GB1321749A - Videophone system - Google Patents

Videophone system

Info

Publication number
GB1321749A
GB1321749A GB5224971A GB5224971A GB1321749A GB 1321749 A GB1321749 A GB 1321749A GB 5224971 A GB5224971 A GB 5224971A GB 5224971 A GB5224971 A GB 5224971A GB 1321749 A GB1321749 A GB 1321749A
Authority
GB
United Kingdom
Prior art keywords
videophone system
nov
videophone
heading
concerned
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
GB5224971A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1321749A publication Critical patent/GB1321749A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/084—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only
    • H04N7/085—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the horizontal blanking interval only the inserted signal being digital
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
    • H04N7/54—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal the signals being synchronous
    • H04N7/56—Synchronising systems therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Synchronizing For Television (AREA)

Abstract

1321749 Television PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 10 Nov 1971 [13 Nov 1970] 52249/71 Heading H4F The subject-matter of this Specification is identical to that of Specification 1,321,750, but the claims are concerned with the arrangement at the videophone receiver for obtaining synchronization.
GB5224971A 1970-11-13 1971-11-10 Videophone system Expired GB1321749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7016628A NL7016628A (en) 1970-11-13 1970-11-13

Publications (1)

Publication Number Publication Date
GB1321749A true GB1321749A (en) 1973-06-27

Family

ID=19811548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5224971A Expired GB1321749A (en) 1970-11-13 1971-11-10 Videophone system

Country Status (11)

Country Link
JP (1) JPS5227974B1 (en)
AU (1) AU3551771A (en)
CA (1) CA940244A (en)
CH (1) CH542560A (en)
DE (1) DE2152877C3 (en)
ES (1) ES396900A1 (en)
FR (1) FR2113933B1 (en)
GB (1) GB1321749A (en)
IT (1) IT942819B (en)
NL (1) NL7016628A (en)
SE (1) SE365691B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675722A (en) * 1982-12-02 1987-06-23 Independent Broadcasting Authority Apparatus for deriving synchronization signals for component television video signal reception

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2389290A1 (en) * 1977-04-29 1978-11-24 Briand Marcel DEVICE FOR TRANSMISSION AND RECEPTION BY ANALOGUE LINES OF VIDEO-PHONE SIGNALS AND DIGITAL SIGNALS
FR2438401A1 (en) * 1978-10-05 1980-04-30 Thomson Csf METHOD FOR TRANSMITTING AN ANALOG AUDIO FREQUENCY SIGNAL DURING TELEVISION SIGNAL SYNCHRONIZATION INTERVALS AND DEVICE FOR CARRYING OUT SAID METHOD
FR2440669A1 (en) * 1978-10-31 1980-05-30 Thomson Brandt SYSTEM FOR BROADCASTING AUDIO-VISUAL TELEVISION SIGNALS SYNCHRONIZED BY A PILOT FREQUENCY AND METHOD FOR IMPLEMENTING SAME
IL58735A (en) * 1978-12-04 1982-01-31 Oak Industries Inc Subscription television coding system
EP0033306B1 (en) * 1980-01-22 1985-08-28 Paul Pierre Delogne Method and installation for transmitting television signals by means of a digital encoding of these signals
FR2524242B1 (en) * 1982-03-24 1986-02-07 Radiotechnique ENCRYPTION RECOGNITION CIRCUIT FOR TELEVISION BROADCASTING TRANSMISSION SYSTEM AND ENCRYPTED BROADCASTING TRANSMISSION SYSTEM INCLUDING SUCH A CIRCUIT
FR2524241A1 (en) * 1982-03-24 1983-09-30 Radiotechnique Receiver decoding control circuit for TV transmission system - uses phase locked loop and pseudo-random digital sequence generator to provide delay to line sync. signal
FR2552282B1 (en) * 1983-09-21 1990-07-13 Veillard Jacques METHOD AND DEVICE FOR CONSISTENT DEMODULATION OF DIGITALLY MODULATED CARRIER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4675722A (en) * 1982-12-02 1987-06-23 Independent Broadcasting Authority Apparatus for deriving synchronization signals for component television video signal reception

Also Published As

Publication number Publication date
FR2113933A1 (en) 1972-06-30
JPS5227974B1 (en) 1977-07-23
CA940244A (en) 1974-01-15
DE2152877C3 (en) 1978-09-14
DE2152877A1 (en) 1972-05-31
AU3551771A (en) 1973-05-17
IT942819B (en) 1973-04-02
SE365691B (en) 1974-03-25
DE2152877B2 (en) 1978-01-19
ES396900A1 (en) 1975-05-01
CH542560A (en) 1973-09-30
NL7016628A (en) 1972-05-16
FR2113933B1 (en) 1977-03-18
AU465455B2 (en) 1975-09-25

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Legal Events

Date Code Title Description
PS Patent sealed
429A Application made for amendment of specification (sect. 29/1949)
429H Application (made) for amendment of specification now open to opposition (sect. 29/1949)
429D Case decided by the comptroller ** specification amended (sect. 29/1949)
PCNP Patent ceased through non-payment of renewal fee