User`s guide

Time-Varying Direct-Form II Transpose Filter
5-434
•Pole-zero
The block accepts inputs for both the numerator (Num) and denominator (Den)
vectors.
Input
Num is a vector of numerator coefficients,
[b(1) b(2) ... b(m)]
and input Den is a vector of denominator coefficients,
[a(1) a(2) ... a(n)]
•All-zero
The block accepts only the numerator vector (Num). The denominator of the
all-zero filter is 1.
•
All-pole
The block accepts only the denominator vector (Den). The numerator of the
all-pole filter is 1.
For any of these designs, the coefficient vector inputs can change over time to
alter the filter’s response characteristics during the simulation.
Initial Conditions
In its default form, the filter initializes the internal filter states to zero, which
is equivalent to assuming past inputs and outputs are zero. The block also
accepts optional nonzero initial conditions for the filter delays. Note that the
number of filter states (delay elements) per input channel is
max(m,n)-1
The Initial conditions parameter may take one of four forms:
•Empty matrix
The empty matrix,
[], causes a zero (0) initial condition to be applied to all
delay elements in each filter channel.
•Scalar
The scalar value is copied to all delay elements in each filter channel. Note
that a value of zero is equivalent to setting the
Initial conditions parameter
to the empty matrix,
[].