JP2004032203A - Satellite signal receiving/transmitting system, up converter and down converter - Google Patents

Satellite signal receiving/transmitting system, up converter and down converter Download PDF

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JP2004032203A
JP2004032203A JP2002183445A JP2002183445A JP2004032203A JP 2004032203 A JP2004032203 A JP 2004032203A JP 2002183445 A JP2002183445 A JP 2002183445A JP 2002183445 A JP2002183445 A JP 2002183445A JP 2004032203 A JP2004032203 A JP 2004032203A
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satellite
intermediate frequency
signal
frequency signal
receiving
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JP3949011B2 (en
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Hiroshi Matsubara
松原　寛至
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Maspro Denkoh Corp
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Maspro Denkoh Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To transmit a plurality of satellite intermediate frequency signals to each terminal in a single transmission line. <P>SOLUTION: The satellite signal receiving/transmitting system comprises a first satellite receiving antenna outputting the intermediate frequency signal of a first satellite, a second satellite receiving antenna outputting a first intermediate frequency signal of a second satellite and the intermediate frequency signal of a third satellite, a first frequency converter for converting the first intermediate frequency signal of the second satellite into a second intermediate frequency signal of the second satellite, and a mixer for mixing the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite and the second intermediate frequency signal of the second satellite and transmitting them over a single transmission line to the terminal. The terminal comprises a second demultiplexer for outputting the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite and the second intermediate frequency signal of the second satellite selectively, and a second frequency converter for converting the second intermediate frequency signal of the second satellite, outputted from the second demultiplexer into the original first intermediate frequency signal of the second satellite. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は，放送衛星（以下ＢＳという。）や通信衛星（以下ＣＳという。）からの衛星信号を受信して，複数のテレビジョン受信機に供給する衛星信号受信伝送システムと，このシステムで使用するアップコンバータ及びダウンコンバータに関する。
【０００２】
【従来の技術】
衛星から送出されるＢＳ信号及びＣＳ信号の形態及び周波数帯域は，第３衛星信号としてのＢＳ信号は１１．７ＧＨｚ〜１２．２ＧＨｚの右旋円偏波，第１衛星信号としてのＣＳ信号は１２．２５ＧＨｚ〜１２．７３ＧＨｚの垂直偏波及び１２．２７ＧＨｚ〜１２．７５ＧＨｚの水平偏波となっている。従来，ＢＳ信号とＣＳ信号は双方の衛星が離れていることもあり，ＢＳアンテナとＣＳアンテナとにより別々に受信し，それぞれ独立して複数のケーブルで受信端となる各家庭等に伝送されるか，チューナーによりＣＳ垂直偏波とＣＳ水平偏波とを切換えて受信する場合は，混合器を用いてＢＳ信号とＣＳ信号を混合することで，１本のケーブルで端末端子に伝送される。
【０００３】
【発明が解決しようとする課題】
しかし，近年打ち上げられた第２の通信衛星としての東経１１０°通信衛星（以下１１０°ＣＳという。）信号は，１２．２５ＧＨｚ〜１２．７２９ＧＨｚの左旋円偏波及び，１２．２７１ＧＨｚ〜１２．７５ＧＨｚの右旋円偏波となっており，前記第１の衛星信号と略同一の周波数を使用しているので，各衛星信号をそれぞれ受信しようとすると，伝送線路の本数が増加する。
更に，既に伝送線路が配線されている場合，伝送線路を増やすのは困難であるし，増やせたとしても建造物等の壁面に露出して配線する必要があり，美観の点においても問題である。
【０００４】
そこで，本発明はこうした問題に鑑み，各衛星信号（詳しくは中間周波信号）を１本の伝送線路で各端末端子まで伝送できる衛星信号受信伝送システムを提供することを目的とする。
他の目的は，設置コストの低い衛星信号受信伝送システムを提供することである。
他の目的は，配線数が少なく，美観に優れた衛星信号受信伝送システムを提供することである。
他の目的は，追加する装置の数・種類が少なくて済む衛星信号受信伝送システムを提供することである。
他の目的は，衛星が追加されても既存の衛星信号受信伝送システムに容易に追加できる衛星信号受信伝送システムを提供することである。
他の目的は，狭い室内においても設置が容易な衛星信号受信伝送システムを提供することである。
他の目的は，Ｃ／Ｎを劣化させずに良好な画像を提供することができる衛星信号受信伝送システムを提供することである。
他の目的は，伝送線路の周波数利用効率を上げることができる衛星信号受信伝送システムを提供することである。
他の目的は，各衛星中間周波信号を１本の伝送線路で各端末端子まで伝送するためのアップコンバータを提供することである。
他の目的は，１本の伝送線路で各端末端子まで伝送された混合信号から，元の衛星中間周波信号に変換するダウンコンバータを提供することである。
他の目的は，電源供給のための配線が不要なアップコンバータを提供することである。
他の目的は，電源供給のための配線が不要なダウンコンバータを提供することである。
【０００５】
【課題を解決するための手段】
上記課題を解決するために，請求項１の発明は，衛星信号受信伝送システムにおいて，
第１衛星の信号を受信して，少なくとも一部の周波数が重複する，異なる偏波の組からなる中間周波信号を切換えて出力する第１の衛星受信アンテナと，
第２衛星の信号と第３衛星の信号を受信して，前記第１衛星の中間周波信号の周波数と少なくとも一部が重複する第２衛星の第１中間周波信号及び，前記第１衛星の中間周波信号の周波数とは重複しない第３衛星の中間周波信号を出力する第２の衛星受信アンテナと，
前記第２の衛星受信アンテナが受信した第２衛星の第１中間周波信号と第３衛星の中間周波信号を分波して出力する第１の分波器と，
前記第２衛星の第１中間周波信号を，前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が異なる第２衛星の第２中間周波信号に変換するための第１の周波数変換器と，
前記第３衛星の中間周波信号と第２衛星の第２中間周波信号を混合するための第１の混合器と，
