FR1120543A - Système perfectionné de télévision par abonnement - Google Patents

Système perfectionné de télévision par abonnement

Info

Publication number
FR1120543A
FR1120543A FR1120543DA FR1120543A FR 1120543 A FR1120543 A FR 1120543A FR 1120543D A FR1120543D A FR 1120543DA FR 1120543 A FR1120543 A FR 1120543A
Authority
FR
France
Prior art keywords
television system
subscription television
advanced
advanced subscription
television
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
Other languages
English (en)
French (fr)
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.)
Zenith Electronics LLC
Original Assignee
Zenith Radio Corp
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 Zenith Radio Corp filed Critical Zenith Radio Corp
Application granted granted Critical
Publication of FR1120543A publication Critical patent/FR1120543A/fr
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/006—Secret communication by varying or inverting the phase, at periodic or random intervals
    • 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
    • H04N7/169—Systems operating in the time domain of the television signal
    • H04N7/1693—Systems operating in the time domain of the television signal by displacing synchronisation signals relative to active picture signals or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Television Systems (AREA)
  • Noise Elimination (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
FR1120543D 1954-12-13 1955-01-10 Système perfectionné de télévision par abonnement Expired FR1120543A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB36022/54A GB796858A (en) 1954-12-13 1954-12-13 Improvements in or relating to subscription television system

Publications (1)

Publication Number Publication Date
FR1120543A true FR1120543A (fr) 1956-07-09

Family

ID=10384097

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1120543D Expired FR1120543A (fr) 1954-12-13 1955-01-10 Système perfectionné de télévision par abonnement

Country Status (6)

Country Link
US (1) US2910526A (enExample)
BE (1) BE534753A (enExample)
CH (1) CH342258A (enExample)
DE (1) DE1073028B (enExample)
FR (1) FR1120543A (enExample)
GB (2) GB796858A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2926214A (en) * 1957-09-26 1960-02-23 Zenith Radio Corp Subscription television system
US2972009A (en) * 1957-08-01 1961-02-14 Zenith Radio Corp Subscription television system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2486746A1 (fr) * 1980-07-11 1982-01-15 Telediffusion Fse Procede de brouillage et de debrouillage d'images de television
US4636852A (en) * 1984-01-26 1987-01-13 Scientific-Atlanta, Inc. Scrambling and descrambling of television signals for subscription TV
US4916736A (en) * 1988-06-07 1990-04-10 Macrovision Corporation Method and apparatus for encrypting and decrypting time domain signals
US5058157A (en) * 1989-09-06 1991-10-15 Macrovision Corporation Method and apparatus for encrypting and decrypting time domain signals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656407A (en) * 1949-02-12 1953-10-20 Zenith Radio Corp Subscriber signaling system
US2619530A (en) * 1949-11-19 1952-11-25 Zenith Radio Corp Control system for subscription type television receivers
US2816156A (en) * 1951-06-08 1957-12-10 Zenith Radio Corp Subscription television system
US2697741A (en) * 1953-04-29 1954-12-21 Zenith Radio Corp Subscription television system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2972009A (en) * 1957-08-01 1961-02-14 Zenith Radio Corp Subscription television system
US2926214A (en) * 1957-09-26 1960-02-23 Zenith Radio Corp Subscription television system

Also Published As

Publication number Publication date
US2910526A (en) 1959-10-27
GB796858A (en) 1958-06-18
CH342258A (de) 1959-11-15
GB796859A (en) 1958-06-18
BE534753A (enExample) 1958-10-10
DE1073028B (de) 1960-01-14

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