Automatic frequency control circuit

Details Automatic frequency control circuit Automatic frequency control circuit

1997-05-19

1999-06-29

Chan, Jason

Pulse or digital communications

Receivers

Automatic frequency control

375371, H04L 2706

Patent

active

059178647

ABSTRACT:
A signal from a differential detecting section is decoded by a data decision section and is inputted into a detection area judging section. In the detection area judging section, synchronous word patterns such as a unique word periodically inserted into the decoded data is detected, determination is made as to in which area the synchronous word pattern was detected, and in a case where it is judged by the capture determining section that frequency control is executed at an incorrect phase control point, a frequency deviation control section computes a control rate for a frequency deviation so that a detection area for the received signal will enter an area of a correct phase control point according to a detection area of the received signal, and the frequency deviation is corrected so that control is executed at the correct phase control point by adding a value corresponding to the control rate to an output value from the averaging filter section.

REFERENCES:
patent: 5400366 (1995-03-01), Iwamatsu
patent: 5418815 (1995-05-01), Ishikawa et al.
patent: 5594759 (1997-01-01), Iwamatsu

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