FR2443778A1 - METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS - Google Patents

METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS

Info

Publication number
FR2443778A1
FR2443778A1 FR7929682A FR7929682A FR2443778A1 FR 2443778 A1 FR2443778 A1 FR 2443778A1 FR 7929682 A FR7929682 A FR 7929682A FR 7929682 A FR7929682 A FR 7929682A FR 2443778 A1 FR2443778 A1 FR 2443778A1
Authority
FR
France
Prior art keywords
encoding
video signals
decoding video
video signal
information
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.)
Granted
Application number
FR7929682A
Other languages
French (fr)
Other versions
FR2443778B1 (en
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.)
Oak Industries Inc
Original Assignee
Oak Industries Inc
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 Oak Industries Inc filed Critical Oak Industries Inc
Publication of FR2443778A1 publication Critical patent/FR2443778A1/en
Application granted granted Critical
Publication of FR2443778B1 publication Critical patent/FR2443778B1/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—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
    • H04N7/08—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
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/171—Systems operating in the amplitude domain of the television signal
    • H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals

Abstract

L'invention concerne les systèmes de télévision. Un codeur pour un système de télévision à abonnement comprend notamment un circuit de traitement de synchronisation 14 et un certain nombre de portes 16, 22, 30 qui atténuent le niveau des impulsions de synchronisation pendant les intervalles d'effacement verticaux et horizontaux du signal vidéo. Une information d'horloge et une information d'adresse sont insérées dans les intervalles atténués, et c'est le décodage de ces informations dans le récepteur qui permet de reconstituer un signal vidéo normal. Application aux systèmes de télévision à abonnementThe invention relates to television systems. An encoder for a subscription television system notably comprises a synchronization processing circuit 14 and a number of gates 16, 22, 30 which attenuate the level of the synchronization pulses during the vertical and horizontal erase intervals of the video signal. Clock information and address information are inserted in the attenuated intervals, and it is the decoding of this information in the receiver which makes it possible to reconstitute a normal video signal. Application to subscription television systems

FR7929682A 1978-12-04 1979-12-03 METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS Expired FR2443778B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US96594078A 1978-12-04 1978-12-04

Publications (2)

Publication Number Publication Date
FR2443778A1 true FR2443778A1 (en) 1980-07-04
FR2443778B1 FR2443778B1 (en) 1986-04-11

Family

ID=25510704

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7929682A Expired FR2443778B1 (en) 1978-12-04 1979-12-03 METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS

Country Status (12)

Country Link
JP (2) JPS5588481A (en)
AU (1) AU526049B2 (en)
BR (1) BR7907803A (en)
CA (1) CA1150818A (en)
CH (1) CH661398A5 (en)
DE (1) DE2947943C2 (en)
FR (1) FR2443778B1 (en)
GB (1) GB2038137B (en)
GR (1) GR82329B (en)
IL (1) IL58735A (en)
MX (1) MX147755A (en)
NL (1) NL188137C (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482815A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc DEVICE FOR ENCODING AND DECODING IMAGE AND SOUND SIGNALS
FR2482814A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS BY REPETITIVE INVERSION OF THE POLARITY OF THESE SIGNALS
FR2482813A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc ENCODING DEVICE AND IMAGE AND SOUND SIGNALS
EP0053885A2 (en) * 1980-12-10 1982-06-16 Jerrold Division General Instrument Corporation Protected television signal distribution system
EP0133190A1 (en) * 1983-08-01 1985-02-20 Payview Limited Encoding and decoding of a television signal
FR2572612A1 (en) * 1984-10-31 1986-05-02 Cgv Comp Gen Videotech Interface between video decoder and television receiver

