EP0405004A2 - Satellite receipt installation - Google Patents

Satellite receipt installation Download PDF

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Publication number
EP0405004A2
EP0405004A2 EP89112651A EP89112651A EP0405004A2 EP 0405004 A2 EP0405004 A2 EP 0405004A2 EP 89112651 A EP89112651 A EP 89112651A EP 89112651 A EP89112651 A EP 89112651A EP 0405004 A2 EP0405004 A2 EP 0405004A2
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EP
European Patent Office
Prior art keywords
satellite
channel
dbs
frequency range
communication
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Application number
EP89112651A
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German (de)
French (fr)
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EP0405004A3 (en
Inventor
Wolfgang Weitzel
Gerhard Ostheimer
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Hirschmann Electronics GmbH and Co KG
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Hirschmann Electronics GmbH and Co KG
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Publication of EP0405004A2 publication Critical patent/EP0405004A2/en
Publication of EP0405004A3 publication Critical patent/EP0405004A3/en
Withdrawn legal-status Critical Current

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    • 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 invention is based on a satellite reception system according to the preamble of claim 1, wherein currently only TV channels are affected because FM audio broadcast channels are not yet emitted by satellites via their own transponders.
  • the 1st satellite intermediate frequency range (0.95 to 1.75 GHz) offers a bandwidth of 800 MHz for signal transmission.
  • the DBS satellites (e.g. TV-Sat .., TDF ..) occupy a channel bandwidth of 27 MHz, which means that the channel grid described for the 1st satellite intermediate frequency range can be optimally filled.
  • the channels of the communication satellites (Eutel-Sat .., Intel-Sat ..), on the other hand, have a channel bandwidth of 36 MHz, so that when they are (co-) transmitted in the 1st satellite intermediate frequency range, depending on their number, considerably less in individual cases than the 40 channels mentioned have space.
  • the invention is therefore based on the object of To further develop the receiving system of the type specified in the preamble of claim 1 such that an optimal channel assignment is possible in the 1st satellite intermediate frequency range even when transmitting communication satellite channels - whether exclusively or together with DBS channels.
  • a filter which selects the respective channel and suppresses the broadband noise, is connected upstream of the frequency divider, which is expediently implemented in digital technology.
  • the invention is therefore of course not limited to the reception of signals from the currently radiating communication satellites (possibly together with those from DBS satellites), but also includes - in the future possibly transmitted - FM signals whose channel bandwidth is at least approximately an integer multiple (s). of the raster channel bandwidth in the 1st satellite intermediate frequency range, the digital frequency divider then having the division factor n.
  • the advantage is achieved that both the input filter mentioned and a filter connected downstream of the frequency divider for suppressing the harmonics generated by the latter do not have to be tunable and are therefore simple and inexpensive to produce.
  • better filter selection properties can be achieved at lower frequencies.
  • FIG. 1 shows the basic structure of such a satellite reception system and
  • FIG. 2 shows the block diagram of a converter unit contained therein.
  • DBS signals are received in a first satellite receiving antenna SA1, converted into channels of the DBS channel grid in the first satellite intermediate frequency range in an integrated "outdoor unit” OU1 and fed to a first distributor V1.
  • Channels of a communication satellite eg ECS 1 are received with a second satellite receiving antenna SA2, converted into free areas of the 1st satellite intermediate frequency range by means of an outdoor unit OU2 and fed to a second distributor V2.
  • This is followed by a converter unit UE1 to UE5 for each of five user channels, in which the channels are each converted to a lower frequency range, divided by the factor 2 and converted into a free channel in the channel grid of the 1st satellite intermediate frequency range.
  • the outputs of the converter units UE1 to UE5 are interconnected via a third distributor V3 and fed to the first distributor V1, whose output line L distributes the signals in a subsequent communal or cable system.
  • Each converter unit UE1 to UE5 consists, in succession from input E to output A, of a down-converter U1 having a tunable oscillator O1 and a mixer M1, a permanently tuned first filter F1, a control amplifier RV, a digital frequency divider FT, and a permanently tuned second Filter F2, a step-up converter U2 having a tunable oscillator O2 and a mixer M2, a post-amplifier NV and a tunable filter F3.
  • first (input) filter F1 (480 MHz) this channel is filtered out very selectively and the broadband noise is reduced below a non-disturbing value.
  • the bandwidth corresponds to the frequency swing of the mentioned channel of 36 MHz.
  • the control amplifier RV provides the subsequent frequency divider FT with the constant input level required by it.
  • the output signal of the up-converter U2 now fits into the DBS channel grid of the 1st satellite intermediate frequency range, so that it can be fully occupied with 40 channels and can therefore be optimally used in a simple manner.
  • the signal is raised to a level suitable for feeding into the distribution network; in the subsequent third (output) filter F3, interfering secondary emissions (oscillator frequency, image frequency and mixed products) are also suppressed.

