JPS5768981A - Scramble system for television signal - Google Patents

Scramble system for television signal

Info

Publication number
JPS5768981A
JPS5768981A JP55144580A JP14458080A JPS5768981A JP S5768981 A JPS5768981 A JP S5768981A JP 55144580 A JP55144580 A JP 55144580A JP 14458080 A JP14458080 A JP 14458080A JP S5768981 A JPS5768981 A JP S5768981A
Authority
JP
Japan
Prior art keywords
signal
transmitted
reception side
switch
synchronizing
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
JP55144580A
Other languages
Japanese (ja)
Other versions
JPS625513B2 (en
Inventor
Toshio Komori
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.)
NIPPON MARANTZ KK
Marantz Japan Inc
Original Assignee
NIPPON MARANTZ KK
Marantz Japan 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 NIPPON MARANTZ KK, Marantz Japan Inc filed Critical NIPPON MARANTZ KK
Priority to JP55144580A priority Critical patent/JPS5768981A/en
Publication of JPS5768981A publication Critical patent/JPS5768981A/en
Publication of JPS625513B2 publication Critical patent/JPS625513B2/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
    • H04N7/169—Systems operating in the time domain of the television signal
    • H04N7/1693—Systems operating in the time domain of the television signal by displacing synchronisation signals relative to active picture signals or vice versa

Abstract

PURPOSE:To enable to block the reproduction of picture surely and to make effective it for charged TV broadcast as long as a decoder is not provided, by transmitting a virtual synchronizing signal with shifted timing with a horizontal synchronizing signal on a TV signal transmitted from a transmission side and picking up the virtual synchronizing signal at the reception side. CONSTITUTION:An encoder 2 is provided at the front stage of a video transmitter 1. A signal switch 23 alternately switches parallel two synthesized signals CV2, CV3 during the horizontal blanking period according to the control signal, and a serially outputted scramble processing synthesis video signal CV4 is formed and transmitted to a transmitter 1 via a mixer 28. A switch 23 interrupts the signal CV4and outputs a DC voltage from voltage generating circuit 24 and makes control and synchronizing signals to the reception side. On the other hand, at the reception side, a TV signal received at an antenna 6 is amplified 51 via a selector switch 7 and it is corrected into a normal TV signal at an electronic control attenuator 52 and transmitted to a TV receiver 4.
JP55144580A 1980-10-16 1980-10-16 Scramble system for television signal Granted JPS5768981A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55144580A JPS5768981A (en) 1980-10-16 1980-10-16 Scramble system for television signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55144580A JPS5768981A (en) 1980-10-16 1980-10-16 Scramble system for television signal

Publications (2)

Publication Number Publication Date
JPS5768981A true JPS5768981A (en) 1982-04-27
JPS625513B2 JPS625513B2 (en) 1987-02-05

Family

ID=15365442

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55144580A Granted JPS5768981A (en) 1980-10-16 1980-10-16 Scramble system for television signal

Country Status (1)

Country Link
JP (1) JPS5768981A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156087A (en) * 1982-12-29 1984-09-05 ノ−ス・アメリカン・フイリツプス・コ−ポレ−シヨン Method and device for controlling access of subscriber to selected television program
EP1233620A1 (en) * 1991-11-19 2002-08-21 Macrovision Corporation Method and apparatus for concealing a composite video signal by use of sync wiggle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156087A (en) * 1982-12-29 1984-09-05 ノ−ス・アメリカン・フイリツプス・コ−ポレ−シヨン Method and device for controlling access of subscriber to selected television program
EP1233620A1 (en) * 1991-11-19 2002-08-21 Macrovision Corporation Method and apparatus for concealing a composite video signal by use of sync wiggle

Also Published As

Publication number Publication date
JPS625513B2 (en) 1987-02-05

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