Pulse or digital communications – Synchronizers – Phase displacement – slip or jitter correction
Patent
1994-03-30
1996-09-24
Bocure, Tesfaldet
Pulse or digital communications
Synchronizers
Phase displacement, slip or jitter correction
327147, H03D 324
Patent
active
055598420
ABSTRACT:
A reference frequency generator is described which obtains its frequency accuracy from the network timing signal available on the public switched telephone network. A digital logic array compares the output of an oven-controlled crystal oscillator to the network timing signal in order to develop digital samples, the values of which represent the differences in frequency between the network timing signal and the output of the oscillator. A frequency error is computed in a processor by comparing each digital sample to an expected value. The frequency error is stored in a data set only if it is less than a predetermined threshold level, thereby immediately excluding samples which may be generated during an outage or impairment of the transmission system which delivers the network timing signal. The data set is used to compute a statistical best estimate of the frequency error, and this best estimate is then used to generate a voltage which is applied to a frequency-controlling input of the oven-controlled crystal oscillator.
REFERENCES:
patent: 4594563 (1986-06-01), Williams
patent: 4787096 (1988-11-01), Wong
patent: 4827225 (1989-05-01), Lee
patent: 4833425 (1989-05-01), Culican et al.
Bocure Tesfaldet
Lucent Technologies - Inc.
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