Data transmission method and apparatus
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United States of America Patent
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Nov 5, 2002
Issued Date -
N/A
app pub date -
Jun 8, 1999
filing date -
Jun 8, 1999
priority date (Note) -
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Abstract
A method and apparatus for modulating a plurality of information signals onto respective unique intermediate frequency (IF) carrier signals, summing the respective IF carrier signals to provide a stacked IF carrier signal and upconverting the stacked IF carrier signal to a radio frequency (RF). Advantageously, the invention reduces the cost and complexity of modulation and frequency conversion processes in those systems requiring a multiplicity of audio, video or data carriers placed side by side or in a consecutive order within a defined frequency spectrum.
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