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GB1480749A - Wired broadcasting systems - Google Patents

Wired broadcasting systems

Info

Publication number
GB1480749A
GB1480749A GB11791/74A GB1179174A GB1480749A GB 1480749 A GB1480749 A GB 1480749A GB 11791/74 A GB11791/74 A GB 11791/74A GB 1179174 A GB1179174 A GB 1179174A GB 1480749 A GB1480749 A GB 1480749A
Authority
GB
United Kingdom
Prior art keywords
frequency
exchange
subscriber
subscribers
programme
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
GB11791/74A
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 GB11791/74A priority Critical patent/GB1480749A/en
Priority to CH311175A priority patent/CH589981A5/xx
Priority to DE2510865A priority patent/DE2510865C3/en
Priority to SE7502806A priority patent/SE407002B/en
Priority to IL46827A priority patent/IL46827A/en
Priority to CA221,995A priority patent/CA1052446A/en
Priority to NLAANVRAGE7503107,A priority patent/NL183694B/en
Priority to ZA00751615A priority patent/ZA751615B/en
Priority to FR7508819A priority patent/FR2264447B1/fr
Priority to IT48621/75A priority patent/IT1032322B/en
Priority to ES435664A priority patent/ES435664A1/en
Priority to BE154398A priority patent/BE826763A/en
Priority to JP50031230A priority patent/JPS50133701A/ja
Priority to US05/711,463 priority patent/US4064460A/en
Publication of GB1480749A publication Critical patent/GB1480749A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/173—Analogue secrecy systems; Analogue subscription systems with two-way working, e.g. subscriber sending a programme selection signal
    • H04N7/17345—Control of the passage of the selected programme
    • H04N7/17354—Control of the passage of the selected programme in an intermediate station common to a plurality of user terminals

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Details Of Television Systems (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

1480749 Wired broadcasting systems COMMUNICATIONS PATENTS Ltd 7 March 1975 [16 March 1974] 11791/74 Heading H4R In a wired broadcasting system a wide band coaxial cable 3 carries multichannel programme signals from a programme source 1 to a number of programme exchanges 4 to each of which a number of subscriber units 7 are connected. The channels in the wide band cable 3 are stacked one upon another in frequency, and each exchange has, for each subscriber a respective frequency translator 10 which is controlled from the respective subscriber unit 7 to convert a selected one of the stacked frequency signals to a predetermined other frequency which the subscriber is able to receive. As described the central station 1 transmits the programme signals on low deviation fm carriers, although standard UHF or VHF modulation can be used, and the cable 3 has a bandwidth of 600 MHz. Also applied to the cable are one or more pilot tones from generator 5. Each exchange can be connected to its subscribers by respective "Qwist" cables 8 of the type described in Specification 1,272,594 fed from the frequency translators 10 with a unit 11 to bypass the pilot signal around the translators 10 and apply it direct to the line. At the subscribers unit the pilot signal is utilized via frequency dividers or multipliers to generate selectively control signals which, fed back to the exchange, determine the parameters of the frequency translation so that the selected programme is returned to the subscriber over the respective one of lines 8 at the frequency which the subscriber can receive. In order to restrict reception of particular programmes the control unit 11 at the exchange may restrict the pilot tones applied to the subscribers line so that not all the programmes available can be selected by the subscriber to prevent subscribers receiving pay programmes &c. If desired the control unit 11 may be under the control of a central pay tv computer. In an alternative embodiment, Fig. 2 (not shown) the exchange 4 is linked to the subscribers units 7 via a single wide band cable (15) and individual subsidiary cables (16) and the various subscribers are allotted respective transmission frequencies, those near the exchange having frequencies higher than those more distant to increase the service area of the exchange. The subscriber will be provided with a frequency translator to change the frequency of the programme received from his line to that appropriate his receiver, the frequency translator utilizing the pilot tones received from the exchange and being located on or outside the subscribers premises.
GB11791/74A 1974-03-16 1974-03-16 Wired broadcasting systems Expired GB1480749A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
GB11791/74A GB1480749A (en) 1974-03-16 1974-03-16 Wired broadcasting systems
CH311175A CH589981A5 (en) 1974-03-16 1975-03-12
DE2510865A DE2510865C3 (en) 1974-03-16 1975-03-13 Wire radio system with at least one exchange connected to several program sources
SE7502806A SE407002B (en) 1974-03-16 1975-03-13 TRADRADIO SYSTEM DEVICE
IL46827A IL46827A (en) 1974-03-16 1975-03-13 Wired broadcasting systems
CA221,995A CA1052446A (en) 1974-03-16 1975-03-13 Wired broadcasting system with a wideband coaxial cable for multi-channel signals
NLAANVRAGE7503107,A NL183694B (en) 1974-03-16 1975-03-14 NETWORK CABLE BROADCAST SYSTEM FOR TRANSPORTING PROGRAM SIGNALS TO A NUMBER OF CONTROL PANELS.
ZA00751615A ZA751615B (en) 1974-03-16 1975-03-14 Improvements in or re6%ting to wired broadcasting systems
FR7508819A FR2264447B1 (en) 1974-03-16 1975-03-14
IT48621/75A IT1032322B (en) 1974-03-16 1975-03-14 IMPROVEMENTS RELATING TO CABLE BROADCASTING SYSTEMS
ES435664A ES435664A1 (en) 1974-03-16 1975-03-15 Wired broadcasting systems
BE154398A BE826763A (en) 1974-03-16 1975-03-17 IMPROVEMENTS TO AND RELATED TO CABLE BROADCASTING
JP50031230A JPS50133701A (en) 1974-03-16 1975-03-17
US05/711,463 US4064460A (en) 1974-03-16 1976-08-04 Coaxial wired broadcasting system with tone responsive program selectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11791/74A GB1480749A (en) 1974-03-16 1974-03-16 Wired broadcasting systems

