JPH05912B2 - - Google Patents

Info

Publication number
JPH05912B2
JPH05912B2 JP57204636A JP20463682A JPH05912B2 JP H05912 B2 JPH05912 B2 JP H05912B2 JP 57204636 A JP57204636 A JP 57204636A JP 20463682 A JP20463682 A JP 20463682A JP H05912 B2 JPH05912 B2 JP H05912B2
Authority
JP
Japan
Prior art keywords
signal
output
waveform
outputs
filter
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 - Lifetime
Application number
JP57204636A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5994980A (ja
Inventor
Jun Yamada
Takeshi Murakami
Akitsuna Yuhara
Norio Hosaka
Juji Fujita
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP57204636A priority Critical patent/JPS5994980A/ja
Priority to US06/553,237 priority patent/US4630112A/en
Publication of JPS5994980A publication Critical patent/JPS5994980A/ja
Publication of JPH05912B2 publication Critical patent/JPH05912B2/ja
Granted 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
    • H04N7/171—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
JP57204636A 1982-11-24 1982-11-24 デイスクランブル装置 Granted JPS5994980A (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP57204636A JPS5994980A (ja) 1982-11-24 1982-11-24 デイスクランブル装置
US06/553,237 US4630112A (en) 1982-11-24 1983-11-18 Descrambling apparatus for a television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57204636A JPS5994980A (ja) 1982-11-24 1982-11-24 デイスクランブル装置

Publications (2)

Publication Number Publication Date
JPS5994980A JPS5994980A (ja) 1984-05-31
JPH05912B2 true JPH05912B2 (2) 1993-01-07

Family

ID=16493753

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57204636A Granted JPS5994980A (ja) 1982-11-24 1982-11-24 デイスクランブル装置

Country Status (2)

Country Link
US (1) US4630112A (2)
JP (1) JPS5994980A (2)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4748667A (en) * 1986-11-04 1988-05-31 Scientific Atlanta Jamming signal scrambling and descrambling systems for CATV
US5040211A (en) * 1988-10-13 1991-08-13 Massachusetts Institute Of Technology Reliable television transmission through analog channels
US5212723A (en) * 1991-08-08 1993-05-18 Macrovision Corp. Burst phase correction system for video descrambling

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2040881A5 (2) * 1969-04-16 1971-01-22 Thomson Csf
US4295155A (en) * 1979-06-08 1981-10-13 International Telephone And Telegraph Corporation Gray scale sync video processing system
CA1150821A (en) * 1981-03-19 1983-07-26 Northern Telecom Limited Transmission of data with a video signal

Also Published As

Publication number Publication date
US4630112A (en) 1986-12-16
JPS5994980A (ja) 1984-05-31

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