cheb1mag
========

response of Chebyshev type 1 filter



Calling Sequence
~~~~~~~~~~~~~~~~


::

    [h2]=cheb1mag(n,omegac,epsilon,sample)




Arguments
~~~~~~~~~

:n integer : filter order
: :omegac real : cut-off frequency
: :epsilon real : ripple in pass band
: :sample vector of frequencies where `cheb1mag` is evaluated
: :h2 Chebyshev I filter values at sample points
:



Description
~~~~~~~~~~~

Square magnitude response of a type 1 Chebyshev filter.

`omegac`=passband edge.

`epsilon`such that `1/(1+epsilon^2)`=passband ripple.

`sample`vector of frequencies where the square magnitude is desired.



Examples
~~~~~~~~


::

    //Chebyshev; ripple in the passband
    n=13;epsilon=0.2;omegac=3;`sample`_=0:0.05:10;
    h=cheb1mag(n,omegac,epsilon,`sample`_);
    `plot2d`_(`sample`_,h)
    `xtitle`_('','frequencies','magnitude')




See Also
~~~~~~~~


+ `buttmag`_ Power transmission of a Butterworth filter


.. _buttmag: buttmag.html