Title:
NON-CONTACT IC CARD READER/WRITER AND RECEPTION CONTROLLER FOR THE SAME
Document Type and Number:
Japanese Patent JP2011109531
Kind Code:
A
Abstract:
To reduce the frequency of the occurrence of a communication errors caused by a null state.
Signals received by an antenna unit 30 are inputted from two points (both ends of an inductance element L21) having different impedance to generate demodulation signals Q1, Q2 by two systems of demodulation circuits (demodulation processing portions 41, 42 and binarizing portions 43, 44). Then, a decoding control portion 45 selects either (normal one) of the two systems of the demodulation signals Q1, Q2 to generate reception data (NRZ code) and outputs the generated data. For the selection and determination of the signal, a reception start position or a result of the detection of a decoding error is used.
Inventors:
HAGIWARA KOJI
Application Number:
JP2009264137A
Publication Date:
June 02, 2011
Filing Date:
November 19, 2009
Export Citation:
Assignee:
FUJI ELECTRIC RETAIL SYSTEMS
International Classes:
H04B1/59; G06K17/00; H04B5/02
Domestic Patent References:
| JP2008028852A | 2008-02-07 | |||
| JP2008167259A | 2008-07-17 | |||
| JPS62137933A | 1987-06-20 |
Attorney, Agent or Firm:
Yoshiyuki Osuga