EP0314930A2 - Méthode et dispositif de transmission de signaux de contrôle aux organes de manoeuvre dans les récepteurs de télévision pour satellite - Google Patents

Méthode et dispositif de transmission de signaux de contrôle aux organes de manoeuvre dans les récepteurs de télévision pour satellite Download PDF

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Publication number
EP0314930A2
EP0314930A2 EP88116533A EP88116533A EP0314930A2 EP 0314930 A2 EP0314930 A2 EP 0314930A2 EP 88116533 A EP88116533 A EP 88116533A EP 88116533 A EP88116533 A EP 88116533A EP 0314930 A2 EP0314930 A2 EP 0314930A2
Authority
EP
European Patent Office
Prior art keywords
tension
external unit
power
power tension
signals
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Withdrawn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
EP88116533A
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German (de)
English (en)
Other versions
EP0314930A3 (fr
Inventor
Raffaello Pini
Francesco Banfi
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
Original Assignee
BRIONVEGA SpA
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Filing date
Publication date
Application filed by BRIONVEGA SpA filed Critical BRIONVEGA SpA
Publication of EP0314930A2 publication Critical patent/EP0314930A2/fr
Publication of EP0314930A3 publication Critical patent/EP0314930A3/fr
Withdrawn legal-status Critical Current

