H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/08 (2006.01) H04N 5/40 (2006.01) H04N 7/167 (2006.01)
Patent
CA 2527157
A method and apparatus for modulating both quadrature components of each of a plurality of RF signals comprising a multichannel signal compatible with standard television frequency plans is disclosed. By employing certain digital signal processing techniques, a pair of composite baseband signals are produced in manner that is uniquely associated with the modulation content of the RF signals. According to one aspect of the invention, by using the composite baseband signals to modulate in quadrature a single quadrature modulator, the composite baseband signals are shown to have a baseband frequency span that is substantially half of the frequency range spanned by the multichannel signal. An application for the CATV field in which a 6 MHz television channel spacing between the RF signals is also disclosed.
Broadband Innovations Inc.
Ridout & Maybee Llp
LandOfFree
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