Method and apparatus for synchronizing electrical signals

Details Method and apparatus for synchronizing electrical signals Method and apparatus for synchronizing electrical signals

1978-07-21

1980-10-21

Heyman, John S.

Pulse or digital communications

Spread spectrum

Direct sequence

328155, H04L 2536

Patent

active

042298245

ABSTRACT:
In the disclosed method and apparatus, a local generator signal is initially generated with a phase that is arbitrary with respect to the input signal. Subsequently, the phase difference between any two successive bits of these signals is measured. Then the phase of the local generator signal is changed in a direction which decreases the measured difference by an amount proportional to the measured difference divided by the total number of phase measurements made. This produces a new local generator signal. These phase measuring and phase changing steps are repeated multiple times, each time using the most recently produced new local generator signal to produce another new local generator signal. By this sequence, the total phase shift from the initially generated local generator signal after N phase shifts are made is identical to the average of the N corresponding phase differences between the initially generated local generator signal and the input signal.

REFERENCES:
patent: 3544717 (1970-12-01), Smith
patent: 3614635 (1971-10-01), La Pine et al.
patent: 3671776 (1972-06-01), Houston
patent: 3755748 (1973-08-01), Carlow et al.
patent: 3781706 (1973-12-01), Osborne et al.
patent: 3908084 (1975-09-01), Wiley
patent: 3980820 (1976-09-01), Niemi et al.
patent: 4019138 (1977-04-01), Watanabe et al.
patent: 4080576 (1978-03-01), Huber et al.

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