Automatic frequency control arrangement

Details Automatic frequency control arrangement Automatic frequency control arrangement

1994-08-03

1996-06-25

Chin, Stephen

Pulse or digital communications

Receivers

Automatic frequency control

455324, 455258, H04L 2706

Patent

active

055307230

ABSTRACT:
An automatic frequency control (AFC) arrangement for use in a symmetrically modulated, homodyne FSK receiver or transceiver forms a value representing the baseband frequency for each of demodulated data states "1" and "0" by measuring the frequency (54, 56; 80, 82) during the appropriate data state, stores it (58, 60; 84, 86) during the opposite data state, and subjects the two stored values to a subtraction process in a difference-forming means (64, 88), the output of which is then used to effect control of the frequency of the local oscillator (32). The AFC arrangement may be realized by analogue techniques, using one or more frequency-to-voltage converters and sample-and-hold units, or by digital techniques, using one or more counters and latches, or by software techniques.

REFERENCES:
patent: 4523324 (1985-06-01), Marshall
patent: 4647864 (1987-03-01), Rafferty et al.
patent: 5150382 (1992-09-01), Kume
patent: 5208835 (1993-05-01), Weeks et al.
patent: 5434889 (1995-07-01), Buier

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