H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/04 (2006.01) H03C 1/60 (2006.01) H03C 1/62 (2006.01)
Patent
CA 2066735
2066735 9103899 PCTABS00003 A communications method and apparatus for zero sideband amplitude modulation is described. Plural digital representations of sinewaves having different amplitudes but same periods are contained in a read-only memory. Selection between the digital representation of sinewaves having different amplitudes is based upon a digital modulation signal. Switching between the digital representations of sinewaves within the read-only memory is performed only at the zero crossing of the sinewave. The digital representations of the sinewaves are output to a digital to analog convertor to produce an RF amplitude modulated carrier signal with no sidebands. Since the switching of amplitude occurs at the zero crossing of the carrier, no upper sideband or lower sideband information results. The carrier frequency without sidebands is extremely narrow allowing multiple carriers containing high quality information to be closely spaced within the available communications spectrum. A many fold increase in the available use of the communications bandwidth is achieved.
Anderson Terry M.
Goudreau Gage Dubuc
Zsb Inc.
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