前記第１の混合器で混合された混合信号と第１衛星の中間周波信号を混合するための第２の混合器を備え，
前記第２の混合器から出力される前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号を，１本の伝送線路で端末端子まで伝送すると共に，
端末端子には前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号とを各々分波して出力する第２の分波器を備え，
前記第２の分波器から出力された第２衛星の第２中間周波信号を，元の第２衛星の第１中間周波信号に戻すための第２の周波数変換器を備えるよう構成される。
【０００６】
請求項２の発明は，前記第２の混合器で，前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号と周波数が重複することがない信号を混合して，端末端子まで伝送するよう構成される。
【０００７】
請求項３の発明は，前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号と周波数が重複しない第４衛星信号を受信するための第３の衛星受信アンテナと，
前記第４衛星信号と，前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号を混合するための第３の混合器を，前記第１の混合器と第２の混合器の間に備えるよう構成される。
【０００８】
請求項４の発明は，前記請求項１乃至請求項３のいずれか記載の衛星信号受信伝送システムにおいて，
前記第１の分波器と，第１の周波数変換器と，第１の混合器とを一体的に形成するよう構成される。
【０００９】
請求項５の発明は，前記請求項１乃至請求項４のいずれか記載の衛星信号受信伝送システムにおいて，
前記第２の分波器と，前記第２の周波数変換器とを一体的に形成するよう構成される。
【００１０】
請求項６の発明は，前記第２の混合器に，各信号を所定レベルまで増幅する増幅器を内蔵するよう構成される。
【００１１】
請求項７の発明は，前記第１衛星が通信衛星であり，
前記第２衛星が東経１１０度通信衛星であり，
前記第３衛星が放送衛星であり，
前記第４衛星が衛星ディジタル音声放送であるよう構成される。
【００１２】
請求項８の発明は，前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するアップコンバータであって，
前記第２衛星の第１中間周波信号を入力するための入力端子と，
前記第２衛星の第２中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子との間には，前記第２衛星の第１中間周波信号を前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が重複することがなく，かつ，周波数が高い第２中間周波信号に変換するための第１の周波数変換回路を備えるよう構成される。
【００１３】
請求項９の発明は，前記請求項８に記載のアップコンバータであって，
前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第１の周波数変換回路の動作電源を供給するよう構成される。
【００１４】
請求項１０の発明は，前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するダウンコンバータであって，
前記第２衛星の第２中間周波信号を入力するための入力端子と，
前記第２衛星の第１中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子の間には，前記第２衛星の第２中間周波信号を元の第２衛星の第１中間周波信号に変換するための第２の周波数変換回路を備えるよう構成される。
【００１５】
請求項１１の発明は，前記請求項１０に記載のダウンコンバータであって，
前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第２の周波数変換回路の動作電源を供給するよう構成される。
【００１６】
【発明の実施の形態】
以下，本発明を具体化した実施形態を図面に基づいて詳細に説明する。
図１は，衛星信号受信伝送システムの構成を示すブロック図であり，
１はＶＨＦ帯の地上波テレビジョン放送信号を受信するためのＶＨＦ受信アンテナ，
２はＵＨＦ帯の地上波テレビジョン放送信号を受信するためのＵＨＦ受信アンテナ，
３は第３衛星としてのＢＳ及び，第２衛星としての１１０°ＣＳを受信し，１〜２ＧＨｚ帯の中間周波信号に変換するコンバータ３ａを備えた第２の衛星受信アンテナ，
４は第４衛星としての衛星ディジタル音声放送信号を受信する第３の衛星受信アンテナ，
５は第１衛星としてのＣＳを受信し，１〜２ＧＨｚ帯の中間周波信号に変換するコンバータ５ａを備えた第１の衛星受信アンテナである。
そして１０は，ＢＳ中間周波信号と１１０°ＣＳ第１中間周波信号を分離して出力するための第１の分波器，
１１は１１０°ＣＳ第１中間周波信号を前記ＣＳ中間周波信号及びＢＳ中間周波信号と周波数が異なる１１０°ＣＳ第２中間周波信号に変換するアップコンバータ，
１２はＢＳ中間周波信号と１１０°ＣＳ第２中間周波信号を混合するための第１の混合器，
１３は前記第１の混合器１２から出力された混合信号（詳しくはＢＳ中間周波信号及び１１０°ＣＳ第２中間周波信号）と前記衛星ディジタル音声放送信号を混合するための第３の混合器，
１４は前記ＶＨＦ帯地上波テレビジョン放送信号と前記ＵＨＦ帯地上波テレビジョン放送信号とＢＳ中間周波信号と１１０°ＣＳ第２中間周波信号と衛星ディジタル音声放送信号とＣＳ中間周波信号をそれぞれ所定レベルまで増幅してから混合して，伝送線路Ｌに出力する混合増幅器である。
尚，アップコンバータ１１が本発明の第１の周波数変換器に相当し，混合増幅器１４が第２の混合器に相当する。
前記１〜１４までの各機器が，一般に屋外の各電波が受信できる場所に設置されている。
【００１７】
次に，一般に屋内に設置される機器について説明する。
１５は分配器，１６は端末端子であり，分配器１５の各分配端子に各々接続されている。
１７は端末端子に出力された各衛星信号及び地上波テレビジョン信号を，それぞれ分離して出力するための第２の分波器である。
１８は前記１１０°ＣＳ第２中間周波信号を元の第２の１１０°ＣＳ第１中間周波信号に再変換するためのダウンコンバータである。
ダウンコンバータ１８が本発明の第２の周波数変換器に相当する。
１９は１１０°ＣＳ受信機，２０はＣＳ受信機，２２は衛星ディジタル音声放送受信機，２３はテレビジョン受信機である。
【００１８】
次に，アップコンバータ１１とダウンコンバータ１８について，図２，図３を用いて詳しく説明する。
図２は，アップコンバータ１１の詳細な構成を示すブロック図であり，１１ａは入力端子，１１ｂは出力端子，１１ｃは周波数変換回路，１１ｄは電源フィルタ，１１ｅは電源回路である。尚，周波数変換回路１１ｃが本発明の第１の周波数変換回路に相当する。
アップコンバータは導電性を有し，シールド効果があって，且つ，防水性が良好なケース内に収納されており，アップコンバータの動作用電源は，前記混合増幅器１４から前記１１０°ＣＳ第２中間周波信号伝送用の伝送線路に重畳して供給されるようになっている。
【００１９】
図３は，ダウンコンバータ１８の詳細な構成を示すブロック図であり，１８ａは入力端子，１８ｂは出力端子，１８ｃは周波数変換回路，１８ｄは電源フィルタ，１８ｅは電源回路である。尚，周波数変換回路１８ｃが本発明の第２の周波数変換回路に相当する。
ダウンコンバータは導電性を有し，シールド効果のあるケース内に収納されており，ダウンコンバータの動作用電源は前記１１０°ＣＳ受信機１９から１１０°ＣＳ第１中間周波信号伝送用の伝送線路に重畳して供給されるようになっている。
【００２０】
次に，混合増幅器１４について，図４を用いて詳しく説明する。
１４ａはＶＨＦ帯の地上波テレビジョン放送信号を入力するための入力端子，１４ｂはＵＨＦ帯の地上波テレビジョン放送信号を入力するための入力端子，
１４ｃはＢＳ中間周波信号及び１１０°ＣＳ第２中間周波信号及び衛星ディジタル音声放送信号を入力するための入力端子，
１４ｄはＣＳ中間周波信号を入力するための入力端子，
１４ｅはＡＣ１００Ｖを入力するための入力端子，
１４ｆは各衛星放送信号及び地上波テレビジョン信号を出力する出力端子である。
２４ａ〜２４ｄは各信号を所定レベルまで増幅するための増幅器，
１４ｇ〜１４ｉは電源フィルタ，
１４ｊは電源回路である。
１４ｋは前記ＶＨＦ帯の地上波テレビジョン放送信号と，ＵＨＦ帯の地上波テレビジョン放送信号を混合するための混合器，
１４ｌはＢＳ中間周波信号と１１０°ＣＳ第２中間周波信号・衛星ディジタル音声放送信号を分波して出力するための分波器，
１４ｍは１１０°ＣＳ第２中間周波信号・衛星ディジタル音声放送信号とＣＳ中間周波信号を混合するための混合器，
１４ｎは前記混合器１４ｍで混合された混合信号（詳しくは１１０°ＣＳ第２中間周波信号，衛星ディジタル音声放送信号，ＣＳ中間周波信号）とＢＳ中間周波信号を混合するための混合器であり，
１４ｏは混合器１４ｎで混合された混合信号（詳しくはＢＳ中間周波信号，１１０°ＣＳ第２中間周波信号，衛星ディジタル音声放送信号，ＣＳ中間周波信号）と，混合器１４ｋで混合されたＶＨＦ・ＵＨＦ帯の地上波テレビジョン放送を混合して出力するための混合器である。
