Multiplex communications – Wide area network – Packet switching
Patent
1983-09-12
1987-03-31
Griffin, Robert L.
Multiplex communications
Wide area network
Packet switching
370 71, 370 73, 375 39, H04J 102, H04L 512
Patent
active
046548432
ABSTRACT:
A head-end for a signal distribution system with selection facility, includes a matrix (8) and a multiplexer (12) connected thereto for forming a multiplex signal. The head-end further comprises A/D converters (4-1 to .DELTA.-N) for converting the wide-band input signals into digital signals prior to supply to the matrix. The multiplexer comprises two amplitude modulators (13, 14) for the mutual quadrature amplitude modulation of a carrier (17) by two digital signals, and a summing means (18) for adding a digital signal in the base band to the modulated signal. A signal receiver for one of the modulated signals comprises a synchronous amplitude demodulator (21) connected to a synchronized carrier source (20) and also comprises means for digital-to-analog conversion (24).
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Roza Engel
Van Veenendaal Hendrik G.
Briody Thomas A.
Chin Wellington
Griffin Robert L.
Oisher Jack
Streeter William J.
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