JPS56119588A - Pay television system - Google Patents

Pay television system

Info

Publication number
JPS56119588A
JPS56119588A JP805380A JP805380A JPS56119588A JP S56119588 A JPS56119588 A JP S56119588A JP 805380 A JP805380 A JP 805380A JP 805380 A JP805380 A JP 805380A JP S56119588 A JPS56119588 A JP S56119588A
Authority
JP
Japan
Prior art keywords
contract
output
memory
receiving system
wiretrap
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
JP805380A
Other languages
Japanese (ja)
Other versions
JPS625508B2 (en
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 JP805380A priority Critical patent/JPS56119588A/en
Publication of JPS56119588A publication Critical patent/JPS56119588A/en
Publication of JPS625508B2 publication Critical patent/JPS625508B2/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
    • H04N7/162—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 facilitate to revise the contract of the program category to prevent wiretrap due to wicked reorganization of the receiving system, by causing the subscriber to change contents of the digital switch, which is provided in the receiving system, to revise the contract of the category. CONSTITUTION:The ID code signal and the signal from digital switch 1 are half- added for every bit by half-adding circuit 2, and addition results of respective bits are output to output terminals O0-O7. These outputs are given to AND gates G1- G4 for the purpose of selecting upper addresses A4-A7 of memory 3 and the output of memory 3. Outputs of these AND gates are taken out to output terminal O through OR gate G5. Respective bits of this enable code are selected by lower addresses given to input terminals A0-A3 of memory 3. As a result, the contract of the program category is changed to prevent wiretrap due to wicked reorganization of the receiving system.
JP805380A 1980-01-25 1980-01-25 Pay television system Granted JPS56119588A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP805380A JPS56119588A (en) 1980-01-25 1980-01-25 Pay television system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP805380A JPS56119588A (en) 1980-01-25 1980-01-25 Pay television system

Publications (2)

Publication Number Publication Date
JPS56119588A true JPS56119588A (en) 1981-09-19
JPS625508B2 JPS625508B2 (en) 1987-02-05

Family

ID=11682583

Family Applications (1)

Application Number Title Priority Date Filing Date
JP805380A Granted JPS56119588A (en) 1980-01-25 1980-01-25 Pay television system

Country Status (1)

Country Link
JP (1) JPS56119588A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589017A (en) * 1981-04-02 1986-05-13 Katsumi Tobita Pay television receiving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589017A (en) * 1981-04-02 1986-05-13 Katsumi Tobita Pay television receiving system

Also Published As

Publication number Publication date
JPS625508B2 (en) 1987-02-05

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