尚，混合増幅器１４は，導電性を有し，シールド効果があって，かつ，防水性が良好なケースに収納されている。また，混合増幅器１４は，各アンテナの至近に設けられたり，電源が容易に確保できる軒下などに設置される。
【００２１】
次に，第２の分波器１７について，図５を用いて詳しく説明する。
１７ａは入力端子，１７ｂは衛星ディジタル音声放送信号出力端子，１７ｃは１１０°ＣＳ第２中間周波信号出力端子，１７ｄはＣＳ中間周波信号出力端子，１７ｅはＢＳ中間周波信号出力端子，１７ｆはＶＨＦ帯及びＵＨＦ帯の地上波テレビジョン放送信号出力端子である。１７ｇ，１７ｈは電源フィルタである。１７ｉは，入力端子に入力されたＢＳ中間周波信号，１１０°ＣＳ第２中間周波信号，衛星ディジタル音声放送信号，ＣＳ中間周波信号及びＶＨＦ・ＵＨＦ帯の地上波テレビジョン放送信号の中から，地上波ディジタル音声放送信号のみ抽出して出力するための分波器であり，１７ｊは，１７ｉで抽出された残りの信号から，１１０°ＣＳ第２中間周波信号のみ抽出して出力するための分波器であり，１７ｋは，１７ｊで抽出された残りの信号から，ＣＳ中間周波信号のみ抽出して出力するための分波器であり，１７ｌは，１７ｋで抽出された残りの信号から，ＢＳ中間周波信号とＶＨＦ・ＵＨＦ帯の地上波テレビジョン放送信号を分離して出力するための分波器である。
尚，第２の分波器１７は，導電性を有し，シールド効果のあるケースに収納されている。
【００２２】
次に，衛星信号受信伝送システムの動作について詳しく説明する。
第２の衛星受信アンテナ３で受信したＢＳ信号（第３衛星信号）及び１１０°ＣＳ信号（第２衛星信号）は，図６（Ａ）に示す通りコンバータ３ａで，前記ＢＳ信号は１０３２〜１４８９ＭＨｚのＢＳ中間周波信号に変換され，前記１１０°ＣＳ信号は１５９５ＭＨｚ〜２０７１ＭＨｚの１１０°ＣＳ第１中間周波信号に変換された後，第１の分波器１０に供給される。
第１の分波器１０に供給された両中間周波信号は，それぞれ分波して出力され，前記１１０°ＣＳ第１中間周波信号はアップコンバータ１１の周波数変換回路１１ｃで前記ＢＳ中間周波信号及び後述するＣＳ中間周波信号と周波数が重複することなく，かつ，高い周波数の１１０°ＣＳ第２中間周波信号に変換される。
本実施例では，１１０°ＣＳ第２中間周波信号として１１０°ＣＳ第１中間周波信号より５３１ＭＨｚ高い２１２６ＭＨｚ〜２６０２ＭＨｚを採用している。
一方，分波器１０で分波されたＢＳ中間周波信号と，前記アップコンバータ１１で周波数変換された１１０°ＣＳ第２中間周波信号は，前記混合器１２で混合され，混合器１２の出力端子には図６（Ｂ）に示す通り，ＢＳ中間周波信号と１１０°ＣＳ第２中間周波信号が出力される。
【００２３】
次に，混合器１３では更に第４衛星信号としての衛星ディジタル音声放送信号（２６３０ＭＨｚ〜２６５５ＭＨｚ）が混合され，混合増幅器１４の入力端子１４ｃに供給される。
また，混合増幅器１４の入力端子１４ｄには，第１の衛星受信アンテナ５で受信したＣＳ信号（第１衛星信号）はコンバータ５ａで１５７２ＭＨｚ〜２０７２ＭＨｚに変換されたＣＳ中間周波信号が供給される。
また，混合増幅器１４の入力端子１４ａ，１４ｂには，それぞれＶＨＦ受信アンテナ１，ＵＨＦ受信アンテナ２で各々受信したＶＨＦ帯・ＵＨＦ帯の地上波テレビジョン放送信号が供給されている。
【００２４】
混合増幅器１４の入力端子１４ａ，１４ｂに各々入力されたＶＨＦ帯・ＵＨＦ帯の地上波テレビジョン放送信号は，増幅器２４ａ，２４ｂで各々所定レベルまで増幅され，混合器１４ｋで混合され，混合器１４ｏに供給される。
また，入力端子１４ｃ，１４ｄに各々入力されたＢＳ中間周波信号と１１０°ＣＳ第２中間周波信号と衛星ディジタル音声放送信号の混合信号とＣＳ中間周波信号は，電源フィルタ１４ｇ，１４ｈを介して増幅器２４ｃ，２４ｄで所定レベルまで増幅された後，分波器１４ｌで分波された１１０°ＣＳ第２中間周波信号・衛星ディジタル音声放送信号と増幅器２４ｄで増幅されたＣＳ中間周波信号が混合器１４ｍで混合され，混合器１４ｍで混合された混合信号と分波器１４ｌで分波された他方のＢＳ中間周波信号が混合器１４ｎで混合され，混合器１４ｏに供給される。
【００２５】
そして，混合器１４ｏでは前記混合器１４ｋの混合信号（詳しくはＶＨＦ・ＵＨＦ帯の地上波テレビジョン放送信号）と前記混合器１４ｎの混合信号（詳しくはＢＳ中間周波信号，１１０°ＣＳ第２中間周波信号，衛星ディジタル音声放送信号，ＣＳ中間周波信号）が混合され，電源フィルタ１４ｉを介して出力端子１４ｆに供給される。
混合増幅器１４の出力端子１４ｆにおける周波数スペクトルを図６（Ｃ）に示す。
尚，増幅器２４ａ〜２４ｄの動作用電源は，商用電源ＡＣ１００Ｖを入力する入力端子１４ｅ及び，電源回路１４ｊを介して供給されている。また，第２衛星受信アンテナ３のコンバータ３ａ及びアップコンバータ１１及び衛星ディジタル音声放送受信アンテナ４を動作させるために，入力端子１４ｃに電源フィルタ１４ｇを介して動作電源（本実施例ではＤＣ１５Ｖ）を供給している。
【００２６】
尚，分波器１０，混合器１２，１３は，動作用電源が通過出来るように構成されている。また，後述するＣＳ受信機２０から出力される衛星切替信号（２０ｋＨｚ〜５０ｋＨｚ信号の有無）及び，コンバータ５ａの動作用電源兼偏波切換信号（ＤＣ１１Ｖ又はＤＣ１５Ｖ）が伝送線路Ｌを介して混合増幅器１４の出力端子１４ｆに供給される。
この衛星切換信号及び偏波切換信号を入力端子１４ｄに接続された第１の衛星受信アンテナ５（詳しくはコンバータ５ａ）に伝送するために電源フィルタ１４ｉ，１４ｈが設けられている。
【００２７】
次に，混合増幅器１４の出力端子１４ｆに出力された混合信号は，分配器１５で必要数に分配され，複数設けた端末端子１６ａ…まで伝送される。
端末端子１６まで伝送された混合信号は，第２の分波器１７の入力端子１７ａに入力され，電源フィルタ１７ｇを介して分波器１７ｉに入力され，混合信号の中から周波数が高い順に衛星ディジタル音声放送信号，１１０°ＣＳ第２中間周波信号，ＣＳ中間周波信号，ＢＳ中間周波信号，ＶＨＦ・ＵＨＦ帯の地上波テレビジョン放送信号がそれぞれ出力端子１７ｂ，１７ｃ，１７ｄ，１７ｅ，１７ｆに出力される。
また，電源フィルタ１７ｇ，１７ｈは，前記１４ｉ，１４ｈと同様にＣＳ受信機２０から出力される衛星切換信号，偏波切換信号を第１の衛星受信アンテナ５（詳しくはコンバータ５ａ）に伝送するために設けられている。
【００２８】
第２の分波器１７の出力端子１７ｂに出力された衛星ディジタル音声放送信号は，衛星ディジタル音声放送受信機２２で受信される。
また，出力端子１７ｃに出力された１１０°ＣＳ第２中間周波信号は，ダウンコンバータ１８の入力端子１８ａに入力され，周波数変換回路１８ｃで元の１１０°ＣＳ第１中間周波信号に変換した後，電源フィルタ１８ｄを介して，出力端子１８ｂに出力される。出力端子１８ｂに出力された１１０°ＣＳ第１中間周波信号は，１１０°ＣＳ受信機１９で受信され，映像・音声信号がテレビジョン受信機２３に供給され表示される。
ここで，ダウンコンバータ１８の入力端子１８ａ及び，出力端子１８ｂにおける周波数スペクトルを図６（Ｄ），（Ｅ）に示す。
尚，ダウンコンバータの動作電源は，前記１１０°ＣＳ受信機１９から信号伝送路を介して出力端子１８ｂに供給され，電源フィルタ１８ｄで分離出力され，電源回路１８ｅを介して周波数変換回路１８ｃに供給されるよう構成されている。
【００２９】
次に，出力端子１７ｄに出力されたＣＳ中間周波信号は，ＣＳ受信機２０で受信され，映像・音声信号がテレビジョン受像機に供給され表示される。
ここで，出力端子１７ｄにおける周波数スペクトルを図６（Ｆ）に示す。
また，使用者がＣＳ受信機２０を操作して受信チャンネルを変更すると，受信チャンネルに対応する衛星切換信号（２０ｋＨｚ〜５０ｋＨｚの信号の有無）及び動作用電源兼偏波切換信号（ＤＣ１１Ｖ／１５Ｖ）が生成され，信号伝送線路を介して出力端子１７ｄに供給され，前述した通り電源フィルタ１７ｈ，１７ｇ，端末端子１６，分配器１５，電源フィルタ１４ｉ，１４ｈを介してコンバータ５ａに伝送するように構成されている。
【００３０】
尚，本発明は上記実施の形態に限定されるものではなく，以下に例示するように本発明の趣旨を逸脱しない範囲で，適宜変更して実施することも可能である。また，本発明の実施形態と同様の構成要素については，同一符号を付与し，詳細な説明は省略する。
例えば，本発明ではアップコンバータ１１，分波器１０，混合器１２をそれぞれ別体で設けた説明をしたが，図７に示すように一体的に形成したアップコンバータ２１に変更してもよい。このようにすれば，機器の数を少なくすることができるので，設置工事が容易となると共に，メンテナンスが容易になるという効果も奏する。
次に，本発明では第２の分波器１７，ダウンコンバータ１８をそれぞれ別体で設けて説明したが，図８に示すように一体的に形成したダウンコンバータ２８に変更しても良い。このようにすれば，機器の数が少なく，配線も少なくなるので，設置工事が容易になると共に，美観が向上するという効果も奏する。
【００３１】
図８と図５の相違点は，分配器２８ｈと混合器２８ｇが設けられている点である。分波器１７ｌで分波されたＢＳ中間周波信号を分配器２８ｈで分配し，一方の分配端子は混合器２８ｇで１１０°ＣＳ第１中間周波信号と混合され，電源フィルタ１８ｄを介して出力端子２８ｃに出力している。このようにすれば，外部に分配器や混合器を用意することなくＢＳ内蔵の１１０°ＣＳ受信機が利用できるようになる。
