User`s guide

Time-Varying Lattice Filter
5-439
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.
•Vector
The vector has a length equal to the number of delay elements in each filter
channel,
length(k), and specifies a unique initial condition for each delay
element in the filter channel. This vector of initial conditions is applied to
each filter channel.
•Matrix
The matrix specifies a unique initial condition for each delay element, and
can specify different initial conditions for each filter channel. The matrix
must have the same number of rows as the number of delay elements in the
filter,
length(k), and must have one column per filter channel.
Filter Update Rate
In frame-based operation, the Filter update rate parameter determines how
frequently the block updates the filter coefficients (i.e., how often it checks the
MA or AR input). There are two available options:
•
One filter per sample time
The block updates the filter coefficients (from input MA or AR) for each
individual scalar sample in the framed input. This means that each output
sample could potentially be computed by a different filter (assuming that the
MA or AR input is updated frequently enough).
•
One filter per frame time
The block updates the filter coefficients (from input MA or AR) for each new
input frame, rather than at each sample in the frame. This means that each
output sample in a given frame is a result of an identical filtering process.