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    • 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 a method and an apparatus for transmitting control signals to actuators in television satellite receivers.
  • a television satellite receiver essentially consists of an external unit comprising a parabolic antenna and a low noise converter, located outside a building, and of an internal unit located at or inside, a television set.
  • the external unit output signal usually in the range of 950-1750 MHz and comprising a plurality of television signals,is transmitted to the internal unit by means of a suitable coaxial cable.
  • the low noise external amplifier/converter is usually powered by direct current through the radiofrequency signals transmission cable itself.
  • a user who wants to receive signals from both polarizations should therefore set up two low noise converters, one for each polarization, and then make a connection with the corresponding radiofrequency inlets on the internal unit by means of two separate coaxial cables.
  • the internal unit should also have a first switch system for carrying the direct power current on either cables, according to the selected polarization, and a second system for switching the radiofrequency signal on the single inlet amplifier of the internal unit.
  • polarization shifting devices for example those known as “polarotor”
  • polarotor polarization shifting devices
  • adapted control signals are required which, for example in the case of devices manufactured by "Chapparal", consist of rectangular waves in TTL (transistor-transistor logic) whose cycle is comprised between 17 and 21 milliseconds and in which the rectangular pulse width of the cycle varies between 0.8 and 2.2 milliseconds.
  • TTL transistor-transistor logic
  • PWM Pulse Width Modulation
  • the same antenna can be used as far as it has a polar mounting and an adapted rotating mechanism controlled by means of a multiple lead cable laid beside the radiofrequency transmission coaxial cable.
  • a further instance may be that of the ability of receiving satellites having different orbital positions and different frequency range thus requiring separate antennas, switch units and transmission cables.
  • the present invention aims at eliminating the inconveniences of the above described systems by making unnecessary the use of the multiple lead cables controlling the actuators.
  • the aim of the invention is achieved in a television satellite receiver, by the method and the apparatus outlined in the characterizing part of claims 1 and 3 respectively.
  • actuator control signals are transmitted by modulating the external unit power direct voltage, which usually overlaps the radiofrequency signals in the transmission coaxial cable, it is possible to use the same transmission coaxial cable to transmit the control signals, thus eliminating the need of additional separate cables to transmit such control signals.
  • the external unit operation is in no way affected.
  • integrated devices are used such as those employed in the remote controls of television sets, gates or similar devices.
  • the signal shape, modulating the external unit power voltage will be selected depending on the type of actuator to be controlled and it will be generally constituted by rectangular shaped single pulses having a set width, or by square waves with different working cycles, or by coded pulses.
  • the information modulating the external unit power direct voltage may be constituted by a square wave with a cycle comprised between 17 and 21 milliseconds and having a working cycle varying. at the selected polarization.
  • Fig. 1 schematically shows the connections arrangement according to the present invention in the antenna system for receiving satellite signals.
  • 1 is the first circuit means, of the arrangement according to the present invention, and substantially comprises a control push-button panel 2 activating a circuit 3 for generating single pulses, or square waves, or coded pulses.
  • Such pulses on connection 4, modulate the direct tension 5, for powering the external unit 14, by means of the modulator circuit 6.
  • connection 7 there will be the direct tension modulated by the signals on connecion 4.
  • the modulation range is such as to be a ripple overlapping the power tension and being less than 1 Volt, thus having no effect on the powering of the external unit which is always provided with a tension stabilizer.
  • Such modulated tension overlaps the radiofrequency signal on the coaxial cable 13, connecting the internal unit 9 to the external unit 14, by means of inductance 8 provided on the inlet circuit of the receiving unit 9.
  • Condenser 10 picks up the radiofrequency signal for the inlet amplifier 11.
  • the reference number 12 designates the television set on which the received signal is shown.
  • the modulation of the external unit power tension overlaps the radiofrequency signal on the coaxial cable 13 and constitutes the information for controlling actuator 15.
  • the second circuit means 17 of the arrangement according to the present invention is at the parabolic antenna 16.
  • Inductance 18 is at the circuit means 17 inlet and blocks the radiofrequency signals but lets the direct tension in undisturbed; the direct tension modulation, detected by circuit 19 and processed by interface 20, controls actuator 15 by means of connection 21.
  • Figure 2 shown as a non-limitative example, shows the electric circuit diagram of one of several practical embodiments of the circuit means of the arrangement, according to the present invention, for controlling a "polarotor" actuator device manufactured by "Chapparal”.
  • this device is controlled by square waves in TTL with a cycle comprised between 17 and 21 milliseconds and a pulse width that has to set on to fixed values, comprised between 0.8 and 2.2 millisecond, according to the selected polarization.
  • such square waves are generated in block 3 (fig.1) of the first circuit means 1, inside or at the receiving unit 9, and transmitted to the coaxial cable 13 as a modulation of the direct tension powering the external unit 14.
  • Fig.2 also shows the wave shapes of the circuit branches and arrows showing the originating point of each wave shape.
  • devices 101 and 102 are NAND type gates connected to constitute a bistable circuit such that signals of outlets 103 and 104 are always of opposite logic condition (if 103 is high, 104 is low and viceversa) and, in the present case, will be of +12 Volts and 0 Volts if +12 Volts is the power tension.
  • outlets 103 and 104 can be switched acting on either of push-buttons 105 and 106.
  • Integrated circuit 107 is a timer, used as an astable oscillator, generating a square wave having a pulse frequency and width determined by the RC time constants of the circuit.
