Article

P.Amsaleka, PSNA College of Engineering and Technology; Dr.S.Mythili ,

The persons state (i.e., normal or depressed) are identified by monitoring the brain signal. Now, a days a normal person faces a lot of problems in their day to day life and this at one stage made them depressed. The human brain wave has alpha, beta, theta and delta frequencies. The changes in these frequencies is only responsible for changes in the person’s current state. When the alpha and delta wave is higher it indicates that the person is depressed. For analyzing these signals a device called Electroencephalogram (EEG} device is used. Depression is a common mental disorder characterized by sadness, loss of interest or pleasure, feelings of guilt or low self-worth, disturbed sleep or appetite feeling tiredness and poor concentration. Here the brain wave is picked from the scalp of the person who is rest state by using silver chloride (AgCl) surface electrode and the obtained signal is given to the developed EEG device containing differential amplifier (TL072 and TL074 ) and filter containing low pass and high pass filter. And the filtered output is seen using Digital Signal Oscilloscope (DSO). The normal and the depressed persons signal is seen in the DSO. Using the difference in their amplitude and frequency the state of the person is identified. Here the state of both normal and depressed person is analyzed. Further the processor is used for the analysis of depression or normal and it is displayed using LCD display.