GB1522033A – Wired television broadcasting systems
– Google Patents
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
1975-10-29
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.)
1975-10-29
Filing date
1975-10-29
Publication date
1978-08-23
1975-10-29
Application filed by Communications Patents Ltd
filed
Critical
Communications Patents Ltd
1975-10-29
Priority to GB44500/75A
priority
Critical
patent/GB1522033A/en
1976-10-22
Priority to ZA766305A
priority
patent/ZA766305B/en
1976-10-26
Priority to NL7611861A
priority
patent/NL7611861A/en
1976-10-27
Priority to IL50784A
priority
patent/IL50784A/en
1976-10-27
Priority to FR7633041A
priority
patent/FR2330235A1/en
1976-10-27
Priority to DE2648743A
priority
patent/DE2648743C2/en
1976-10-28
Priority to SE7611982A
priority
patent/SE415623B/en
1976-10-28
Priority to CH1357976A
priority
patent/CH595031A5/xx
1976-10-28
Priority to BE2055404A
priority
patent/BE847710A/en
1976-10-28
Priority to CA264,350A
priority
patent/CA1099392A/en
1976-10-28
Priority to AU19110/76A
priority
patent/AU503328B2/en
1976-10-29
Priority to JP12955376A
priority
patent/JPS5284914A/en
1976-10-29
Priority to IT51967/76A
priority
patent/IT1121711B/en
1976-10-29
Priority to ES452873A
priority
patent/ES452873A1/en
1978-05-26
Priority to US05/909,845
priority
patent/US4200839A/en
1978-08-23
Publication of GB1522033A
publication
Critical
patent/GB1522033A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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 45 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.
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
DE2648743A
DE2648743C2
(en)
1975-10-29
1976-10-27
Cable television system
SE7611982A
SE415623B
(en)
1975-10-29
1976-10-28
CABLE TELEVISION SYSTEM DEVICE
CH1357976A
CH595031A5
(en)
1975-10-29
1976-10-28
BE2055404A
BE847710A
(en)
1975-10-29
1976-10-28
IMPROVEMENTS TO AND RELATED TO CABLE TELEVISION BROADCASTING DEVICES,
CA264,350A
CA1099392A
(en)
1975-10-29
1976-10-28
Wired television broadcasting systems
AU19110/76A
AU503328B2
(en)
1975-10-29
1976-10-28
Wired television broadcasting systems
JP12955376A
JPS5284914A
(en)
1975-10-29
1976-10-29
Wire television broadcasting system
IT51967/76A
IT1121711B
(en)
1975-10-29
1976-10-29
REFERENCES RELATED TO CABLE TELEVISION BROADCASTING SYSTEMS
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
US4887152A
(en)
*
1987-01-30
1989-12-12
Sony Corporation
Message delivery system operable in an override mode upon reception of a command signal
JP2658030B2
(en)
*
1987-01-30
1997-09-30
ソニー株式会社
Information transmission equipment
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
1975
1975-10-29
GB
GB44500/75A
patent/GB1522033A/en
not_active
Expired
1976
1976-10-22
ZA
ZA766305A
patent/ZA766305B/en
unknown
1976-10-26
NL
NL7611861A
patent/NL7611861A/en
not_active
Application Discontinuation
1976-10-27
DE
DE2648743A
patent/DE2648743C2/en
not_active
Expired
1976-10-27
FR
FR7633041A
patent/FR2330235A1/en
active
Granted
1976-10-27
IL
IL50784A
patent/IL50784A/en
unknown
1976-10-28
SE
SE7611982A
patent/SE415623B/en
unknown
1976-10-28
CH
CH1357976A
patent/CH595031A5/xx
not_active
IP Right Cessation
1976-10-28
AU
AU19110/76A
patent/AU503328B2/en
not_active
Expired
1976-10-28
BE
BE2055404A
patent/BE847710A/en
not_active
IP Right Cessation
1976-10-28
CA
CA264,350A
patent/CA1099392A/en
not_active
Expired
1976-10-29
JP
JP12955376A
patent/JPS5284914A/en
active
Pending
1976-10-29
IT
IT51967/76A
patent/IT1121711B/en
active
1976-10-29
ES
ES452873A
patent/ES452873A1/en
not_active
Expired
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
NL7611861A
(en)
1977-05-03
SE7611982L
(en)
1977-04-30
DE2648743C2
(en)
1983-01-20
BE847710A
(en)
1977-02-14
ES452873A1
(en)
1977-11-01
ZA766305B
(en)
1977-09-28
SE415623B
(en)
1980-10-13
AU503328B2
(en)
1979-08-30
IL50784A0
(en)
1976-12-31
FR2330235A1
(en)
1977-05-27
FR2330235B1
(en)
1983-11-18
CA1099392A
(en)
1981-04-14
DE2648743A1
(en)
1977-05-05
IT1121711B
(en)
1986-04-23
JPS5284914A
(en)
1977-07-14
CH595031A5
(en)
1978-01-31
IL50784A
(en)
1978-08-31
AU1911076A
(en)
1978-05-04
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Legal Events
Date
Code
Title
Description
1978-12-13
PS
Patent sealed [section 19, patents act 1949]
1987-06-10
PCNP
Patent ceased through non-payment of renewal fee
