High channel density community antenna arrangement having low in

Details High channel density community antenna arrangement having low in High channel density community antenna arrangement having low in

1982-12-10

1985-07-30

George, Keith E.

Facsimile and static presentation processing

Static presentation processing

Attribute control

455 3, H04N 710, H04H 106

Patent

active

045325430

ABSTRACT:
A frequency-conversion arrangement (C.sub.1 -C.sub.j, l.sub.1 -l.sub.k) is connected to a distribution network (II, III) for converting the channel frequency distribution of television signals from an input channel pattern, to an output channel pattern in which output channel pattern the picture carriers of the television signals succeed each other with frequency spacings of which not more than two consecutive frequency spacings are mutually equal. By choosing the picture carrier distances in the second output channel pattern to be equal to an integer multiple of a certain frequency interval, the higher order intermodulation products appear at frequencies which are mutually spaced over fixed distances of the order of this frequency interval which distances equal an integer multiple of the frequency interval relative to the picture carriers. According to the invention, this frequency interval must be chosen so that the intermodulation products predominantly occur in interference-insensitive positions in the TV-signals spectrum, as a result of which the effect of interferences due to intermodulation is significantly reduced.

REFERENCES:
patent: 3665316 (1972-05-01), Jeffers
patent: 3742131 (1973-06-01), Rogeness
patent: 3835244 (1974-09-01), Smart
patent: 4302771 (1981-11-01), Gargini
International Telecommunication Union, "Recommendations and Reports of the CCIR, 1978", XIVth Plenary Assembly, Kyoto, 1978, vol. XI, Broadcasting Service (Television) Sec: 11A; Characteristics of Systems for Monochrome and Colour Television, Rec. 470-1, Rep. 624-1, Rec. 418-3 and Rep. 306-3.

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