Abstract

In satellite receiving systems for receiving communication satellites or communication satellites and DBS satellites in the standardised first satellite intermediate frequency band, the DBS channel pattern cannot be filled with the 40 channels provided for it due to the greater bandwidth in the communication satellite signals. To create optimum utilisation of this intermediate-frequency band, the invention provides for each transmission channel a converter unit (UE1 to UE5), which in each case consists of a frequency divider (FT) by means of which the channel bandwidth of the communication satellite signals is halved, and an up-converter (U2) converting the respective transmission channel from the lower frequency position in a free channel in the DBS channel pattern of the first satellite intermediate-frequency band, following each frequency divider (FT). <IMAGE>

Description

Die Erfindung geht aus von einer Satelliten-Empfangsanlage gemäß dem Oberbegriff des Anspruches 1, wobei derzeit nur TV-Kanäle betroffen sind, weil FM-Tonrundfunkkanäle noch nicht über eigene Transponder von Satelliten abgestrahlt werden.
Der 1. Satelliten-Zwischenfrequenzbereich (0,95 bis 1,75 GHz) bietet für die Signalübertragung eine Bandbreite von 800 MHz. In diesem Band können jeweils 20 FM-TV-Kanäle mit einer Bandbreite von je 27 MHz (Frequenzhub 13,5 MHz/V) für jede der beiden Polarisationen (links- und rechtsdrehend zirkular), insgesamt also 40 DBS-Kanäle übertragen werden, wobei der Kanalabstand 19,18 MHz beträgt. Da alle geradzahli­gen Kanäle der linksdrehend zirkularen Polarisation zugeordnet sind und alle ungeradzahligen Kanäle der rechtsdrehend zirkularen Polari­sation, ergibt sich für jede Polarisation ein DBS-Kanalraster von 2 x 19,18 = 38,36 MHz.The invention is based on a satellite reception system according to the preamble of claim 1, wherein currently only TV channels are affected because FM audio broadcast channels are not yet emitted by satellites via their own transponders.
The 1st satellite intermediate frequency range (0.95 to 1.75 GHz) offers a bandwidth of 800 MHz for signal transmission. In this band, 20 FM-TV channels with a bandwidth of 27 MHz each (frequency swing 13.5 MHz / V) can be transmitted for each of the two polarizations (left and right circular), a total of 40 DBS channels, whereby the channel spacing is 19.18 MHz. Since all even-numbered channels are assigned to the left-handed circular polarization and all odd-numbered channels to the right-handed circular polarization, a DBS channel grid of 2 x 19.18 = 38.36 MHz results for each polarization.

Die DBS-Satelliten (z.B. TV-Sat.., TDF..) belegen eine Kanalbandbrei­te von 27 MHz, womit das beschriebene Kanalraster des 1. Satelliten-­Zwischenfrequenzbereiches optimal ausfüllbar ist. Die Kanäle der Kommunikations-Satelliten (Eutel-Sat.., Intel-Sat..) weisen dagegen eine Kanalbandbreite von 36 MHz auf, so daß bei deren (Mit-) Übertra­gung im 1. Satelliten-Zwischenfrequenzbereich entsprechend ihrer An­zahl im Einzelfall erheblich weniger als die genannten 40 Kanäle Platz haben.The DBS satellites (e.g. TV-Sat .., TDF ..) occupy a channel bandwidth of 27 MHz, which means that the channel grid described for the 1st satellite intermediate frequency range can be optimally filled. The channels of the communication satellites (Eutel-Sat .., Intel-Sat ..), on the other hand, have a channel bandwidth of 36 MHz, so that when they are (co-) transmitted in the 1st satellite intermediate frequency range, depending on their number, considerably less in individual cases than the 40 channels mentioned have space.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Satelliten-­ Empfangsanlage der im Oberbegriff des Anspruches 1 angegebenen Art derart weiterzubilden, daß auch bei Übertragung von Kommunikations­satelliten-Kanälen - sei es ausschließlich oder zusammen mit DBS-­Kanälen - im 1. Satelliten-Zwischenfrequenzbereich eine optimale Ka­nalbelegung möglich ist.The invention is therefore based on the object of To further develop the receiving system of the type specified in the preamble of claim 1 such that an optimal channel assignment is possible in the 1st satellite intermediate frequency range even when transmitting communication satellite channels - whether exclusively or together with DBS channels.

Diese Aufgabe ist erfindungsgemäß durch die im kennzeichnenden Teil des Anspruches 1 aufgeführten Merkmale gelöst. Dabei ist dem zweckmä­ßigerweise in Digitaltechnik ausgeführten Frequenzteiler ein Filter vorgeschaltet, das den jeweiligen Kanal selektiert und das Breitband­rauschen unterdrückt.
Durch die erfindungsgemäße Frequenzhubreduktion durch Frequenzteilung ist auf einfache Weise eine vollständige Belegung des DBS-Kanalra­sters im 1. Satelliten-Zwischenfrequenzbereich auch bei Übertragung von FM-Kanälen mit im Vergleich zu DBS-Kanälen größerer Bandbreite ermöglicht. Die Erfindung ist daher selbstverständlich nicht be­schränkt auf den Empfang von Signalen der derzeit abstrahlenden Kom­munikationssatelliten (gegebenenfalls zusammen mit solchen von DBS-­Satelliten), sondern umfaßt auch - zukünftig eventuell ausgestrahlte - FM-Signale, deren Kanalbandbreite wenigstens in etwa ein ganzzahli­ges Vielfaches (n) der Rasterkanalbandbreite im 1. Satelliten-Zwi­schenfrequenzbereich beträgt, wobei der digitale Frequenzteiler dann den Teilungsfaktor n aufweist.This object is achieved by the features listed in the characterizing part of claim 1. A filter, which selects the respective channel and suppresses the broadband noise, is connected upstream of the frequency divider, which is expediently implemented in digital technology.
Through the frequency deviation reduction by frequency division according to the invention, complete occupancy of the DBS channel grid in the 1st satellite intermediate frequency range is made possible in a simple manner even when FM channels are transmitted with a wider bandwidth than DBS channels. The invention is therefore of course not limited to the reception of signals from the currently radiating communication satellites (possibly together with those from DBS satellites), but also includes - in the future possibly transmitted - FM signals whose channel bandwidth is at least approximately an integer multiple (s). of the raster channel bandwidth in the 1st satellite intermediate frequency range, the digital frequency divider then having the division factor n.

Bei einer Ausgestaltung der erfindungsgemäßen Satelliten-Empfangsan­lage nach Anspruch 2 ist der Vorteil erreicht, daß sowohl das erwähn­te Eingangsfilter, als auch ein dem Frequenzteiler zur Unterdrückung der von diesem erzeugten Oberwellen nachgeschaltetes Filter nicht durchstimmbar sein muß und daher einfach und kostengünstig herstell­bar ist. Außerdem sind bei tieferen Frequenzen bessere Filterselekti­onseigenschaften realisierbar.In one embodiment of the satellite receiving system according to the invention, the advantage is achieved that both the input filter mentioned and a filter connected downstream of the frequency divider for suppressing the harmonics generated by the latter do not have to be tunable and are therefore simple and inexpensive to produce. In addition, better filter selection properties can be achieved at lower frequencies.

