buttord (MathScript Function) (Windows, Not in Base Package)

LabVIEW 8.5 Help
August 2007

NI Part Number:
371361D-01

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Member of the filter design class.

Syntax

[n, wn] = buttord(wp, ws, dbp, dbs)

Returns the order and natural frequency of the lowest order Butterworth filter with a given specification.

Name	Description
wp	Specifies the passband frequency of the filter. wp is a nonnegative scalar in the interval [0, 1] or a vector of such numbers.
ws	Specifies the stopband frequency of the filter. ws is a nonnegative scalar in the interval [0, 1] or a vector of such numbers.
dbp	Specifies the decibel value of the passband. dbp is a real scalar.
dbs	Specifies the decibel value of the stopband attenuation. dbs is a real scalar.

Name	Description
n	Returns the filter order.
wn	Returns the natural frequency, or 3 dB frequency, of the filter.

% bandstop specification
WP = [0.1, 0.6];
WS = [0.3, 0.5];
DBP = 0.6;
DBS = 10;
[N, WN] = buttord(WP, WS, DBP, DBS)