また，本実施例ではＶＨＦ帯・ＵＨＦ帯の地上波テレビジョン放送受信用アンテナ１，２を設ける説明をしたが，これに代わって例えば７０ＭＨｚ〜７７０ＭＨｚのＣＡＴＶ信号に対応するように変更してもよい。この場合，混合増幅器１４をＣＡＴＶ信号に対応できるように一部変更する必要がある。
【００３２】
【発明の効果】
以上詳述したように，請求項１の発明によれば，衛星信号受信伝送システムにおいて，
第１衛星の信号を受信して，少なくとも一部の周波数が重複する，異なる偏波の組からなる中間周波信号を切換えて出力する第１の衛星受信アンテナと，
第２衛星の信号と第３衛星の信号を受信して，前記第１衛星の中間周波信号の周波数と少なくとも一部が重複する第２衛星の第１中間周波信号及び，前記第１衛星の中間周波信号の周波数とは重複しない第３衛星の中間周波信号を出力する第２の衛星受信アンテナと，
前記第２の衛星受信アンテナが受信した第２衛星の第１中間周波信号と第３衛星の中間周波信号を分波して出力する第１の分波器と，
前記第２衛星の第１中間周波信号を，前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が異なる第２衛星の第２中間周波信号に変換するための第１の周波数変換器と，
前記第３衛星の中間周波信号と第２衛星の第２中間周波信号を混合するための第１の混合器と，
前記第１の混合器で混合された混合信号と第１衛星の中間周波信号を混合するための第２の混合器を備え，
前記第２の混合器から出力される前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号を，１本の伝送線路で端末端子まで伝送すると共に，
端末端子には前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号とを各々分波して出力する第２の分波器を備え，
前記第２の分波器から出力された第２衛星の第２中間周波信号を，元の第２衛星の第１中間周波信号に戻すための第２の周波数変換器を備えているので，
各衛星信号（詳しくは中間周波信号）を１本の伝送線路で各端末端子まで伝送すると共に，配線数が少なく，美観に優れた衛星信号受信伝送システムを提供することができる。
【００３３】
請求項２の発明によれば，前記第２の混合器で，前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号と周波数が重複することがない信号を混合して，端末端子まで伝送するよう構成したので，
伝送線路の周波数利用効率を上げることができる衛星信号受信伝送システムを提供することができる。
【００３４】
請求項３の発明によれば，前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号と周波数が重複しない第４衛星信号を受信するための第３の衛星受信アンテナと，
前記第４衛星信号と，前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号を混合するための第３の混合器を，前記第１の混合器と第２の混合器の間に備えているので，
衛星が追加されても既存の衛星信号受信伝送システムに容易に追加できる衛星信号受信伝送システムを提供することができる。
【００３５】
請求項４の発明によれば，前記請求項１乃至請求項３のいずれか記載の衛星信号受信伝送システムにおいて，
前記第１の分波器と，第１の周波数変換器と，第１の混合器とを一体的に形成しているので，
追加する装置の数・種類が少なく，設置コストの低い衛星信号受信伝送システムを提供することができる。
【００３６】
請求項５の発明によれば，前記請求項１乃至請求項４のいずれか記載の衛星信号受信伝送システムにおいて，
前記第２の分波器と，前記第２の周波数変換器とを一体的に形成しているので，追加する装置の数・種類が少なく，設置コストの低いと共に，狭い室内においても設置が容易な衛星信号受信伝送システムを提供することができる。
【００３７】
請求項６の発明によれば，前記第２の混合器に，各信号を所定レベルまで増幅する増幅器を内蔵しているので，
Ｃ／Ｎを劣化させずに良好な画像を提供することができる衛星信号受信伝送システムを提供することができる。
【００３８】
請求項７の発明によれば，前記第１衛星が通信衛星であり，
前記第２衛星が東経１１０度通信衛星であり，
前記第３衛星が放送衛星であり，
前記第４衛星が衛星ディジタル音声放送であるので，
衛星が追加されても既存の衛星信号受信伝送システムに容易に追加できる衛星信号受信伝送システムを提供することができる。
【００３９】
請求項８の発明によれば，前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するアップコンバータであって，
前記第２衛星の第１中間周波信号を入力するための入力端子と，
前記第２衛星の第２中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子との間には，前記第２衛星の第１中間周波信号を前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が重複することがなく，かつ，周波数が高い第２中間周波信号に変換するための第１の周波数変換回路を備えているので，
各衛星中間周波信号を１本の伝送線路で各端末端子まで伝送するためのアップコンバータを提供することができる。
【００４０】
請求項９の発明によれば，前記請求項８に記載のアップコンバータであって，前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第１の周波数変換回路の動作電源を供給するように構成しているので，
電源供給のための配線が不要なアップコンバータを提供することができる。
【００４１】
請求項１０の発明によれば，前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するダウンコンバータであって，
前記第２衛星の第２中間周波信号を入力するための入力端子と，
前記第２衛星の第１中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子の間には，前記第２衛星の第２中間周波信号を元の第２衛星の第１中間周波信号に変換するための第２の周波数変換回路を備えているので，
１本の伝送線路で各端末端子まで伝送された混合信号から，元の衛星中間周波信号に変換するダウンコンバータを提供することができる。
【００４２】
請求項１１の発明によれば，前記請求項１０に記載のダウンコンバータであって，
前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第２の周波数変換回路の動作電源を供給するよう構成しているので，
電源供給のための配線が不要なダウンコンバータを提供することができる。
【図面の簡単な説明】
【図１】本発明の衛星信号受信伝送システムのブロック図である。
【図２】アップコンバータの構成を示すブロック図である。
【図３】ダウンコンバータの構成を示すブロック図である。
【図４】混合増幅器の構成を示すブロック図である。
【図５】第２の分波器の構成を示すブロック図である。
【図６】周波数スペクトルを示す説明図である。
（Ａ）コンバータ３ａの出力端子における周波数スペクトルである。
（Ｂ）第１の混合器出力端子における周波数スペクトルである。
（Ｃ）混合増幅器出力端子における周波数スペクトルである。
（Ｄ）第２の分波器の第２衛星の第２中間周波信号出力端子における周波数スペクトルである。
（Ｅ）ダウンコンバータの出力端子における周波数スペクトルである。
（Ｆ）第２の分波器の第１衛星の中間周波信号出力端子における周波数スペクトルである。
【図７】異なる実施形態のアップコンバータのブロック図である。
【図８】異なる実施形態のダウンコンバータのブロック図である。
【符号の説明】
１…ＶＨＦ受信アンテナ，２…ＵＨＦ受信アンテナ，３…第２の衛星受信アンテナ，４…第３の衛星受信アンテナ，５…第１の衛星受信アンテナ，１０…第１の分波器，１１…第１の周波数変換器，１２…第１の混合器，１３…第３の混合器，１４…混合増幅器，１５…分配器，１６…端末端子，１７…第２の分波器，１８…第２の周波数変換器，１９…１１０°ＣＳ受信機，２０…ＣＳ受信機，２１…第１の周波数変換器，２２…衛星ディジタル音声放送受信機，２３…テレビジョン受信機，２４…増幅器，２８…第２の周波数変換器。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a satellite signal receiving and transmitting system for receiving satellite signals from a broadcasting satellite (hereinafter, referred to as BS) or a communication satellite (hereinafter, referred to as CS) and supplying the signals to a plurality of television receivers. To an up converter and a down converter.
