Automatic frequency control (AFC) system and method using an...

Details Automatic frequency control (AFC) system and method using an... Automatic frequency control (AFC) system and method using an...

2005-12-27

2005-12-27

Maung, Nay (Department: 2684)

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

C455S077000, C455S087000, C455S182100, C455S182200, C455S182300, C455S192100, C455S192200, C455S192300, C375S344000

Reexamination Certificate

active

06980775

ABSTRACT:
A radio device requires a tunable transceiver such that the transceiver can be accurately set to a desired frequency. When a signal with known frequency accuracy is being received, an offset detector can determine the frequency offset generated by the transceiver due to improper tuning. An automatic frequency control (AFC) system (100) is comprised of a tunable transceiver, an adaptive detector (102) for comparing an incoming sample from the tunable transceiver to an adaptive maximum deviation threshold for determining if a sample from the tunable transceiver should be used for the direct current (DC) component of the AFC, an offset detector (103) and an AFC control processor (105) for utilizing information from the offset detector to reduce the inaccuracy in frequency by tuning the transceiver towards the received signal frequency. The AFC control processor (105) utilizes one of more threshold levels for defining a maximum correction threshold (311) based upon the desired maximum offset correction.

REFERENCES:
patent: 5233633 (1993-08-01), Baum et al.
patent: 5552838 (1996-09-01), Suizu
patent: 5594757 (1997-01-01), Rohani
patent: 5678223 (1997-10-01), Callaway et al.
patent: 5963851 (1999-10-01), Blanco et al.
patent: 6148187 (2000-11-01), Chiba
patent: 6522696 (2003-02-01), Mobin et al.

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