JPS5733878A - Cipher decoding system - Google Patents

Cipher decoding system

Info

Publication number
JPS5733878A
JPS5733878A JP10767880A JP10767880A JPS5733878A JP S5733878 A JPS5733878 A JP S5733878A JP 10767880 A JP10767880 A JP 10767880A JP 10767880 A JP10767880 A JP 10767880A JP S5733878 A JPS5733878 A JP S5733878A
Authority
JP
Japan
Prior art keywords
code
circuit
enable
enable code
receiving
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.)
Granted
Application number
JP10767880A
Other languages
Japanese (ja)
Other versions
JPS625512B2 (en
Inventor
Tsutomu Kanai
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.)
Faurecia Clarion Electronics Co Ltd
Original Assignee
Clarion Co 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 Clarion Co Ltd filed Critical Clarion Co Ltd
Priority to JP10767880A priority Critical patent/JPS5733878A/en
Publication of JPS5733878A publication Critical patent/JPS5733878A/en
Publication of JPS625512B2 publication Critical patent/JPS625512B2/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To make a receiving system having different enable codes into the receivable state optionally, by operating the enable code of the receiving side by operating the transmission side. CONSTITUTION:On a transmission side 1 are provided a circuit 3 for setting an enable code optionally, a circuit 4 for optionally sending out a control signal for taking out an enable code from a key code in a receiving side 2, to several kinds of receiving systems, and a circuit 5 for masking the enable code by converting operation, and these enable code and control signal are superposed on the blanking period of a vertical synchronizing signal of a video signal at a transmitting circuit 6, and are transmitted to the receiving side 2. In the receiving side 2, the key code which is inputted to a device 8 is taken out from a device 9 as an enable code by the control signal from the transmission side 1, and whether it coincides with the enable code which is masked and sent from the transmission side 1 or not is discriminated by a circuit 10.
JP10767880A 1980-08-07 1980-08-07 Cipher decoding system Granted JPS5733878A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10767880A JPS5733878A (en) 1980-08-07 1980-08-07 Cipher decoding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10767880A JPS5733878A (en) 1980-08-07 1980-08-07 Cipher decoding system

Publications (2)

Publication Number Publication Date
JPS5733878A true JPS5733878A (en) 1982-02-24
JPS625512B2 JPS625512B2 (en) 1987-02-05

Family

ID=14465199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10767880A Granted JPS5733878A (en) 1980-08-07 1980-08-07 Cipher decoding system

Country Status (1)

Country Link
JP (1) JPS5733878A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980080A (en) * 1982-10-30 1984-05-09 Pioneer Electronic Corp Visual-aural propriety controller of catv terminal device
JPS622737A (en) * 1985-06-28 1987-01-08 Sony Corp Decoder with addressing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5980080A (en) * 1982-10-30 1984-05-09 Pioneer Electronic Corp Visual-aural propriety controller of catv terminal device
JPS622737A (en) * 1985-06-28 1987-01-08 Sony Corp Decoder with addressing

Also Published As

Publication number Publication date
JPS625512B2 (en) 1987-02-05

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