CH542560A - Video intercom - Google Patents

Video intercom

Info

Publication number
CH542560A
CH542560A CH1633671A CH1633671A CH542560A CH 542560 A CH542560 A CH 542560A CH 1633671 A CH1633671 A CH 1633671A CH 1633671 A CH1633671 A CH 1633671A CH 542560 A CH542560 A CH 542560A
Authority
CH
Switzerland
Prior art keywords
video intercom
intercom
video
Prior art date
Application number
CH1633671A
Other languages
German (de)
Inventor
Maria Verhoeckx Nico Alphonsus
Hoff Herman Van Der
Johannes Vos Cornelis Henricus
Wilhelmus Coenders Johannes
Original Assignee
Philips Nv
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 Nv filed Critical Philips Nv
Publication of CH542560A publication Critical patent/CH542560A/en

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)
  • Synchronizing For Television (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
CH1633671A 1970-11-13 1971-11-10 Video intercom CH542560A (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
CH542560A true CH542560A (en) 1973-09-30

Family

ID=19811548

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1633671A CH542560A (en) 1970-11-13 1971-11-10 Video intercom

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)

Families Citing this family (9)

* 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
DE3171957D1 (en) * 1980-01-22 1985-10-03 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
US4675722A (en) * 1982-12-02 1987-06-23 Independent Broadcasting Authority Apparatus for deriving synchronization signals for component television video signal reception
FR2552282B1 (en) * 1983-09-21 1990-07-13 Veillard Jacques METHOD AND DEVICE FOR CONSISTENT DEMODULATION OF DIGITALLY MODULATED CARRIER

Also Published As

Publication number Publication date
DE2152877B2 (en) 1978-01-19
DE2152877C3 (en) 1978-09-14
CA940244A (en) 1974-01-15
JPS5227974B1 (en) 1977-07-23
AU3551771A (en) 1973-05-17
FR2113933B1 (en) 1977-03-18
GB1321749A (en) 1973-06-27
ES396900A1 (en) 1975-05-01
SE365691B (en) 1974-03-25
AU465455B2 (en) 1975-09-25
IT942819B (en) 1973-04-02
DE2152877A1 (en) 1972-05-31
NL7016628A (en) 1972-05-16
FR2113933A1 (en) 1972-06-30

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Legal Events

Date Code Title Description
PL Patent ceased