SUMMARY

Applies an IIR bandreject filter.

SYNTAX

BANDREJ {BUTTER|BESSEL|C1|C2}
     {CORNERS v1 v2},
     {NPOLES n}
     {PASSES n}
     {TRANBW v},{ATTEN v}

INPUT

BUTTER:	Apply a Butterworth filter.
BESSEL:	Apply a Bessel Filter.
C1:	Apply a Chebyshev Type I filter.
C2:	Apply a Chebyshev Type II filter.
CORNERS v1 v2:	Set corner frequencies to v1 and v2.
NPOLES n:	Set number of poles {range: 1-10}.
PASSES n:	Set number of passes {n=1: causal, n=2: zero-phase}.
TRANBW v:	Set the Chebyshev transition bandwidth to V.
ATTEN v:	Set the Chebyshev attenuation factor to V.

DEFAULT VALUES

BANDREJ BUTTER CORNER 0.1 0.4 NPOLES 2 PASSES 1 TRANBW 0.3 ATTEN 30.

DESCRIPTION

See the BANDPASS command for definitions of the filter parameters and descriptions on how to use them.

EXAMPLES

To apply a four-pole Butterworth with corners at 2 and 5 Hz.:

SAC> BANDREJ NPOLES 4 CORNER 2 5

To apply a two-pole two-pass Bessel with the same corners.:

SAC> BR N 2 BE P 2

ERROR MESSAGES

• 1301: No data files read in.

• 1306: Illegal operation on unevenly spaced file

• 1307: Illegal operation on spectral file

• 1002: Bad value for

  • corner frequency larger than Nyquist frequency.

HEADER CHANGES

DEPMIN, DEPMAX, DEPMEN

SEE COMMANDS

BANDPASS

LATEST REVISION

January 8, 1983 (Version 8.0)