GB1522033A - Wired television broadcasting systems - Google Patents

Wired television broadcasting systems

Info

Publication number
GB1522033A
GB1522033A GB44500/75A GB4450075A GB1522033A GB 1522033 A GB1522033 A GB 1522033A GB 44500/75 A GB44500/75 A GB 44500/75A GB 4450075 A GB4450075 A GB 4450075A GB 1522033 A GB1522033 A GB 1522033A
Authority
GB
United Kingdom
Prior art keywords
phase
channels
outputs
oct
selectors
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
GB44500/75A
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 GB44500/75A priority Critical patent/GB1522033A/en
Priority to ZA766305A priority patent/ZA766305B/en
Priority to NL7611861A priority patent/NL7611861A/en
Priority to DE2648743A priority patent/DE2648743C2/en
Priority to IL50784A priority patent/IL50784A/en
Priority to FR7633041A priority patent/FR2330235A1/en
Priority to BE2055404A priority patent/BE847710A/en
Priority to AU19110/76A priority patent/AU503328B2/en
Priority to CA264,350A priority patent/CA1099392A/en
Priority to CH1357976A priority patent/CH595031A5/xx
Priority to SE7611982A priority patent/SE415623B/en
Priority to IT51967/76A priority patent/IT1121711B/en
Priority to JP12955376A priority patent/JPS5284914A/en
Priority to ES452873A priority patent/ES452873A1/en
Priority to US05/909,845 priority patent/US4200839A/en
Publication of GB1522033A publication Critical patent/GB1522033A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H04N7/108—Adaptations for transmission by electrical cable the cable being constituted by a pair of wires
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/10—Adaptations for transmission by electrical cable
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/18—Networks for phase shifting
    • H03H7/21—Networks for phase shifting providing two or more phase shifted output signals, e.g. n-phase output

Abstract

1522033 Wired broadcasting COMMUNICATIONS PATENTS Ltd 27 Oct 1976 [29 Oct 1975] 44500/75 Heading H4R In a wired television broadcasting system in which a number of programme signals are available on separate conductive paths to each of a plurality of programme selectors controllable by respective subscribers to the system, the selectors being either remote controlled or on the subscribers premises, the conductive paths are divided into groups, each group having a number of pairs of channels, with the channels of each pair having carrier frequencies which are offset by an integral multiple of half the line scan frequency and the phases of the carriers of the channels in the different pairs differing by an odd integral multiple of 90‹. As described carrier sources 11 and 12 provide carriers of about 8À9 MHz which differ by half the line scan frequency, each carrier source feeds a phase splitting transformer 13, or 16, Fig. 2 (not shown) to provide two outputs, 180 degrees out of phase, which feed respective phase shifters 14, 15, 17, 18, Fig. 3 (not shown) which each produce two outputs which are relatively shifted in phase by Œ45 degrees relative their input. The outputs of the phase shifters 14-18 feed respective modulators 27 to be modulated by respective programmes 28, and fed to the distribution network 29.
GB44500/75A 1975-10-29 1975-10-29 Wired television broadcasting systems Expired GB1522033A (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
GB44500/75A GB1522033A (en) 1975-10-29 1975-10-29 Wired television broadcasting systems
ZA766305A ZA766305B (en) 1975-10-29 1976-10-22 Improvements in or relating to wired television broadcasting systems
NL7611861A NL7611861A (en) 1975-10-29 1976-10-26 TELEVISION BROADCASTING SYSTEM.
DE2648743A DE2648743C2 (en) 1975-10-29 1976-10-27 Cable television system
IL50784A IL50784A (en) 1975-10-29 1976-10-27 Wired television broadcasting systems
FR7633041A FR2330235A1 (en) 1975-10-29 1976-10-27 IMPROVEMENTS TO AND RELATED TO CABLE TELEVISION BROADCASTING DEVICES
BE2055404A BE847710A (en) 1975-10-29 1976-10-28 IMPROVEMENTS TO AND RELATED TO CABLE TELEVISION BROADCASTING DEVICES,
AU19110/76A AU503328B2 (en) 1975-10-29 1976-10-28 Wired television broadcasting systems
CA264,350A CA1099392A (en) 1975-10-29 1976-10-28 Wired television broadcasting systems
CH1357976A CH595031A5 (en) 1975-10-29 1976-10-28
SE7611982A SE415623B (en) 1975-10-29 1976-10-28 CABLE TELEVISION SYSTEM DEVICE
IT51967/76A IT1121711B (en) 1975-10-29 1976-10-29 REFERENCES RELATED TO CABLE TELEVISION BROADCASTING SYSTEMS
JP12955376A JPS5284914A (en) 1975-10-29 1976-10-29 Wire television broadcasting system
ES452873A ES452873A1 (en) 1975-10-29 1976-10-29 Wired television broadcasting systems
US05/909,845 US4200839A (en) 1975-10-29 1978-05-26 Wired television broadcasting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB44500/75A GB1522033A (en) 1975-10-29 1975-10-29 Wired television broadcasting systems

