window
FIR filter using windowed impulse response
Syntax
h = window(d,fcnhndl,fcnarg,'SystemObject',true)
h = window(d,win,'SystemObject',true)
Description
h = window(d,fcnhndl,fcnarg,'SystemObject',true) designs
a single-rate digital filter System object™ using the specifications
in filter specification object d.
fcnhndl is a handle to a filter design function that returns a window
vector, such as the hamming
or blackman functions.
fcnarg is an optional argument that returns a window. You pass
the function to window.
h = window(d,win,'SystemObject',true) designs
a filter using the vector you supply in win. The
length of vector win must be the same as the impulse
response of the filter, which is equal to the filter order plus one.
Examples
Design a Nyquist Filter Using Kaiser Window
This example designs a filter using the two design techniques of specifying a function handle and passing a window vector as an input argument.
Use a window vector provided by the kaiser window function to design a Nyquist filter. The window length must be the filter order plus one.
d = fdesign.nyquist(5,'n',150); % Kaiser window with beta parameter 2.5 nyqFilter = window(d,'window',kaiser(151,2.5),'SystemObject',true); fvtool(nyqFilter)
