Pulse or digital communications – Synchronizers
Patent
1993-01-26
1995-08-15
Chin, Stephen
Pulse or digital communications
Synchronizers
375344, 375327, 329307, H04L 2706
Patent
active
054426561
ABSTRACT:
In a timing extraction device coupled to a demodulator which derives a real signal component and an imaginary signal component from a signal received via a transmission line, a band-pass filter extracts a 1/2-Nyquist frequency from either the real signal component or the imaginary signal component. The 1/2-Nyquist frequency includes two symmetrical frequency components. A vector conversion unit processes the 1/2-Nyquist frequency so that a vector signal corresponding to one of the two symmetrical frequency components of the 1/2-Nyquist frequency is output from the vector conversion unit. A square multiplier squares the vector signal received from the vector conversion unit and thereby generates a phase error signal indicating timing information concerning the analog signal. The phase error signal has an angle which is double an angle of the vector signal.
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Kaku Takashi
Kawada Noboru
Chin Stephen
Fujitsu Limited
May Timothy J.
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