Automatic identification circuit for objects and individuals - has read head coupled to parallel time delay stages and filter circuit

摘要

An automatic identification system for objects, vehicles, individuals, etc. uses passive time delay elements to process the output of electromagnetic detectors. The read station is coupled to a receiver (AE) that has the output coupled to a number of time delays (t1,t2,t3 etc.) of specific values, connected to common lines (L). The parallel delay circuit is connected to a filter (F1) and an element (N) with a non-linear characteristic. The input signal spectrum (f1,f2,f3..fx) is converted to a signal covering a different spectrum (mf1+,-nf2+,-...2fr), and is used to control the read process.