The adaptive filters in the suppression of interference on signal lines

Adaptive active filters can be successfully used to filter out interference on power and signal lines, where passive filters have great limitations especially if the interference is at low frequency and is known to drift slowly. Two solutions of adaptive filters are examined: the conventional LMS (Least Mean Square) filter and the LMS filter with trainer units, which have the best filtering characteristics for both analog and digital signals. Some simulations are performed and the results of both solutions are compared.