User`s guide

Sample Rates and Frame Rates

3-23

The sample period and frame size of the original signal are set to 0.125 seconds

and 8 samples per frame, respectively, by the

Sample time and Samples per

frame

parameters in the Signal From Workspace block. This results in a frame

rate of 1 second (0.125

∗8), as shown by the first Probe block.

The Downsample block is configured to downsample the signal by changing the

frame rate rather than the frame size. The dialog box with this setting is shown

below.

The second Probe block in the model verifies that the output from the

Downsample block has a frame period of 2, twice that of the input (i.e., half the

rate). As a result, the sequence sample period is doubled to 0.25 seconds

without any change to the frame size.

Example: Rate Conversion by Frame-Size Adjustment. The model from “Example: Rate

Conversion by Frame-Rate Adjustment” on page 3-22 is shown again below,

but this time with the rate conversion implemented by adjusting the frame

size, rather than the frame rate.

Maintain input frame size:

Downsample the signal by

changing the frame

rate