ES2076356T3 - Metodo y aparato de interdiccion de canales de television por cable para su instalacion exterior a los locales de los abonados. - Google Patents

Metodo y aparato de interdiccion de canales de television por cable para su instalacion exterior a los locales de los abonados.

Info

Publication number
ES2076356T3
ES2076356T3 ES90900676T ES90900676T ES2076356T3 ES 2076356 T3 ES2076356 T3 ES 2076356T3 ES 90900676 T ES90900676 T ES 90900676T ES 90900676 T ES90900676 T ES 90900676T ES 2076356 T3 ES2076356 T3 ES 2076356T3
Authority
ES
Spain
Prior art keywords
variable frequency
frequency
oscillators
calibration routine
interdiction
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 - Lifetime
Application number
ES90900676T
Other languages
English (en)
Inventor
Lamar E West Jr
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.)
Scientific Atlanta LLC
Original Assignee
Scientific Atlanta LLC
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 Scientific Atlanta LLC filed Critical Scientific Atlanta LLC
Application granted granted Critical
Publication of ES2076356T3 publication Critical patent/ES2076356T3/es
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • 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
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
    • 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
    • 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
    • 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)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Superheterodyne Receivers (AREA)
  • Near-Field Transmission Systems (AREA)
  • Communication Cables (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

SE PRESENTA UN APARATO DE INTERDICCION DE TELEVISION POR CABLE SIN PREMISAS QUE CONTIENE UN MICROPROCESADOR DE CONTROL PARA CONTROLAR Y CONMUTAR UNO O MAS OSCILADORES CONTROLADOS DE VOLTAJE DE FRECUENCIA VARIABLE. LOS OSCILADORES DE FRECUENCIA VARIABLE INTERFIEREN SELECTIVAMENTE SOLO LOS PROGRAMAS NO AUTORIZADOS TRANSMITIDOS SOBRE CANALES PARTICULARES DE UNA SEÑAL DE BANDA DE EMISION EMITIDA EN ABIERTO PARA UN SUBSCRIPTOR. EL MICROPROCESADOR DE CONTROL CONTROLA LOS OSCILADORES DE FRECUENCIA VARIABLE PARA QUE ESTOS SALTEN LAS FRECUENCIAS DE INTERFERENCIA E INTERFIERAN CANALES PARTICULARES BAJO CONTROL. UNA RUTINA DE CALIBRACION DE FRECUENCIA SE EJECUTA PERIODICAMENTE DESDE EL MOMENTO EN QUE EL APARATO SE ENCIENDE PARA DETERMINAR LOS PARAMETROS DE GANANCIA DE LOS OSCILADORES. UN OSCILADOR DE FRECUENCIA VARIABLE HETERODINA PUEDE ESTAR COMPRENDIDO EN EL SISTEMA DE INTERDICCION QUE MUEVE LA FRECUENCIA DEL OSCILADOR DE FRECUENCIA VARIABLE FUERA DE LA BANDA DE TELEVISION Y MEZCLA LA SALIDA DEL OSCILADOR DE FRECUENCIA VARIABLE CON UNA SALIDA DE UN OSCILADOR LOCAL FIJO PARA SUMINISTRAR UNA SEÑAL DE INTERFERENCIA QUE CAE DENTRO DE LA BANDA DE TELEVISION. ALTERNATIVAMENTE PUEDE USARSE UN CONTROL DE GANANCIA QUE MANEJA UN OSCILADOR HETERODINO PARA SU USO EN EL SISTEMA DE INTERDICCION, DICHO CONTROL USA UN CANAL DE SEÑAL DE LA BANDA DE EMISION COMO SEÑAL DE INTERFERENCIA. ALTERNATIVAMENTE, TAMBIEN PUEDE USARSE UN CONTROL DE GANANCIA AUTOMATICO PARA CONTROLAR LA ATENUACION DE UN ATENUADOR VARIABLE DE ACUERDO CON UNA FUNCION DE GANANCIA DETERMINADA MEDIANTE INTERPOLACION Y PREVIAMENTE ALMACENADA EN LA MEMORIA POR UNA RUTINA DE CALIBRACION QUE SE EJECUTA PERIODICAMENTE DESDE EL MOMENTO QUE EL APARATO SE ENCIENDE. LA RUTINA DE CALIBRACION PUEDE CORRER CONCURRENTEMENTE CON UNA RUTINA DE CALIBRACION DE FRECUENCIA PARA CONTROLAR LA FRECUENCIA DE LA SEÑAL DE INTERFERENCIA.
ES90900676T 1988-12-05 1989-12-04 Metodo y aparato de interdiccion de canales de television por cable para su instalacion exterior a los locales de los abonados. Expired - Lifetime ES2076356T3 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/279,619 US5014309A (en) 1988-03-10 1988-12-05 Off-premises cable television channel interdiction method and apparatus

