Generate sine wave with increasing frequency

Generate sine wave with increasing frequency

Libraries: Simulink / Sources

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.

Track the running minimum value of a signal generated by the Chirp Signal block.

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.

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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

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

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.

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

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 Determine the Output Dimensions of Source Blocks.

Data Types

double

Direct Feedthrough

no

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Not recommended for production code. Relates to resource limits and restrictions on speed and memory often found in embedded systems. Generated code can contain dynamic allocation and freeing of memory, recursion, additional memory overhead, and widely-varying execution times. While the code is functionally valid and generally acceptable in resource-rich environments, smaller embedded targets often cannot support such code. Usually, blocks evolve toward being suitable for production code. Thus, blocks suitable for production code remain suitable.

Introduced before R2006a

Sine Wave