| 摘要 |
A method and apparatus for modulating a plurality of information signals (51) onto respective unique intermediate frequency (IF) carrier signals (52), summing the respective IF carrier signals (52) to provide a stacked IF carrier signal (54) and upconverting the stacked IF carrier signal to a radio frequency (RF) (510). 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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