User`s guide

New Features
15-3
•initse — Prepare the input arguments for the sign-error variant of the
LMS-based adaptive filter function
•
initss — Prepare the input arguments for the sign-sign variant of the
LMS-based adaptive filter function
New FIR Filter Design Functions
In addition to the new adaptive filtering capabilities, this version of the toolbox
has four new filter design functions.
•
firhalfband — Design Lth-band filters where L=2. About half of the filter
coefficients are zero so the filters are very efficient to calculate
•
firminphase — Calculate the minimum-phase FIR spectral factor of a
linear-phase FIR filter
•
firnyquist — Design lowpass filters with certain specified coefficients in
the transfer functions set to zero by design
•
ifir — Design an interpolated FIR filter
FDATool includes
Halfband and Nyquist entries under Filter Type so you can
design and analyze these kinds of filters within FDATool.
New Filter Transformation Functions
The Filter Design Toolbox 2.1 includes several new filter transformation
functions. Each transformation maintains the ripple characteristics and
passband/stopband shapes of the source filter while transforming to the new
specification.
•
firlp2lp — Transforms lowpass FIR filters to lowpass FIR filters with
different passband width or cutoff specifications
•
firlp2hp — Transforms lowpass FIR filters to highpass FIR filters
•
iirlp2bp — Transforms lowpass IIR filters to bandpass IIR filters
•
iirlp2bs — Transforms lowpass IIR filters to bandstop IIR filters
•
iirlp2hp — Transforms lowpass IIR filters to highpass IIR filters
•
iirlp2lp — Transforms lowpass IIR filters to lowpass IIR filters
The new
Transformations option (refer to the next entry in this section) in
FDATool provides access to these transformations from the GUI.