Die Erfindung wird nachstehend in den Figuren beispielsweise näher erläutert. Dabei zeigt Figur 1 den Prinzipaufbau einer solchen Sa­telliten-Empfangsanlage und Figur 2 das Blockschaltbild einer darin enthaltenen Umsetzereinheit.The invention is illustrated in the figures below, for example explained. 1 shows the basic structure of such a satellite reception system and FIG. 2 shows the block diagram of a converter unit contained therein.

In einer ersten Satelliten-Empfangsantenne SA1 werden DBS-Signale empfangen, in einer integrierten "Outdoor-Unit" OU1 in Kanäle des DBS-Kanalrasters im 1. Satelliten-Zwischenfrequenzbereich umgesetzt und einem ersten Verteiler V1 zugeleitet.
Mit einer zweiten Satelliten-Empfangsantenne SA2 werden Kanäle eines Kommunikationssatelliten (z.B. ECS 1) empfangen, mittels einer Out­door-Unit OU2 in freie Bereiche des 1. Satelliten-Zwischenfrequenz­bereichs umgesetzt und einem zweiten Verteiler V2 zugeführt. Diesem ist für jeden von fünf Nutzkanälen eine Umsetzereinheit UE1 bis UE5 nachgeschaltet, in denen die Kanäle jeweils in eine tiefere Frequenz­lage umgesetzt, durch den Faktor 2 geteilt und in einen freien Kanal im Kanalraster des 1. Satelliten-Zwischenfrequenzbereichs aufwärts umgesetzt werden. Die Ausgänge der Umsetzereinheiten UE1 bis UE5 sind über einen dritten Verteiler V3 zusammengeschaltet und dem ersten Verteiler V1 zugeführt, dessen Ausgangsleitung L die Signale in einer nachfolgenden Gemeinschafts- oder Kabelanlage verteilt.DBS signals are received in a first satellite receiving antenna SA1, converted into channels of the DBS channel grid in the first satellite intermediate frequency range in an integrated "outdoor unit" OU1 and fed to a first distributor V1.
Channels of a communication satellite (eg ECS 1) are received with a second satellite receiving antenna SA2, converted into free areas of the 1st satellite intermediate frequency range by means of an outdoor unit OU2 and fed to a second distributor V2. This is followed by a converter unit UE1 to UE5 for each of five user channels, in which the channels are each converted to a lower frequency range, divided by the factor 2 and converted into a free channel in the channel grid of the 1st satellite intermediate frequency range. The outputs of the converter units UE1 to UE5 are interconnected via a third distributor V3 and fed to the first distributor V1, whose output line L distributes the signals in a subsequent communal or cable system.

