Chirp signal

Generate normally distributed Chirpsignal numbers.

Collaboration diagram for Chirp signal:

A chirp signal is a periodic signal (i.e sinusoid) with a frequency that changes continuously with time. This specific function generates a chirpsignal with a linearly increasing frequency.

A chirp function with a linearly increasing frequency.

Author

Benjamin Scholz

Karl Gunnar Aarsæther

Date

11.09.2007 BSC: Initial version.

19.07.2011 KGA: Updated to FhSim 2.0 and documented

Example configuration excerpt

<Lib
  LibName          = "fhsim_base"
  SimObject        = "Src/Chirpsignal"
  Name             = "chirp"
  PortWidth        = "1"
  StartFrequencyHz = "1"
  StopFrequencyHz  = "10"
  TargetTime       = "12"
/>

Input Ports

This function has no inputs.

Output Ports

Name	Width	Description
Out	<PortWidth>	The output signal
OutDot	<PortWidth>	The derivative of the output signal

Configuration parameters

Name	Width	Description
PortWidth	1	The number of elements in the signal.
StartFrequencyHz	<PortWidth>	The initial frequency of the signal (Hz)
StartFrequencyRads	<PortWidth>	The initial frequency of the signal (rad)
StopFrequencyHz	<PortWidth>	The final frequency reached at the specified target time. [Hz]
StopFrequencyRads	<PortWidth>	The initial frequency of the signal (rad)
TargetTime	<PortWidth>	The time when the signal reaches the final frequency [sec]

Initial conditions

There are no initial conditions for this function.

Full example file

<Contents>
  <OBJECTS>
    <Lib
        LibName="base"
        SimObject="Src/Chirpsignal"
        Name="A"
        StartFrequencyHz="0"
        StopFrequencyHz="30"
        TargetTime="30"
    />
   
  </OBJECTS>
  
  <INTERCONNECTIONS>
    <Connection
    />
  </INTERCONNECTIONS>
 
  <INITIALIZATION>
    <InitialCondition
    />
  </INITIALIZATION>
 
  <SIMULATION>
    <Timing TStart="0" TEnd="11.0"/>
    <Integrator Method="RK45_i" NumCores="1" LogStates="1" UseRSSNorm="0">
      <StepControl StepMax="0.002" StepMin="0.00000001" AbsTol="1e-3" RelTol="1e-3"/>
    </Integrator>
    
  </SIMULATION>
 
<OBSERVERS>
    <FileOutput TOutput="0, 0:1:10, 100" Select="objects:all"/>
  </OBSERVERS>
</Contents>

This SimObject is referred to as Src/Chirpsignal