SPIKE NOISE ELIMINATING METHOD OF DIGITAL SIGNAL

摘要

PURPOSE:To decrease noise components, by weighting equidistantly a digital signal in response to the fetching separate time, comparing the averaged and corrected value with the original value and delivering the corrected value when the difference between the original value and the corrected value exceeds the set value. CONSTITUTION:The digital onput signal, e.g., IN is fetched and stored in a register 3 by a central processor 1 for each timing pulse supplied from a timer circuit 2. Then the desired value an is successively shifted and given to an arithmetic circuit 4 with a single unit of an-1-an-3 existing before and after a digital signal (an). Then the data on the unit block is fetched by the circuit 4 and then added after performing the weighting corresponding to the shift of the fetching time. Thus the corrected value (an) is obtained and fed to a comparator 5. The comparator 5 compares data (an) with (an'). When the difference between both data is within the set range of a setting device 6, the data an is selected and transmitted as an output signal OUT. While the corrected value (an') is selected and delivered in case the difference between both data exceeds the set range.