GB2095071A - Video scrambling and descrambling means using frequency dependent delay means - Google Patents

Video scrambling and descrambling means using frequency dependent delay means Download PDF

Info

Publication number
GB2095071A
GB2095071A GB8206002A GB8206002A GB2095071A GB 2095071 A GB2095071 A GB 2095071A GB 8206002 A GB8206002 A GB 8206002A GB 8206002 A GB8206002 A GB 8206002A GB 2095071 A GB2095071 A GB 2095071A
Authority
GB
United Kingdom
Prior art keywords
delay
filter
scrambling
video signal
descrambling
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.)
Withdrawn
Application number
GB8206002A
Other languages
English (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.)
Oak Industries Inc
Original Assignee
Oak Industries 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 Oak Industries Inc filed Critical Oak Industries Inc
Publication of GB2095071A publication Critical patent/GB2095071A/en
Withdrawn legal-status Critical Current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
    • H04N7/169—Systems operating in the time domain of the television signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H15/00—Transversal filters
    • H03H15/02—Transversal filters using analogue shift registers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Filters That Use Time-Delay Elements (AREA)
  • Picture Signal Circuits (AREA)
  • Noise Elimination (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
GB8206002A 1981-03-13 1982-03-02 Video scrambling and descrambling means using frequency dependent delay means Withdrawn GB2095071A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US24347781A 1981-03-13 1981-03-13

Publications (1)

Publication Number Publication Date
GB2095071A true GB2095071A (en) 1982-09-22

Family

ID=22918909

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8206002A Withdrawn GB2095071A (en) 1981-03-13 1982-03-02 Video scrambling and descrambling means using frequency dependent delay means

Country Status (9)

Country Link
JP (1) JPS57168588A (enExample)
AU (1) AU8120782A (enExample)
BR (1) BR8201348A (enExample)
DE (1) DE3209301A1 (enExample)
FR (1) FR2501948A1 (enExample)
GB (1) GB2095071A (enExample)
GR (1) GR76055B (enExample)
IL (1) IL65111A0 (enExample)
NL (1) NL8201037A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186768A (en) * 1985-04-19 1987-08-19 Emc Datacare Ltd Video display unit with improved security

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD959894S1 (en) * 2019-12-06 2022-08-09 Re-Lid Engineering Ag Can end

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186768A (en) * 1985-04-19 1987-08-19 Emc Datacare Ltd Video display unit with improved security
GB2186768B (en) * 1985-04-19 1989-07-05 Emc Datacare Ltd Video display unit with improved security

Also Published As

Publication number Publication date
BR8201348A (pt) 1983-01-25
IL65111A0 (en) 1982-04-30
DE3209301A1 (de) 1982-10-21
AU8120782A (en) 1982-09-16
FR2501948A1 (fr) 1982-09-17
GR76055B (enExample) 1984-08-03
JPS57168588A (en) 1982-10-16
NL8201037A (nl) 1982-10-01

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)