JPS637076B2 - - Google Patents

Info

Publication number
JPS637076B2
JPS637076B2 JP57172451A JP17245182A JPS637076B2 JP S637076 B2 JPS637076 B2 JP S637076B2 JP 57172451 A JP57172451 A JP 57172451A JP 17245182 A JP17245182 A JP 17245182A JP S637076 B2 JPS637076 B2 JP S637076B2
Authority
JP
Japan
Prior art keywords
signal
comb
jamming
circuit
channels
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
Application number
JP57172451A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5961384A (ja
Inventor
Masaru Takeshita
Hajime Ishizaka
Kiichi Yamamoto
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.)
NEC Home Electronics Ltd
Original Assignee
NEC Home Electronics 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 NEC Home Electronics Ltd filed Critical NEC Home Electronics Ltd
Priority to JP57172451A priority Critical patent/JPS5961384A/ja
Publication of JPS5961384A publication Critical patent/JPS5961384A/ja
Publication of JPS637076B2 publication Critical patent/JPS637076B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/80—Jamming or countermeasure characterized by its function
    • H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
    • H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/166—Passage/non-passage of the television signal, e.g. jamming, band suppression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K2203/00—Jamming of communication; Countermeasures
    • H04K2203/10—Jamming or countermeasure used for a particular application
    • H04K2203/14—Jamming or countermeasure used for a particular application for the transfer of light or images, e.g. for video-surveillance, for television or from a computer screen

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
JP57172451A 1982-09-30 1982-09-30 Ｃａｔｖシステム用ジヤミング信号発生装置 Granted JPS5961384A (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57172451A JPS5961384A (ja) 1982-09-30 1982-09-30 Ｃａｔｖシステム用ジヤミング信号発生装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57172451A JPS5961384A (ja) 1982-09-30 1982-09-30 Ｃａｔｖシステム用ジヤミング信号発生装置

Publications (2)

Publication Number Publication Date
JPS5961384A JPS5961384A (ja) 1984-04-07
JPS637076B2 true JPS637076B2 (pl) 1988-02-15

Family

ID=15942225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57172451A Granted JPS5961384A (ja) 1982-09-30 1982-09-30 Ｃａｔｖシステム用ジヤミング信号発生装置

Country Status (1)

Country Link
JP (1) JPS5961384A (pl)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208854A (en) * 1988-03-10 1993-05-04 Scientific-Atlanta, Inc. Picture carrier controlled automatic gain control circuit for cable television interdiction or jamming apparatus
US5142574A (en) * 1988-03-10 1992-08-25 West Jr Lamar Optimum amplitude and frequency of jamming carrier in interdiction program denial system
US5289541A (en) * 1988-03-10 1994-02-22 Scientific-Atlanta, Inc. Interdiction method and apparatus with constant blanking and variable dwell times
US5323462A (en) * 1988-03-10 1994-06-21 Scientific-Atlanta, Inc. CATV subscriber disconnect switch
US5014309A (en) * 1988-03-10 1991-05-07 Scientific-Atlanta, Inc. Off-premises cable television channel interdiction method and apparatus
US4912760A (en) * 1988-03-10 1990-03-27 Scientific Atlanta, Inc. Off-premises cable television channel interdiction method and apparatus
US5505901A (en) * 1988-03-10 1996-04-09 Scientific-Atlanta, Inc. CATV pay per view interdiction system method and apparatus
US5303295A (en) * 1988-03-10 1994-04-12 Scientific-Atlanta, Inc. Enhanced versatility of a program control by a combination of technologies
US5463689A (en) * 1988-03-10 1995-10-31 Scientific-Atlanta Interdiction method and apparatus with random mode jamming
US5287539A (en) * 1988-03-10 1994-02-15 Scientific-Atlanta, Inc. Interdiction program denial system for jamming audio and video signals
US4914695A (en) * 1988-11-03 1990-04-03 General Instrument Corporation Method and apparatus for frequency control of multiple oscillators using a single frequency-locked-loop
US5245420A (en) * 1990-11-27 1993-09-14 Scientific-Atlanta, Inc. CATV pay per view interdiction system
US5278908A (en) * 1992-06-10 1994-01-11 Scientific-Atlanta, Inc. Interdiction method and apparatus with programmable jamming effectiveness
WO1993026126A1 (en) * 1992-06-10 1993-12-23 Scientific-Atlanta, Inc. Interdiction method and apparatus with frequency change inhibit function
US5317635A (en) * 1992-06-10 1994-05-31 Scientific-Atlanta, Inc. Interdiction method and apparatus with mode control for variable frequency elements
WO1993026127A1 (en) * 1992-06-10 1993-12-23 Scientific-Atlanta, Inc. Interdiction method and apparatus with direct memory control of variable frequency elements

Also Published As

Publication number Publication date
JPS5961384A (ja) 1984-04-07

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