Abstract
So far, the main limit of simple statistical analysers for point processes has been their inability to perform in real time. In this paper we present a device based on the combined use of a first in, first out memory, a commercial digital signal processor, the evaluation board supplied with it by the manufacturer plus a standard personal computer. By processing a sequence of pulses while they arrive, the instrument outputs (and continually updates) a function that may be selected in advance among those commonly used in the theory of point processes: inter-event time, waiting time, correlation function or counting distributions. This real-time device is able to compute the correlation function in the case of pulse flows with intensities as high as 105 pulses per second; for other statistical functions the acceptable rate may be even higher, of the order of 3*105 pulses per second. The instrument has been tested both on deterministic signals and on laser scattering from rough surfaces; it is currently employed in zero-crossing spectral investigations, whose preliminary results are concisely reported.
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