MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur télécharger pdf (Page 89)

100

101

Constructing Signals

3-49

•“Example: Buffering Frame-Based Signals with Overlap” on page 3-52

•“Buffering Delay and Initial Conditions” on page 3-53

Example: Buffering Sample-Based Signals without Overlap. In the model below, a

two-channel sample-based signal is buffered into a two-channel frame-based

signal.

To build the model, make the following parameter settings:

•In Signal From Workspace:

Signal = [1:10;-1:-1:-10]'

- Sample time = 1

- Samples per frame = 1

•In Buffer

Output buffer size = 4

Buffer overlap = 0

- Initial conditions = 0

The Signal From Workspace block generates one two-channel sample at each

sample time due to the

Samples per frame parameter setting of 1. The Buffer

size

setting of 4 in the Buffer block results in a frame-based output with frame

size 4.

A much better way to create the frame-based signal shown above is to set the

Samples per frame parameter of the Signal From Workspace block to 4. The

Signal From Workspace block then performs the buffering internally, and

directly generates the two-channel frame-based signal; the separate Buffer

block is not needed. See the following sections for more information:

•“Creating Signals Using the Signal From Workspace Block” on page 3-38

Four consecutive samples from a

2-channel sample-based signal

2-channel frame-based signal

11–

22–

33–

44–

[1 -1]

[2 -2]

[3 -3]

[4 -4]

t=0t=1t=2t=3

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 737 738

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MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur Page 89

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