QAM demodulator with rapid resynchronization function
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United States of America Patent
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May 30, 1989
Issued Date -
N/A
app pub date -
Jul 21, 1988
filing date -
Sep 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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