Adams Basic Package > Adams View > View Function Builder > Design-Time Functions > Functions: A - C > BUTTORD_ORDER

BUTTORD_ORDER

Calculates the order for the Butterworth filter.

Format

BUTTORD_ORDER (wp, ws, rp, rs, isDigital)

Arguments

 
wp
ARRAY: Passband corner frequency. wp, the cutoff frequency, has a value between 0 and 1, where 1 corresponds to half the sampling frequency (the Nyquist frequency).
ws
ARRAY: Stopband corner frequency. ws is in the same units as wp; it has a value between 0 and 1, where 1 corresponds to half the sampling frequency (the Nyquist frequency.)
rp
REAL: Passband ripple, in decibels. This value is the maximum permissible passband loss in decibels. The passband is 0<w<1p.
rs
REAL: Stopband attenuation, in decibels. This value is the number of decibels the stopband is down from the passband. The stopband is Ws<w<1.
isDigital
A Boolean value.

Example

The following is an illustration of the BUTTORD_ORDER function:
 
Function
buttord_order ({0.2, 0.4}, {0.1, 0.5}, 3.0, 30.0, 1)
Result
6
 
Note:  
wp and ws must have the same array size, either one or two.
Learn more about matrix/array functions.