Scicos Block
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Discrete Symbol Integrator block

Contents

• Discrete Symbol Integrator block
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Computational function
  • Authors

Palette

• Filter - Digital filters palette

Description

This block is a discrete symbol integrator. The integration is done over one symbol period and the state is re-initialized at zero for the first sample. During the integration the applied method is just a cumulative sum of all sample values over one period :

$$\begin{eqnarray} y_{n}=\sum^{n}_{k=1}u_{k}\mid_{n=1:N_{\tt e}} \end{eqnarray}$$

with y the output of the block, u the input and Ne the length of the symbol. The input and output port can be both scalar or vector.

Figure 1: Input and output waveforms of the discrete integrator

Dialog box

• Size of inputs
  The size of the regular input port.
  Type 'vec' of size 1.

• Number of sample
  The length of the symbol in sample.
  Type 'vec' of size 1.

• Init counter value
  The initial sample where the discrete integration begins.
  Type 'vec' of size 1.

• Gain
  The gain applied to the regular output port.
  Type 'vec' of size 1.

• Inherit (no:0, yes:1)
  Herits events by its regular input ports (disable the event input port).
  Type 'vec' of size 1.

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: no
• mode: no
• regular inputs:
  - port 1 : size [64,1] / type 1
  
• regular outputs:
  - port 1 : size [64,1] / type 1
  
• number/sizes of activation inputs: 0
• number/sizes of activation outputs: 0
• continuous-time state: no
• discrete-time state: yes
• object discrete-time state: no
• name of computational function: int_symb

Interfacing function

• MODNUMCOS/macros/scicos_blocks/Filter/INTSYMB_f.sci [view code]

Computational function

• MODNUMCOS/routines/filter/int_symb.c (Type 4) [view code]

Authors

A. Layec