Data modulation arrangement for selectively distributing data

Details Data modulation arrangement for selectively distributing data Data modulation arrangement for selectively distributing data

1993-12-30

1995-04-18

Groody, James J.

Television

Special applications

Manufacturing

348 12, 455 31, H04N 716

Patent

active

054082595

ABSTRACT:
A cable television distribution arrangement is supplied via optical fibers with additional digital signals which are delivered to customers via coaxial drop cables modulated at frequencies above those of the conventional analog television channels. A reduction in the required number of modulators is achieved, while delivering individually selected signals to individual customers, by supplying digital signals for a group of customers to a first modulator and a pseudo dam signal to a second modulator, and selecting between the outputs of the two modulators individually for each customer in the group. Switching between the outputs of the modulators is carried out during overhead information which is additionally supplied commonly to both modulators.

REFERENCES:
patent: 4994909 (1991-02-01), Graves et al.
patent: 5073899 (1991-12-01), Collier et al.

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