QAM demodulator with rapid resynchronization function

Details QAM demodulator with rapid resynchronization function QAM demodulator with rapid resynchronization function

1988-07-21

1989-05-30

Mis, David

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 329124, 329135, 375 80, 375101, H03D 318

Patent

active

048354830

ABSTRACT:
In order to rapidly resynchronize a QAM demodulator by effectively operating a transversal equalizer, when the demodulator remains in synchronism, a transversal filter forming part of the equalizer is allowed to operate normally. On the other hand, in the event that the demodulator falls into asynchronism, (a) the transversal filter intermittently operates and receives a first constant voltage during the discontinuous operations if a deviated message point is detected within a predetermined region and (b) the transversal filter is alternately supplied with the first constant voltage and a second constant voltage if a deviated message point is outside the predetermined of the region.

REFERENCES:
patent: 4567599 (1986-01-01), Mizoguchi
patent: 4703282 (1987-10-01), Yoshida

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