Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1997-04-07
1999-10-05
Bost, Dwayne D.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
4551822, 4551922, 370344, H04Q 732, H04Q 730
Patent
active
059638516
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 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. These thresholds are used by the AFC control processor (105) to efficiently control the predetermined frequency range of the tunable transceiver (101) for most efficient operation.
REFERENCES:
patent: 5493714 (1996-02-01), Cahill
patent: 5564091 (1996-10-01), Goldinger
patent: 5694389 (1997-12-01), Seki et al.
patent: 5697068 (1997-12-01), Salvi et al.
patent: 5774799 (1998-06-01), Croft et al.
Blanco Alejandro G.
Emami Shahriar
Miller Jianping
Young Richard S.
Bost Dwayne D.
Gantt Alan T.
Motorola Inc.
Scutch, III Frank M.
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