Jede Umsetzereinheit UE1 bis UE5 besteht, vom Eingang E zum Ausgang A aufeinanderfolgend, aus einem, einen durchstimmbaren Oszillator O1 und einen Mischer M1 aufweisenden Abwärtsumsetzer U1, einem fest ab­gestimmten ersten Filter F1, einem Regelverstärker RV, einem digita­len Frequenzteiler FT, einem fest abgestimmten zweiten Filter F2, ei­nem einen durchstimmbaren Oszillator O2 und einen Mischer M2 aufwei­senden Aufwärtsumsetzer U2, einem Nachverstärker NV und einem ab­stimmbaren Filter F3.
Ein in der Outdoor Unit OU2 in den 1. Satelliten-Zwischenfrequenz­bereich umgesetzter Kanal (z.B. Kanal "Italien" vom Transponder 1 des ECS1, Mittenfrequenz fm 11,007667 GHz / 1,007667 GHz) wird im Ab­wärtsumsetzer U1 in eine zweite Zwischenfrequenzlage (fm = 480 MHz, Hub = 25 MHz/V) umgesetzt. Im nachfolgenden ersten (Eingangs-) Filter F1 (480 MHz) wird dieser Kanal hochselektiv ausgefiltert und das Breitbandrauschen unter einen nicht störenden Wert gesenkt. Die Band­breite entspricht dem Frequenzhub des genannten Kanals von 36 MHz. Der Regelverstärker RV stellt dem nachfolgenden Frequenzteiler FT den von diesem benötigten konstanten Eingangspegel zur Verfügung. Im Fre­quenzteiler FT wird die Frequenz des Kanals und damit auch dessen Frequenzhub durch den Faktor 2 geteilt (fm = 240 MHz, Hub = 12,5 MHz/V), so daß die Bandbreite jetzt anstatt 36 MHz nur noch 18 MHz beträgt.
Dieses Signal wird in einem zweiten Filter F2 (240 MHz) von durch den digitalen Frequenzteiler FT erzeugten Oberwellen befreit und an­schließend im Aufwärtsumsetzer U2 in einen freien Kanal des 1. Sa­telliten-Zwischenfrequenzbereiches (z.B. Kanal 3, fm =1,01584 GHz) umgesetzt. Das Ausgangssignal des Aufwärtsumsetzers U2 paßt durch die beschriebene Bandbreitenreduktion nunmehr in das DBS-Kanalraster des 1. Satelliten-Zwischenfrequenzbereichs, so daß dieser voll mit 40 Ka­nälen belegbar und damit auf einfache Weise optimal nutzbar ist. Im Nachverstärker NV wird das Signal noch auf einen für die Einspei­sung in das Verteilnetz passenden Pegel angehoben; im nachfolgenden dritten (Ausgangs-) Filter F3 werden zudem noch störende Nebenaussen­dungen (Oszillatorfrequenz, Spiegelfrequenz und Mischprodukte) unterdrückt.Each converter unit UE1 to UE5 consists, in succession from input E to output A, of a down-converter U1 having a tunable oscillator O1 and a mixer M1, a permanently tuned first filter F1, a control amplifier RV, a digital frequency divider FT, and a permanently tuned second Filter F2, a step-up converter U2 having a tunable oscillator O2 and a mixer M2, a post-amplifier NV and a tunable filter F3.
A channel converted into the 1st satellite intermediate frequency range in the outdoor unit OU2 (eg channel "Italy" from transponder 1 of the ECS1, center frequency f m 11.007667 GHz / 1.007667 GHz) is converted to a second intermediate frequency position in the down converter U1 (f m = 480 MHz, hub = 25 MHz / V) implemented. In the following first (input) filter F1 (480 MHz) this channel is filtered out very selectively and the broadband noise is reduced below a non-disturbing value. The bandwidth corresponds to the frequency swing of the mentioned channel of 36 MHz. The control amplifier RV provides the subsequent frequency divider FT with the constant input level required by it. In the frequency divider FT, the frequency of the channel and thus also its frequency deviation is divided by a factor of 2 (f m = 240 MHz, deviation = 12.5 MHz / V), so that the bandwidth is now only 18 MHz instead of 36 MHz.
This signal is freed from harmonics generated by the digital frequency divider FT in a second filter F2 (240 MHz) and then converted in the up-converter U2 into a free channel of the 1st satellite intermediate frequency range (eg channel 3, f m = 1.01584 GHz) . Due to the described bandwidth reduction, the output signal of the up-converter U2 now fits into the DBS channel grid of the 1st satellite intermediate frequency range, so that it can be fully occupied with 40 channels and can therefore be optimally used in a simple manner. In the post-amplifier NV, the signal is raised to a level suitable for feeding into the distribution network; in the subsequent third (output) filter F3, interfering secondary emissions (oscillator frequency, image frequency and mixed products) are also suppressed.