[0002]
[Prior art]
The form and frequency band of the BS signal and the CS signal transmitted from the satellite are as follows: the BS signal as the third satellite signal is a right-handed circularly polarized wave of 11.7 GHz to 12.2 GHz, and the CS signal as the first satellite signal is 12 It has vertical polarization of .25 GHz to 12.73 GHz and horizontal polarization of 12.27 GHz to 12.75 GHz. Conventionally, the BS signal and the CS signal are sometimes separated by both satellites, and are separately received by the BS antenna and the CS antenna, respectively, and independently transmitted to each home or the like as a receiving end by a plurality of cables. Alternatively, when receiving by switching the CS vertical polarization and the CS horizontal polarization by the tuner, the BS signal and the CS signal are mixed using a mixer, and transmitted to the terminal terminal by one cable.
[0003]
[Problems to be solved by the invention]
However, a 110 ° east longitude communication satellite (hereinafter referred to as 110 ° CS) signal as a second communication satellite launched in recent years has a left-handed circularly polarized wave of 12.25 GHz to 12.729 GHz and a frequency of 12.271 GHz to 12.75 GHz. , And uses substantially the same frequency as the first satellite signal. Therefore, if each satellite signal is to be received, the number of transmission lines increases.
Furthermore, if the transmission lines are already wired, it is difficult to increase the number of transmission lines, and even if the number of transmission lines can be increased, it is necessary to expose the wiring to the wall of a building or the like, which is also a problem in terms of aesthetics. .
[0004]
In view of these problems, an object of the present invention is to provide a satellite signal receiving and transmitting system capable of transmitting each satellite signal (specifically, an intermediate frequency signal) to each terminal terminal through one transmission line.
Another object is to provide a satellite signal receiving and transmitting system with low installation cost.
Another object is to provide a satellite signal receiving and transmitting system with a small number of wires and excellent appearance.
Another object of the present invention is to provide a satellite signal receiving and transmitting system in which the number and types of devices to be added are small.
Another object is to provide a satellite signal reception and transmission system that can be easily added to an existing satellite signal reception and transmission system even when a satellite is added.
Another object is to provide a satellite signal receiving and transmitting system that can be easily installed even in a small room.
Another object is to provide a satellite signal receiving and transmitting system capable of providing a good image without deteriorating C / N.
Another object is to provide a satellite signal receiving and transmitting system capable of increasing the frequency utilization efficiency of a transmission line.
Another object is to provide an upconverter for transmitting each satellite intermediate frequency signal to each terminal terminal through one transmission line.
Another object is to provide a downconverter for converting a mixed signal transmitted to each terminal terminal through one transmission line into an original satellite intermediate frequency signal.
Another object is to provide an upconverter that does not require wiring for power supply.
Another object is to provide a downconverter that does not require wiring for power supply.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 provides a satellite signal receiving and transmitting system,
A first satellite receiving antenna for receiving a signal from the first satellite and switching and outputting an intermediate frequency signal having a set of different polarizations at least partially overlapping in frequency;
Receiving a signal of the second satellite and a signal of the third satellite, and a first intermediate frequency signal of the second satellite at least partially overlapping the frequency of the intermediate frequency signal of the first satellite; A second satellite receiving antenna that outputs an intermediate frequency signal of a third satellite that does not overlap with the frequency of the frequency signal;
A first duplexer for splitting and outputting the first intermediate frequency signal of the second satellite and the intermediate frequency signal of the third satellite received by the second satellite receiving antenna;
A first frequency for converting the first intermediate frequency signal of the second satellite into a second intermediate frequency signal of a second satellite having a different frequency from the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite; A converter,
A first mixer for mixing the intermediate frequency signal of the third satellite and the second intermediate frequency signal of the second satellite;
A second mixer for mixing the mixed signal mixed by the first mixer with the intermediate frequency signal of the first satellite;
The intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite output from the second mixer are transmitted to a terminal through a single transmission line. ,
A terminal terminal is provided with a second duplexer that separates and outputs the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite, respectively.
A second frequency converter is provided for returning the second intermediate frequency signal of the second satellite output from the second duplexer to the original first intermediate frequency signal of the second satellite.
[0006]
According to a second aspect of the present invention, in the second mixer, the frequency of the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite do not overlap. Are mixed and transmitted to the terminal terminal.
[0007]
According to a third aspect of the present invention, a third satellite signal for receiving a fourth satellite signal whose frequency does not overlap with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite. A satellite receiving antenna,
A third mixer for mixing the fourth satellite signal with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite; Configured to provide between the vessel and the second mixer.
[0008]
According to a fourth aspect of the present invention, in the satellite signal receiving and transmitting system according to any one of the first to third aspects,
The first splitter, the first frequency converter, and the first mixer are configured to be integrally formed.
[0009]
According to a fifth aspect of the present invention, in the satellite signal receiving and transmitting system according to any one of the first to fourth aspects,
The second splitter and the second frequency converter are configured to be integrally formed.
[0010]
According to a sixth aspect of the present invention, an amplifier for amplifying each signal to a predetermined level is built in the second mixer.
[0011]
The invention according to claim 7 is that the first satellite is a communication satellite,
The second satellite is a 110-degree east longitude communication satellite,
The third satellite is a broadcast satellite,
The fourth satellite is configured to be a satellite digital audio broadcast.
[0012]
An eighth aspect of the present invention is an upconverter used in the satellite signal receiving and transmitting system according to any one of the first to seventh aspects,
An input terminal for inputting a first intermediate frequency signal of the second satellite,
An output terminal for outputting a second intermediate frequency signal of the second satellite;
The first intermediate frequency signal of the second satellite is not overlapped with the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite between the input terminal and the output terminal, and It is configured to include a first frequency conversion circuit for converting into a second intermediate frequency signal having a high frequency.
[0013]
A ninth aspect of the present invention is the upconverter according to the eighth aspect,
An operation power supply superimposed on a transmission line connected to the output terminal is extracted to supply an operation power supply for the first frequency conversion circuit.
