GB2042846B - Secret television - Google Patents

Secret television

Info

Publication number
GB2042846B
GB2042846B GB8001983A GB8001983A GB2042846B GB 2042846 B GB2042846 B GB 2042846B GB 8001983 A GB8001983 A GB 8001983A GB 8001983 A GB8001983 A GB 8001983A GB 2042846 B GB2042846 B GB 2042846B
Authority
GB
United Kingdom
Prior art keywords
secret
television
secret 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
GB8001983A
Other versions
GB2042846A (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.)
PAYVIEW Ltd
Original Assignee
PAYVIEW Ltd
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 PAYVIEW Ltd filed Critical PAYVIEW Ltd
Priority to GB8001983A priority Critical patent/GB2042846B/en
Publication of GB2042846A publication Critical patent/GB2042846A/en
Application granted granted Critical
Publication of GB2042846B publication Critical patent/GB2042846B/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
    • H04N7/1713—Systems operating in the amplitude domain of the television signal by modifying synchronisation signals
    • 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
GB8001983A 1979-02-20 1980-01-21 Secret television Expired GB2042846B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8001983A GB2042846B (en) 1979-02-20 1980-01-21 Secret television

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7905858 1979-02-20
GB8001983A GB2042846B (en) 1979-02-20 1980-01-21 Secret television

Publications (2)

Publication Number Publication Date
GB2042846A GB2042846A (en) 1980-09-24
GB2042846B true GB2042846B (en) 1983-05-11

Family

ID=26270623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8001983A Expired GB2042846B (en) 1979-02-20 1980-01-21 Secret television

Country Status (1)

Country Link
GB (1) GB2042846B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59154887A (en) * 1983-02-23 1984-09-03 Sony Corp Video signal receiver
EP0133190A1 (en) * 1983-08-01 1985-02-20 Payview Limited Encoding and decoding of a television signal
US4577216A (en) * 1983-11-14 1986-03-18 Macrovision Method and apparatus for modifying the color burst to prohibit videotape recording
US5130810A (en) * 1983-11-23 1992-07-14 Macrovision Corporation Method and apparatus for processing a video signal so as to prohibit the making of acceptable videotape recordings
FR2559633B1 (en) * 1984-02-10 1989-01-13 Labo Cent Telecommunicat METHOD AND DEVICE FOR INVERTING A TELEVISION VIDEO SIGNAL
DE3731532A1 (en) * 1987-09-18 1989-03-30 Siemens Ag Process for transmitting encoded picture signals

Also Published As

Publication number Publication date
GB2042846A (en) 1980-09-24

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee