Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1995-09-08
1997-12-30
Chin, Wellington
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
370505, H04J 306, H04L 704
Patent
active
057039151
ABSTRACT:
For this system and for this equipment there has been provided a phase alignment device (30) which has an access for input data (50) applied to an access (51) at a rate of a first clock signal, and an access (70) for producing at the rate of a second clock signal applied to an access (71) a justifiable data stream, in which stream bits can be inserted or deleted. The data are written and read in and from a common memory (60) by means of a write counter (55) and a read counter (80), respectively. A comparing element (90) measures the difference of the contents of said counters (55) and (80). With each variation of this difference, intermediate steps are added with the elements (95), (97) and (98), so that the means (92) controlling the justification can be formed by a sigma-delta modulator which has a 0.5 threshold.
REFERENCES:
patent: 5027120 (1991-06-01), Thurston
patent: 5325399 (1994-06-01), Haspeslagh et al.
patent: 5469475 (1995-11-01), Voorman
patent: 5493589 (1996-02-01), Ibenthal
patent: 5504752 (1996-04-01), Okazaki
patent: 5537447 (1996-07-01), Urbansky
Albert Patrick
Vergnes Alain
Chin Wellington
Goo Jimmy
Hyun Soon-Dong
Lucent Technologies - Inc.
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