  In the study of quantum random number generators (QRNGs), the problem of
random signal digitization is often not considered in detail. However, in the
context of a standalone QRNG device, this issue is very important. In this
paper, we consider the problem of digitizing laser pulses with random intensity
and analyze various approaches used to estimate the contribution of classical
noise. A simple method for determining the quantum reduction factor suitable
for digitization with an analog-to-digital converter is proposed.
