GB1557741A - Subscription television system - Google Patents

Subscription television system

Info

Publication number
GB1557741A
GB1557741A GB1776077A GB1776077A GB1557741A GB 1557741 A GB1557741 A GB 1557741A GB 1776077 A GB1776077 A GB 1776077A GB 1776077 A GB1776077 A GB 1776077A GB 1557741 A GB1557741 A GB 1557741A
Authority
GB
United Kingdom
Prior art keywords
television system
subscription television
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
GB1776077A
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.)
TELEGLOBE PAY TV SYSTEM Inc
Original Assignee
TELEGLOBE PAY TV SYSTEM 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 TELEGLOBE PAY TV SYSTEM Inc filed Critical TELEGLOBE PAY TV SYSTEM Inc
Priority to GB1776077A priority Critical patent/GB1557741A/en
Publication of GB1557741A publication Critical patent/GB1557741A/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
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/171—Systems operating in the amplitude domain of the television signal
    • H04N7/1716—Systems operating in the amplitude domain of the television signal by inverting the polarity of active picture signal portions

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
GB1776077A 1977-04-28 1977-04-28 Subscription television system Expired GB1557741A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1776077A GB1557741A (en) 1977-04-28 1977-04-28 Subscription television system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1776077A GB1557741A (en) 1977-04-28 1977-04-28 Subscription television system

Publications (1)

Publication Number Publication Date
GB1557741A true GB1557741A (en) 1979-12-12

Family

ID=10100744

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1776077A Expired GB1557741A (en) 1977-04-28 1977-04-28 Subscription television system

Country Status (1)

Country Link
GB (1) GB1557741A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
GB2172463A (en) * 1984-03-12 1986-09-17 Dunn Instr Inc Display for an image of normal or inverse polarity
US4642688A (en) * 1983-06-24 1987-02-10 Scientific Atlanta, Inc. Method and apparatus for creating encrypted and decrypted television signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4642688A (en) * 1983-06-24 1987-02-10 Scientific Atlanta, Inc. Method and apparatus for creating encrypted and decrypted television signals
GB2172463A (en) * 1984-03-12 1986-09-17 Dunn Instr Inc Display for an image of normal or inverse polarity
GB2172463B (en) * 1984-03-12 1989-07-19 Dunn Instr Inc Method and apparatus for controlling video display means for generating from a video signal normal or inverted images for photographing

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years

Effective date: 19970427