% -*- texinfo -*- % @deftypefn {Function File} {[@var{h}, @var{w}] =} freqz (@var{b}, @var{a}, @var{n}, 'whole') % Return the complex frequency response @var{h} of the rational IIR filter % whose numerator and denominator coefficients are @var{b} and @var{a}, % respectively. The response is evaluated at @var{n} angular frequencies % between 0 and % @ifnottex % 2*pi. % @end ifnottex % @iftex % @tex % $2\pi$. % @end tex % @end iftex % % @noindent % The output value @var{w} is a vector of the frequencies. % % If the fourth argument is omitted, the response is evaluated at % frequencies between 0 and % @ifnottex % pi. % @end ifnottex % @iftex % @tex % $\pi$. % @end tex % @end iftex % % If @var{n} is omitted, a value of 512 is assumed. % % If @var{a} is omitted, the denominator is assumed to be 1 (this % corresponds to a simple FIR filter). % % For fastest computation, @var{n} should factor into a small number of % small primes. % % @deftypefnx {Function File} {@var{h} =} freqz (@var{b}, @var{a}, @var{w}) % Evaluate the response at the specific frequencies in the vector @var{w}. % The values for @var{w} are measured in radians. % % @deftypefnx {Function File} {[@dots{}] =} freqz (@dots{}, @var{Fs}) % Return frequencies in Hz instead of radians assuming a sampling rate % @var{Fs}. If you are evaluating the response at specific frequencies % @var{w}, those frequencies should be requested in Hz rather than radians. % % @deftypefnx {Function File} {} freqz (@dots{}) % Plot the pass band, stop band and phase response of @var{h} rather % than returning them. % @end deftypefn

- freqz_plot % Plot the pass band, stop band and phase response of @var{h}.

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