Decentralized Digitized Electrode System Design for Non-Contact Biopotential Applications
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In this thesis, a decentralized, non-contact electrode method of attaining various biopotentials from an amplified driven signal is proposed. By taking advantage of newer and smaller power efficient analog-to-digital converters (ADCs) and amplifiers, smaller capacitively sensed electrodes were able to detect and measure EEG (electroencephalography), ECG (electrocardiography) and EMG (electromyography) biopotentials. These electrodes, because they housed the ADCs directly on them, were able to digitize the analog signals directly at the source, as opposed to a more central location, which reduces the possibility of noise being injected into the signal line. Since digitization occurs on the electrodes themselves, they were then named “digital electrodes” to avoid any confusion with analog transmitted signal designs, the “analog electrodes”. In contrast with other systems, this method has also reduced the total number of components which allows the central board that houses the microprocessor and Bluetooth, the Central Dispatching Unit (CDU), to be made smaller and more portable for real, practical and portable applications.