Publications (1)

Publication Number Publication Date
ES2076356T3 true ES2076356T3 (es) 1995-11-01

Family

ID=23069738

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90900676T Expired - Lifetime ES2076356T3 (es) 1988-12-05 1989-12-04 Metodo y aparato de interdiccion de canales de television por cable para su instalacion exterior a los locales de los abonados.

Country Status (12)

Country Link
US (1) US5014309A (es)
EP (1) EP0446280B1 (es)
JP (1) JP3162371B2 (es)
KR (1) KR0139106B1 (es)
CN (1) CN1028468C (es)
AT (1) ATE124591T1 (es)
AU (1) AU4808890A (es)
CA (1) CA2003698C (es)
DE (1) DE68923294T2 (es)
ES (1) ES2076356T3 (es)
MX (1) MX165533B (es)
WO (1) WO1990006656A1 (es)

Families Citing this family (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287539A (en) * 1988-03-10 1994-02-15 Scientific-Atlanta, Inc. Interdiction program denial system for jamming audio and video signals
US5345504A (en) * 1988-03-10 1994-09-06 Scientific-Atlanta, Inc. Differential compensation control for off-premises CATV system
US5463689A (en) * 1988-03-10 1995-10-31 Scientific-Atlanta Interdiction method and apparatus with random mode jamming
US5231660A (en) * 1988-03-10 1993-07-27 Scientific-Atlanta, Inc. Compensation control for off-premises CATV system
US5289541A (en) * 1988-03-10 1994-02-22 Scientific-Atlanta, Inc. Interdiction method and apparatus with constant blanking and variable dwell times
US5144267A (en) * 1989-12-06 1992-09-01 Scientific-Atlanta, Inc. Variable slope network for off-premises CATV system
WO1992010038A1 (en) * 1990-11-27 1992-06-11 Scientific-Atlanta, Inc. Catv pay per view interdiction system method and apparatus
US5255318A (en) * 1991-03-22 1993-10-19 North American Philips Corporation Expandable cable television subscriber control system
US5140633A (en) * 1991-03-22 1992-08-18 North American Philips Corporation Cable subscriber control device using shared jamming modules
US5604528A (en) * 1992-06-10 1997-02-18 Scientific-Atlanta, Inc. Method and apparatus for providing periodic subscription television services
US5243651A (en) * 1992-06-10 1993-09-07 Scientific-Atlanta, Inc. Diagnostic method and apparatus for a cable television interdiction system
WO1993026127A1 (en) * 1992-06-10 1993-12-23 Scientific-Atlanta, Inc. Interdiction method and apparatus with direct memory control of variable frequency elements
US5317635A (en) * 1992-06-10 1994-05-31 Scientific-Atlanta, Inc. Interdiction method and apparatus with mode control for variable frequency elements
US5311325A (en) * 1992-06-10 1994-05-10 Scientific Atlanta, Inc. Method and apparatus for providing periodic subscription television services
US5495408A (en) * 1992-06-10 1996-02-27 Rockwell International Corporation Method and apparatus for signal tracking using feedback control loop
US5278908A (en) * 1992-06-10 1994-01-11 Scientific-Atlanta, Inc. Interdiction method and apparatus with programmable jamming effectiveness
US5243647A (en) * 1992-06-10 1993-09-07 Scientific-Atlanta, Inc. Method and apparatus for broadband signal distribution
WO1993026126A1 (en) * 1992-06-10 1993-12-23 Scientific-Atlanta, Inc. Interdiction method and apparatus with frequency change inhibit function
US5265160A (en) * 1992-06-10 1993-11-23 Scientific-Atlanta, Inc. Interdiction method and apparatus with pulsed mode jamming
US5396642A (en) * 1992-08-14 1995-03-07 Electroline Equipment Inc. Variable frequency CATV jamming method and apparatus
US5682426A (en) * 1993-07-12 1997-10-28 California Amplifier Subscriber site method and apparatus for decoding and selective interdiction of television channels