  • the time constant is determined by condenser 108, by the resistance 109 and by the series of the resistance 110 and potentiometer 111 connected in parallel to the resistance 112 and potentiometer 113 assembly or to the resistance 112 and potentiometer 114 assembly depending on being high, i.e. positively connected, outlet 103 or outlet 104 of the bistable circuit.
  • Diodes 115 and 116 keep the potentiometer 113 and 114 circuits open when the corresponding outlets 103 and 104 of gates 101 and 102 are low, i.e. grounded.
  • Potentiometers 113 and 114 control the pulse width obtained in either situations so that the pulse width corresponds to that needed in order for the "polarotor" to let the signal pass in either polarizations.
  • the square wave, on connection 4, is sent to the base of the NPN transistor 118 by means of the resistive divider 119 or 120.
  • Transistor 118 will hence be either saturated or locked following the rithm of the base tension, namely transistor 118 will be saturated for the time corresponding to the positive pulse presence on the base and it will be instead locked for the time left of the base square wave cycle.
  • transistor 118 When, on the contrary, transistor 118 is locked, also transistor 121 is locked and therefore the tension on connection 7 will be lowered of about 0.7-0.8 Volts (diode 122 junction tension) relatively to its nominal value.
  • This modulated external unit power tension overlaps the radiofrequency signal on coaxial cable 13 by means of inductance 8 of the inlet circuit of internal unit 2.
  • the +15 Volts tension, modulated by the square wave, is received from coaxial cable 13 by means of inductance 18 and sent to the tension stabilizer 22 and to a voltage comparator 25 (block 19 in fig. 1).
  • Tension stabilizer 22 powers the circuit and the "polarotor" by means of connection 23, while the voltage comparator 25, polarized by means of resistances 31, 32, 33 and 34, detects the tension variations at its non reversing inlet and at its outlet there will be a square wave signal similar to the one generated by the integrated circuit 107 and having an amplitude variating between 0 and 15 Volts, if this is the power tension of comparator 25.
  • Such square wave tension has a pulse width which can assume two different values according to the adjustments operated by means of potentiometers 113 and 114 and this tension controls the "polarotor" which accordingly will let the signals of either polarizations to pass.
  • Fig. 3 shows an electric circuit diagram, as a non limitative example, of a further possible embodiment of the apparatus, according to the invention, for controlling a "polarotor" device made by "Chapparal".
  • the square waves controlling the device are not generated at, or inside, the internal unit.
  • Said pulses, transmitted in the coaxial cable as power tension modulation for the external unit, are picked up at the "polarotor" device, identified according to their width and then utilized to control the device by means of an adapted interface.
  • transistor 201 inserted in a monostable circuit, is normally saturated when at rest.
  • Transistor 202 is therefore also saturated, diode 203 is shortcircuited and the tension at connection 7 will be about equal to the power tension, in the present case 15 Volts.
  • transistor 201 By depressing either of push-buttons 205 or 206, transistor 201 is locked with a tension tied to the value of the resistive divider 207, 208 and 209.
  • this locking tension will be greater if push-button 205 has been depressed because the resistive divider 207, 208 and 209 will find the two resistance series 208 and 209 towards mass and therefore, as an effect of the time constant formed by condenser 210 and resistance 211, transistor 201 will reverse into saturation after a time T2 which is greater than a time T1 given by depressing push-button 206.
  • transistor 202 is locked and the power tension at connection 7 finds the diode 203 in series and therefore is lowered of about 0.7 Volts if this is the junction tension of diode 203.
  • the power tension at connection 7 will be negatively modulated by a single pulse having an amplitude of about 0.7 Volts and a width T1 or T2 >T1 depending on which of push-­buttons 206 or 205 in depressed.
  • This tension, powering the external unit overlaps the radiofrequency signal on coaxial cable 13 by means of the inductance 8 of the inlet circuit of receiving unit 9.
  • the external unit power tension of +15 Volts (the external unit is not illustrated here and is connected to the upper end of the AF cable) is picked up by coaxial cable 13 by means of inductance 18, which blocks the radiofrequency signals. The tension then reaches the tension stabilizer 22 and the tension comparator 220 (block 19 of fig.1).
  • the tension stabilizer 22 powers the circuit and the "polarotor" through connection 23 while the tension comparator 19, polarized by resistances 221, 222, 223 and 224, detects the tension variations as pulses, at its non inverting inlet, every time either of push-button 205 or 206 is depressed.
  • This inverted pulse reaches the monostable circuit, constituted by the gates 228 and 229 and by the time constant 230 and 231 and which is part of block 20 (fig.1).
  • This monostable circuit outlet signal available at connection 232 and sent to the DATA inlet of bistable circuit 233, is a pulse which starts simultaneously with the pulse on connection 226 and having a width determined by the values of resistance 231 and condenser 230. These components are such that this width T3 is greater than width T1, generated by depressing push-button 206, and less than width T2 generated by depressing push-button 205.
  • the pulse on outlet 225 is sent to the CLOCK inlet of circuit 233.
  • bistable circuit 233 By means of the particular connection of bistable circuit 233 within the circuit, its outlet Q on connection 234, takes the same logic status of the signal on its DATA inlet every time that the CLOCK signal goes from the logic status 0 to the logic status 1, which happens at the end of the pulse on connection 225.
  • connection 235 The -Q tension on connection 235 will assume the corresponding negative values.
  • the signal at connections 234 and 235 are used in the described interface circuit for inserting two different time constants in the astable circuit provided by timer 236, resistances 237, 238, 239, potentiometers 240, 241, 242 and condenser 243.
  • This circuit is similar to that of fig. 2 and therefore, at its outlet 21, provides a square wave having a pulse width of two different values depending on which of push-button 205 or 206 has been depressed.
  • Such pulse width is regulated, by means of potentiometers 240, 241 and 242, in order to control the "polarotor" device described for the selected polarizations.
  • control pulses have no influence whatsoever on the powering of the external unit which is always provided with a tension stabilizer 22.

