Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1988-11-17
1991-12-03
Olms, Douglas W.
Pulse or digital communications
Spread spectrum
Direct sequence
377107, 328 73, H04L 2538
Patent
active
050705172
ABSTRACT:
In order to adjust the frequency of an oscillator in a substation of a network to a reference frequency of the network, a reference station is provided with a high precision oscillator which is connected to a clock input of a counter. If this counter has a defined counting state, a start signal is generated and transmitted to said substation. At another defined counting state a stop signal is generated and transmitted to said substation. In the substation the oscillator to be adjusted is connected to a local counter, which counts the pulses of the oscillator between said start and stop signals. The count of this counter then is used as a measure for the frequency deviation of the oscillator and can be used for generating a control signal to adjust the frequency of the oscillator of the substation.
REFERENCES:
patent: 3247491 (1966-04-01), Du Vall
patent: 3388216 (1968-06-01), Brooke et al.
patent: 4196416 (1980-04-01), Stein
patent: 4651103 (1987-03-01), Grimes
patent: 4811365 (1989-03-01), Manno
International Conference on Communications, Jun. 14-16, 1976, Dr. H. A. Stover: "Timing and Synchronization of Switched Digital Communications Networks", pp. 25-1 to 25-6.
Kochler Helmut
Nestler Gunter
Bocure Tesfaldet
Erika Kochler
Olms Douglas W.
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