This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.

Chirp Signal

Generate sine wave with increasing frequency

  • Library:
  • Simulink / 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 check box. If you select this check box and the parameters are row or column vectors, the block outputs a vector (1-D array) signal.

Limitations

  • The start time of the simulation must be 0. To confirm this value, go to the Solver pane in the Configuration Parameters dialog box and view the Start time field.

  • Suppose that you use a Chirp Signal block in an enabled subsystem. Whenever the subsystem is enabled, the block output matches what would appear if the subsystem were enabled throughout the simulation.

Ports

Output

expand all

Sine wave whose frequency increases at a linear rate with time. The chirp signal can be a scalar, vector, matrix, or N-D array.

Data Types: double

Parameters

expand all

The initial frequency of the signal, specified as a scalar, vector, matrix, or N-D array.

Programmatic Use

Block Parameter: f1
Type: character vector
Values: scalar | vector | matrix | N-D array
Default: '0.1'

Time, in seconds, at which the frequency reaches the Frequency at target time parameter value. You specify the Target time as a scalar, vector, matrix, or N-D array. After the target time is reached, the frequency continues to change at the same rate.

Programmatic Use

Block Parameter: T
Type: character vector
Values: scalar | vector | matrix | N-D array
Default: '100'

Frequency, in Hz, of the signal at the target time, specified as a scalar, vector, matrix, or N-D array.

Programmatic Use

Block Parameter: f2
Type: character vector
Values: scalar | vector | matrix | N-D array
Default: '1'

When you select this check box, any column or row matrix values you specify 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. For more information, see Determining the Output Dimensions of Source Blocks.

Programmatic Use

Block Parameter: VectorParams1D
Type: character vector
Values: 'on' | 'off'
Default: 'on'

Block Characteristics

Data Types

double

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Extended Capabilities

Introduced before R2006a