GB1506841A - Wired broadcasting systems - Google Patents

Wired broadcasting systems

Info

Publication number
GB1506841A
GB1506841A GB1014674A GB1014674A GB1506841A GB 1506841 A GB1506841 A GB 1506841A GB 1014674 A GB1014674 A GB 1014674A GB 1014674 A GB1014674 A GB 1014674A GB 1506841 A GB1506841 A GB 1506841A
Authority
GB
United Kingdom
Prior art keywords
subscribers
programme
selection
cable
converter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1014674A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Communications Patents Ltd
Original Assignee
Communications Patents Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Communications Patents Ltd filed Critical Communications Patents Ltd
Priority to GB3642477A priority Critical patent/GB1506842A/en
Priority to GB1014674A priority patent/GB1506841A/en
Publication of GB1506841A publication Critical patent/GB1506841A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/10—Arrangements for replacing or switching information during the broadcast or the distribution
    • H04H20/103—Transmitter-side switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/38—Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

1506841 Wired broadcasting COMMUNICATIONS PATENTS Ltd 10 March 1975 [6 March 1974] 10146/74 Heading H4R In a wired braodcasting system a trunk cable (I) Fig. 1 (not shown) has a plurality of pairs of wires on which programme signals are made available. Stem cables (3) are connected to the trunk cable, preferably by repeaters (2), and also have a plurality of pairs of wires carrying respective programme signals. A number of exchanges (4) are arranged on each stem cable, each feeding a number of subscribers via respective subscriber cables (5), the exchanges having switching to interconnect a subscribers cable to a selected pair of wires in the stem cable in accordance with the setting of a selector in the subscribers unit. As described the subscribers selector is a variable resistance device connected across the subscribers line and adjustable in steps to select the required programme. At the exchange, Fig. 2, which is the subject of divisional application no. 36424/77, a voltage source 13 is connected in series with resistor 12 across each subscribers line 20, via rf chokes 21. The potential across the respective resistors 12, corresponding to each subscribers line, depends on the respective subscribers selection and these voltages are sampled successively by multiplexer 8 under the control of clock 6 and binary converter 7, and the samples are fed to an a to d converter 9 to provide binary codes corresponding to the programme selected. Each binary code, in a converter 10, enables one of the twelve output lines of drive unit 11, corresponding to the subscribers selection. Each subscriber has a set of twelve gates 14 which are enabled, by 15, at the same time as the subscribers selection appears at the output of drive unit 11 so that the appropriate one of the gates 14 is opened to cause closing of one of the switches 16 to connect the one of lines 17, carrying the selected programme to the subscribers line. The time constant of the gate 14, and/or the switch 16 is such as to hold between successive appearances of the enabling signal on unit 15. It is suggested that the selection signal may be an A.C. or HF signal with selection indicated by frequency changes, or frequency, amplitude, or phase, modulation, or pulse position, pulse frequency, or pulse amplitude, modulation.
GB1014674A 1975-03-10 1975-03-10 Wired broadcasting systems Expired GB1506841A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3642477A GB1506842A (en) 1975-03-10 1975-03-10 Wired broadcasting system switching apparatus
GB1014674A GB1506841A (en) 1975-03-10 1975-03-10 Wired broadcasting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1014674A GB1506841A (en) 1975-03-10 1975-03-10 Wired broadcasting systems

Publications (1)

Publication Number Publication Date
GB1506841A true GB1506841A (en) 1978-04-12

Family

ID=9962359

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1014674A Expired GB1506841A (en) 1975-03-10 1975-03-10 Wired broadcasting systems

Country Status (1)

Country Link
GB (1) GB1506841A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121656A (en) * 1982-05-14 1983-12-21 Communications Patents Ltd Communications system
GB2164229A (en) * 1982-05-14 1986-03-12 Communications Patents Ltd Communications system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121656A (en) * 1982-05-14 1983-12-21 Communications Patents Ltd Communications system
GB2164229A (en) * 1982-05-14 1986-03-12 Communications Patents Ltd Communications system

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee