In this paper we present the possibility of sampling and reconstruction of periodical signals using a sampling frequency, which can be smaller than the lower limit of signal's frequency interval. We consider that the period of the periodical signal x(t) is well known or it can be determined, so it components will be harmonics from the basic period, which is not present in this signal. The conditions for the number of taken samples should meet are also presented, so base on that, the reconstruction of the initial signal can be done. At the end of the essay is presented a very simple method of calculating the minimum number of these samples that we have to take.
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