Dual mode automatic frequency control

Details Dual mode automatic frequency control Dual mode automatic frequency control

1990-07-30

1992-11-10

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at same station

Convertible

455142, 455214, 375 5, H04B 140, H04B 116

Patent

active

051631598

ABSTRACT:
A frequency control system for a dual-mode radiotelephone (152-238; 252-320) operative to receive either an FM signal or a DQPSK signal. In a first embodiment, when operative to receive the FM signal, the frequency of the reference oscillator (192) of the radiotelephone (152-222) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (192) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (212). In a second embodiment, when operative to receive the FM signal, the frequency of an offset control oscillator (320) is maintained in a fixed relation with the frequency of the FM signal. When operative to receive the DQPSK signal, the reference oscillator (292) is maintained in a fixed relation with the frequency of the DQPSK signal as determined by a digital signal processor (312).

REFERENCES:
patent: 4355401 (1982-10-01), Ikoma et al.
patent: 4677690 (1987-06-01), Reed
patent: 4704734 (1987-11-01), Menich et al.
patent: 4852086 (1989-07-01), Eastmond et al.
patent: 4893094 (1990-01-01), Herold et al.

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