User`s guide

Upsample
5-486
Latency and Initial Conditions
Zero Latency. The Upsample block has zero tasking latency for all single-rate
operations. The block is single-rate for the particular combinations of sampling
mode and parameter settings shown in the table below.
The block also has zero latency for all multirate operations in Simulink’s
single-tasking mode.
Zero tasking latency means that the block propagates the first input (received
at t=0) immediately following the D consecutive zeros specified by the
Sample
offset
parameter. This output (D+1) is followed in turn by the L-1 inserted
zeros and the next input sample. The
Initial condition parameter value is not
used.
Nonzero Latency. The Upsample block has tasking latency only for multirate
operation in Simulink’s multitasking mode:
•In sample-based mode, the initial condition for each channel appears as
output sample D+1, and is followed by L-1 inserted zeros. The channel’s first
input appears as output sample D+L+1. The
Initial condition value can be
an M
i
-by-N matrix containing one value for each channel, or a scalar to be
applied to all signal channels.
•In frame-based mode, the first row of the initial condition matrix appears as
output sample D+1, and is followed by L-1 inserted rows of zeros, the second
row of the initial condition matrix, and so on. The first row of the first input
matrix appears in the output as sample M
i
L+D+1. The Initial condition
value can be an M
i
-by-N matrix, or a scalar to be repeated across all elements
of the M
i
-by-N matrix. See the example below for an illustration of this case.
Sampling Mode Parameter Settings
Sample-based Upsample factor parameter, L, is 1.
Frame-based
Upsample factor parameter, L, is 1, or
Frame-based mode parameter is Maintain input
frame rate
.