Galoitica: Journal of Mathematical Structures and Applications GJMSA 2834-5568 10.54216/GJSMA https://www.americaspg.com/journals/show/2143 2022 2022 Faculty of Science, Mutah University, Jordan Rashel Abu Hakmeh This research studies the deviation of the output signal from stationary state by calculating stationary factor in differential filter with constant and non-stochastic coefficients, a stationary process is applied on its input. We show that this deviation is related to the degree of transformation the study range length and the form of a correlation function of the process applied on the input and the special solution of the equation LY=X and its correlation or un-correlation with that process. 2023 2023 29 33 10.54216/GJMSA.080203 https://www.americaspg.com/articleinfo/33/show/2143