Image Processing Reference
In-Depth Information
As it is appreciated, the amplitude values of human body bioelectrical signals are measured
in micro volts (mV). Furthermore, the amplitude values of these signals are small voltage
values and are being caught using traditional electronic devices. This is an important
characteristic which must be considered to implement an electronic device in order to obtain
bioelectrical signals.
There are different sources of noise at the moment of getting a human body signal. The
frequency domain helps us to know of how additional sources affect the important signal in
the time domain.
Figure 3 shows frequency range of QRS complex of an ECG signal next to the frequency
range of common noise sources.
Fig. 3. Frequency range of QRS complex on an ECG signal next to noise sources (Vidal et al.,
2008)
3. Digital ECG
Building a device to get and process the ECG signal must consider the signal characteristics.
According to (Cuesta, 2001; Vidal & Pavesi, 2004), facing individually each part of the global
problems is a technique applicable in order to get good practical results.
Figure 4 presents each part or block of a basic digital ECG according to reviewed literature
Fig. 4. Blocks Diagram of a Basic Digital ECG.
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