Apparatus for totaling/analyzing replies using infrared optical communication, and signal amplifier suitable for that apparatus

摘要

This invention is concerned with an apparatus for totaling and analyzing replies for totaling and analyzing replies to presented questions at meetings and conferences. The purpose is make setting and removing easier expand its use by changing known apparatus for totaling and analyzing replies to wireless diminishing wired connection between replying unit and center apparatus. In this invention, each of replying units has its identification code, and a space transmitting infrared light is used for communications between replying units and a center apparatus. Replying signals from the replying units are sent at each replying period designated to each replying unit by the identification code obeying a command signal from the center apparatus. The center apparatus recognizes the code of the replying unit, which sent signals for received replying signals from the timing of the signal and uses for totaling and analyzing. For amplification of received signals a novel amplifying function of a feedback resistors connecting between the input and the output terminal of an electronic device in which an input voltage exceeds a fixed value a transition of the output voltage occurs. The apparatus for totaling and analyzing replies in this invention can have applications at large meetings with many attendants, in addition to the applications at meetings where wire connected known apparatus have been used more conventionally.