A Platform for Real Time Brain-Waves Analysis System

Abstract

Abstract. There are many methods for human-computer interface. Recently, many researchers are studying about brain-signal. This is because not only the disabled can use a computer by their thought without their limbs but also it is convenient to general people. In this paper, we propose a platform for the real time electroencephalogram(EEG) and magnetoencephalography(MEG) analysis system. The signals on the scalp are so weak. Thus, the signals must be amplified by the amplifier. Filters are used to filter the incoming continuous signal before it is sampled by the analog-to-digital converter(ADC). The filtered EEG and MEG are analyzed and compacted by using FFT and JPEG2000, respectively. The platform is easy to reuse because of its simple block architecture and is implemented as a single chip on the Xilinx Virtex5 FPGA development board.

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“…The features of each frequency are shown in Table 1. In Table 1, there are delta waves (frequency 0.5-4 Hz), theta waves (frequency 4-7 Hz), alpha waves (frequency 8-13 Hz), beta waves (frequency 14-30 Hz), and gamma waves (frequency 30 Hz and over) [11]. Alpha waves are associated with meditation and relaxation; all types can also be attributed to attention or concentration at slower frequencies [12].…”

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“…There are Delta waves (frequency 0.5-4Hz), Theta waves (frequency 4-7Hz), Alpha waves (frequency 8-13Hz), Beta waves (frequency 14-30 Hz) and gamma waves (frequency 30Hz and over). [1] Alpha waves are associated with meditation and relaxation, all types can also be attributed to attention or concentration at slower frequencies. [2] Beta waves are related to concentration.…”

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“…Figure 3 shows the circadian patterns typical of someone who rises early in morning, eats lunch around noon, and sleeps at night (10 p.m.). Although circadian rhythms tend to be synchronized with cycles of light and dark, other factors -such as ambient temperature, meal times, stress and exercise -can influence the timing as well 5 . In humans the average internal temperature is 37.0 °C (98.6 °F), though it varies among individuals.…”

“…As Table 1 there are Delta waves (frequency 0.5-4Hz), Theta waves (frequency 4-7Hz), Alpha waves (frequency 8-13Hz), Beta waves (frequency 14-30 Hz)and gamma waves(frequency 30Hz and over). [5] Alpha waves are associated with meditation and relaxation, all types can also be attributed to attention or concentration at slower frequencies. [6] Beta waves are related to concentration.…”