Apparatus for receiving digital signal

Details Apparatus for receiving digital signal Apparatus for receiving digital signal

1989-09-20

1991-03-26

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

375120, 381 2, H04L 710

Patent

active

050035576

ABSTRACT:
A digital signal is received in which synchronization data is inserted at a predetermined period and in which a timing signal is synchronism with the synchronization data is developed from a digitally modulated input digital signal. A circuit generates detection signals indicative of a sampling frequency of the input digital signal on the basis of the synchronization data. A first window generating circuit generates signals of different frequency based on stable clock signals and uses the detecting signals to select one of the signals as a first reference signal. A second window generating circuit generates a second signal in synchronism with the synchronization data on the basis of an output signal from a phase-locked loop. A selector supplies the first reference signal to the phase-locked loop for a period during which the loop becomes stable and supplies the second reference signal to the phase-locked loop after expiration of the period, thereby enabling the generation of stable timing signals with respect to an input digital signal having different sampling frequencies.

REFERENCES:
patent: 4481546 (1984-11-01), Ito et al.
patent: 4561101 (1985-12-01), Pinsard et al.
patent: 4596963 (1986-06-01), Lawton et al.
patent: 4787097 (1988-11-01), Rizzo
patent: 4918406 (1990-04-01), Baumbach et al.

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