US5668946A (en) * 1993-09-01 1997-09-16 Zenith Electronics Corporation System for cable communication wherein interpretively coded data transmitted from headend selectively initiate loop free instruction sets stored in receiver-decoder to affect the behavior thereof
ES2099666B1 (es) * 1994-04-28 1998-02-01 Morilla Rodrigo C Martinez Limitador de recepcion de programas de television.
US5640452A (en) * 1995-04-28 1997-06-17 Trimble Navigation Limited Location-sensitive decryption of an encrypted message
US5790180A (en) * 1995-12-28 1998-08-04 At&T Corp. Video telephone call handling system and method
US6188870B1 (en) 1996-10-07 2001-02-13 General Instrument Corporation Passive interdiction system for scrambling
US6014547A (en) * 1997-04-28 2000-01-11 General Instrument Corporation System for enhancing the performance of a CATV settop terminal
US6144265A (en) * 1997-11-26 2000-11-07 Honeywell Inc. Calibrated high power radio frequency step attenuator
DE19956680C2 (de) * 1999-11-25 2001-10-25 Grundig Ag Steuerbare Antennendose zum selektiven Empfang von über ein Antennenkabel übertragenen Rundfunksignalen
US7222358B2 (en) 1999-12-13 2007-05-22 Finisar Corporation Cable television return link system with high data-rate side-band communication channels
US7257328B2 (en) 1999-12-13 2007-08-14 Finisar Corporation System and method for transmitting data on return path of a cable television system
DE10044193B4 (de) * 2000-09-07 2005-06-09 Ewt Elektro- U. Nachrichtentechnik Gmbh Verfahren und Vorrichtung zur Zugangskontrolle zu Programmangeboten oder Datendiensten in Antennenverteiler- oder Kabelanlagen
US7971225B2 (en) * 2002-02-08 2011-06-28 Finisar Corporation Bandpass component decimation and transmission of data in cable television digital return path
US7751718B2 (en) * 2002-02-12 2010-07-06 Finisar Corporation Efficient transmission of digital return path data in cable television return path
US8156535B2 (en) * 2002-02-12 2012-04-10 Finsar Corporation Data rate compression device for cable television return path using bandpass puncturing
US7725036B2 (en) 2002-02-12 2010-05-25 Finisar Corporation Efficient transmission of digital return path data in cable television return path
US7359447B2 (en) * 2002-02-19 2008-04-15 Finisar Corporation Asynchronous digital signal combiner and method of combining asynchronous digital signals in cable television return path
US7689128B2 (en) * 2002-10-30 2010-03-30 Finisar Corporation Return path transmitter with extended digital processing circuitry
US7519297B2 (en) 2002-11-08 2009-04-14 Finisar Corporation Cable television system with separate radio frequency hub and ethernet hub
CN2612188Y (zh) * 2003-04-29 2004-04-14 施志纣 具有频道分级选择功能的可寻址分支器
US7765576B2 (en) * 2004-05-12 2010-07-27 Finsiar Corporation Changing communication mode in a CATV pathway using mute commands
US7519078B2 (en) * 2004-05-12 2009-04-14 Finisar Corporation Automated ethernet configuration of CATV network
US8032916B2 (en) * 2004-05-12 2011-10-04 Finisar Corporation Single master clock control of Ethernet data transfer over both a cable TV return path and an Ethernet forward path
US8990881B2 (en) * 2009-03-30 2015-03-24 Ppc Broadband, Inc. Upstream bandwidth conditioning device
WO2014042615A1 (en) * 2012-09-11 2014-03-20 Empire Technology Development Llc Secured communication
EP3697004A3 (en) * 2019-02-15 2020-12-02 Tata Consultancy Services Limited System, method and machine-readable storage medium for disrupting unauthorized communications in low frequency radio communication devices
IT202100013946A1 (it) * 2021-05-27 2022-11-27 Emme Esse S P A Derivatore per impianti televisivi

