MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur télécharger pdf (Page 128)

100

101

3 Working with Signals

3-88

Use the default settings for the Normalization, Digital Clock, Mux, and To

Workspace blocks, and adjust the Signal From Workspace block parameters as

follows:

•

Signal = 1:100

•Sample time = 1/4

•Samples per frame = 4

Select Sample-based from the Output signal menu in the Frame Status

Conversion block.

Note that the current value of the Simulink timer (from the Digital Clock block)

is prepended to each output frame. The frame-based signal is converted to a

sample-based signal by the Frame Status Conversion so that the output in the

command window will be more easily readable.

In the example, the Signal From Workspace block generates a new frame

containing four samples once every second (T

=¼∗4). The first few output

frames are shown below.

(t=0)

[ 1 2 3 4]'

(t=1) [ 5 6 7 8]'

(t=2) [ 9 10 11 12]'

(t=3) [13 14 15 16]'

(t=4) [17 18 19 20]'

When you run the simulation, the normalized output, yout, is saved in a

workspace array. To convert the array to an easier-to-read matrix format, type

squeeze(yout)'

The first few samples of the result, ans, are shown below.

ans =

0 0.0333 0.0667 0.1000 0.1333

1.0000 0.0287 0.0345 0.0402 0.0460

2.0000 0.0202 0.0224 0.0247 0.0269

3.0000 0.0154 0.0165 0.0177 0.0189

4.0000 0.0124 0.0131 0.0138 0.0146

time

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 737 738

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MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur Page 128

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