ELECTROOCULOGRAM SIGNAL PROCESSING CIRCUIT AND ELECTROOCULOGRAM-BASED HUMAN-COMPUTER INTERACTION SYSTEM

摘要

An electrooculogram signal processing circuit and an electrooculogram-based human-computer interaction system. The processing circuit comprises a differential electrode as well as a high-pass filter, a preamplifier (130), a trap filter, a single-end amplified low-pass filter, an ADC, and a master control unit that are in cascade connection with the differential electrode in sequence; the preamplifier (130) comprises an instrument amplifying unit, a threshold detecting and waveform shaping unit, and a gain control unit; the instrument amplifying unit is connected to the high-pass filter and the trap filter; the threshold detecting and waveform shaping unit is connected to the instrument amplifying unit; the master control unit is connected to the threshold detecting and waveform shaping unit, receives changed waveform, and outputs a corresponding first instruction to the gain control unit; the gain control unit receives the first instruction so as to set the gain of the instrument amplifying unit; and the master control unit receives an output signal from the ADC and outputs a corresponding second instruction. The electrooculogram signal collection flexibility can be fully improved, so that performance of collection of electrooculogram signals of a user in various scenarios is optimized.