QUANT_f

Block Screenshot

Contents

• Description
• Parameters
• Default properties
• Examples
• Interfacing function
• Computational function

Description

This block outputs the quantization of the input according to a choice of methods (quantization types):

• 1: Round

  Rounding the number of quantization steps (output signal is the nearest step)

• 2: Truncation

  Truncating the number of quantization steps (output signal is the nearest step towards 0)

• 3: Floor

  Rounding down the number of quantization steps (output signal is the nearest step towards -∞)

• 4: Ceil

  Rounding up the number of quantization steps (output signal is the nearest step towards +∞)

Parameters

• Step

  scalar, Quantization step

  Properties : Type 'vec' of size 1.

• Quantization Type

  scalar with possible values 1,2,3 or 4: the method of quantization used (respectively Truncation, Floor or Ceil)

  Properties : Type 'vec' of size 1.

Default properties

• always active: no

• direct-feedthrough: yes

• zero-crossing: no

• mode: no

• regular inputs:

  - port 1 : size [-1,1] / type 1

• regular outputs:

  - port 1 : size [-1,1] / type 1

• number/sizes of activation inputs: 0

• number/sizes of activation outputs: 0

• continuous-time state: no

• discrete-time state: no

• object discrete-time state: no

• name of computational function: qzrnd

Examples

Example of a sine quantized every 0.2 step with the Ceil method (using the ceil value between two steps):

Comparison of the different quantization modes:

Interfacing function

• SCI/modules/scicos_blocks/macros/NonLinear/QUANT_f.sci

Computational function

• SCI/modules/scicos_blocks/src/fortran/qzrnd.f
• SCI/modules/scicos_blocks/src/fortran/qztrn.f
• SCI/modules/scicos_blocks/src/fortran/qzflr.f
• SCI/modules/scicos_blocks/src/fortran/qzcel.f