Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2006-08-08
2006-08-08
Tran, Khanh (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C329S300000
Reexamination Certificate
active
07088790
ABSTRACT:
In demodulation of a FSK signal, a circuit for detecting a center level of said signal and correcting an error thereof is provided. Said circuit can accomplish the detection of the center level correctly always even if there exist cords with various lengths in a length of “1” or “0” of a synchronizing signal at beginning of communication and during communication, and yet frequency variation happens at that time.Said circuit has sample hold circuits SH1and SH2each of which are provided so as to correspond to “1” and “0” of an input demodulated data signal. In said circuit a center level value is an average value of voltages held in said sample hold circuits when said signal changes from “1” to “0” or “0” to “1” and a center level value is obtained by adding or subtracting a voltage of ½ of difference between two hold voltages held in another sample hold circuit SH3to or from a hold voltage in a receiving side at present time when said signal keeps “1” or “0” continuously.Data information is judged by a compartor of which a reference value is anyone of said two center level value.
REFERENCES:
patent: 5111152 (1992-05-01), Makino
patent: 6122330 (2000-09-01), Motohashi
patent: 6188733 (2001-02-01), Kawai
patent: 6529565 (2003-03-01), Kawai
patent: 6570937 (2003-05-01), Kawai
patent: 6633752 (2003-10-01), Hashigaya
patent: 6891905 (2005-05-01), Malone et al.
Flynn ,Thiel, Boutell & Tanis, P.C.
General Research of Electronics Inc.
Tran Khanh
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