专利名称：Wired broadcasting systems and
communication cables therefor
商品流通发明人：GABRIEL RALPH P.,KINROSS RUPERT I.申请号：US31760863
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申请日：19631021
pledge公开号：US3350647A
努力奋斗的英文公开日：
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模拟试题19671031
专利内容由知识产权出版社提供
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摘要：1,059,342. Distributing music &c. COMMUNICATIONS PATENTS Ltd. Oct. 18, 1963 [Oct. 25, 1962], No. 40403/62. Heading H4R. [Also in Division H1] In a wired broadcasting system for the distribution of audio-frequency signals in respect of sound programmes and high-frequency signals in respect of television signals, the distribution network compris a cable in which each of a plurality of pairs of twisted together insulated conductors rves for the transmission of highfrequency signals in respect of a plurality of different television programmes, the highfrequency pairs are arranged in a compact symmetrical group about a centre core element, and the conductors of each pair of a further plurality of pairs of conductors which rve for the transmission of the audio-frequency signals are arranged within the circumscribing cylinder of this group. The system compris a transmitting station 4, receiving stations 5 and a network comprising a multi-line cable 6. The transmitting station 4 includes A.F. amplifiers S1, S2, S3 for sound programmes and H.F. apparatus TV1 to TV6 for television programmes. Each receiving station 5 includes a combined television and sound receiver 9 and a lection switch 10. The cable 6 may compri six twisted pairs of conductors 11 to 16, each pair being connected to a different high-frequency apparatus and a centre core made up of three
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insurance是什么意思twisted pairs of conductors 17 to 19, each such pair being connected to a different amplifier S1 S2, S3. Each pair is twisted to a different pitch. Similar but smaller gauge cables 20 are ud as branch cables. Sound signals accompanying a television programme are transmitted over the same path as the corresponding high-frequency picture signals. Alternate ones of the highfrequency pairs of the network transmit carrier waves of the same frequency and adjacent highfrequency pairs transmit carrier waves of different frequency. Thus only two carrier frequencies are involved, with conquent simplification of transmission and receiving equipments. The carrier frequencies differ by an odd multiple of half the line frequency or an odd multiple of one-third the line frequency. In an alternative arrangement (Fig. 3, not shown), high-frequency pairs of the cable (preferably alternate H.F. pairs) have additional conductors constituting a twisted pair arranged in their interstices for transmission of A.F. signals. The centre core may then be a single twisted pair or a twisted group comprising three audio-frequency pairs or polythene string.
申请人：COMMUNICATIONS PATENTS LIMITED
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