Transponder communication device for the contactless communicati

Details Transponder communication device for the contactless communicati Transponder communication device for the contactless communicati

1998-01-20

2000-08-01

Tokar, Michael

Communications: electrical

Selective

Interrogation response

340 103, H04Q 522

Patent

active

060972785

ABSTRACT:
In a transponder communication device (1) having a selector for the successive individual selection of transponders (2) the selector having interrogator (5) for generating at least one item of interrogation information (AFI) with which the transponders (2) can be interrogated to transmit answer information (AWI) in response to the interrogation information (AFI), and time-window generator (17) for generating a series of K successive time windows (ZF) and controller (20) for the time-window generator (17), which controller can activate the time-window generator (17) so as to generate the series F of K time windows (ZF) a number of times in succession, and evaluator (22) which cooperates with the time-window generator (17) and by which, depending on the occurrence of at least one item of answer information (AWI) transmitted to the transponder communication device (1) by a transponder (2) in response to interrogation information (AFI), a transponder (2) can be selected in at least one time window (ZF) in each series (F) of the series (F) of K time windows (ZF) generated a number of times in succession.

REFERENCES:
patent: 5345231 (1994-09-01), Koo et al.
patent: 5450492 (1995-09-01), Hook et al.
patent: 5455575 (1995-10-01), Schuermann
patent: 5515053 (1996-05-01), Hecht et al.
patent: 5530702 (1996-06-01), Palmer et al.
patent: 5543797 (1996-08-01), Hochstein et al.
patent: 5543798 (1996-08-01), Schuermann

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