Patent ID: 9322711
Filing Date: 2016-04-26
CPC Classification: G01J,G01N,H01J,H03F

Claim Text:
1. A light signal detecting circuit, comprising: amplifying means for amplifying an analogue detection signal corresponding to an amount of light detected by light detecting means; analogue-to-digital converting means for converting the analogue detection signal amplified by the amplifying means to a digital detection signal; threshold determination means for: repeating a process to detect a pulse from the digital detection signal obtained by the analogue-to-digital converting means and detect energy of the detected pulse; calculating an occurrence frequency of the pulses of each value of the energy; and determining a pulse determination threshold based on the calculated occurrence frequency of the pulses of each value of the energy; and threshold processing means for outputting, as a detection signal, the digital detection signal including the pulses of the values of the energy not lower than the pulse determination threshold determined by the threshold determination means.