Telegraphy – Code transmitters – Rotary contact
Patent
1975-11-04
1977-04-26
Gruber, Felix D.
Telegraphy
Code transmitters
Rotary contact
178 691, 235181, 307233R, 328133, H04L 2710, H03K 706
Patent
active
040202836
ABSTRACT:
An input MSK digital data signal is correlated with MSK correlation waveforms to produce first and second correlation signals. These first and second correlation signals are operated on by an arithmetic unit to calculate many time and phase conditions of the MSK digital data signal at one time and to produce third, fourth and fifth correlation signals as a function of assumed bit times. These third, fourth and fifth correlation signals are operated on by a ratio calculator to produce a ratio signal proportional to the ratio of a minimum magnitude squared to a maximum magnitude squared for all carrier phase angles for each of the assumed bit times. A synchronization detected signal is produced when the value of the ratio signal is less than a given amplitude threshold.
REFERENCES:
patent: 3772600 (1973-11-01), Natali
patent: 3789307 (1974-01-01), Clark
patent: 3838214 (1974-09-01), Lind
Gruber Felix D.
Hill Alfred C.
International Telephone and Telegraph Corporation
O'Halloran John T.
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