Filter Design Basics

1 vue (au cours des 30 derniers jours)
Matlab2010 le 16 Avr 2012
I have a simple filter H(z) = 1 - z^-1
I can see my filter by writing:
b = [1 -1];
what I would like to know is how to get this into the format for the filter design toolbox.
In my case, what would i be passing to fdesign.m, or design.m.
I know they should give the same answer, but with a different plot.
Or is it not possible to get the plotyy output if you know your filter coefficents?
thank you!!

Réponse acceptée

Wayne King
Wayne King le 16 Avr 2012
Are you saying you already know the filter coefficients? In
H(z) = 1-z^{-1}
you have a high pass filter and you can create a filter object like design() would produce with:
Hd = dfilt.df1([1 -1],1);
If you do not already have the filter coefficients, then you can design the filter with fdesign and design and obtain the coefficients.
  2 commentaires
Matlab2010 le 16 Avr 2012
Yes I already have the coefficents.
The above is great. thank you.
One question -- the output does not give me a phase response? Can I get it to?
Wayne King
Wayne King le 16 Avr 2012
Yes, you can do:
[phi,w] = phasez(Hd);
% or
b = [1 -1];
[phi,w] = phasez(b,1);

Connectez-vous pour commenter.

Plus de réponses (0)


Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by