butterworth_asnew.html

syntfil[Butterworth_asnew] - compute the new value of the stopband attenuation

Calling sequence:

Butterworth_asnew(order, Os, ap)

Parameters:

order - order of the Butterworth approximation [-]

Os - stopband frequency of the normalized lowpass (NLP) [1/s]

ap - passband ripple [dB]

Parameter order must be positive integer. Parameters Os a ap must be positive number, where Os > 1 .

Description:

This function returns the new value of the stopband attenuation ( as [dB] ) of the NLP for the Butterworth approximation.

Example:

> with(syntfil):

Specification of the NLP

> Os,ap,as:=2,3,25;

Compute the order of the Butterworth approximation

> bx:=ButterworthNLPOrder(Os,ap,as);

> Butterworth_asnew(bx);

See also:

ButterworthNLPOrder