[0014]
According to a tenth aspect of the present invention, there is provided a down converter used in the satellite signal receiving and transmitting system according to any one of the first to seventh aspects,
An input terminal for inputting a second intermediate frequency signal of the second satellite,
An output terminal for outputting a first intermediate frequency signal of the second satellite,
A second frequency conversion circuit is provided between the input terminal and the output terminal for converting a second intermediate frequency signal of the second satellite into an original first intermediate frequency signal of the second satellite. .
[0015]
The invention according to claim 11 is the downconverter according to claim 10, wherein
An operation power supply superimposed on a transmission line connected to the output terminal is extracted to supply an operation power supply for the second frequency conversion circuit.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a satellite signal receiving and transmitting system.
1 is a VHF receiving antenna for receiving a VHF terrestrial television broadcast signal,
2 is a UHF receiving antenna for receiving a UHF band terrestrial television broadcast signal,
Reference numeral 3 denotes a second satellite receiving antenna provided with a converter 3a that receives a BS as a third satellite and 110 ° CS as a second satellite and converts the BS into an intermediate frequency signal in a 1-2 GHz band;
4 is a third satellite receiving antenna for receiving a satellite digital audio broadcast signal as a fourth satellite,
Reference numeral 5 denotes a first satellite receiving antenna provided with a converter 5a for receiving CS as a first satellite and converting the CS into an intermediate frequency signal in a band of 1 to 2 GHz.
And 10, a first duplexer for separating and outputting the BS intermediate frequency signal and the 110 ° CS first intermediate frequency signal,
An up converter 11 for converting the 110 ° CS first intermediate frequency signal into a 110 ° CS second intermediate frequency signal having a different frequency from the CS intermediate frequency signal and the BS intermediate frequency signal;
12 is a first mixer for mixing the BS intermediate frequency signal and the 110 ° CS second intermediate frequency signal,
13 is a third mixer for mixing the mixed signal (specifically, BS intermediate frequency signal and 110 ° CS second intermediate frequency signal) output from the first mixer 12 with the satellite digital audio broadcast signal;
Reference numeral 14 designates the VHF band terrestrial television broadcast signal, the UHF band terrestrial television broadcast signal, the BS intermediate frequency signal, the 110 ° CS second intermediate frequency signal, the satellite digital audio broadcast signal, and the CS intermediate frequency signal at predetermined levels. This is a mixed amplifier that amplifies and mixes the signals until output to the transmission line L.
The up-converter 11 corresponds to a first frequency converter of the present invention, and the mixing amplifier 14 corresponds to a second mixer.
Each of the devices 1 to 14 is generally installed in a place where outdoor radio waves can be received.
[0017]
Next, devices generally installed indoors will be described.
Reference numeral 15 denotes a distributor, and 16 denotes a terminal terminal, which is connected to each distribution terminal of the distributor 15.
Reference numeral 17 denotes a second duplexer for separating and outputting each satellite signal and terrestrial television signal output to the terminal.
Reference numeral 18 denotes a downconverter for re-converting the 110 ° CS second intermediate frequency signal into the original second 110 ° CS first intermediate frequency signal.
The down converter 18 corresponds to the second frequency converter of the present invention.
19 is a 110 ° CS receiver, 20 is a CS receiver, 22 is a satellite digital audio broadcast receiver, and 23 is a television receiver.
[0018]
Next, the up converter 11 and the down converter 18 will be described in detail with reference to FIGS.
FIG. 2 is a block diagram showing a detailed configuration of the upconverter 11, in which 11a is an input terminal, 11b is an output terminal, 11c is a frequency conversion circuit, 11d is a power supply filter, and 11e is a power supply circuit. Note that the frequency conversion circuit 11c corresponds to a first frequency conversion circuit of the present invention.
The up-converter is housed in a case that has conductivity, has a shielding effect, and has good waterproofness. The power supply for operating the up-converter is supplied from the mixed amplifier 14 to the 110 ° CS second intermediate. The signal is supplied so as to be superimposed on a transmission line for transmitting a frequency signal.
[0019]
FIG. 3 is a block diagram showing a detailed configuration of the down converter 18, wherein 18a is an input terminal, 18b is an output terminal, 18c is a frequency conversion circuit, 18d is a power supply filter, and 18e is a power supply circuit. Note that the frequency conversion circuit 18c corresponds to a second frequency conversion circuit of the present invention.
The down converter is housed in a case having conductivity and a shielding effect, and the power supply for the operation of the down converter is transmitted from the 110 ° CS receiver 19 to the transmission line for transmitting the 110 ° CS first intermediate frequency signal. They are supplied in an overlapping manner.
[0020]
Next, the mixing amplifier 14 will be described in detail with reference to FIG.
14a is an input terminal for inputting a VHF band terrestrial television broadcast signal, 14b is an input terminal for inputting a UHF band terrestrial television broadcast signal,
14c is an input terminal for inputting a BS intermediate frequency signal, a 110 ° CS second intermediate frequency signal, and a satellite digital audio broadcast signal,
14d is an input terminal for inputting a CS intermediate frequency signal,
14e is an input terminal for inputting AC100V,
An output terminal 14f outputs each satellite broadcast signal and terrestrial television signal.
24a to 24d are amplifiers for amplifying each signal to a predetermined level;
14g-14i are power supply filters,
14j is a power supply circuit.
14k is a mixer for mixing the terrestrial television broadcast signal in the VHF band and the terrestrial television broadcast signal in the UHF band.
Reference numeral 141 denotes a duplexer for splitting and outputting the BS intermediate frequency signal, the 110 ° CS second intermediate frequency signal, and the satellite digital audio broadcast signal.
14m is a mixer for mixing the 110 ° CS second intermediate frequency signal / satellite digital audio broadcast signal and the CS intermediate frequency signal,
14n is a mixer for mixing the mixed signal (specifically, 110 ° CS second intermediate frequency signal, satellite digital audio broadcast signal, CS intermediate frequency signal) mixed with the mixer 14m with the BS intermediate frequency signal.
Reference numeral 14o denotes a mixed signal (specifically, BS intermediate frequency signal, 110 ° CS second intermediate frequency signal, satellite digital audio broadcast signal, CS intermediate frequency signal) mixed by the mixer 14n, and VHF * mixed by the mixer 14k. This is a mixer for mixing and outputting terrestrial television broadcasting in the UHF band.
The mixing amplifier 14 is housed in a case having conductivity, having a shielding effect, and having good waterproofness. Further, the mixing amplifier 14 is provided in the vicinity of each antenna or under a eave where a power source can be easily secured.
[0021]
Next, the second duplexer 17 will be described in detail with reference to FIG.
17a is an input terminal, 17b is a satellite digital audio broadcast signal output terminal, 17c is a 110 ° CS second intermediate frequency signal output terminal, 17d is a CS intermediate frequency signal output terminal, 17e is a BS intermediate frequency signal output terminal, and 17f is a VHF band. And UHF band terrestrial television broadcast signal output terminals. 17g and 17h are power supply filters. 17i is a terrestrial television signal among the BS intermediate frequency signal, 110 ° CS second intermediate frequency signal, satellite digital audio broadcast signal, CS intermediate frequency signal and VHF / UHF band terrestrial television broadcast signal input to the input terminal. 17j is a demultiplexer for extracting and outputting only the 110 ° CS second intermediate frequency signal from the remaining signal extracted in 17i, and extracting the same. 17k is a duplexer for extracting and outputting only the CS intermediate frequency signal from the remaining signal extracted at 17j, and 17l is a duplexer for extracting the BS intermediate signal from the remaining signal extracted at 17k. This is a duplexer for separating and outputting a frequency signal and a terrestrial television broadcast signal in the VHF / UHF band.
Note that the second duplexer 17 is housed in a case having conductivity and having a shielding effect.
[0022]
Next, the operation of the satellite signal receiving and transmitting system will be described in detail.
