Frequency content analysis of brainwave C3 and P3 for dyslexia related writing disorder

摘要

Signal processing is an operation design for extracting, enhancing, storing and transmitting useful content of information. In extracting information from the electroencephalogram, digital signal processing techniques are used. In this paper, the EEG signals generated by 2 channels C3 and P3, before and during writing were recorded, which are then filtered using a band pass filter with frequency range 8–30 Hz. The signal was then analysed with Fast Fourier Transform. Analysis of the frequency content of the EEG signals revealed that amplitude between 20–32 uV is reported during relaxation while 12–17uV is reported during writing; frequency between 10–25 Hz is reported during writing while 9–14 Hz is reported during relaxation. Due to the overlap in the frequency which will cause problem to classification, inter-study discrepancy and inconsistency, it is opinioned that the frequency spectrum envelope should also be recruited as the additional feature for classification.