Description:

• This function returns sequence of three values:   Os , ap , as ,  where

  Os -  stopband frequency of normalized lowpass filter [1/s]

  ap -  passband ripple [dB]

  as -  stopband attenuation [dB]

Info level:

Setting of variable infolevel[syntfil]  can be used to get more detailed results.

infolevel[syntfil] =

      2  - signalize non-symmetrical BP, print new values f_s and fs, passband geometric centre, passband width, stopband width and specification of NLP (Os, ap, as)

      3  - as level 2 + print specification of entered BP (f_s, f_p, fp, fs, ap, as) and plot BP filter specification

      4  - as level 3 + plot specification of NLP

Example:

>	with(syntfil):

>	infolevel[syntfil]:=1;

>	x:=BP2NLP(1000,2000,3000,4000,3,40);

>	infolevel[syntfil]:=4;

>	BP2NLP(1000,2000,3000,4000,3,40);

Filter specification:

f_s = 1000.000000 Hz

f_p = 2000.000000 Hz

fp = 3000.000000 Hz

fs = 4000.000000 Hz

ap = 3.000000 dB

as = 40.000000 dB

Non-symetrical BP was entered.

New stopband frequency was calculated f_s = 1500.000000 Hz.

fm = 2449.489743 Hz

delta_fp = 1000.000000 Hz

delta_fs = 2500.000000 Hz

Specification of NLP:

Os = 2.500000 1/s

ap = 3.000000 dB

as = 40.000000 dB

See also: