Generally speaking, in the analog c

Generally speaking, in the analog computer and input signal, all kinds of noise and periodic interference may be contained in the signal applied to the system by the single-chip computer filter, which mainly comes from the measurement itself, the sensor and the external interference. In order to accurately measure and control the measured signal, the noise and external interference in the measured signal transmission must be reduced and eliminated. For such signals, a double integral a/d signal converter with an integral signal and time length equal to an integral multiple of 20ms can effectively weaken and eliminate its effects. The latter is a random signal, it is not a periodic signal. For random interference, we can usually use digital filtering to periodically weaken or effectively filter it. The so-called digital filtering is to determine the degree and proportion of the application's reduction of noise and interference in the useful periodic signal through a certain method of calculation or analysis. Therefore, digital filtering itself is essentially an application program filtering. Digital filtering method overcomes the shortcomings of traditional analog computer filter. Compared with the disadvantages of traditional analog computer filter, it has the following main advantages: