[go: up one dir, main page]

WO2011071468A1 - Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts - Google Patents

Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts Download PDF

Info

Publication number
WO2011071468A1
WO2011071468A1 PCT/US2009/006455 US2009006455W WO2011071468A1 WO 2011071468 A1 WO2011071468 A1 WO 2011071468A1 US 2009006455 W US2009006455 W US 2009006455W WO 2011071468 A1 WO2011071468 A1 WO 2011071468A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
filter
signals
satellite
determining
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.)
Ceased
Application number
PCT/US2009/006455
Other languages
English (en)
Inventor
David Glen White
Henri Girard
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.)
Thomson Licensing SAS
Original Assignee
Thomson Licensing SAS
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 Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP09795578.5A priority Critical patent/EP2510687B1/fr
Priority to US13/512,373 priority patent/US8973059B2/en
Priority to BR112012012103A priority patent/BR112012012103A2/pt
Priority to KR1020127014953A priority patent/KR101710085B1/ko
Priority to PCT/US2009/006455 priority patent/WO2011071468A1/fr
Priority to CN200980162627.4A priority patent/CN102668557B/zh
Priority to JP2012543054A priority patent/JP5646645B2/ja
Publication of WO2011071468A1 publication Critical patent/WO2011071468A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving

Definitions

  • the present invention generally relates to an apparatus for protecting a satellite reception system from strong terrestrial signals.
  • a high Q tunable trap is used to help reject strong ATSC signals or other signals that may be present on the input coaxial cable of a satellite receiver that operates in a single-wire multi-switch (SWM) environment.
  • SWM single-wire multi-switch
  • Satellite television signals are generally received at a dish antenna, processed by a low-noise block down-converter (LNB), and delivered through the home on coaxial cable to a set-top box (STB) associated with a television display device.
  • LNB low-noise block down-converter
  • STB set-top box
  • SWM single- wire multi-switch
  • satellite L-band signals (950-2150 MHz) coexist on the same coaxial cable as terrestrial ATSC or other signals from 50-806 MHz.
  • the ATSC signals can be strong enough to overload or damage the satellite front end and need to be attenuated to safe levels.
  • the power from ATSC signals may also cause unwanted attenuation of the desired satellite signal by a wideband RF automatic gain control (AGC) scheme.
  • AGC automatic gain control
  • With the upper frequency limit of the ATSC spectrum so close to the lower frequency limit of the satellite spectrum, it is difficult to design a satellite high-pass filter of reasonable complexity that can attenuate the ATSC signals without also impacting the lowest satellite frequencies.
  • an external diplexer is used to prevent ATSC signals from entering the satellite input connection. However, it would be advantageous if the satellite receiver could continue to operate even if the external diplexer was omitted from the installation.
  • the invention described herein addresses this and/or other problems.
  • the present invention concerns an apparatus for protecting a satellite reception system from strong terrestrial signals.
  • a high Q tunable trap is used to help reject strong ATSC signals or other signals that may be present on the input coaxial cable of a satellite receiver that operates in a single-wire multi-switch (SWM) environment.
  • SWM single-wire multi-switch
  • FIG. 1 is a diagram of an exemplary embodiment of a satellite television system
  • FIG. 2 is a diagram of an example of a power spectrum on a coaxial cable in an SWM environment
  • FIG. 3 is a block diagram of a portion of a satellite signal receiving system with a tunable trap circuit.
  • the present invention provides an apparatus for protecting a satellite reception system from strong terrestrial signals.
  • a high Q tunable trap is used to help reject strong ATSC signals or other signals that may be present on the input coaxial cable of a satellite receiver that operates in a single-wire multi-switch (SWM) environment.
  • SWM single-wire multi-switch
  • the present invention may be implemented in the signal tuning electronics of a satellite television set-top box or other device capable of tuning television signals.
  • the disclosed apparatus and technique may also be used in other signal reception applications.
  • FIG. 1 is a diagram of an exemplary embodiment of a satellite television system.
  • the satellite television system operates to broadcast microwave signals to a wide broadcast area by transmitting the signals from a geosynchronous satellite 110.
  • a geosynchronous satellite 1 0 orbits the earth once each day at approximately 35,786 kilometers above the surface of the Earth.
  • Such broadcast satellites 110 generally orbit around the equator and remain in the same position with respect to positions on the ground, allowing a satellite receiving antenna 20 to maintain a fixed look angle.
  • Satellite 110 receives signals from uplink transmitters and then rebroadcasts the signals back to earth using a set of transponders utilizing a variety of transmission frequencies.
  • the altitude of the transmitting satellite 1 10 allows subscribers in a wide geographical area to receive the signal.
  • LNB low noise block downconverter
  • SWM single-wire multi-switch
  • Splitters 145 and 165 may be used to split the signals to cables running to other set top boxes 160 and 180, connected to television display devices 170 and 190, respectively.
  • a similar configuration may exist in a cable-based installation.
  • a single feed from the local cable distribution system may enter the house and be split to coaxial cables running to multiple cable set-top boxes.
  • the cabling and splitters used to carry received satellite signals from SWM 135 to set-top boxes 140, 160, and 180, and carry control information back to the SWM 135, may also be used for communication between set-top boxes.
  • a set-top box 140 containing a DVR may provide access to recorded content to other set-top boxes 160 and 80 in the home.
  • the Multimedia over Coax Alliance (MoCATM) standard describes one method of providing such functionality.
  • these digital home networking (DHN) communications between boxes occur at frequencies below those for LNB-to-STB or SWM-to-STB communications.
  • satellite L-band signals may coexist on the same coaxial cable as terrestrial ATSC or other signals from 50-806MHz.
  • Figure 2 shows an example of such a signal spectrum that may be encountered by a satellite set top box.
  • Communications between the STBs and the SWM 210 reside at 2.3 MHz.
  • Satellite television signals 250 from the LNBs occupy the band from 950 MHz to 2150 MHz.
  • two ATSC signals 230 and 240 are present just below 950 MHz.
  • the ATSC signals may be strong enough to overload or damage the satellite front end, or may cause a wideband RF AGC detection scheme to reduce input gain, causing unwanted attenuation of the desired satellite signal.
  • a wideband RF AGC detection scheme to reduce input gain, causing unwanted attenuation of the desired satellite signal.
  • With the upper frequency limit of the ATSC spectrum so close to the lower frequency limit of the satellite spectrum, it is difficult to design a high-pass filter of reasonable complexity that can attenuate the ATSC signals without also impacting the lowest satellite frequencies.
  • an external diplexer is used to prevent ATSC signals from entering the satellite input connection. However, it would be advantageous if the satellite receiver could continue to operate even if the external diplexer was omitted from the installation.
  • Standard filters may also produce a level of insertion loss that reduces the input sensitivity of the front end.
  • a high Q notch filter may be added to the receiving system and tuned as needed in response to interfering signals in the ATSC frequency range.
  • the "Q” or “quality” factor of a filter refers to the sharpness of the filter or its ability to select the desired band and reject unwanted signals near the desired band.
  • the resonant frequency of the trap can be adjusted until the interfering signal is reduced to safe levels or the effect on gain control of the desired signal is minimized.
  • Figure 3 is a diagram of a portion of a satellite signal reception system 300 that includes such a tunable trap.
  • signals from the SWM are received and split to a high-pass filter 320 which passes the satellite band above 950 MHz and a band-pass filter 330 which passes B-band (250-750MHz) to the inputs of the RF front end 380.
  • the functions of the RF front end may vary, but will generally comprise a matching circuit, band-pass filter, low-noise amplifier, and mixing.
  • the RF front end 380 in this example acts as a 2x2 switch for routing signals to outputs connected to dual demodulator 390. In some implementations, an RF front end with a single SWM-capable input may be used.
  • the RF front end 380 also provides a wideband AGC function for adjusting the levels of the received signals.
  • the tunable trap circuit comprises capacitor 340 in series with inductor 350 and varactor diode 360, which is coupled to ground.
  • Demodulator 390 performs narrowband AGC for the channels of interest and provides a bias voltage to the tunable trap via resistor 370, which is connected between varactor diode 360 and inductor 350. The voltage applied by demodulator 390 sets the resonant frequency of the trap, and thus the range of frequencies that are attenuated.
  • Various control algorithms may be employed to tune the trap for rejection of the unwanted signals, but the method will generally comprise receiving a signal; filtering the received signal with a high-pass filter, measuring a signal parameter, adjusting a tunable trap responsive to the resulting measurement.
  • One possible method comprises reducing the level of the interfering signal through tuning of the trap until the total power seen by the wideband detection of the RF front end is no longer impacted appreciably.
  • Another potential method would involve using the B- band input and measuring the narrowband AGC value of the interfering signal. The tunable trap would then be tuned so as to minimize this value.
  • Another potential control parameter would be the input signal-to-noise ratio (SNR) of the desired signal at the demodulator.
  • SNR signal-to-noise ratio
  • assessment of the measured parameter could be used as a method of assessing the effect on ATSC signal rejection of various bias voltages and their corresponding trap center frequencies.
  • An iterative control algorithm may be used to seek an optimal value of the chosen parameter.
  • An additional consideration exists in non-SWM environments using more traditional DiseqC LNBs.
  • the receiver When operating with a DiseqC LNB, the receiver must tune satellite signals in the B-band. This may not be an issue with a diplexer topology, but in front ends where a single input is used, the tuned notch can cause unwanted losses within B-band. Care must be taken that either the varactor has sufficient tuning range to move its notch above 2150MHz or below 250MHz, or that an additional switch diode is available to disconnect the circuit from the RF path when it is not required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Noise Elimination (AREA)

