System for identifying objects equipped with an automatic transponder

Abstract From the Canadian patent

Abstract of the Disclosure There is described a system for interrogating objects equipped with an automatic transponder in which a fixed station transmits an interrogation signal formed by at least two pulses and the transponder returns a coded response consisting of a plurality of pulses. The time interval between two successively transmitted trains of interrogation signals represents an item of information which determines which set of addresses is to be selected from a number of sets recorded in a memory these addresses con-, trolling an address controlling circuit associated with a parallelinput, series-output multiplexing circuit which supplies a response code in which the positions of …