Title:
PSK信号のキャリア同期型復調装置
Document Type and Number:
Japanese Patent JP4159187
Kind Code:
B2
Abstract:
A proximity IC card (PICC) which relates to and provides a carrier synchronization type demodulator, which is able to stably receive a PSK signal from a PICC and is enhanced in noise immunity, and which is realized at a low cost and in such a way as to have a small size. The carrier synchronization type demodulator is adapted to receive and demodulate PSK-modulated subcarrier signals to be synchronized with and superposed onto a sent carrier signal. This demodulator includes a carrier detecting device for detecting the subcarrier signals successively received in a predetermined time, a phase-change-point detecting device for detecting a phase change point of the subcarrier signal after the subcarrier signal is detected, and a data reception control device for controlling the reception of data of a predetermined format by employing a moment, at which the phase change point is detected, as a synchronization start point for receiving data, and by using an internal clock that is synchronized with the sent carrier signal by using the moment as a starting point of synchronization.
Inventors:
Yusuke Kawasaki
Yoshiyasu Sugimura
Shigeru Hashimoto
Yoshiyasu Sugimura
Shigeru Hashimoto
Application Number:
JP21713299A
Publication Date:
October 01, 2008
Filing Date:
July 30, 1999
Export Citation:
Assignee:
富士通株式会社
富士通フロンテック株式会社
富士通フロンテック株式会社
International Classes:
G06K17/00; G06K19/07; H04L27/227; H04L27/22
Domestic Patent References:
| JP11068865A | ||||
| JP9294148A | ||||
| JP10240636A | ||||
| JP10090405A | ||||
| JP9172468A | ||||
| JP63086641A | ||||
| JP1170251A | ||||
| JP1218245A |
Attorney, Agent or Firm:
Takashi Ishida
Jun Tsuruta
Shigeru Tsuchiya
Masaya Nishiyama
Higuchi Souji
Jun Tsuruta
Shigeru Tsuchiya
Masaya Nishiyama
Higuchi Souji