MATLAB SIGNAL PROCESSING BLOCKSET 7 Betriebsanweisung PDF herunterladen (Seite 305)

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101

DSP Constant

5-148

5DSP Constant

Purpose Generate a discrete-time or continuous-time constant signal.

Library DSP Sources

Description The DSP Constant block generates a signal whose value remains constant

throughout the simulation. The

Constant value parameter specifies the

constant to output, and can be any valid MATLAB expression that evaluates to

a scalar, vector, or matrix.

When a row vector or column vector is specified for the

Constant value

parameter, and the

Interpret vector parameters as 1-D check box is selected,

the dimension of the

Constant value vector is disregarded, and the output is a

1-D vector. When the

Interpret vector parameters as 1-D check box is not

selected, the output dimension is constrained to match the

Constant value

dimension (row or column). When the Constant value is an M-by-N matrix

with M > 1 and N > 1, the output is always M-by-N.

When

Sample mode is set to Continuous, the output is a continuous-time

signal. When

Sample mode is set to Discrete, the Sample time and

Frame-based output parameters are enabled, and signal has the discrete

output period specified by the

Sample time parameter.

When the

Frame-based output check box is selected, the output is

frame-based; otherwise, the output is sample-based. Because a 1-D vector

signal cannot be frame-based, an active

Frame-based output setting overrides

an active

Interpret vector parameters as 1-D setting, and the output is a

frame-based column vector (regardless of the actual

Constant value vector

dimension).

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