cheb1ap - Chebyshev Type I analog lowpass filter prototype
Syntax
[z,p,k] = cheb1ap(n,Rp)
Description
[z,p,k] = cheb1ap(n,Rp) returns
the poles and gain of an order n Chebyshev Type
I analog lowpass filter prototype with Rp dB
of ripple in the passband. The function returns the poles in the length n column
vector p and the gain in scalar k. z is an empty
matrix, because there are no zeros. The transfer function is
Chebyshev Type I filters are equiripple in the passband and
monotonic in the stopband. The poles are evenly spaced about an ellipse
in the left half plane. The Chebyshev Type I passband edge angular
frequency
is set to 1.0 for a normalized result. This is
the frequency at which the passband ends and the filter has magnitude
response of 10-Rp/20.
References
[1] Parks, T.W., and C.S. Burrus. Digital
Filter Design,New York: John Wiley & Sons, 1987. Chapter7.
See Also
besselap, buttap, cheby1, cheb2ap, ellipap
 | cfirpm | | cheb1ord |  |
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