window (filter design method) - FIR filter using windowed impulse response
Syntax
h = window(d,'window',fcnhndl)
h = window(d,win)
description
Note
This is a description of the overloaded method used in conjunction
with fdesign to
design a filter from a filter specification object. To access the
window function gateway see window. |
h = window(d,'window',fcnhndl) designs
an FIR filter using the specifications in filter specification object d.
Depending on the specification type of d, the returned
filter is either a single-rate digital filter — a dfilt,
or a multirate digital filter — an mfilt.
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. Refer to example 1 in the following
section to see the function argument used to design the filter.
h = window(d,win) 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.
Example
Construct a lowpass filter specification object of order 10
with a cutoff frequency of 12 kilohertz. We use a sampling frequency
of 48 kilohertz. Next we use a function handle to the function Kaiser
to provide the window.
d=fdesign.lowpass('n,fc',10,12000,48000);
Hd=window(d,'window',@kaiser);
fvtool(Hd);
See Also
design, designmethods, fdesign
 | window | | wintool |  |
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