Synchronization of asynchronous data signals

Details Synchronization of asynchronous data signals Synchronization of asynchronous data signals

1987-06-04

1988-12-13

Pellinen, A. D.

Pulse or digital communications

Spread spectrum

Direct sequence

375118, 370102, H04C 704

Patent

active

047916524

ABSTRACT:
An asynchronous data signal is synchronized by stuffing in dependence upon phase differences between the asynchronous signal and a resultant synchronized signal. The synchronized signal comprises tdm frames each including data bits and a stuffing opportunity bit, and a plurality of frames constitute a superframe in which different frames have different numbers of data bits. To compensate for the biassed timing of stuff requests which would otherwise occur relative to the frame timing in the superframes, the threshold value with which the phase difference is compared to produce the stuff requests is modified with a stepped sawtooth waveform having a period equal to that of the superframe.

REFERENCES:
patent: 3830981 (1974-08-01), Gruber et al.
patent: 4007421 (1977-02-01), Lien
patent: 4397017 (1983-08-01), Rokugo

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