Circuit arrangement for correcting frequency errors during a tra

Details Circuit arrangement for correcting frequency errors during a tra Circuit arrangement for correcting frequency errors during a tra

1978-12-15

1980-11-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 84, 375 88, 375 97, 455257, H03F 910

Patent

active

042362490

ABSTRACT:
A circuit arrangement is disclosed for correcting frequency errors during a transmission of data by means of data signals which are modulated according to a frequency-differential phase modulation. The circuit arrangement corrects frequency errors which occur during the transmission of the data signals from a data transmitter to a data receiver. The data receiver contains a regulating stage inside which the data signals are converted with the assistance of mixed signals. A repetition frequency of the mixed signals is regulated with the assistance of a first regulating unit performing a fine regulation and a second regulating unit performing a coarse regulation in such a way that frequency errors of the data signals are corrected. A regulator generates the mixed signals from timing pulses of given repetition frequency with the assistance of frequency multipliers. The frequency multipliers are controlled by regulating signals which optionally switch through a selection unit to the regulator from either the first regulating unit or the second regulating unit.

REFERENCES:
patent: 3036157 (1962-05-01), Franco
patent: 3445593 (1969-05-01), Greg et al.
patent: 3447085 (1969-05-01), DeHaas et al.
patent: 3456194 (1969-07-01), Burger
patent: 3485949 (1969-12-01), DeHaas
patent: 3921103 (1975-11-01), Burger
patent: 3947633 (1976-03-01), Burger

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