Real time computation of difference equations

Authors:
Carlos Celaya Borges;Jorges Illescas Chávez
Affiliations:
Esteban Torres Leon, Arturo Prieto Fuenlabrada, Instituto Tecnológico de Puebla, Universidad Autónoma de Puebla;Esteban Torres Leon, Arturo Prieto Fuenlabrada, Instituto Tecnológico de Puebla, Universidad Autónoma de Puebla
Venue:
CISST'08 Proceedings of the 2nd WSEAS International Conference on Circuits, Systems, Signal and Telecommunications
Year:
2008

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Abstract

A system for real time computation of difference equations is presented. The prototype was implemented with a PIC18F458 microcontroller; two applications are presented. First, by means of basic functions: adder, delay and attenuator, a complex audio processor was achieved. The second application, a digital control of a third order plant is implemented. The analog outputs are derived from a pulse width output of PWM signals and then an external A/D converter was not required. The program was written in 'C' language. As a result, we get a compact device programmable for audio processing and control.