraically. Passes = 1 gives a causal filter while 
Passes = 2 gives a zero-phase filter with a 6db point at the corner 
frequency.
.Sh "HEADER VALUES SET:"
USER1 = permin, USER2=permax, where permin=1.0/filt_fh, and
permax= 0.01/(npts * dt) for use by sacmft96 adn sacpom96
.Sh "SEE ALSO:"
	HIGHPASS, BANDPASS, BANDREJECT