Method and an arrangement for minimizing a phase difference betw

Details Method and an arrangement for minimizing a phase difference betw Method and an arrangement for minimizing a phase difference betw

1993-10-26

1996-07-02

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

327161, 375260, H04L 700

Patent

active

055330738

ABSTRACT:
A method and an arrangement for effecting a smooth or undisturbed changeover between at least two binary datastreams, by minimizing the phase difference between the datastreams prior to changeover. The datastreams are fed into a phase-synchronizing arrangement, where each datastream passes through a respective delay unit and is passed further to a switch device. According to the invention, the datastreams are tapped to a control unit which is connected between the delay units and the switch device and in which a determined number of random samples are taken from the datastreams. The binary amplitudes of the samples are compared mutually in an amplitude comparison circuit, whereafter a mean value of those samples that have mutually the same binary amplitudes is formed in a mean value forming circuit. The result obtained in the mean value forming circuit forms an actual value, which is compared in a comparison circuit with a predetermined reference value. One of the datastreams is thereafter delayed and a new phase-synchronization process is commenced. Alternatively, if the comparison shows that the actual value at least substantially corresponds to the reference value, a changeover between the datastreams can take place.

REFERENCES:
patent: 4827490 (1989-05-01), Guerin
patent: 5077761 (1994-12-01), Takunaga

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