Circuit arrangement for correcting frequency errors during a transmission of data
US4236249A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1978 |
| Grant date | Nov 25, 1980 |
| Priority date | — |
| Expiry date | Dec 15, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2272
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.