multistage
Multistage filter from specification object
Support for multistage filter design using the fdesign.interpolator
and fdesign.decimator
objects will be removed in a future release. Use the designMultistageInterpolator
and the designMultistageDecimator
functions, respectively.
Multistage filter design using the fdesign.lowpass
object and the
design
function now requires you to set the
SystemObject
flag to true
unless the resulting
design is a single-stage filter and not a cascade.
For more information on how to replace your existing code, see Compatibility Considerations.
Syntax
msFilter = design(d,'multistage',SystemObject=true)
msFilter = design(...,filterstructure=structure,SystemObject=true)
msFilter = design(...,nstages=nstages,SystemObject=true)
msFilter = design(...,usehalfbands=hb,SystemObject=true)
Description
msFilter = design(d,'multistage',SystemObject=true)
designs a multistage filter whose response you specified by the filter specification object
d
.
msFilter = design(...,filterstructure=structure,SystemObject=true)
returns a filter with the structure specified by structure
. Input argument
structure
is dffir
by default and can also be one of
the following options.
structure | Valid with These Responses |
---|---|
| Lowpass or Nyquist response |
| Lowpass or Nyquist response |
| Lowpass or Nyquist response |
| Default lowpass only |
Multistage design applies to the default lowpass filter specification object and to decimators and interpolators that use either lowpass or Nyquist responses.
msFilter = design(...,nstages=nstages,SystemObject=true)
specifies nstages
, the number of stages to be used in the design.
nstages
must be an integer or auto
. To allow the
design algorithm to use the optimal number of stages while minimizing the cost of using the
resulting filter, nstages
is auto
by default. When you
specify an integer for nstages
, the design algorithm minimizes the cost for
the number of stages you specify.
msFilter = design(...,usehalfbands=hb,SystemObject=true)
uses halfband filters when you set hb
to true
. The
default value for hb
is false
.
Note
To see a list of the design methods available for your filter, use
designmethods(hd)
.