User`s guide

Repeat
5-369
5Repeat
Purpose Resample an input at a higher rate by repeating values.
Library Signal Operations
Description The Repeat block upsamples each channel of the M
i
-by-N input to a rate
L times higher than the input sample rate by repeating each consecutive input
sample L times at the output. The integer L is specified by the
Repetition
count
parameter.
Sample-Based Operation
When the input is sample-based, the block treats each of the M∗N matrix
elements as an independent channel, and upsamples each channel over time.
The
Frame-based mode parameter must be set to Maintain input frame size.
The output sample rate is L times higher than the input sample rate
(T
so
=T
si
/L), and the input and output sizes are identical.
Frame-Based Operation
When the input is frame-based, the block treats each of the N input columns as
a frame containing M
i
sequential time samples from an independent channel.
The block upsamples each channel independently by repeating each row of the
input matrix L times at the output. The
Frame-based mode parameter
determines how the block adjusts the rate at the output to accommodate the
repeated rows. There are two available options:
•
Maintain input frame size
The block generates the output at the faster (upsampled) rate by using a
proportionally shorter frame period at the output port than at the input port.
For L repetitions of the input, the output frame period is L times shorter
than the input frame period (T
fo
=T
fi
/L), but the input and output frame
sizes are equal.
The model below shows a single-channel input with a frame period of
1 second being upsampled through 4-times repetition to a frame period of
0.25 seconds. The input and output frame sizes are identical.