The BS signal (third satellite signal) and 110 ° CS signal (second satellite signal) received by the second satellite receiving antenna 3 are converted by the converter 3a as shown in FIG. 6A, and the BS signal is 1032 to 1489 MHz. The 110 ° CS signal is converted to a 110 ° CS first intermediate frequency signal of 1595 MHz to 2071 MHz, and then supplied to the first duplexer 10.
The two intermediate frequency signals supplied to the first demultiplexer 10 are respectively demultiplexed and output. The 110 ° CS first intermediate frequency signal is converted by the frequency conversion circuit 11 c of the up-converter 11 into the BS intermediate frequency signal and the BS intermediate frequency signal. The signal is converted into a high-frequency 110 ° CS second intermediate frequency signal without overlapping a frequency with a CS intermediate frequency signal described later.
In the present embodiment, 2126 MHz to 2602 MHz, which is 531 MHz higher than the 110 ° CS first intermediate frequency signal, is adopted as the 110 ° CS second intermediate frequency signal.
On the other hand, the BS intermediate frequency signal split by the splitter 10 and the 110 ° CS second intermediate frequency signal frequency-converted by the up-converter 11 are mixed by the mixer 12, and the output terminal of the mixer 12 is output. 6B, the BS intermediate frequency signal and the 110 ° CS second intermediate frequency signal are output.
[0023]
Next, in the mixer 13, the satellite digital audio broadcast signal (2630 MHz to 2655 MHz) as the fourth satellite signal is further mixed and supplied to the input terminal 14 c of the mixing amplifier 14.
Further, a CS intermediate frequency signal obtained by converting the CS signal (first satellite signal) received by the first satellite receiving antenna 5 to 1572 MHz to 2072 MHz by the converter 5a is supplied to the input terminal 14d of the mixing amplifier 14.
The input terminals 14a and 14b of the mixing amplifier 14 are supplied with VHF and UHF terrestrial television broadcasting signals received by the VHF receiving antenna 1 and the UHF receiving antenna 2, respectively.
[0024]
VHF band / UHF band terrestrial television broadcast signals input to input terminals 14a and 14b of the mixing amplifier 14 are respectively amplified to predetermined levels by amplifiers 24a and 24b, mixed by a mixer 14k, and mixed by a mixer 14o. Supplied to
The BS intermediate frequency signal, the mixed signal of the 110 ° CS second intermediate frequency signal, the satellite digital audio broadcasting signal, and the CS intermediate frequency signal input to the input terminals 14c and 14d, respectively, are amplified by power amplifiers 14g and 14h. After being amplified to a predetermined level by 24c and 24d, the 110 ° CS second intermediate frequency signal / satellite digital audio broadcast signal demultiplexed by the demultiplexer 141 and the CS intermediate frequency signal amplified by the amplifier 24d are mixed by the mixer 14m. Are mixed by the mixer 14m, and the other BS intermediate frequency signal split by the splitter 141 is mixed by the mixer 14n and supplied to the mixer 14o.
[0025]
In the mixer 14o, the mixed signal of the mixer 14k (specifically, the terrestrial television broadcast signal in the VHF / UHF band) and the mixed signal of the mixer 14n (specifically, the BS intermediate frequency signal, 110 ° CS second intermediate signal) Frequency signal, satellite digital audio broadcast signal, and CS intermediate frequency signal) are mixed and supplied to an output terminal 14f via a power supply filter 14i.
FIG. 6C shows the frequency spectrum at the output terminal 14f of the mixing amplifier 14.
The power for operation of the amplifiers 24a to 24d is supplied via an input terminal 14e for inputting commercial power of AC 100V and a power supply circuit 14j. In addition, in order to operate the converter 3a and the up-converter 11 of the second satellite receiving antenna 3 and the satellite digital audio broadcast receiving antenna 4, an operating power supply (DC 15 V in this embodiment) is supplied to the input terminal 14c via the power supply filter 14g. are doing.
[0026]
The duplexer 10 and the mixers 12 and 13 are configured so that an operating power supply can pass therethrough. Further, a satellite switching signal (presence / absence of a signal of 20 kHz to 50 kHz) output from a CS receiver 20 to be described later and a power supply / polarization switching signal (11 V DC or 15 V DC) for operating the converter 5 a are mixed amplifiers via a transmission line L. It is supplied to 14 output terminals 14f.
Power supply filters 14i and 14h are provided to transmit the satellite switching signal and the polarization switching signal to the first satellite receiving antenna 5 (specifically, the converter 5a) connected to the input terminal 14d.
[0027]
Next, the mixed signal output to the output terminal 14f of the mixing amplifier 14 is distributed to a required number by the distributor 15, and transmitted to a plurality of terminal terminals 16a.
The mixed signal transmitted to the terminal 16 is input to the input terminal 17a of the second splitter 17 and input to the splitter 17i via the power filter 17g. Digital audio broadcast signal, 110 ° CS second intermediate frequency signal, CS intermediate frequency signal, BS intermediate frequency signal, VHF / UHF terrestrial television broadcast signal are output to output terminals 17b, 17c, 17d, 17e, 17f, respectively. Is done.
The power supply filters 17g and 17h transmit the satellite switching signal and the polarization switching signal output from the CS receiver 20 to the first satellite receiving antenna 5 (specifically, the converter 5a) in the same manner as the 14i and 14h. It is provided in.
[0028]
The satellite digital audio broadcast signal output to the output terminal 17b of the second duplexer 17 is received by the satellite digital audio broadcast receiver 22.
Further, the 110 ° CS second intermediate frequency signal output to the output terminal 17c is input to the input terminal 18a of the down converter 18 and converted into the original 110 ° CS first intermediate frequency signal by the frequency conversion circuit 18c. The signal is output to the output terminal 18b via the power supply filter 18d. The 110 ° CS first intermediate frequency signal output to the output terminal 18b is received by the 110 ° CS receiver 19, and the video / audio signal is supplied to the television receiver 23 and displayed.
Here, the frequency spectra at the input terminal 18a and the output terminal 18b of the down converter 18 are shown in FIGS. 6 (D) and 6 (E).
The operating power of the down converter is supplied from the 110 ° CS receiver 19 to an output terminal 18b via a signal transmission path, separated and output by a power filter 18d, and supplied to a frequency conversion circuit 18c via a power circuit 18e. It is configured to be.
[0029]
Next, the CS intermediate frequency signal output to the output terminal 17d is received by the CS receiver 20, and the video and audio signals are supplied to the television receiver and displayed.
Here, the frequency spectrum at the output terminal 17d is shown in FIG.
When the user operates the CS receiver 20 to change the receiving channel, the satellite switching signal (presence or absence of a signal of 20 kHz to 50 kHz) corresponding to the receiving channel and the operating power / polarization switching signal (DC11V / 15V) Is generated, supplied to the output terminal 17d via the signal transmission line, and transmitted to the converter 5a via the power filters 17h and 17g, the terminal terminal 16, the distributor 15, and the power filters 14i and 14h as described above. Have been.
[0030]
It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention as exemplified below. The same components as those of the embodiment of the present invention are denoted by the same reference numerals, and the detailed description will be omitted.
For example, in the present invention, the up converter 11, the duplexer 10, and the mixer 12 are described as being provided separately, but may be changed to an up converter 21 integrally formed as shown in FIG. By doing so, the number of devices can be reduced, so that installation work is facilitated and maintenance is facilitated.
Next, in the present invention, the second duplexer 17 and the down converter 18 are separately provided, but may be changed to an integrated down converter 28 as shown in FIG. By doing so, the number of devices and the number of wirings are reduced, so that installation work is facilitated and the appearance is improved.
[0031]
8 and 5 is that a distributor 28h and a mixer 28g are provided. The BS intermediate frequency signal demultiplexed by the demultiplexer 171 is distributed by the distributor 28h, and one distribution terminal is mixed with the 110 ° CS first intermediate frequency signal by the mixer 28g and output via the power supply filter 18d. 28c. In this way, a 110 ° CS receiver with a built-in BS can be used without preparing a distributor or mixer externally.
