Pulse or digital communications – Apparatus convertible to analog
Patent
1994-03-07
1996-12-24
Bocure, Tesfaldet
Pulse or digital communications
Apparatus convertible to analog
375260, 375261, 375279, 375298, 375308, 375329, 375340, H04L 2700, H04L 2728, H04L 2718, H04L 2302
Patent
active
055880223
ABSTRACT:
A broadcasting method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by: broadcasting an amplitude modulated radio frequency signal having a first frequency spectrum, wherein the amplitude modulated radio frequency signal includes a first carrier modulated by an analog program signal; and simultaneously broadcasting a plurality of digitally modulated carrier signals within a bandwidth which encompasses the first frequency spectrum, each of the digitally modulated carrier signals being modulated by a portion of a digital program signal, wherein a first group of the digitally modulated carrier signals lying within the first frequency spectrum are modulated in-quadrature with the first carrier signal, and wherein second and third groups of the digitally modulated carrier signals lie outside of the first frequency spectrum and are modulated both in-phase and in-quadrature with the first carrier signal. Transmitters and receivers which operate in accordance with the above method are also provided.
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Carlin Barry W.
Dapper Mark J.
Geile Michael J.
Bocure Tesfaldet
Edwards C. O.
Xetron Corp.
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