Characteristics of biosignals

Introduction
A biosignal can be defined as a physiological phenomenom, a body variable that can be measured and monitored. Since the number of physiological mechanisms is nearly unlimited, the diversity of biosignals is huge. This can also be justified by the fact that there are many ways to classify the biosignals:


 * Existence
 * Dynamic
 * Origin

As referred the variety of biosignals is nearly unlimited, this makes a unique classification of biosignals impossible. Their classification is based on their characteristics.

Existence
This first method takes the existence of biosignals as a way to classify them, dividing the biosignals into:

This kind of Biosignals exist without any excitation from outside body and are always present in the Human Body because is source is already inside the body. One example is the electrocardiographic signal (ECG) induce by electrical heart muscle exi
 * Permanent Biosignals


 * Induced Biosignals