Demodulating apparatus having quick pull-in synchronization faci

Details Demodulating apparatus having quick pull-in synchronization faci Demodulating apparatus having quick pull-in synchronization faci

1994-01-27

1995-08-08

Pascal, Robert J.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Input signal combined with local oscillator or carrier...

331 4, 375327, 329309, H03D 300

Patent

active

054402662

ABSTRACT:
A demodulating apparatus, which includes an up/down counter which counts up and down in accordance with a phase detection signal from a phase detector, an addition/subtraction unit which adds and subtracts the value (.DELTA.F1, .DELTA.F2) of the synchronization pull-in range to the count output, a counter stoppage unit which monitors a recovered carrier synchronization detection signal INIT and freezes the count output of the up/down counter immediately when detecting a disconnection of the input signal, and a synchronization pull-in range setting unit which expands the synchronization pull-in range at the same time as this to make it .DELTA.F2. The time required until establishment of synchronization with the input signal next to be received after the disconnection of an input signal is shortened.

REFERENCES:
patent: 4525676 (1985-06-01), Atobe et al.
patent: 4542347 (1985-09-01), Verfaillie et al.
patent: 4764730 (1988-08-01), Miyo et al.

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