Multiplex communications – Wide area network – Packet switching
Patent
1983-09-12
1987-01-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
358143, 375 38, H04J 100, H04N 704, H04K 110
Patent
active
046399119
ABSTRACT:
Head-end and receiver for a signal distribution system for signals having a wide frequency band and for accompanying signals having a narrow frequency band, such as the video signal and the sound signal of a television signal, respectively, digital signals being used for the distribution. The head-end comprises a first (4) and a second (5) A/D-converter for the signal having the wide frequency band and the signal having the narrow frequency band, respectively. The receiver comprises corresponding D/A-converters (13, 14). In order to avoid a specific frame structure and corresponding frame synchronization, the digital output signal of the second A/D-converter is modulated in a modulator (7) in the head-end on a subcarrier from a source (6) and thereafter added to the signal having the wide frequency band, and the combined signal is applied to the first A/D-converter (4) which is provided by a one-bit modulator. In the receiver the received digital signal is applied to a demodulator (17) via a bandpass filter (15), the demodulator output signal being applied to the second.
REFERENCES:
patent: 3939303 (1976-02-01), Wise
patent: 4218697 (1980-08-01), Leventer
patent: 4227204 (1980-10-01), Rossi
patent: 4232293 (1980-11-01), Harris
patent: 4449218 (1984-05-01), Strehl
patent: 4470070 (1984-09-01), Griffis
patent: 4496979 (1985-01-01), Yu et al.
Roza Engel
Van Veenendaal Hendrik G.
Briody Thomas A.
Eason Leroy
Olms Douglas W.
Scutch III Frank M.
Streeter William J.
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