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JPS56119587A - Pay television system - Google Patents

Pay television system

Info

Publication number
JPS56119587A
JPS56119587A JP805280A JP805280A JPS56119587A JP S56119587 A JPS56119587 A JP S56119587A JP 805280 A JP805280 A JP 805280A JP 805280 A JP805280 A JP 805280A JP S56119587 A JPS56119587 A JP S56119587A
Authority
JP
Japan
Prior art keywords
signal
category
video signal
code
enable
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.)
Pending
Application number
JP805280A
Other languages
Japanese (ja)
Inventor
Masatane Kariya
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 JP805280A priority Critical patent/JPS56119587A/en
Publication of JPS56119587A publication Critical patent/JPS56119587A/en
Pending 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
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing

Landscapes

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

Abstract

PURPOSE:To prevent an audience from enjoying the television free of charge by reorganizing the receiving system and changing the category by using the memory output as the enable code to reproduce the original video signal before ciphered, by the category signal transmitted from the transmission side. CONSTITUTION:Demodulated video signal V is given to video signal reproducing equipment 1, and code signal CO is taken out from this signal V and is input to category decoder 2. In response to category signal CG extracted by this decoder 2, memory access circuit 3 takes out the signal, which is stored in a specific area of memory 4, as enable code E and sends it to decode control device 5. Lhis devices 5 responds to code signal CO and enable signal E to control video signal reproducing equipment 1 and reproduces the original video signal before ciphered. As a result the audience is prevented from reorganizing the receiving system and changing the category to wire trap the television.
JP805280A 1980-01-25 1980-01-25 Pay television system Pending JPS56119587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP805280A JPS56119587A (en) 1980-01-25 1980-01-25 Pay television system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP805280A JPS56119587A (en) 1980-01-25 1980-01-25 Pay television system

Publications (1)

Publication Number Publication Date
JPS56119587A true JPS56119587A (en) 1981-09-19

Family

ID=11682554

Family Applications (1)

Application Number Title Priority Date Filing Date
JP805280A Pending JPS56119587A (en) 1980-01-25 1980-01-25 Pay television system

Country Status (1)

Country Link
JP (1) JPS56119587A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024016A (en) * 1973-07-05 1975-03-14
JPS53121420A (en) * 1977-02-14 1978-10-23 Block Robert S System for billing toll television set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024016A (en) * 1973-07-05 1975-03-14
JPS53121420A (en) * 1977-02-14 1978-10-23 Block Robert S System for billing toll television set

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