Conversion de virgule flottante à virgule fixe

Conversion d’algorithme et de modèle

Il est possible de convertir les algorithmes de DSP System Toolbox™ de virgule flottante à virgule fixe avec les outils suivants :

Application Fixed-Point Converter (Fixed-Point Designer) pour les algorithmes MATLAB^®
Fixed-Point Tool (Fixed-Point Designer) pour les modèles Simulink^®

Ces deux fonctionnalités nécessitent le produit Fixed-Point Designer™.

Pour une liste des System objects de DSP System Toolbox qui supportent la conversion de virgule flottante à virgule fixe, veuillez consulter System Objects Supported by Fixed-Point Converter App. Pour une liste des blocs qui supportent la fonctionnalité Conversion itérative en virgule fixe dans Simulink (Fixed-Point Designer), veuillez consulter Simulink Blocks in DSP System Toolbox that Support Iterative Fixed-Point Conversion Workflow.

Rubriques

System Objects Supported by Fixed-Point Converter App
Use the Fixed-Point Converter app to automatically propose and apply data types for commonly used system objects.
Simulink Blocks in DSP System Toolbox that Support Iterative Fixed-Point Conversion Workflow
This sections lists the simulink blocks in DSP System Toolbox which support iterative fixed-point conversion workflow.
Convert dsp.FIRFilter Object to Fixed-Point Using the Fixed-Point Converter App
Convert a dsp.FIRFilter System object™, which filters a high-frequency sinusoid signal, to fixed-point using the Fixed-Point Converter app.
Specify Fixed-Point Attributes for Blocks
Teaches you how to specify fixed-point attributes and parameters in software on both the block and system levels.
Convert Floating-Point Model to Fixed Point (Fixed-Point Designer)
Use the Fixed-Point Tool to convert a floating-point model to fixed point.
Conversion itérative en virgule fixe dans Simulink (Fixed-Point Designer)
Conversion d’un modèle à virgule flottante en un modèle à virgule fixe avec un workflow guidé

Exemples présentés

Floating-Point to Fixed-Point Conversion of IIR Filters

Use the Fixed-Point Converter App to convert an IIR filter from a floating-point to a fixed-point implementation. Second-order sections (also referred as biquadratic) structures work better when using fixed-point arithmetic than structures that implement the transfer function directly. We will show that the surest path to a successful "float-to-fixed" conversion consists of the following steps:

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