Digital carrier combining apparatus in a multiple QAM digital television signal receiver
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United States of America Patent
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-
May 17, 1994
Grant Date -
N/A
app pub date -
Dec 16, 1992
filing date -
Sep 10, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a high definition television signal encoder, high priority and standard priority digital data are each separated into quadrature I and Q components, spectrally shaped by digital filtering, and time division multiplexed to produce respective quadrature amplitude modulated signals of the 32-QAM type. The high priority QAM signal and the standard priority QAM signal exhibit different bandwidths and carrier frequencies. The high priority and standard priority QAM signals are combined in digital form to produce a prioritized dual 32-QAM digital signal before being conveyed to a single analog-to-digital converter and analog RF transmission networks.
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Cited Art Landscape
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