Applications and delta (<3.5hz). These waves have certain

Applications of EEG signal Acquisition-A
Review

Dr.S.Maheswari M.E., Ph.D1.,
,G.Prabhakaran2, R.Vignesh3, S.Vignesh4

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2,3,4UG  Student, Electrical and Electronics
Engineering Department, Kongu Engineering College

[email protected]

[email protected]

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Abstract: The Electroencephalographic (EEG) signals are those which
records the electrical status of the human brain. The signal
pattern varies according to the chemical reaction in the human
brain.  The recorded waveforms reflect the cortical
electrical activity. EEG activity is quite small, measured in
micro volts (mV). Acquisition of the EEG signal can be
used in many research fields. Depending on the frequency of obtained
signal it can be classified into five types they are: delta, theta, alpha and
beta.

Keywords:
EEG signals, micro volts, acquisition, research fields.

I.     
Introduction

The
brain is the most complex part in the human body. It
controls the overall activity of our body, it
consist of billions of neurons which communicates with each
other in achieving it. Inside the human brain there will be a lot of chemical
reaction taking place in it. The evolution of the EEG signals took place in
1929. Hans Berger was the first scientist to tell about the EEG signals and on
the later stages it had found a drastic improvement in the research about the
various fields. The different types of brain waves have specific frequency such
as beta(14-30hz), alpha(8-13hz), theta(4-7hz) and delta
(

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