Automatic frequency control in a radio communication receiver

Details Automatic frequency control in a radio communication receiver Automatic frequency control in a radio communication receiver

1994-01-31

1995-10-10

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

375358, 4551822, H04L 2706

Patent

active

054577160

ABSTRACT:
A selective call radio frequency (RF) communication device (105) includes a receiver (203) for receiving and converting an RF signal into a converted signal. A controller (206) generates binary message information, a synchronization command signal and an address detection signal. An alert device (207) indicates the receipt of the message information. A frequency counter (427) measures the frequency of the converted signal and also determines the associated binary state of the binary message information. A measurement memory (439) stores the converted signal frequency measurements. The frequency control generator (440) generates a frequency control signal in response to the synchronization command signal being generated. The frequency control signal is a function of the stored converted signal frequency measurements and the associated binary states. The controllable local oscillator (215) supplies a local oscillator signal to the receiver, the local oscillator signal having a frequency controlled by the frequency control signal.

REFERENCES:
patent: 4570125 (1986-02-01), Gibson
patent: 4621366 (1986-11-01), Cain et al.
patent: 4823123 (1989-04-01), Siwiak
patent: 4947409 (1990-08-01), Raith et al.
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5157694 (1992-10-01), Iwasaki et al.
patent: 5239306 (1993-08-01), Siwiak et al.
patent: 5276706 (1994-01-01), Critchlow

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