Study On The System Of Neural Signal Acquisition And Stimulation

The method of stimulating nerves with neural tiny electrode can cure infantile paralysis,splitting headache,blindness,deafness stubborn chronic ache and epileptic, and the doctors also need true neural signal to supply evidence for Pathology diagnosis. This paper designs neural signal collection and stimulating system with DSP digital control system which can cooperate with neural tiny electrode to get neural signal and display on LCD screen at length.At the design of artificial circuit ,the dissertation achieves neural signal modulation circuit which includes prepositive input amplification system, second-order high pass filter circuit, second-order low pass filter circuit, gain regulating circuit and 50Hz rejectorand and neural signal stimulating circuit which includes square-wavegenerator, tristate frequency regulating circuit,and V/I transl-ation circuit.The dissertation use DSP as the central processing unit of digital circuit including collect-ion unit, memory unit, display unit which achieves control and signal disposal of the whole system. We use C language and compilation language to compile the software of the system.The dissertation also tests some different performances of neural signal modulation cir-cuit including gain testing, frequency response, small-signal testing and interfere- nce analysis, which proves that the circuit has very high common-mode rejection atio,high input impedance,low noise,low drift. The system makes use of cooperation of artificial circuit and digital circuit to produce tristate neural stimulating signal and achieve signal collec-tion and LCD screen real time display of stimulating .The result of testing shows that the system can carry out collection and stimulating of neural signal.