Electromagnetic wave signal processor and electromagnetic wave detector

An electromagnetic wave detector comprising:

• a plurality of signal sources each of which detects an electromagnetic wave to output a current pulse signal:
• and
• an electromagnetic wave signal processor comprising a plurality of signal processing unit each processing the pulse signal output from each of the signal sources,
• each signal processing unit comprising:
• a peak detecting circuit to detect peak values of each amplitude of the pulse signal output from each of the signal sources;
• an AD converter to convert the peak values into digital signals;
• a memory device comprising a plurality of memory cells each of the memory cells having an address assigned in accordance with each of values capable of being taken by the digital signals of the peak values, and each of the memory cells being able to have any one of a plurality of internal states representing detection frequencies of the peak values and be changed among the plurality of internal states;
• and
• a writing circuit to change the internal state in the memory cell that has the address corresponding to the value of each of the digital signals converted by the AD converter, so as to increment the detection frequency represented by the internal state.