Family Cites Families (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202758A (en) * 1961-11-09 1965-08-24 Paramount Pictures Corp Subscription-television programscrambling system
US3899633A (en) * 1972-05-12 1975-08-12 Columbia Pictures Ind Inc Subscription television system
US3760097A (en) * 1972-06-26 1973-09-18 Hughes Aircraft Co Adjacent catv channel jamming
US3882266A (en) * 1973-01-11 1975-05-06 Oak Industries Inc Apparatus for converting selected channels
US4085422A (en) * 1973-10-31 1978-04-18 Hokuryo Denko Co., Ltd. Fee-charging apparatus for television sets
US3896262A (en) * 1974-03-21 1975-07-22 Hughes Aircraft Co Subscription television jamming system
US4039954A (en) * 1975-05-27 1977-08-02 Oak Holland B.V. Signal distribution device for a cable television
USRE29997E (en) * 1974-12-24 1979-05-15 Oak Holland, B.V. Signal distribution device for a cable television
GB1554411A (en) * 1975-08-09 1979-10-17 Communications Patents Ltd Control systems
US3989887A (en) * 1975-08-28 1976-11-02 Gte Laboratories Incorporated Swept frequency trap jammer for secure television system
US4074311A (en) * 1976-06-18 1978-02-14 Tanner Electronic Systems Television security system
US4097894A (en) * 1976-11-01 1978-06-27 Tanner Electronics Systems Technology, Inc. Secured scramble decoder filter
US4091413A (en) * 1977-01-17 1978-05-23 Herman Richard E Security system for pay-TV channel
US4148064A (en) * 1978-01-09 1979-04-03 Gte Sylvania Incorporated Jamming circuit for television signals
US4222067A (en) * 1978-06-23 1980-09-09 Stern Joseph L Tamper-resistant television signal scrambling
US4343042A (en) * 1979-07-10 1982-08-03 Cablebus Systems Corporation Bi-directional data transmission and control system
US4334322A (en) * 1979-10-26 1982-06-08 E-Systems, Inc. Communication management system for providing antijam/privacy capabilities for voice radio communications
US4326289A (en) * 1980-02-28 1982-04-20 Dickinson Robert V C Expandable communication system
US4317213A (en) * 1980-05-09 1982-02-23 Dilorenzo Mark Television reception interfering apparatus
US4342119A (en) * 1980-08-27 1982-07-27 The United States Of America As Represented By The Secretary Of The Air Force Multi-tone jammer
US4434436A (en) * 1981-07-13 1984-02-28 Bruce Merrill Addressable premium channel obfuscation device for cable television systems
US4450481A (en) * 1981-08-25 1984-05-22 E-Com Corporation Tamper-resistant, expandable communications system
JPS58221577A (ja) * 1982-06-18 1983-12-23 Yagi Antenna Co Ltd Ｃａｔｖ信号分配方式
NL8301943A (nl) * 1982-07-01 1984-02-01 Plessey Overseas Zender.
JPS5961384A (ja) * 1982-09-30 1984-04-07 Nec Home Electronics Ltd Ｃａｔｖシステム用ジヤミング信号発生装置
US4521809A (en) * 1982-12-29 1985-06-04 North American Philips Corporation Method and apparatus for controlling access to selected television programs
US4636852A (en) * 1984-01-26 1987-01-13 Scientific-Atlanta, Inc. Scrambling and descrambling of television signals for subscription TV
JPS60245385A (ja) * 1984-05-18 1985-12-05 Pioneer Electronic Corp Ｃａｔｖシステムにおける集中視聴制御方式
JPS60253388A (ja) * 1984-05-30 1985-12-14 株式会社東芝 ケ−ブルテレビジヨンシステムのデ−タ処理装置
US4684980A (en) * 1984-05-31 1987-08-04 American Television & Communications Corporation System for controlling communications on a cable television network
US4673976A (en) * 1984-05-31 1987-06-16 American Television & Communications Corporation Cable television system data verification apparatus
US4754426A (en) * 1984-05-31 1988-06-28 American Television & Communications Corporation System for controlling communications on a cable television network
US4710956A (en) * 1984-05-31 1987-12-01 American Television & Communications Corporation Cable television system
JPS6194480A (ja) * 1984-10-15 1986-05-13 Pioneer Electronic Corp ジヤミング信号発生回路
US4682359A (en) * 1984-10-15 1987-07-21 Blonder-Tongue Laboratories, Inc. Television picture and sound scrambler and method
JPS61139176A (ja) * 1984-12-10 1986-06-26 Pioneer Electronic Corp Ｃａｔｖの視聴制御装置
US4691353A (en) * 1985-02-25 1987-09-01 Scientific Atlanta, Inc. Scrambling systems for CATV
JPS61230487A (ja) * 1985-04-04 1986-10-14 Pioneer Electronic Corp Ｃａｔｖシステムの特定チヤンネル妨害波混入方式
US4910791A (en) * 1985-12-26 1990-03-20 Am Communications, Inc. Monitoring and control of data communications
DE3618066C1 (de) * 1986-05-29 1987-12-03 Licentia Gmbh Verfahren zum dichten Verschliessen eines becherfoermigen aus Metall gefertigten Gehaeuses eines elektrischen Bauelements mit einem Deckel aus Kunststoff
US4837820A (en) * 1986-10-17 1989-06-06 Zenith Electronics Corporation Hybrid CATV scrambling system
US4825468A (en) * 1986-10-24 1989-04-25 Broadband Engineering, Inc. Video noise jammer
US4748667A (en) * 1986-11-04 1988-05-31 Scientific Atlanta Jamming signal scrambling and descrambling systems for CATV
US4825467A (en) * 1986-11-25 1989-04-25 International Telesystems, Inc. Restricted access television transmission system
US4841569A (en) * 1987-12-30 1989-06-20 General Instrument Corporation Secure video distribution system
EP0360778B1 (en) * 1988-09-23 1996-04-24 Electroline Equipment Inc A method and a device for jamming television 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