Publications (1)

Publication Number Publication Date
GB1480749A true GB1480749A (en) 1977-07-20

Family

ID=9992776

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11791/74A Expired GB1480749A (en) 1974-03-16 1974-03-16 Wired broadcasting systems

Country Status (13)

Country Link
JP (1) JPS50133701A (en)
BE (1) BE826763A (en)
CA (1) CA1052446A (en)
CH (1) CH589981A5 (en)
DE (1) DE2510865C3 (en)
ES (1) ES435664A1 (en)
FR (1) FR2264447B1 (en)
GB (1) GB1480749A (en)
IL (1) IL46827A (en)
IT (1) IT1032322B (en)
NL (1) NL183694B (en)
SE (1) SE407002B (en)
ZA (1) ZA751615B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127257A (en) * 1982-08-17 1984-04-04 Visionhire Cable Limited Distribution apparatus
WO2001050775A3 (en) * 1999-12-29 2002-05-02 Elisa Comm Oyj Method for increasing data transfer capacity of a data communications network, such as a cable television network

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4135157A (en) * 1977-03-28 1979-01-16 Oak Industries Inc. Pole mounted converter
DE2807986A1 (en) * 1978-02-22 1979-08-30 Hertz Inst Heinrich SYSTEM FOR INTERACTIVE CABLE TV
CA1142244A (en) * 1979-08-22 1983-03-01 Eric J. Gargini Wired broadcasting system with subscriber controlled switched programme selection
DE2951512A1 (en) 1979-12-20 1981-07-02 Siemens AG, 1000 Berlin und 8000 München BROADBAND SWITCHING SYSTEM
FR2515400A1 (en) * 1981-10-26 1983-04-29 Visiodis Sa FDM system for remote control of surveillance cameras - uses frequency converters at remotely controlled concentrator for transposed base band signals
DE3301208A1 (en) * 1983-01-15 1984-07-26 ANT Nachrichtentechnik GmbH, 7150 Backnang Broadband switching network

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073906A (en) * 1959-06-16 1963-01-15 Bell Telephone Labor Inc Line concentrating telephone system
BE632218A (en) * 1963-05-31
GB1272594A (en) * 1968-08-09 1972-05-03 Communications Patents Ltd Improvements in and relating to wired broadcasting systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2127257A (en) * 1982-08-17 1984-04-04 Visionhire Cable Limited Distribution apparatus
WO2001050775A3 (en) * 1999-12-29 2002-05-02 Elisa Comm Oyj Method for increasing data transfer capacity of a data communications network, such as a cable television network

Also Published As

Publication number Publication date
FR2264447B1 (en) 1981-07-24
DE2510865A1 (en) 1975-09-18
CA1052446A (en) 1979-04-10
NL183694B (en) 1988-07-18
BE826763A (en) 1975-07-16
IL46827A (en) 1977-07-31
DE2510865B2 (en) 1978-12-14
SE407002B (en) 1979-03-05
IT1032322B (en) 1979-05-30
ZA751615B (en) 1976-02-25
NL7503107A (en) 1975-09-18
JPS50133701A (en) 1975-10-23
SE7502806L (en) 1975-09-17
ES435664A1 (en) 1976-12-01
DE2510865C3 (en) 1983-11-10
IL46827A0 (en) 1975-05-22
FR2264447A1 (en) 1975-10-10
CH589981A5 (en) 1977-07-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930307