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  • Selective Calling Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP88116533A 1987-11-02 1988-10-06 Méthode et dispositif de transmission de signaux de contrôle aux organes de manoeuvre dans les récepteurs de télévision pour satellite Withdrawn EP0314930A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2247987 1987-11-02
IT22479/87A IT1223039B (it) 1987-11-02 1987-11-02 Procedimento e apparecchiatura per l'invio di segnali di comando ad attuatori negli impianti di ricezione televisivi da satellite

Publications (2)

Publication Number Publication Date
EP0314930A2 true EP0314930A2 (fr) 1989-05-10
EP0314930A3 EP0314930A3 (fr) 1990-05-09

Family

ID=11196828

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116533A Withdrawn EP0314930A3 (fr) 1987-11-02 1988-10-06 Méthode et dispositif de transmission de signaux de contrôle aux organes de manoeuvre dans les récepteurs de télévision pour satellite

Country Status (2)

Country Link
EP (1) EP0314930A3 (fr)
IT (1) IT1223039B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2656176A1 (fr) * 1989-12-20 1991-06-21 Samsung Electronics Co Ltd Circuit generateur d'impulsions destine a un polarotar, ou dispositif de modification d'un angle de sonde, d'un recepteur d'emission par satellite.
EP0505038A1 (fr) * 1991-02-22 1992-09-23 Amstrad Public Limited Company Améliorations concernant les récepteurs de télévision
EP0510997A2 (fr) * 1991-04-24 1992-10-28 Sharp Kabushiki Kaisha Système de réception pour radiodiffusion par satellites
GB2271669A (en) * 1992-10-02 1994-04-20 David Arends Control of antennas
EP0740415A1 (fr) * 1995-04-25 1996-10-30 Sharp Kabushiki Kaisha Circuit commutateur pour un convertisseur de radiodiffusion par satellites
EP0878865A1 (fr) * 1997-05-07 1998-11-18 Lucent Technologies Inc. Système d'antenne amélioré et procédé associé
EP0918367A2 (fr) * 1997-11-19 1999-05-26 RR ELEKTRONISCHE GERÄTE GmbH & Co. KG Système de poursuite et méthode pour aligner une pivotante antenne à réflecteur avec une source de rayonnement
EP2286520B1 (fr) 2008-06-12 2016-12-14 Sato Holdings Corporation Conception d'antenne et système d'interrogation

Citations (4)

* 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
US4301397A (en) * 1980-04-24 1981-11-17 Cornell-Dubilier Electric Corporation DC Antenna rotator system
JPS609202A (ja) * 1983-06-28 1985-01-18 Sumitomo Electric Ind Ltd 受信アンテナ方向調整用の受信レベル計
US4538175A (en) * 1980-07-11 1985-08-27 Microdyne Corporation Receive only earth satellite ground station

Patent Citations (4)

* 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
US4301397A (en) * 1980-04-24 1981-11-17 Cornell-Dubilier Electric Corporation DC Antenna rotator system
US4538175A (en) * 1980-07-11 1985-08-27 Microdyne Corporation Receive only earth satellite ground station
JPS609202A (ja) * 1983-06-28 1985-01-18 Sumitomo Electric Ind Ltd 受信アンテナ方向調整用の受信レベル計

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 118 (E-316)[1841], 23rd May 1985; & JP-A-60 009 202 (SUMITOMO) 18-01-1985 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2656176A1 (fr) * 1989-12-20 1991-06-21 Samsung Electronics Co Ltd Circuit generateur d'impulsions destine a un polarotar, ou dispositif de modification d'un angle de sonde, d'un recepteur d'emission par satellite.
EP0505038A1 (fr) * 1991-02-22 1992-09-23 Amstrad Public Limited Company Améliorations concernant les récepteurs de télévision
EP0510997A2 (fr) * 1991-04-24 1992-10-28 Sharp Kabushiki Kaisha Système de réception pour radiodiffusion par satellites
EP0510997A3 (en) * 1991-04-24 1993-08-11 Sharp Kabushiki Kaisha Satellite broadcasting receiving system
GB2271669A (en) * 1992-10-02 1994-04-20 David Arends Control of antennas
EP0740415A1 (fr) * 1995-04-25 1996-10-30 Sharp Kabushiki Kaisha Circuit commutateur pour un convertisseur de radiodiffusion par satellites
US5649311A (en) * 1995-04-25 1997-07-15 Sharp Kabushiki Kaisha Switching circuit for a satellite broadcasting converter capable of assuring a high sensitivity
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
EP0918367A2 (fr) * 1997-11-19 1999-05-26 RR ELEKTRONISCHE GERÄTE GmbH & Co. KG Système de poursuite et méthode pour aligner une pivotante antenne à réflecteur avec une source de rayonnement
EP0918367A3 (fr) * 1997-11-19 2004-01-21 RR ELEKTRONISCHE GERÄTE GmbH & Co. KG Système de poursuite et méthode pour aligner une pivotante antenne à réflecteur avec une source de rayonnement
EP2286520B1 (fr) 2008-06-12 2016-12-14 Sato Holdings Corporation Conception d'antenne et système d'interrogation

Also Published As

Publication number Publication date
IT8722479A0 (it) 1987-11-02
IT1223039B (it) 1990-09-12
EP0314930A3 (fr) 1990-05-09

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