Scicos Block
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Overlap block

Contents

• Overlap block
  • Palette
  • Description
  • Dialog box
  • Default properties
  • Interfacing function
  • Computational function
  • Authors

Palette

• Signal - Signal palette

Description

This block is a nu to ny vector converter block with nu>ny.
For each activation, this block records the part [ny;ny+N] of the input vector in the discrete state, whith N an integer parameter.

$$\begin{eqnarray} \begin{array}{ccccc} z(n) &=& u(n) & {\rm for} & {\rm ny} \leq n < {\rm ny}+N. \end{array}\end{eqnarray}$$

The ouput vector y of size ny, is the input vector u[0..ny-1] added with the preceding word z[0..N-1] stored in the discrete state such as :

$$\begin{eqnarray} y(n)&=&\left\{ \begin{array}{ccc} x(n)+z_{-1}(n) & {\rm for} &... ...< N\\ x(n) & {\rm for} & N \leq n < {\rm ny} \end{array}\right. \end{eqnarray}$$

Figure 1: Equivalent diagram of the Overlap_f block

Dialog box

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

• Size of output
  Integer. The size of the regular output port.
  Type 'vec' of size 1.

• Lenght of memo word
  Integer. The length of the discrete state.
  Type 'vec' of size 1.

Default properties

• always active: no
• direct-feedthrough: yes
• zero-crossing: no
• mode: no
• regular inputs:
  - port 1 : size [8,1] / type 1
  
• regular outputs:
  - port 1 : size [16,1] / 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: overlap

Interfacing function

• MODNUMCOS/macros/scicos_blocks/Signal/OVERLAP_f.sci [view code]

Computational function

• MODNUMCOS/routines/signal/overlap.c (Type 4) [view code]

Authors

A. Layec