Timing signal regenerator for phase-adjusting a reception timing

Details Timing signal regenerator for phase-adjusting a reception timing Timing signal regenerator for phase-adjusting a reception timing

1987-11-09

1989-07-18

Jennings, Derek S.

Pulse or digital communications

Spread spectrum

Direct sequence

375 8, 375 42, 375 67, 375 83, 331 1A, H04L 700

Patent

active

048499978

ABSTRACT:
In a timing signal regenerator of a modem which receives a reception modulated signal in a digital communication network, first and second timing signals are generated with the second timing signal generated at first for use as a local timing signal of a predetermined frequency. An A/D converter (26) converts the reception modulated signal to a digital modulated signal in synchronism with the local timing signal. A processor (27) processes the digital modulated signal into a discrete signal in synchronism with the first timing signal. From the discrete signal, an extractor (28) extracts phase error information which becomes at first to be related to a first phase difference between the first timing signal and the reception modulated signal and phase-controls the first timing signal into a reception timing signal. Controlled by a control signal, the reception timing signal is kept in phase synchronism with the reception modulated signal. Furthermore, the phase error information becomes to be related to a second phase difference between the second timing signal and the reception timing signal and frequency-controls the second timing signal into a transmission timing signal which is in frequency synchronism with the reception modulated signal. Preferably, the phase synchronism is decided by the second phase difference.

REFERENCES:
patent: 3883806 (1975-05-01), Delong et al.
patent: 4677645 (1987-06-01), Kaniwa et al.
patent: 4737967 (1988-04-01), Cahalan
patent: 4788696 (1988-11-01), Sakane et al.

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