Object identification system

US5825299A · kind A · utility

Assignee

• EM Microelectronic-Marin SA · CH

Inventors

• Vincent Fuentes · Peseux, CH
• Hans Ulrich Fritsch · Eckental, DE
• Andreas Merz · Freiberg am Neckar, DE
• Georg Plasberg · Endingen am Kaiserstuhl, DE
• Wolfgang Kraft · Leonberg, DE

Key dates

• Filing date: Apr 17, 1996
• Grant date: Oct 20, 1998
• Expiry date: Apr 17, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G07C9/21
• WIPO field: Control
• WIPO sector: Instruments

Abstract

An object identification system comprises a transceiver (1) and a transponder (30) including memories (33,34) for storing an identification code identifying the transponder. Circuits (35, 36, 37, 38) generate an identification signal representative of the identification code such that the identification signal is modulated by bits of the identification code. Circuits (8, 9, 10, 11, 12) of the transceiver receive and interpret the identification signal. The transponder includes a variable code generator (32) and a controller (31) for controlling the writing of the variable code into memory (33) so that the variable code constitutes part of the identification code. The variable code may be a random or pseudo-random code.