Frequency shift modulation automatic frequency correction circui

Details Frequency shift modulation automatic frequency correction circui Frequency shift modulation automatic frequency correction circui

1997-12-23

2000-10-10

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

4551922, H04L 2706

Patent

active

061309214

ABSTRACT:
A method (900) and circuit (400) for automatic frequency correcting a frequency modulated (FM) digital signal determines a frequency offset value of the detected FM signal during a preamble portion of the FM digital signal, generates an offset corrected signal by removing the frequency offset value from a detected FM signal (440), and generates a frequency corrected signal (460). The frequency corrected signal is generated by selecting the offset corrected signal during the preamble portion, selecting the detected FM signal after the end of the preamble portion when a magnitude of the frequency offset value of the detected FM signal is below a predetermined threshold (445), and otherwise selecting the offset corrected signal after the end of the preamble portion.

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