Electrooculogram signal processing circuit and ocular electricity-based human-machine interaction system

Abstract

The invention relates to an electrooculogram signal processing circuit and an ocular electricity-based human-machine interaction system. The electrooculogram signal processing circuit of the inventioncomprises a differential electrode and a high-pass filter, a preamplifier, a notch filter, a single-ended amplification low-pass filter, ADC and a main control unit which are sequentially connected in cascade with the differential electrode. The preamplifier includes a meter amplification unit, a threshold detection waveform shaping unit and a gain control unit. The meter amplification unit is connected with the high-pass filter and the notch filter. The threshold detection waveform shaping unit is connected with the meter amplification unit. The main control unit is connected with the threshold detection waveform shaping unit, receives a changed waveform, and outputs a corresponding first instruction to the gain control unit. The gain control unit receives the first instruction to set again of the meter amplification unit. The main control unit receives an output signal of the ADC, and outputs a corresponding second instruction. By implementing the circuit, sensitivity of collectingelectrooculogram signals can be sufficiently improved, and collection performance on the electrooculogram signals of users can be optimized under various scenes.

Description

technical field [0001] The present invention relates to the technical field of human-computer interaction based on biology, and more specifically, relates to an electro-oculogram signal processing circuit and an electro-oculogram-based human-computer interaction system. Background technique [0002] The electro-oculogram signal acquisition circuit in the current prior art cuts off the signal collected by the electrodes, amplifies it with a fixed gain of the instrumentation amplifier, and then passes through low-pass filtering, second-stage amplification, further low-pass filtering, AD conversion, and the main processor, etc. deal with. For example, the oculoelectric signal acquisition circuit used in the patent No. CN 106775023 A and the patent No. CN 101598973A. The sensitivity of signal acquisition in these existing electrooculogram signal acquisition circuits is generally low. When the users are different, the same processing gain is adopted, because different users carr...

AI Technical Summary

Problems solved by technology

Or when the same user is in different usage scenarios, for example, in some environments where there are many electronic devices or are subject to strong 50Hz interference, the sensitivity of the electro-oculogram signal may also decrease or even cause the electro-oculogram signal to be collected due to excessive interference. The circuit is saturated and cannot detect accurate electro-oculogram signals

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