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Analog input signal in the acquisition process, because often the external environment, the system noise and other interference effects, resulting in reduced accuracy of the data collection, can not be measured accurately reflect the real situation of objects. To improve the accuracy of data collected so that the impact of interference to a minimum, on the one hand from hardware to be improved, such as the choice of good quality sensors, to the collection system prior to the channel filter circuit design, frequency filtering. On the other hand, controlled by the CPU, select certain algorithms, through procedural methods can also achieve frequency filtering, analog filters to complete a similar function, and this is filtering software, also called digital filtering.
Digital filtering is in the digital signal input, using figures calculated approach to the realization of digital signal processing, will enter a sequence of numbers into a group of output figures sequence, so that