EP0314931A2 - Méthode et dispositif de transmission d'une pluralité de signaux de contrôle dans des systèmes d'antennes - Google Patents

Méthode et dispositif de transmission d'une pluralité de signaux de contrôle dans des systèmes d'antennes Download PDF

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Publication number
EP0314931A2
EP0314931A2 EP88116534A EP88116534A EP0314931A2 EP 0314931 A2 EP0314931 A2 EP 0314931A2 EP 88116534 A EP88116534 A EP 88116534A EP 88116534 A EP88116534 A EP 88116534A EP 0314931 A2 EP0314931 A2 EP 0314931A2
Authority
EP
European Patent Office
Prior art keywords
antenna
signals
control signal
carrier
circuit
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.)
Withdrawn
Application number
EP88116534A
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German (de)
English (en)
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EP0314931A3 (fr
Inventor
Raffaello Ing. Pini
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.)
BRIONVEGA SpA
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BRIONVEGA SpA
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Filing date
Publication date
Application filed by BRIONVEGA SpA filed Critical BRIONVEGA SpA
Publication of EP0314931A2 publication Critical patent/EP0314931A2/fr
Publication of EP0314931A3 publication Critical patent/EP0314931A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/005—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using remotely controlled antenna positioning or scanning

Definitions

  • the present invention relates to an apparatus (and method) for trasmitting multiple control signals to an antenna, and in particular, but not exclusively, to an apparatus for transmitting adapted electrical signals for operating actuators associated to at least one receiving antenna in an apparatus for receiving direct TV signal from a satellite.
  • such an apparatus usually consists of a parabolic antenna and of a low noise converter, located inside the building, and its output signal, converted in the range between 950 and 1750 MHz and comprising multiple TV signals, is sent to an internal unit, located inside the building, and proximate, or inside, a television set, by means of a coaxial cable.
  • the external unit is usually powered through the cable that transmits the radio frequency signals.
  • the first medium frequency signal i.e. in the range of 950-1750 MHz
  • the first medium frequency signal i.e. in the range of 950-1750 MHz
  • one antenna can be used as far as it has a polar mounting and an adapted rotating mechanism.
  • a further case would be that of satellites having different orbital positions and different frequency ranges; in this case it is necessary to use two different antennas because, besides a different laying, they require two distinct signal conversion units.
  • Aim of the present invention is that of providing a method and apparatus for transmitting a plurality of control signals to devices located at the antennas that does not require any additional transmission cables.
  • a further aim of the present invention is that of providing a method, for transmitting a plurality of control signals to devices located at the antennas, that is simple, efficient, easy for the user and economic.
  • control signals are applied as frequency modulation on a carrier of lower frequency, such that does not interfere with the received working signal, and that such modulated frequency signal is respectively fed to the connecting means and picked up from the same means by means of mutually decoupling means, it is possible to utilize as connecting means a single cable connected to the at least one antenna and to the at least one internal receiving unit.
  • control signals applied as a frequency modulation are codified signals, preferably with a digital code
  • a plurality of commands can be transmitted through a single transmission means, and for that purpose it is possible to use integrated circuits, usually employed in ordinary remote controls in TV sets, automatic gates and similar devices, easily procured on the market as low priced mass products, thus achieving the proposed aims in a simple and effective way.
  • the system object of the present invention, aims at transmitting the direct voltage for powering the external unit and a low frequency carrier on the cable transmitting the radio frequency signal, for the short time necessary for the command.
  • the low frequency carrier is digitally codified by means of pulses and allows to control a plurality of functions, for each distinct code, in any selected point of the apparatus such as, for example, the "polarotor" control, the antenna rotation, the antennas switching, etc.
  • Each code is constituted by a word containing a number of "bits" and the binary information may, for example, be determined by the time distance of subsequent impulses.
  • a preferred solution of the present invention provides the use of devices (integrated circuits) currently employed in the remote controls of domestic TV sets.
