US 4,382,266 A · Broad band switching system

Abstract

A broad band switching system for television signals and, under certain conditions, for radio signals, provides that the signals which are phase modulated with the TV programs are switchable by way of a broad band switching network and can then be transmitted in frequency division multiplex to the subscribers by way of light wave guides. In such a system, each television program source is supplied in a plurality of frequency channels to a corresponding plurality of frequency channel-specific switching levels for the purpose of television program switching, so that each subscriber has simultaneous access in the plurality of frequency channels to a corresponding plurality of programs. Additional television program sources, as well as audio program sources, can be constantly connected to the subscribers by way of additional frequency channels.

Claims10

Dependent claims

A broad band switching system for the selective connection of broad band signals to a plurality of subscribers, comprising:

a plurality of broad band signal sources, each operable to produce respective angle-modulated signals;
a plurality of fanning circuits, each connected to a respective source and including a plurality of outputs and operable to provide the modulated signals at respective outputs on respective frequency channels;
a broad band switching network including a plurality of switching planes each assigned a frequency position and each including inputs connected to those outputs of said fanning circuits assigned to the same frequency position, and a plurality of outputs each assigned to a respective subscriber;
and
a plurality of light transmission circuits each connected to all of the outputs of said switching network assigned to a respective subscriber.

2 more elements

Dependencies are inferred from the claim text.

Broad band switching system

Life of this patent

Broad band switching system

Life of this patent

Abstract

Claims10