Television signal switching device for a cable distribution syst

Details Television signal switching device for a cable distribution syst Television signal switching device for a cable distribution syst

1994-01-12

1995-06-06

Groody, James J.

Television

Special applications

Manufacturing

348706, 455 42, H04N 716

Patent

active

054226686

ABSTRACT:
The invention relates to the selection of a source from a plurality of sources by means of shunt switches and series switches, which are respectively turned on and mined off, and vice versa. For access to, for example, four sources the device has two intermediate terminals B.sub.1, B.sub.2), one series switch (SE.sub.a, SE.sub.b) is arranged between the user installation and each of the two intermediate terminals, and each of the intermediate terminals is coupled to two sources (IN.sub.1, IN.sub.2 or IN.sub.3, IN.sub.4) by each time one series switch (SE.sub.1, SE.sub.2, SE.sub.3, SE.sub.4). Moreover, each source (IN.sub.1, IN.sub.2, IN.sub.3, IN.sub.4) is a.c. coupled to earth by a matching impedance in series with a shunt switch (Z.sub.1, SH.sub.1, or Z.sub.2, SH.sub.2, or Z.sub.3, SH.sub.3, or Z.sub.4, SH.sub.4). The device is used in CATV.

REFERENCES:
patent: 4039954 (1977-08-01), Den Toonder
patent: 4363033 (1982-12-01), Lovely
patent: 4525738 (1985-06-01), Imazeki et al.
patent: 4638181 (1987-01-01), Deiss
patent: 4802239 (1989-01-01), Ooto

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