  • Such per se known devices are employed, in the example described in the present invention, not to send infrared or supersonant signals, but just in order to generate and receive codified signals inserted, by means of adapted filters, on the high frequency cable connecting the antenna systems to the internal receiving unit for the satellite signals.
  • switch controls can be suitably used to control the "polarotor” or to switch the antennas, while the high resolution (tension ramp) can be used to rotate the parabola with a high precision aim.
  • the different switch and positioning functions can be memorized in at least sixteen memory cells coupled to the so called program push-buttons in order to be recalled subsequently by simply depressing one push-button.
  • the number of codes, and hence of distinct available control signals may be greater than the number now actually needed, but the extreme manufacturing semplicity and the low cost of such devices, which are mass-­produced, make their choice fully justifiable.
  • the parabolic antenna 1 has a polar mounting, a "polarotor” device 3 for switching polarization and a low noise converter/amplifier 4.
  • the parabolic antenna 5 has a "polarotor" device 6 for switching polarization,and a low noise converter/amplifier 7.
  • the interface decoder unit 200 has the following units: unit 8 is an high-pass filter that allows signals in the range of 950-1750 MHz to pass practically without loss, while the low frequency control signal coming from the decoder 24 of unit 100 is derived through the radio frequency block coil 9 and carried, through the condenser 10, to the decoder device 11.
  • Coil 32 has such a reactance as to block the low frequency control signal directed to the antennas, while, together with the radio frequency block coils 13, can close the direct current circuit and hence carry the power voltage to the converter/amplifiers of the parabolic antennas and, in case, also to the decoder unit 200.
  • the signals decoded by unit 11 are carried to the interface circuits 12 to operate the actuators such as, for example, switch 29 which, according to the command decoded by unit 11, allows to carry the radio frequency signal coming from the antenna 1 through cable 14, or the signal coming from the antenna 5 through cable 15, on the single transmission cable 16.
  • the interface circuit 12 is connected to the rotating device 2 of antenna 1 by means of cable 17, to the "polarotor" device 3 of antenna 1 by means of cable 18 and to the "polarotor” device 6 of antenna 5 by means of cable 19.
  • a high-pass filter 20 that allows the radio frequency signal in the range of 950-1750 MHz to pass without any detectable loss; this signal comes from the antenna through cable 16 and is sent to the internal unit 21, for receiving the satellite signal, whose output is connected to the TV set 22.
  • the matrix push-button panel 23 (provided on a remote control for example) has a number of push-buttons, or keys, each corresponding to a desired control function such as for example: left or right rotation of the antenna, switching between antennas, "polarotor" operation, etc.
  • the codifier circuit 24 By depressing one of the push-buttons the codifier circuit 24 generates a carrier modulated by the corresponding digital code, for as long as the push-button is depressed.
  • Coil 27 of unit 100 has such a reactance as to block the low frequency control signals directed towards receiver 21 and together with the radio frequency block coil 28, closes the direct current circuit and transmit power to unit 100.
  • the radio frequency working signal is completely transmitted from the amplifier/converter 4 of antenna 1 or from the amplifier/converter 7 of antenna 5 to the internal unit 21, while the low frequency signal is transmitted exclusively on the section of cable 16 comprised between units 100 and 200 for just the short time required to perform the command.
  • the satellite receiver 21 powers the entire system but, naturally, power may also be supplied by either unit 100 or unit 200.
  • panel 23 may also be provided with a memory push-button and further push-buttons in order to memorize several satellite aiming positions of the antenna, one for each push-button, to be recalled automatically depressing the corresponding button.
  • the codifier circuit 24 (based, for example, on the M708 integrated circuit available on the market) and the decoder 11 (based, for example, on the integrated circuit M490) will be made according to the specifications provided by the manufacturer of the selected devices (in this case "S.G.S"), while the interface circuit 12 will be made according to the type of actuators selected.
  • switch 29 may be of a fully electronic type, for example as those currently used for the inlets switching in the internal units for receiving satellite signals.
  • a great advantage resides in the fact that all signals, control signals and working signals, are transmitted through the single radio frequency transmission cable, preferably a coaxial cable, thus greatly simplifying the apparatus especially in the case of communal receiving apparatuses having a plurality of receivers.

Landscapes

  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Selective Calling Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP88116534A 1987-11-02 1988-10-06 Méthode et dispositif de transmission d'une pluralité de signaux de contrôle dans des systèmes d'antennes Withdrawn EP0314931A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2247887 1987-11-02
IT22478/87A IT1223038B (it) 1987-11-02 1987-11-02 Procedimento e apparecchiatura per l'invio di una molteplicita' di segnali di comando in impianti di antenna

Publications (2)

Publication Number Publication Date
EP0314931A2 true EP0314931A2 (fr) 1989-05-10
EP0314931A3 EP0314931A3 (fr) 1990-05-16

Family

ID=11196813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116534A Withdrawn EP0314931A3 (fr) 1987-11-02 1988-10-06 Méthode et dispositif de transmission d'une pluralité de signaux de contrôle dans des systèmes d'antennes

Country Status (2)

Country Link
EP (1) EP0314931A3 (fr)
IT (1) IT1223038B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2271669A (en) * 1992-10-02 1994-04-20 David Arends Control of antennas
FR2733654A1 (fr) * 1995-04-28 1996-10-31 Thomson Multimedia Sa Ensemble de reception pour television par satellite et procede de commande de fonctions
EP0878865A1 (fr) * 1997-05-07 1998-11-18 Lucent Technologies Inc. Système d'antenne amélioré et procédé associé
EP0521732B1 (fr) * 1991-07-04 1998-12-23 Sony Corporation Système d'antenne pour la réception de signaux de diffusion ou communication d'un satellite
FR2819671A1 (fr) * 2001-01-17 2002-07-19 Thomson Licensing Sa Systeme de reception pour television multi-tuners permettant de connecter automatiquement chaque tuner a au moins une antenne, quel que soit le nombre d'antennes qu'il comporte
CN103442274A (zh) * 2013-08-26 2013-12-11 深圳市九洲电器有限公司 一种卫星信号接收装置及方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4131839A (en) * 1977-08-19 1978-12-26 Springer Barry R System for multistation remote position indication and control
IT1108307B (it) * 1978-09-25 1985-12-09 Indesit Perfezionamenti a dispositivi di selezione di segnali con memoria
US4538175A (en) * 1980-07-11 1985-08-27 Microdyne Corporation Receive only earth satellite ground station
IT1135476B (it) * 1981-02-16 1986-08-20 Brionvega Spa Disposizione per l'orientamento automatico di una antenna in un radioricevitore o televisore per mezzo d'un telecomando
DE3134219A1 (de) * 1981-08-29 1983-03-10 Wilhelm Sihn jr. KG, 7532 Niefern-Öschelbronn Verfahren und schaltungsanordnung zur fernsteuerung von empfangsantennen
EP0196607B1 (fr) * 1985-03-25 1991-04-24 Kabushiki Kaisha Toshiba Système de réception d'émissions par satellite

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0521732B1 (fr) * 1991-07-04 1998-12-23 Sony Corporation Système d'antenne pour la réception de signaux de diffusion ou communication d'un satellite
GB2271669A (en) * 1992-10-02 1994-04-20 David Arends Control of antennas
FR2733654A1 (fr) * 1995-04-28 1996-10-31 Thomson Multimedia Sa Ensemble de reception pour television par satellite et procede de commande de fonctions
EP0878865A1 (fr) * 1997-05-07 1998-11-18 Lucent Technologies Inc. Système d'antenne amélioré et procédé associé
US6108526A (en) * 1997-05-07 2000-08-22 Lucent Technologies, Inc. Antenna system and method thereof
FR2819671A1 (fr) * 2001-01-17 2002-07-19 Thomson Licensing Sa Systeme de reception pour television multi-tuners permettant de connecter automatiquement chaque tuner a au moins une antenne, quel que soit le nombre d'antennes qu'il comporte
WO2002058381A1 (fr) * 2001-01-17 2002-07-25 Thomson Licensing S.A. Systeme de reception pour television multi-tuners permettant de connecter automatiquement chaque tuner a au moins une antenne, quel que soit le nombre d'antennes qu'il comporte
KR100854476B1 (ko) * 2001-01-17 2008-08-26 톰슨 라이센싱 텔레비전 수신을 위한 수신 시스템 및 방법
US7750980B2 (en) 2001-01-17 2010-07-06 Thomson Licensing Reception system for multiple-tuner television enabling to automatically connect each tuner to at least an antenna, whatever the number of antennae it comprises
CN103442274A (zh) * 2013-08-26 2013-12-11 深圳市九洲电器有限公司 一种卫星信号接收装置及方法
CN103442274B (zh) * 2013-08-26 2017-11-07 深圳市九洲电器有限公司 一种卫星信号接收装置及方法

Also Published As

Publication number Publication date
IT8722478A0 (it) 1987-11-02
EP0314931A3 (fr) 1990-05-16
IT1223038B (it) 1990-09-12

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