Abstract

La présente invention porte sur un appareil pour protéger un système de réception satellite vis-à-vis de signaux terrestres forts. Un piège accordable à Q élevé est utilisé pour aider à rejeter des signaux ATSC forts ou d'autres signaux forts qui peuvent être présents sur le câble coaxial d'entrée d'un récepteur satellite qui fonctionne dans un environnement à multiples commutateurs à fil unique (SWM).
PCT/US2009/006455 2009-12-09 2009-12-09 Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts Ceased WO2011071468A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP09795578.5A EP2510687B1 (fr) 2009-12-09 2009-12-09 Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts
US13/512,373 US8973059B2 (en) 2009-12-09 2009-12-09 Method for protecting satellite reception from strong terrestrial signals
BR112012012103A BR112012012103A2 (pt) 2009-12-09 2009-12-09 método para proteger recepção de satélite contra sinais terrestres intensos
KR1020127014953A KR101710085B1 (ko) 2009-12-09 2009-12-09 강한 지상파 신호로부터 위성 수신을 보호하기 위한 방법
PCT/US2009/006455 WO2011071468A1 (fr) 2009-12-09 2009-12-09 Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts
CN200980162627.4A CN102668557B (zh) 2009-12-09 2009-12-09 保护卫星接收不受强地面信号影响的装置
JP2012543054A JP5646645B2 (ja) 2009-12-09 2009-12-09 信号処理のための装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2009/006455 WO2011071468A1 (fr) 2009-12-09 2009-12-09 Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts

Publications (1)

Publication Number Publication Date
WO2011071468A1 true WO2011071468A1 (fr) 2011-06-16

Family

ID=42340888

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/006455 Ceased WO2011071468A1 (fr) 2009-12-09 2009-12-09 Procédé pour protéger une réception satellite vis-à-vis de signaux terrestres forts

Country Status (7)