Publications (1)

Publication Number Publication Date
GB1522033A true GB1522033A (en) 1978-08-23

Family

ID=10433602

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44500/75A Expired GB1522033A (en) 1975-10-29 1975-10-29 Wired television broadcasting systems

Country Status (14)

Country Link
JP (1) JPS5284914A (en)
AU (1) AU503328B2 (en)
BE (1) BE847710A (en)
CA (1) CA1099392A (en)
CH (1) CH595031A5 (en)
DE (1) DE2648743C2 (en)
ES (1) ES452873A1 (en)
FR (1) FR2330235A1 (en)
GB (1) GB1522033A (en)
IL (1) IL50784A (en)
IT (1) IT1121711B (en)
NL (1) NL7611861A (en)
SE (1) SE415623B (en)
ZA (1) ZA766305B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2429140A (en) * 2005-08-12 2007-02-14 Technetix Group Ltd Signal splitter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2658030B2 (en) * 1987-01-30 1997-09-30 ソニー株式会社 Information transmission equipment
US4887152A (en) * 1987-01-30 1989-12-12 Sony Corporation Message delivery system operable in an override mode upon reception of a command signal

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2095341A (en) * 1934-06-02 1937-10-12 American Telephone & Telegraph Electrooptical transmission system
GB780324A (en) * 1954-05-18 1957-07-31 Emi Ltd Improvements relating to wired electrical signal distributing systems
GB1043232A (en) * 1962-05-25 1966-09-21 Communications Patents Ltd Improved wired broadcasting systems and apparatus therefor
GB1052251A (en) * 1962-10-22 1966-12-21
GB1252942A (en) * 1968-03-13 1971-11-10
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
GB2429140A (en) * 2005-08-12 2007-02-14 Technetix Group Ltd Signal splitter
GB2429140B (en) * 2005-08-12 2008-04-23 Technetix Group Ltd Signal splitter

Also Published As

Publication number Publication date
BE847710A (en) 1977-02-14
JPS5284914A (en) 1977-07-14
IL50784A (en) 1978-08-31
ES452873A1 (en) 1977-11-01
FR2330235B1 (en) 1983-11-18
FR2330235A1 (en) 1977-05-27
DE2648743A1 (en) 1977-05-05
NL7611861A (en) 1977-05-03
CH595031A5 (en) 1978-01-31
IL50784A0 (en) 1976-12-31
DE2648743C2 (en) 1983-01-20
SE7611982L (en) 1977-04-30
ZA766305B (en) 1977-09-28
CA1099392A (en) 1981-04-14
SE415623B (en) 1980-10-13
AU503328B2 (en) 1979-08-30
IT1121711B (en) 1986-04-23
AU1911076A (en) 1978-05-04

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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