My Summary About Origin of Biosignals

Fajar Purnama
10 min readJan 14, 2021


This is a summary about Biosignals in my Masters course of Bioinformation Engineering. If the passage is too much for you, then it is better to view the slide instead. This assignment except for the images which are from Miller Karol “Biological and medical physics, biomedical engineering” (2011), has never been published anywhere and I, as the author and copyright holder, license this assignment customized CC-BY-SA where anyone can share, copy, republish, and sell on condition to state my name as the author and notify that the original and open version available here.

1. Fudamental of Biosignals

From the biosignal is defined as a description of a physiological phenomena, the word “bio” and “signal” itself can mean any signals that can be found in living beings, also signal is some kind of message which contain informations. The very basic of biosignal assessment is from physiologist or us through observing the condition of the patient as on Fig. 1.1. The signals can be perceived by our senses like seeing in Fig. 1.1, touching as in Fig. 1.2, and hearing as in Fig. 1.3.

Fig. 1.1 Illustration of basic assessment of biosignals

Fig. 1.2 Biosignals perceived through touching

Fig. 1.3 Biosignals perceived through hearing

Moving on to the next topic, where does biosignals come from? Apart from looking through our eyes we can feel vibrations and hear sounds emanating from within the living body. It is said the sources are vital organs which will be discussed on chapter 2. Those sounds and vibrations will travel through the body and perceived by us. It can be illustrated in Fig. 1.4 where they transmit, propagate, and us, receive. Thus this can be mathematically modeled as a block diagram which in the book had a figure as in Fig. 1.5 where there is biosignals source, then goes through propagation, coupling, and conversion loss, finally registration of…

Fajar Purnama

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