Chirp Signal (Simulink Reference)

Generate a sine wave with increasing frequency

Library

Sources

Description

The Chirp Signal block generates a sine wave whose frequency increases at a linear rate with time. You can use this block for spectral analysis of nonlinear systems. The block generates a scalar or vector output.

The parameters, Initial frequency, Target time, and Frequency at target time, determine the block's output. You can specify any or all of these variables as scalars or arrays. All the parameters specified as arrays must have the same dimensions. The block expands scalar parameters to have the same dimensions as the array parameters. The block output has the same dimensions as the parameters unless you select the Interpret vector parameters as 1-D option. If you select this option and the parameters are row or column vectors, the block outputs a vector (1-D array) signal.

Data Type Support

The Chirp Signal block outputs a real-valued signal of type double.

Parameters and Dialog Box

Opening this dialog box causes a running simulation to pause. See Changing Source Block Parameters in the online Simulink documentation for details.

Initial frequency: The initial frequency of the signal, specified as a scalar or matrix value. The default is 0.1 Hz.
Target time: The time at which the frequency reaches the Frequency at target time parameter value, a scalar or matrix value. The frequency continues to change at the same rate after this time. The default is 100 seconds.
Frequency at target time: The frequency of the signal at the target time, a scalar or matrix value. The default is 1 Hz.
Interpret vector parameters as 1-D: If selected, column or row matrix values for the Initial frequency, Target time, and Frequency at target time parameters result in a vector output whose elements are the elements of the row or column.

Characteristics

Sample Time
Continuous

Scalar Expansion
Yes, of parameters

Dimensionalized
Yes

Zero Crossing
No

Sample Time	Continuous
Scalar Expansion	Yes, of parameters
Dimensionalized	Yes
Zero Crossing	No

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