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1338158C (en) * 1982-07-15 1996-03-12 John D. Lowry Encryption and decryption (scrambling and unscrambling) of video signals
JPS59152786A (en) * 1983-02-18 1984-08-31 Sanyo Electric Co Ltd Scrambling system in catv broadcast
DE3466636D1 (en) * 1983-02-18 1987-11-05 Sanyo Electric Co Scrambling system of television signal
EP0123505B1 (en) * 1983-04-21 1989-09-27 General Instrument Corporation Scrambling system for television video signal
US4594609A (en) * 1983-06-30 1986-06-10 Viewstar Inc. Scrambling system for television video signal
US4745476A (en) * 1984-02-15 1988-05-17 Matsushita Electric Industrial Co., Ltd. Television sound signal processing apparatus
DE3432653C1 (en) * 1984-09-05 1986-01-16 Westdeutscher Rundfunk, Anstalt des öffentlichen Rechts, 5000 Köln Method for transmitting television programmes to authorised subscribers
US4815129A (en) * 1985-01-02 1989-03-21 General Instrument Corp. Video encryption system
DE3638554A1 (en) * 1986-11-12 1988-05-26 Siemens Ag Method and arrangement for coding digital video signals
GB2216359B (en) * 1988-03-18 1992-05-20 Marconi Gec Ltd Synchronisation
AU6013394A (en) * 1993-01-15 1994-08-15 Nauchno-Proizvodstvennaya Firma 'elektronika Ltd.' Method of relaying data via teevision channels and a system for carrying out same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1287695A (en) * 1960-10-04 1962-03-16 Paramount Pictures Corp Pay TV systems
FR2113933A1 (en) * 1970-11-13 1972-06-30 Philips Nv
DE2439116A1 (en) * 1973-08-15 1975-07-03 System Dev Corp METHOD AND DEVICE FOR DISTORTING AND EQUALIZING TRANSMISSION SIGNALS

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3184537A (en) * 1960-10-04 1965-05-18 Paramount Pictures Corp Subscription-television system employing suppression of synchronizing signals
US3485941A (en) * 1965-04-12 1969-12-23 R & R Research Ltd Television system with modified sync signals and auxiliary timing information
JPS4924530A (en) * 1972-06-30 1974-03-05
JPS5236593B2 (en) * 1973-08-09 1977-09-16
JPS5120623A (en) * 1974-08-14 1976-02-19 Matsushita Electric Ind Co Ltd SHINGODENSO HOSHIKI
JPS5169927A (en) * 1974-12-13 1976-06-17 Fujitsu Ltd TEREBIJON FUKUGOEIZO SHINGOHOSHIKI
FR2313825A1 (en) * 1975-06-06 1976-12-31 Telediffusion Fse DATA DISSEMINATION SYSTEM
US4095258A (en) * 1976-10-15 1978-06-13 Blonder-Tongue Laboratories, Inc. Apparatus for decoding scrambled television and similar transmissions
JPS53113427A (en) * 1977-03-15 1978-10-03 Matsushita Electric Ind Co Ltd Sampling clock reproducer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1287695A (en) * 1960-10-04 1962-03-16 Paramount Pictures Corp Pay TV systems
FR2113933A1 (en) * 1970-11-13 1972-06-30 Philips Nv
DE2439116A1 (en) * 1973-08-15 1975-07-03 System Dev Corp METHOD AND DEVICE FOR DISTORTING AND EQUALIZING TRANSMISSION SIGNALS

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482815A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc DEVICE FOR ENCODING AND DECODING IMAGE AND SOUND SIGNALS
FR2482814A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc METHOD AND DEVICE FOR ENCODING AND DECODING VIDEO SIGNALS BY REPETITIVE INVERSION OF THE POLARITY OF THESE SIGNALS
FR2482813A1 (en) * 1980-05-14 1981-11-20 Oak Industries Inc ENCODING DEVICE AND IMAGE AND SOUND SIGNALS
EP0053885A2 (en) * 1980-12-10 1982-06-16 Jerrold Division General Instrument Corporation Protected television signal distribution system
EP0053885A3 (en) * 1980-12-10 1982-08-04 Jerrold Division General Instrument Corporation Protected television signal distribution system
EP0133190A1 (en) * 1983-08-01 1985-02-20 Payview Limited Encoding and decoding of a television signal
FR2572612A1 (en) * 1984-10-31 1986-05-02 Cgv Comp Gen Videotech Interface between video decoder and television receiver

Also Published As

Publication number Publication date
MX147755A (en) 1983-01-10
IL58735A (en) 1982-01-31
CH661398A5 (en) 1987-07-15
JPS5588481A (en) 1980-07-04
DE2947943C2 (en) 1985-04-18
FR2443778B1 (en) 1986-04-11
NL7908569A (en) 1980-06-06
IL58735A0 (en) 1980-02-29
NL188137B (en) 1991-11-01
NL188137C (en) 1992-04-01
JPS63131287U (en) 1988-08-26
GR82329B (en) 1984-12-13
GB2038137A (en) 1980-07-16
BR7907803A (en) 1980-07-29
AU526049B2 (en) 1982-12-16
AU5309779A (en) 1980-06-12
CA1150818A (en) 1983-07-26
DE2947943A1 (en) 1980-06-26
GB2038137B (en) 1983-04-13

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