Data acquisition circuit for electroencephalogram detection

Abstract

The invention discloses a data acquisition circuit for electroencephalogram detection, which comprises a main clock, a sequential logic circuit, an acquisition bus, a latched / series shift register and a plurality of buffer gates. Each branch circuit respectively transmits sampled synchronous data to one buffer gate; on the basis of the main clock, according to the requirements of a frame structure, the sequential logic circuit sends gate control signals from different paths of gate control signal wires at different moments to control to open the corresponding buffer gates and sends the synchronous data of the branch circuits onto the acquisition bus; after the synchronous data on each branch circuit is sent to the acquisition bus, the sequential logic circuit sends a latch signal to the latched / series shift register to load the synchronous data into the latched / series shift register; and the latched / series shift register outputs the loaded data in a series form to form a high speed data stream under the control of a serial clock. According to the acquisition circuit disclosed by the invention, the requirement on working of an electroencephalogram detection device is met.

Description

technical field [0001] The invention relates to a data collection circuit for EEG detection, which collects multiple high-speed data streams into a higher-speed data stream according to a defined data format (frame structure), so as to facilitate transmission and communication with computers. to connect. Background technique [0002] With the development of modern medical diagnostic technology, in recent years, people have begun to detect and study the bioelectrical activity (event-related potential) generated by the thinking activities of the human brain, which requires wider and wider frequency bands for collecting EEG signals. , and EEG signals often require multi-channel simultaneous acquisition, and the bandwidth of each channel can reach up to 0-2000Hz, which requires the sampling frequency of each channel to be at least above 4KHz. [0003] For the weak EEG signal, it is often accompanied by a much larger interference signal. Amplifying the EEG signal will inevitably...

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Problems solved by technology

[0005] Therefore, the existing conventional digital electroencephalograph does not solve the problem of wide bandwidth (0-2000Hz), high precision (24 bits), and high sampling rate sampling of multiple EEG signals at the same time.

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