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AU583131B2 - Video transmission system using time-warp scrambling - Google Patents

Video transmission system using time-warp scrambling

Info

Publication number
AU583131B2
AU583131B2 AU59174/86A AU5917486A AU583131B2 AU 583131 B2 AU583131 B2 AU 583131B2 AU 59174/86 A AU59174/86 A AU 59174/86A AU 5917486 A AU5917486 A AU 5917486A AU 583131 B2 AU583131 B2 AU 583131B2
Authority
AU
Australia
Prior art keywords
scrambling
warp
time
transmission system
video transmission
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.)
Ceased
Application number
AU59174/86A
Other versions
AU5917486A (en
Inventor
Jeffrey E. Frederiksen
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.)
Frederiksen & Shu Laboratories Inc
Original Assignee
Frederiksen & Shu Lab 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
Priority claimed from US06/565,023 external-priority patent/US4605961A/en
Application filed by Frederiksen & Shu Lab Inc filed Critical Frederiksen & Shu Lab Inc
Publication of AU5917486A publication Critical patent/AU5917486A/en
Application granted granted Critical
Publication of AU583131B2 publication Critical patent/AU583131B2/en
Anticipated expiration legal-status Critical
Ceased 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
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • 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
    • H04N7/1696—Systems operating in the time domain of the television signal by changing or reversing the order of active picture signal portions

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
AU59174/86A 1983-12-22 1986-06-24 Video transmission system using time-warp scrambling Ceased AU583131B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/565,023 US4605961A (en) 1983-12-22 1983-12-22 Video transmission system using time-warp scrambling

Publications (2)

Publication Number Publication Date
AU5917486A AU5917486A (en) 1988-01-07
AU583131B2 true AU583131B2 (en) 1989-04-20

Family

ID=24256889

Family Applications (1)

Application Number Title Priority Date Filing Date
AU59174/86A Ceased AU583131B2 (en) 1983-12-22 1986-06-24 Video transmission system using time-warp scrambling

Country Status (1)

Country Link
AU (1) AU583131B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU642157B2 (en) * 1989-11-14 1993-10-14 News Datacom Limited A system for controlling access to broadcast transmissions

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282249A (en) * 1989-11-14 1994-01-25 Michael Cohen System for controlling access to broadcast transmissions

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1888183A (en) * 1982-07-29 1984-02-23 Telease, Inc. Secure coding and decoding system and method for television program signals
AU559403B2 (en) * 1983-06-10 1987-03-12 General Instrument Corporation Video encryption system
AU561591B2 (en) * 1983-05-27 1987-05-14 General Instrument Corporation line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1888183A (en) * 1982-07-29 1984-02-23 Telease, Inc. Secure coding and decoding system and method for television program signals
AU561591B2 (en) * 1983-05-27 1987-05-14 General Instrument Corporation line
AU559403B2 (en) * 1983-06-10 1987-03-12 General Instrument Corporation Video encryption system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU642157B2 (en) * 1989-11-14 1993-10-14 News Datacom Limited A system for controlling access to broadcast transmissions

Also Published As

Publication number Publication date
AU5917486A (en) 1988-01-07

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