bandpass.help

gsac程序包

GSAC Command Reference Manual                                BANDPASS

SUMMARY:
BandPass filter traces

BandPass [options] 

where options is one or more of the following:

[Butter ] [ Corner fl  fh] [ NPoles npoles ] [ Passes npass] 

INPUT:
       Butter  : Butterworth filter

       Corner  : Corner frequencies (R) range 0 - Nyquist

       NPoles  : Number of poles  (I) range 1 - 10

       Passes  : Number of passes (I) range 1 - 2

DESCRIPTION:
     Highpass filter using a BI-LINEAR Z-transformation implementation of
a highpass 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.

EXAMPLES:
Bandpass with corner frequencies at 1 and 10 Hz, zero phase, 2-pole
     BP C 1 10 P 2 NP 2

HEADER VALUES SET
	USER1 = permin, USER2=permax, where permin=1.0/(filt_fh), and
	permax= 1.0/(filt_fl) for use by sacmft96 adn sacpom96
SEE ALSO:
	LOWPASS, HIGHPASS, BANDREJECT