User`s guide

3 Working with Signals

3-24

As before, the frame rate of the original signal is 1 second (0.125∗8), shown by

the first Probe block. Now the Downsample block is configured to downsample

the signal by changing the frame size rather than the frame rate. The dialog

box with this setting is shown below.

The line width display on the Downsample output port verifies that the

downsampled output has a frame size of 4, half that of the input. As a result,

the sequence sample period is doubled to 0.25 seconds without any change to

the frame rate.

Frame Rebuffering

Buffering operations provide another mechanism for rate changes in DSP

models. The purpose of many buffering operations is to adjust the frame size of

the signal, M, without altering the sequence sample rate T

. This usually

results in a change to the signal’s frame rate, T

, according to the relation

Maintain input frame rate:

Downsample the signal by

changing the frame

size