EEG Signal Acquisition for Sleep Analysis

Abstract: This paper describes the design of a portable, low cost EEG (Electroencephalogram) signal acquisition device which also further divides the EEG signals into its frequency components for sleep study.The primary focus of the paper is on signal acquisition and frequency division of the EEG waves into five major components. The uniqueness also lies in the minimal usage of electrodes namely 10 at the most important scalp locations. The input from the electrodes is then subjected to various amplification, filtering, noise removal techniques in both analog and digital domain, however the use of analog filtering is kept to a minimal as we try to exploit the advantages of digitization which include increased accuracy, minimal usage of hardware, and operability at lower frequencies .Further processing of the signals is done using a DSP enabled processor, allowing for digital implementation of filters.

Keywords: analog, EEG signals, DSP, amplification