Also Published As

Publication number Publication date
MX165533B (es) 1992-11-18
AU4808890A (en) 1990-06-26
US5014309A (en) 1991-05-07
ATE124591T1 (de) 1995-07-15
CA2003698A1 (en) 1990-06-05
CA2003698C (en) 1995-10-03
KR0139106B1 (ko) 1998-05-15
JP3162371B2 (ja) 2001-04-25
DE68923294T2 (de) 1995-11-09
CN1046826A (zh) 1990-11-07
CN1028468C (zh) 1995-05-17
KR910700590A (ko) 1991-03-15
JPH04505078A (ja) 1992-09-03
EP0446280A1 (en) 1991-09-18
EP0446280B1 (en) 1995-06-28
DE68923294D1 (de) 1995-08-03
WO1990006656A1 (en) 1990-06-14

Similar Documents

Publication Publication Date Title
ES2076356T3 (es) Metodo y aparato de interdiccion de canales de television por cable para su instalacion exterior a los locales de los abonados.
KR920704517A (ko) 금지 프로그램 거부 시스템에 있어서 재밍 반송파의 최적 진폭 및 주파수
DE68927674T2 (de) Ausserhaus-fernsehkanalverbotverfahren und- anordnung
CA2071501A1 (en) Picture carrier controlled automatic gain control circuit for cable television interdiction or jamming apparatus
JP2009518980A (ja) 光ファイバ遅延線技術を組み込んだ通信とデータリンクのジャマー
GB2060292A (en) Transmit level control system
SE9400018D0 (sv) Förfarande och krets för val av inställning av en radiomottagare
KR840001984A (ko) 비데오 신호 피이크(peak) 시스템내의 보상 클램핑 회로
KR920702159A (ko) 가변일시 정지 시간을 갖는 인터딕션 장치 및 방법
MY117058A (en) Dynamic focus voltage amplitude controller
GB742140A (en) Improvements in or relating to subscription television system
KR930000649Y1 (ko) Tv세트의 비트발생 및 새튜레이션 발생 억제회로
KR100239348B1 (ko) 티브이 시스템의 인접 채널 간섭 자동 제거 장치 및 그 방법
KR0181418B1 (ko) 디지탈 제어 감쇄 장치
KR100238528B1 (ko) 무선통신 시스템의 송신차단방법
KR970009464B1 (ko) 텔레비젼 수상기의 음성간섭 제거회로
KR950016328A (ko) 텔레비젼 수상기의 자동꺼짐장치
KR970072992A (ko) 채널의 혼변조 방지가 가능한 무선주파수 (rf)변조장치
JP2518912Y2 (ja) スケルチ回路
KR970019522A (ko) 텔레비전의 음량레벨 자동조정장치 및 그 방법
KR20010005341A (ko) 레이다시스템의 누설전력 제거장치
KR980007664A (ko) 상향 증폭 모듈의 출력신호 조정회로
JPS5544201A (en) Multi-channel receiver selector for cable television
SU1840437A1 (ru) Устройство автоматического поиска каналов радиосвязи для адаптивных адресных систем
JPS60245386A (ja) Ｃａｔｖシステムにおける集中視聴制御方式

Legal Events

Date Code Title Description
FG2A Definitive protection

Ref document number: 446280

Country of ref document: ES