Scilab 5.3.0
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- Signal Processing
- How to
- Signal
- analpf
- bilt
- buttmag
- casc
- cepstrum
- cheb1mag
- cheb2mag
- chepol
- convol
- corr
- cspect
- czt
- detrend
- dft
- ell1mag
- eqfir
- eqiir
- faurre
- ffilt
- fft
- fft2
- fftshift
- filt_sinc
- filter
- find_freq
- findm
- frfit
- frmag
- fsfirlin
- group
- hank
- hilb
- hilbert
- iir
- iirgroup
- iirlp
- intdec
- jmat
- kalm
- lattn
- lattp
- lev
- levin
- lindquist
- mese
- mfft
- mrfit
- %asn
- %k
- %sn
- phc
- pspect
- remez
- remezb
- rpem
- sincd
- srfaur
- srkf
- sskf
- syredi
- system
- trans
- wfir
- wiener
- wigner
- window
- yulewalk
- zpbutt
- zpch1
- zpch2
- zpell
Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
ell1mag
magnitude of elliptic filter
Calling Sequence
[v]=ell1mag(eps,m1,z)
Arguments
- eps
passband ripple=
1/(1+eps^2)- m1
stopband ripple=
1/(1+(eps^2)/m1)- z
sample vector of values in the complex plane
- v
elliptic filter values at sample points
Description
Function used for squared magnitude of an elliptic filter.
Usually m1=eps*eps/(a*a-1). Returns
v=real(ones(z)./(ones(z)+eps*eps*s.*s)) for s=%sn(z,m1).
Examples
deff('[alpha,BeTa]=alpha_beta(n,m,m1)',... 'if 2*int(n/2)==n then, BeTa=K1; else, BeTa=0;end;... alpha=%k(1-m1)/%k(1-m);') epsilon=0.1;A=10; //ripple parameters m1=(epsilon*epsilon)/(A*A-1);n=5;omegac=6; m=find_freq(epsilon,A,n);omegar = omegac/sqrt(m) %k(1-m1)*%k(m)/(%k(m1)*%k(1-m))-n //Check... [alpha,Beta]=alpha_beta(n,m,m1) alpha*%asn(1,m)-n*%k(m1) //Check sample=0:0.01:20; //Now we map the positive real axis into the contour... z=alpha*%asn(sample/omegac,m)+Beta*ones(sample); plot(sample,ell1mag(epsilon,m1,z))
See Also
| << dft | Signal Processing | eqfir >> |