Pulse or digital communications – Synchronizers – Frequency or phase control using synchronizing signal
Patent
1997-04-04
1999-11-30
Bocure, Tesfaldet
Pulse or digital communications
Synchronizers
Frequency or phase control using synchronizing signal
375208, 375367, H04L 706
Patent
active
059955716
ABSTRACT:
An input data obtained by differential-decoding a signal transmitted from a transmitting equipment is input to a DMF. The DMF obtains a correlation value, and outputs the correlation value and data value to a maximum value detection unit. The maximum value detection unit extracts the maximum value from the correlation values output at the sampling timing, and outputs the position of the maximum correlation value (synchronous point signal) and the data value corresponding to the maximum correlation value. The synchronous point comparison unit monitors a synchronous point signal, detects whether or not a synchronous point deviates, and resets a counter based on the deviation of the synchronous point. A counter reset determination unit also monitors the synchronous point signal, and resets the counter so that the apparent position of the synchronous point can be around the center of the window when the counter value indicating the synchronous point is not in a predetermined range.
REFERENCES:
patent: 4651327 (1987-03-01), Fujita
patent: 4943975 (1990-07-01), Kurihara et al.
patent: 4968981 (1990-11-01), Sekine et al.
patent: 5090023 (1992-02-01), Watanabe et al.
patent: 5579321 (1996-11-01), Van Grinsven et al.
patent: 5832021 (1998-11-01), Kondo
Bocure Tesfaldet
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
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