Method and system for contactless exchange of data between a rea

Details Method and system for contactless exchange of data between a rea Method and system for contactless exchange of data between a rea

1996-11-29

2000-01-11

Holloway, III, Edwin C.

Communications: electrical

Continuously variable indicating

With meter reading

H04Q 148

Patent

active

060140887

ABSTRACT:
A method and system for contactless exchange of information between a read/write unit and at least one information carrier, using wireless radiofrequency signal transmission including an input/output circuit and associated coil device and the information carrier including another input/output circuit and associated coil device, and each further including a processing circuit. The read/write unit transmits radiofrequency signals divided in time slots, each successively including a sync pulse and a single data bit. The radiofrequency signal is suppressed in each time slot for a period differing in length for the one and the zero data bit. The data bit signal, received in the read/write unit solely during transmission of the radiofrequency signal, is sampled, after rectification, for detection of the data bits of the information carrier. The read/write units is provided with a detector having two sample and hold circuits in parallel, to which the input signal after rectification is applied in parallel and to which sampling pulses are applied by the processing circuit for sampling successively in time of the signal.

REFERENCES:
patent: 5218343 (1993-06-01), Stobbe
patent: 5266926 (1993-11-01), Beigel
patent: 5313198 (1994-05-01), Hirano
patent: 5347263 (1994-09-01), Carroll et al.
patent: 5376932 (1994-12-01), Samokine et al.
patent: 5533067 (1996-07-01), Jamal
patent: 5548291 (1996-08-01), Meier

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