Local oscillating device

Details Local oscillating device Local oscillating device

1991-05-29

1993-12-14

Kuntl, Curtis

Pulse or digital communications

Repeaters

Testing

375 84, 375120, 329307, 455208, H03D 324

Patent

active

052710394

ABSTRACT:
There is disclosed a local oscillating device useful for a communication system where frequency conversion is implemented to data signals received in a burst manner, particularly for INMARSAT STC-C (International Maritime Satellite Organization Standard - C) system. This local oscillating device comprises a local oscillating circuit including a quartz-crystal oscillator of which oscillating frequency can be controlled, an A/D converter for converting a received phase modulated signal to a received digital signal by using a sampling clock from the local oscillating circuit, and a demodulation circuit for reproducing a symbol clock serving as reference of demodulation from the received digital signal from the A/D converter to demodulate the received digital signal by using the symbol clock, and to detect information indicative of a phase difference between the symbol clock and the sampling clock, thus to control an oscillating frequency of the quartz-crystal oscillator on the basis of the phase difference information to output a local oscillating signal of a predetermined frequency.

REFERENCES:
patent: 4320345 (1982-03-01), Waggener
patent: 4475216 (1984-10-01), Noguchi
patent: 4789948 (1988-12-01), Von der Embse
patent: 4896336 (1990-01-01), Henely et al.
patent: 5128626 (1992-07-01), Iwasaki

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