Country Link
US (1) US8973059B2 (fr)
EP (1) EP2510687B1 (fr)
JP (1) JP5646645B2 (fr)
KR (1) KR101710085B1 (fr)
CN (1) CN102668557B (fr)
BR (1) BR112012012103A2 (fr)
WO (1) WO2011071468A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9992525B1 (en) 2008-09-15 2018-06-05 The Directv Group, Inc. Method and system for inserting local channel insertion in a multi-terminal system
US8856843B1 (en) 2011-10-31 2014-10-07 The Directv Group, Inc. Method and system for adding local channels and program guide data at a user receiving device in an aggregated content distribution system
US8621530B1 (en) * 2011-10-31 2013-12-31 The Directv Group, Inc. Method and system for controlling user devices in an aggregated content distribution system
US8595770B2 (en) * 2011-10-31 2013-11-26 The Directv Group, Inc. Aggregated content distribution system and method for operating the same
CN103227909B (zh) * 2013-04-19 2016-03-23 深圳创维－Rgb电子有限公司 针对硅高频头的信号处理方法及装置
EP2830241B1 (fr) * 2013-07-23 2015-07-08 Advanced Digital Broadcast S.A. Procédé et système permettant de déterminer des paramètres d'un signal satellite
CN103544564A (zh) * 2013-10-16 2014-01-29 中国科学院对地观测与数字地球科学中心 一种松耦合的遥感卫星地面接收系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876739A (en) * 1985-10-30 1989-10-24 Capetronic (Bsr) Ltd. TVRO receiver system with low-cost video-noise reduction filter
WO1991011864A1 (fr) * 1990-01-24 1991-08-08 Astec International Limited Filtre antiparasite pour systemes de reception tvro
EP0779707A1 (fr) * 1995-12-14 1997-06-18 Thomson Consumer Electronics, Inc. Arrangement de filtrage HF comportant un circuit bouchon de fréquence image
EP1113604A2 (fr) * 1999-11-01 2001-07-04 Lucent Technologies Inc. Méthode et dispositif de filtrage pour rejeter un signal hôte dans un système de radiodiffusion audionumérique DAB
US20040235445A1 (en) * 2003-05-21 2004-11-25 Gomez Ramon A. Integrated tracking filters for direct conversion and low-IF single conversion broadband filters

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911366A (en) 1958-11-13 1975-10-07 Elie J Baghdady Receiver interference suppression techniques and apparatus
US3571715A (en) 1968-12-16 1971-03-23 Motorola Inc Overload compensation for antenna-tuning system
US4107730A (en) 1977-03-02 1978-08-15 Zenith Radio Corporation Signal strength responsive sound trap
US4263619A (en) 1979-04-20 1981-04-21 Rca Corporation Double trapping of adjacent channel sound
US4361909A (en) 1980-05-30 1982-11-30 Rca Corporation Pre-tuner tracking traps responsive to a tuning voltage
US4399559A (en) 1980-05-30 1983-08-16 Rca Corporation Voltage controlled tuner with voltage variable frequency selective arrangements controlled in response to a control voltage generated independently of the tuning voltage
US4499602A (en) 1983-06-28 1985-02-12 Rca Corporation Double conversion tuner for broadcast and cable television channels
JPS6230479A (ja) 1985-07-31 1987-02-09 Matsushita Electric Ind Co Ltd 妨害波除去装置
JPH07105737B2 (ja) * 1989-05-30 1995-11-13 パイオニア株式会社 受信装置
US5424674A (en) 1992-11-18 1995-06-13 The United States Of America As Represented By The Secretary Of The Army Wide dynamic range detection circuit
US6525630B1 (en) * 1999-11-04 2003-02-25 Paratek Microwave, Inc. Microstrip tunable filters tuned by dielectric varactors
US6492883B2 (en) * 2000-11-03 2002-12-10 Paratek Microwave, Inc. Method of channel frequency allocation for RF and microwave duplexers
GB0030965D0 (en) * 2000-12-19 2001-01-31 Nokia Oy Ab Improvements relating to satellite reception`
JP2003046403A (ja) 2001-08-01 2003-02-14 Nec Corp ダイレクトコンバージョン受信機
JP4332370B2 (ja) 2003-02-17 2009-09-16 マスプロ電工株式会社 放送受信システムおよび妨害波除去装置
JP2004349822A (ja) 2003-05-20 2004-12-09 Sharp Corp 衛星放送受信コンバータ
JP4251917B2 (ja) * 2003-05-29 2009-04-08 クラリオン株式会社 Ｔｖ放送受信装置およびそのチューニング方法
JP2005333528A (ja) * 2004-05-21 2005-12-02 Matsushita Electric Ind Co Ltd 妨害波除去装置
CN101010884A (zh) * 2004-09-08 2007-08-01 皇家飞利浦电子股份有限公司 用于组合调谐器的可切换频带跟踪输入滤波器
WO2009075779A1 (fr) 2007-12-07 2009-06-18 Thomson Licensing Algorithme de logiciel de récepteur satellite servant à empêcher la surcharge du récepteur par des signaux d'entrée puissants de multiporteuses
JP7105737B2 (ja) * 2018-06-29 2022-07-25 キヤノン株式会社 画像処理装置、画像処理方法、及びプログラム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4876739A (en) * 1985-10-30 1989-10-24 Capetronic (Bsr) Ltd. TVRO receiver system with low-cost video-noise reduction filter
WO1991011864A1 (fr) * 1990-01-24 1991-08-08 Astec International Limited Filtre antiparasite pour systemes de reception tvro
EP0779707A1 (fr) * 1995-12-14 1997-06-18 Thomson Consumer Electronics, Inc. Arrangement de filtrage HF comportant un circuit bouchon de fréquence image
EP1113604A2 (fr) * 1999-11-01 2001-07-04 Lucent Technologies Inc. Méthode et dispositif de filtrage pour rejeter un signal hôte dans un système de radiodiffusion audionumérique DAB
US20040235445A1 (en) * 2003-05-21 2004-11-25 Gomez Ramon A. Integrated tracking filters for direct conversion and low-IF single conversion broadband filters

