Demodulator control system and a receiver capable of quickly acq

Details Demodulator control system and a receiver capable of quickly acq Demodulator control system and a receiver capable of quickly acq

1995-12-27

1998-01-13

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Angle modulation

375340, 375365, 370514, H04L 700, H04L 2706

Patent

active

057086826

ABSTRACT:
In a control system being provided with a local oscillator (42) and being for controlling a demodulating arrangement (43, 44, and 45) demodulating a desired one of modulated signals in accordance with a demodulating frequency, produced by a sweeping operation of the local oscillator, into a demodulated signal having a unique word and an identification number which are carried by the desired modulated signal, a unique word detecting circuit (47) detects the unique word to produce a unique word detection signal. A number comparing circuit (48) compares the identification number with a desired one of predetermined numbers to produce a number coincidence signal when the identification number coincides with the desired number. In response to presence and absence of each of the number coincidence and the unique word detection signals, an oscillator control circuit (49) controls the sweeping operation of the local oscillator.

REFERENCES:
patent: 5007088 (1991-04-01), Ooi et al.
patent: 5012491 (1991-04-01), Iwasaki
patent: 5020131 (1991-05-01), Isoe
patent: 5303234 (1994-04-01), Kou
Nawata, et al., A Study for Demodulator Acquisition Scheme for a Small Capacity Transmission, Systems, Electronics, Information and Communication Engineers in Japan, Sat88-45, 1988.

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