Document Type
Thesis
Date of Award
5-31-1985
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Stanley S. Reisman
Second Advisor
Dale Thorpe Teaney
Third Advisor
W. H. Warren Ball
Abstract
An instrument has been designed to analyze 16 channels of EEG of a squirrel monkey by using several interface boards controlled by an Apple II computer. This instrumentation system is capable of performing these experiments in an automated manner. It stores the data generated on to a floppy disk, with software control and results may be printed out together with related graphs. Because of the limitation of the floppy disk capacity, we had only developed two versions:
(1) To average the EEG signal up to 8 times for all 16 channels, because a lot of memory is needed to save both the EEG data and the spectra.
(2) To average the EEG signal up to 16 times for all 16 channels, because we do not use memory to store the EEG data after we finish the analysis of the spectra. In other words, we store the EEG spectra results without saving the EEG data in memory.
For the first version, we save the EEG signals and the spectra on to the floppy disk. For the second version, we erase the EEG signals by storing the spectra in the same memory locations of floppy disk. This is why version two can do double the averaging than version one. The system will not only be used for the two versions mentioned above but also large disk memory usage may be possible in the future by using a hard disk. For flexibility, we wrote the program to ask the user some questions for specific applications. Morever, in the hardware circuit we added some indicating LEDs for troubleshooting purposes. The signals driving these LEDs can also be used as control signals to communicate with other functional boards if future modifications are required. The user initializes the system by keying in the answers to requests, such as the channel number, sweep number, average times ...etc. The printout will consist of a list of data, spectrum picture and histogram with a format especially created for easy reading and analysis. The program executes totally without any human intervention.
Recommended Citation
Chiang, Junnyih, "16-channel signal analyzer for electroencephalograms" (1985). Theses. 3480.
https://digitalcommons.njit.edu/theses/3480