Also Published As

Publication number Publication date
CN102668557A (zh) 2012-09-12
JP2013513994A (ja) 2013-04-22
KR101710085B1 (ko) 2017-02-24
JP5646645B2 (ja) 2014-12-24
KR20120101443A (ko) 2012-09-13
CN102668557B (zh) 2015-11-25
EP2510687B1 (fr) 2017-08-09
EP2510687A1 (fr) 2012-10-17
US8973059B2 (en) 2015-03-03
BR112012012103A2 (pt) 2016-04-05
US20120240168A1 (en) 2012-09-20

Similar Documents

Publication Publication Date Title
EP0149533B2 (fr) Appareil pour la réception de signaux SHF
US20120025929A1 (en) Filter with improved impedance match to a hybrid coupler
US8973059B2 (en) Method for protecting satellite reception from strong terrestrial signals
US9369107B2 (en) Apparatus and method for filtering singals in a receiver
US20120225626A1 (en) Reuse of a switch ic as a step attenuator
EP1344322A2 (fr) Ameliorations relatives a la reception satellite
US5999137A (en) Integrated antenna system for satellite terrestrial television reception
US7505088B2 (en) Signal selector selecting one of a ground wave digital signal and a digital cable television signal in accordance with program selection information and transmits the selected signal to a tuner
KR20150030665A (ko) 다이플렉서 회로에 전기 전력 또는 제어 신호들을 삽입하기 위한 장치 및 방법
US20110292989A1 (en) Apparatus, systems and methods of signal compensation for different signals communicated over a coaxial cable system
US20060154602A1 (en) Satellite signal receiving system
JPH1056391A (ja) 衛星又はマルチチャンネル多点配信システム局を介して送信されたプログラムの受信装置
US20160127122A1 (en) Quadricorrelator carrier frequency tracking
US9525920B2 (en) Method and apparatus for tracking transmission level of a home network signal in a broadcast signal receiving device
US20070082637A1 (en) Multi-tuner system, single package dual tuning system and receiver and television using the same
WO2015164445A1 (fr) Appareil et procédé pour commander un courant dans un dispositif dû à un événement de décharge électrostatique ou de surtension
KR101079604B1 (ko) 위성 수신기의 위성방송 신호 분석장치
US20080216128A1 (en) Apparatus for Receiving Satellite Broadcasting and Method Thereof
US20030218697A1 (en) Broadband television tuner front end
KR850001715B1 (ko) 위성방송 텔레비젼의 수신장치
EP2159873A1 (fr) Appareil de réception d'ondes de diffusion
WO2018106402A1 (fr) Système et appareil de protection contre les surtensions
JPS63217833A (ja) 増幅器

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200980162627.4

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09795578

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 13512373

Country of ref document: US

ENP Entry into the national phase

Ref document number: 20127014953

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2012543054

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2009795578

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2009795578

Country of ref document: EP

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112012012103

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112012012103

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20120521