Representation of the normal and abnormal electrogastrography (EGG) signals based on Instantaneous Frequency Estimation / Maherah Jamaluddin

Gastrointestinal signals is the signal that is produced due to the electrical activity of the stomach. In this project, normal and abnormal electrogastrography (EGG) signals are analyzed using time-frequency analysis or namely Instantaneous Frequency (IF) estimation technique to extract the features that best describe the electrogastrography (EGG) signals. Central Finite Difference (CFD) and Instantaneous Energy (IE) estimation is the combination method of Instantaneous Frequency (IF) estimation used that plays an important role and concept in time-frequency analysis. Central Finite Difference (CFD) is a single phase differencing operation that is used to estimate the discrete-time instantaneous frequency while Instantaneous Energy (IE) estimation is used to characterize the temporal behavior, which is the instantaneous energy of the signal that varies with time. During the analysis, the varieties of the pattern data from all the EGG signals are observed using the Digital Signal Processing Toolbox in MATLAB mathematical software. The familiarity between the theoretical and simulation are distinguished and evaluated. Results demonstrated that the IF estimation technique can be used to characterize the EGG signals. It is found that the CFD technique is able to extract the important parameters of the EGG signals because it is able to detect and differentiate directly the change in frequency and energy of the particular signal.