Scicos Block
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Multiple Frequencies

Contents

• Multiple Frequencies
  • Palette
  • Description
  • Dialog box
  • Example
  • Default properties
  • Interfacing function
  • Computational function
  • See also
  • Authors

Palette

• Events - Events palette

Description

This blocks generates events at specific sample time of the simulation time. The sample time is given in the "Sample Time" field and the offset is given in the "Offset" field. This block has one event input, the number of event outputs depends on the number of different sample times. For example if the vector of sample times is [1 1 2] and the vector of offset is [0 .5 0] then the block has 7 outputs.
- The first output is activated when the simulation time is equal to a multiple of the first sample time plus the first offset
- The second output is activated when the simulation time is equal to a multiple of the second sample time plus the second offset.
- The third output is activated when we have both cases, first case and second case.
- The fourth output is activated when the simulation time is equal to a multiple of the third sample time plus the third offset.
- The fifth output is activated when we have both cases, first case and forth case.
- The sixth output is activated when we have both cases, second case and fourth case.
- The seventh output is activated when we have both cases, third case and forth case.
etc...
So the number of outputs is equal to 2**number of different time values. Each of these time values is represented by a binary number associated to the output's number in decimal.

Dialog box

• Sample time
  Vector of sample time values.
  Properties : Type 'vec' of size -1.

• Offset
  Vector of offset values. Must have the same size as the Sample time and each offset value must be less than its corresponding sample time.
  Properties : Type 'vec' of size -1.

Example

Let us take the example where the sample time is equal to [1 1 2] and the offset is equal to [0 .5 0]. Consider t=simulation time.
When t=0, the fifth output is activated (001 + 100).
When t=0.5, the second output is activated (010).
When t=1, the first output is activated (001).
When t=1.5, the second output is activated (010).
When t=2 we loop back to 0.

Default properties

• always active: no
• direct-feedthrough: no
• zero-crossing: no
• mode: no
• number/sizes of activation inputs: 1
• number/sizes of activation outputs: 3
• continuous-time state: no
• discrete-time state: no
• object discrete-time state: no
• name of computational function: m_frequ

Interfacing function

• SCI/macros/scicos_blocks/Events/M_freq.sci [view code]

Computational function

• SCI/routines/scicos/m_frequ.c (Type 4) [view code]

See also

• MFCLCK_f - MFCLCK_f title (Scicos Block)

Authors

Fady NASSIF INRIA