GB796858A - Improvements in or relating to subscription television system - Google Patents

Improvements in or relating to subscription television system

Info

Publication number
GB796858A
GB796858A GB36022/54A GB3602254A GB796858A GB 796858 A GB796858 A GB 796858A GB 36022/54 A GB36022/54 A GB 36022/54A GB 3602254 A GB3602254 A GB 3602254A GB 796858 A GB796858 A GB 796858A
Authority
GB
United Kingdom
Prior art keywords
signal
control mechanism
sequence
pulses
generator
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
GB36022/54A
Other languages
English (en)
Inventor
Walter S Druz
Howard K Van Jepmond
Jack E Bridges
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
Priority to US370174A priority Critical patent/US2910526A/en
Application filed by Zenith Radio Corp filed Critical Zenith Radio Corp
Priority to GB36022/54A priority patent/GB796858A/en
Priority to GB12670/56A priority patent/GB796859A/en
Priority to DE1955Z0004656 priority patent/DE1073028B/de
Priority to BE534753D priority patent/BE534753A/xx
Priority to FR1120543D priority patent/FR1120543A/fr
Priority to CH342258D priority patent/CH342258A/de
Publication of GB796858A publication Critical patent/GB796858A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—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)
GB36022/54A 1953-07-24 1954-12-13 Improvements in or relating to subscription television system Expired GB796858A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US370174A US2910526A (en) 1953-07-24 1953-07-24 Secrecy communication system
GB36022/54A GB796858A (en) 1954-12-13 1954-12-13 Improvements in or relating to subscription television system
GB12670/56A GB796859A (en) 1954-12-13 1954-12-13 Improvements in or relating to secrecy communication systems
DE1955Z0004656 DE1073028B (de) 1954-12-13 1955-01-07 Druz Bensenville, 111 Howard K van Jepmond Evanston, 111 , und Jack E Bridges Franklin Park 111 (V St A) I Teilnehmerfernseh anlage zur Schlusselung eines Fernseh signals
BE534753D BE534753A (enExample) 1954-12-13 1955-01-10
FR1120543D FR1120543A (fr) 1954-12-13 1955-01-10 Système perfectionné de télévision par abonnement
CH342258D CH342258A (de) 1954-12-13 1955-01-11 Fernseh-Abonnementsanordnung

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
GB796858A true GB796858A (en) 1958-06-18

Family

ID=10384097

Family Applications (2)

Application Number Title Priority Date Filing Date
GB36022/54A Expired GB796858A (en) 1953-07-24 1954-12-13 Improvements in or relating to subscription television system
GB12670/56A Expired GB796859A (en) 1954-12-13 1954-12-13 Improvements in or relating to secrecy communication systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB12670/56A Expired GB796859A (en) 1954-12-13 1954-12-13 Improvements in or relating to secrecy communication systems

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)

Families Citing this family (6)

* 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
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

Also Published As

Publication number Publication date
US2910526A (en) 1959-10-27
FR1120543A (fr) 1956-07-09
CH342258A (de) 1959-11-15
GB796859A (en) 1958-06-18
BE534753A (enExample) 1958-10-10
DE1073028B (de) 1960-01-14

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