Abstract
It is assumed that linear time-invariant (LTI) system input signal
samples are updated by a sensor in real time. It is urgent for every new
input sample or for small part of new samples to update an ordinary
convolution as well. The idea is that well-known convolution sum
algorithm, used to calculate output signal, should not be recalculated
from the begining with every new input sample. It is necessary just to
modify the algorithm, when the new input sample renew the set of
previous samples. The recursive algorithm is worked out for such a
purpose. Example of recursive computation of the convolution is
presented. Conclusion is given.