Pulse or digital communications – Receivers – Automatic frequency control
Patent
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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Powell, II Clinton C
Webster James Rodney
Bayard Emmanuel
Lamb James A.
Motorola Inc.
Pham Chi H.
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