Title:
NON-CONTACT DATA-TRANSMITTING/RECEIVING METHOD AND DEVICE FOR EXECUTING THE METHOD
Document Type and Number:
Japanese Patent JP3179342
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To accelerate communication from a questioner to a responder and to improve accuracy, without requiring any precise internal reference clock for the responder by demodulating a command or data by discriminating a change in the frequency of transmitted carrier wave, when the difference of count number is settled within a prescribed threshold value.
SOLUTION: The number of carrier waves of 1/N of the number of carrier waves, consisting of one bit of digital data transmitted by a questioner 1 and during such time, counting is performed at plural kinds of timing while using a transmitter 10 built in an IC. These plural count numbers are compared and it is discriminated whether the difference of count numbers is more than the threshold value or less than it. By using such transition in the count number, the digital data are demodulated. Therefore, the digital data can be demodulated without being affected by dispersion in the oscillation frequency of the oscillator 10 to be used for a high-speed counter and further, without necessity for a responder 2 to return a signal for synchronism acquisition to the questioner 1, in order for the questioner 1 to match synchronism with the responder 2.
Inventors:
Shiro Kano
Toshiki Koshi
Toshiki Koshi
Application Number:
JP17400096A
Publication Date:
June 25, 2001
Filing Date:
July 03, 1996
Export Citation:
Assignee:
YAMATAKE CORPORATION
International Classes:
H04B1/59; H04B5/00; G06K17/00; (IPC1-7): H04B1/59; G06K17/00
Domestic Patent References:
| JP894743A | ||||
| JP9284173A |
Attorney, Agent or Firm:
Hiroaki Tazawa (1 person outside)
Previous Patent: 調整可能なブーツキーパー
Next Patent: HELICAL ANTENNA AND ANTENNA SYSTEM, EQUIPPED WITH THE HELICAL ANTENNA AT TIP THEREOF
Next Patent: HELICAL ANTENNA AND ANTENNA SYSTEM, EQUIPPED WITH THE HELICAL ANTENNA AT TIP THEREOF