Claims (2)

1. Satelliten-Empfangsanlage zum Empfang von über wenigstens zwei Kommunikationssatelliten oder mindestens je einen DBS- und einen Kommunikationssatelliten abgestrahlten FM-modulierten Signalen, die im genormten 1. Satelliten-Zwischenfrequenzbereich (0,95 bis 1,75 GHz) übertragen und gegebenenfalls zusammen mit terrestri­schen TV- und/oder RF-Kanälen in Gemeinschaftsantennen- oder Ka­belanlagen verteilt werden,
gekennzeichnet durch eine für jeden Übertragungskanal vorgesehene Umsetzereinheit UE1 bis UE5, die jeweils aus einem Frequenzteiler (FT), mit dem die Kanalbandbreite der Kommunikationssatelliten-­Signale halbiert wird, und einem jedem Frequenzteiler (FT) nachgeschalteten, den jeweiligen Übertragungskanal aus der tief­eren Frequenzlage in einen freien Kanal im DBS-Kanalraster des 1. Satelliten-Zwischenfrequenzbereichs umsetzenden Aufwärtsumsetzer (U2) besteht.1. Satellite receiving system for receiving FM-modulated signals emitted via at least two communication satellites or at least one DBS and one communication satellite each, which transmit in the standardized 1st satellite intermediate frequency range (0.95 to 1.75 GHz) and, if appropriate, together with terrestrial TV and / or RF channels are distributed in common antenna or cable systems,
characterized by a converter unit UE1 to UE5 provided for each transmission channel, each of which consists of a frequency divider (FT), with which the channel bandwidth of the communication satellite signals is halved, and a frequency divider (FT) downstream of the respective transmission channel from the lower frequency position into one free channel in the DBS channel grid of the 1st satellite intermediate frequency range converting up converter (U2) exists. 2. Satelliten-Empfangsanlage nach Anspruch 1, dadurch gekennzeichnet, daß jedem Frequenzteiler (FT) ein Abwärtsumsetzer (U1) vorgeschal­tet ist, der den jeweiligen Übertragungskanal aus dem 1. Satelli­ten-Zwischenfrequenzbereich in eine tiefere Frequenzlage umsetzt.2. Satellite receiving system according to claim 1, characterized in that each frequency divider (FT) has a down converter (U1) connected upstream, which converts the respective transmission channel from the 1st satellite intermediate frequency range into a lower frequency range.
EP19890112651 1988-08-10 1989-07-11 Satellite receipt installation Withdrawn EP0405004A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3827105 1988-08-10
DE19883827105 DE3827105A1 (en) 1988-08-10 1988-08-10 SATELLITE RECEIVER

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EP0405004A2 true EP0405004A2 (en) 1991-01-02
EP0405004A3 EP0405004A3 (en) 1991-07-31

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DE4117208A1 (en) * 1991-05-06 1992-11-19 Teleka Gmbh Multichannel reception appts. for satellite TV - has one output channel of both polarisation planes supplied to high pass filter for frequency conversion

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509198A (en) * 1981-10-19 1985-04-02 Dx Antenna Company, Limited Satellite broadcast signal receiving system

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Publication number Priority date Publication date Assignee Title
DE3226980A1 (en) * 1982-07-19 1984-01-19 Siemens AG, 1000 Berlin und 8000 München Receiving arrangement for terrestrial television and satellite television and/or broadcasting

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4509198A (en) * 1981-10-19 1985-04-02 Dx Antenna Company, Limited Satellite broadcast signal receiving system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOINT SESSIONS (BROADCAST AND TV) 15TH INTERNATIONAL TV SYMPOSIUM, Montreux, 11. - 17. Juni 1987, Seiten 89-130; H. SCHL\GL: "Head-end components for satellite reception in individual and CATV/MATV systems" *

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EP0405004A3 (en) 1991-07-31
DE3827105C2 (en) 1990-07-26
DE3827105A1 (en) 1990-02-15

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