Digital Signal Processing Using Symbian C++ in Embedded Systems

Embedded Systems are present everywhere around the world, from small tiny applications to high-end complex systems. An embedded system is a special-purpose system in which the computer is completely encapsulated by the device it controls. Unlike a general-purpose computer, such as a personal computer, an embedded system performs one or a few pre-defined tasks, usually with very specific requirements. Since the system is dedicated to specific tasks, design engineers can optimize it, reducing the size and cost of the product. (www.en.wikipedia.org, 2006/11/17). An embedded system must interact with the environment in which it is working. Consequently, it must be able to perceive the external signals which make it take decisions. For that, it must process the information received by its sensors connected to it. And it is the point where digital signal processing comes into high level of importance because through this process the system is able to interact and develop the functions which it has been designed for. The present document shows the results obtained in the development of an application that collect information from a mobile device and process it using DSP techniques. The system implemented runs on a mobile device that uses Symbian as operating system. Hence, the application was developed win Symbian C++ using Microsoft Visual Studio.Net 2003, a Nokia SDK for the Nokia 7710 and a Nokia 7710 mobile device in which the application was tested with satisfactory results. Consequently, this document will present some basic concepts regarding to DSP technology, Symbian OS and the development results.