User`s guide

Downsample
5-143
•Maintain input frame rate
The block generates the output at the slower (downsampled) rate by using a
proportionally smaller frame size than the input. For downsampling by a
factor of K, the output frame size is K times smaller than the input frame
size (M
o
=M
i
/K), but the input and output frame rates are equal.
The model below shows a single-channel input of frame size 64 being
downsampled by a factor of 4 to a frame size of 16. The input and output
frame rates are identical.
The setting of the
Sample-based mode popup menu does not affect
frame-based inputs.
Latency
Zero Latency. The Downsample block has zero tasking latency for the special
combinations of input signal sampling and parameter settings shown in the
table below. In all of these cases the block has single-rate operation.
Zero tasking latency means that the block propagates input sample D+1
(received at t=0) as the first output sample, followed by input sample D+1+K,
input sample D+1+2K, and so on. The
Initial condition parameter value is not
used.
Input Sampling Parameter Settings
Sample-based
Downsample factor parameter, K, is 1, or
Enforce single rate is selected (with D=0)
Frame-based
Downsample factor parameter, K, is 1, or
Maintain input frame rate is selected