Pulse or digital communications – Transceivers
Patent
1996-12-30
1999-05-11
Bocure, Tesfaldet
Pulse or digital communications
Transceivers
H04L5/14
Patent
active
059036001
ABSTRACT:
An automatic frequency control circuit including wideband and distortion automatic frequency control circuits for a digital transmitter-receiver circuit. The distortion automatic frequency control circuit performs a compensation function for a slight frequency variation in a frequency offset range allowed by the specification of the system to which the circuit is applied. In this case, accordingly, it is possible to maintain a stable call conversation. When a signal having a frequency being beyond a frequency tolerance of the system is generated, the wideband automatic frequency control circuit operates to perform a rapid automatic frequency tracing function. That is, the wideband automatic frequency control circuit determines whether or not the automatic frequency control signal emerging from the distortion automatic frequency control circuit has a frequency included in an automatic frequency control range and outputs a new automatic frequency control signal based on the result of the determination. Accordingly, a frequency distortion phenomenon caused by a variation in frequency is effectively prevented.
REFERENCES:
patent: 4852086 (1989-07-01), Eastmond et al.
patent: 5042082 (1991-08-01), Dahlin
patent: 5335364 (1994-08-01), Heinonen
Bocure Tesfaldet
Bushnell Esq. Robert E.
Samsung Electronics Co,. Ltd.
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