In the present embodiment, the antennas 1 and 2 for receiving terrestrial television broadcasting in the VHF band and the UHF band have been described. However, for example, the antennas may be changed to correspond to, for example, 70 to 770 MHz CATV signals. Good. In this case, it is necessary to partially change the mixing amplifier 14 so as to support the CATV signal.
[0032]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, in a satellite signal receiving and transmitting system,
A first satellite receiving antenna for receiving a signal from the first satellite and switching and outputting an intermediate frequency signal having a set of different polarizations at least partially overlapping in frequency;
Receiving a signal of the second satellite and a signal of the third satellite, and a first intermediate frequency signal of the second satellite at least partially overlapping the frequency of the intermediate frequency signal of the first satellite; A second satellite receiving antenna that outputs an intermediate frequency signal of a third satellite that does not overlap with the frequency of the frequency signal;
A first duplexer for splitting and outputting the first intermediate frequency signal of the second satellite and the intermediate frequency signal of the third satellite received by the second satellite receiving antenna;
A first frequency for converting the first intermediate frequency signal of the second satellite into a second intermediate frequency signal of a second satellite having a different frequency from the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite; A converter,
A first mixer for mixing the intermediate frequency signal of the third satellite and the second intermediate frequency signal of the second satellite;
A second mixer for mixing the mixed signal mixed by the first mixer with the intermediate frequency signal of the first satellite;
The intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite output from the second mixer are transmitted to a terminal through a single transmission line. ,
A terminal terminal is provided with a second duplexer that separates and outputs the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite, respectively.
A second frequency converter for returning the second intermediate frequency signal of the second satellite output from the second duplexer to the original first intermediate frequency signal of the second satellite;
It is possible to provide a satellite signal receiving and transmitting system that transmits each satellite signal (specifically, an intermediate frequency signal) to each terminal terminal through one transmission line, has a small number of wires, and is excellent in aesthetic appearance.
[0033]
According to the second aspect of the present invention, in the second mixer, the frequency of the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the frequency of the second intermediate frequency signal of the second satellite may overlap. Since the system is configured to mix signals that do not exist and transmit them to the terminal terminals,
It is possible to provide a satellite signal reception / transmission system capable of increasing the frequency utilization efficiency of a transmission line.
[0034]
According to the third aspect of the present invention, the fourth satellite signal for receiving the fourth satellite signal whose frequency does not overlap with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite. 3 satellite receiving antennas,
A third mixer for mixing the fourth satellite signal with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite; Between the mixer and the second mixer,
It is possible to provide a satellite signal reception / transmission system that can be easily added to an existing satellite signal reception / transmission system even when a satellite is added.
[0035]
According to a fourth aspect of the present invention, in the satellite signal receiving and transmitting system according to any one of the first to third aspects,
Since the first duplexer, the first frequency converter, and the first mixer are integrally formed,
It is possible to provide a satellite signal reception and transmission system with a small number and types of devices to be added and a low installation cost.
[0036]
According to a fifth aspect of the present invention, in the satellite signal receiving and transmitting system according to any one of the first to fourth aspects,
Since the second duplexer and the second frequency converter are integrally formed, the number and types of additional devices are small, the installation cost is low, and the installation is easy even in a small room. A simple satellite signal receiving and transmitting system can be provided.
[0037]
According to the invention of claim 6, since the second mixer incorporates an amplifier for amplifying each signal to a predetermined level,
It is possible to provide a satellite signal receiving and transmitting system capable of providing a good image without deteriorating C / N.
[0038]
According to the invention of claim 7, the first satellite is a communication satellite,
The second satellite is a 110-degree east longitude communication satellite,
The third satellite is a broadcast satellite,
Since the fourth satellite is a satellite digital audio broadcast,
It is possible to provide a satellite signal reception / transmission system that can be easily added to an existing satellite signal reception / transmission system even when a satellite is added.
[0039]
According to an eighth aspect of the present invention, there is provided an upconverter used in the satellite signal receiving and transmitting system according to any one of the first to seventh aspects,
An input terminal for inputting a first intermediate frequency signal of the second satellite,
An output terminal for outputting a second intermediate frequency signal of the second satellite;
The first intermediate frequency signal of the second satellite is not overlapped with the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite between the input terminal and the output terminal, and Since it has a first frequency conversion circuit for converting into a second intermediate frequency signal having a high frequency,
An up-converter for transmitting each satellite intermediate frequency signal to each terminal via one transmission line can be provided.
[0040]
According to the ninth aspect of the present invention, in the up-converter according to the eighth aspect, the operating frequency power supply superimposed on the transmission line connected to the output terminal is extracted and the first frequency conversion is performed. Since it is configured to supply the operating power of the circuit,
An upconverter that does not require wiring for power supply can be provided.
[0041]
According to a tenth aspect of the present invention, there is provided a down converter used in the satellite signal receiving and transmitting system according to any one of the first to seventh aspects,
An input terminal for inputting a second intermediate frequency signal of the second satellite,
An output terminal for outputting a first intermediate frequency signal of the second satellite,
Since a second frequency conversion circuit for converting the second intermediate frequency signal of the second satellite into the original first intermediate frequency signal of the second satellite is provided between the input terminal and the output terminal,
It is possible to provide a down converter for converting a mixed signal transmitted to each terminal terminal through one transmission line into an original satellite intermediate frequency signal.
[0042]
According to the eleventh aspect of the present invention, there is provided the down converter according to the tenth aspect,
Since the power supply for operation superimposed on the transmission line connected to the output terminal is extracted to supply the power for operation of the second frequency conversion circuit,
A down converter that does not require wiring for power supply can be provided.
[Brief description of the drawings]
FIG. 1 is a block diagram of a satellite signal receiving and transmitting system according to the present invention.
FIG. 2 is a block diagram showing a configuration of an up converter.
FIG. 3 is a block diagram illustrating a configuration of a down converter.
FIG. 4 is a block diagram illustrating a configuration of a mixed amplifier.
FIG. 5 is a block diagram showing a configuration of a second duplexer.
FIG. 6 is an explanatory diagram showing a frequency spectrum.
(A) The frequency spectrum at the output terminal of the converter 3a.
(B) The frequency spectrum at the first mixer output terminal.
(C) The frequency spectrum at the output terminal of the mixing amplifier.
(D) The frequency spectrum at the second intermediate frequency signal output terminal of the second satellite of the second duplexer.
(E) Frequency spectrum at the output terminal of the downconverter.
(F) A frequency spectrum at the intermediate frequency signal output terminal of the first satellite of the second duplexer.
FIG. 7 is a block diagram of an upconverter according to another embodiment.
FIG. 8 is a block diagram of a down converter according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... VHF receiving antenna, 2 ... UHF receiving antenna, 3 ... 2nd satellite receiving antenna, 4 ... 3rd satellite receiving antenna, 5 ... 1st satellite receiving antenna, 10 ... 1st duplexer, 11 ... 1st frequency converter, 12 first mixer, 13 third mixer, 14 mixing amplifier, 15 distributor, 16 terminal terminal, 17 second divider, 18th 2 frequency converters, 19 ... 110 ° CS receiver, 20 ... CS receiver, 21 ... first frequency converter, 22 ... Satellite digital audio broadcasting receiver, 23 ... TV receiver, 24 ... Amplifier, 28 ... A second frequency converter.

Claims (11)

衛星信号受信伝送システムにおいて，
第１衛星の信号を受信して，少なくとも一部の周波数が重複する，異なる偏波の組からなる中間周波信号を切換えて出力する第１の衛星受信アンテナと，
第２衛星の信号と第３衛星の信号を受信して，前記第１衛星の中間周波信号の周波数と少なくとも一部が重複する第２衛星の第１中間周波信号及び，前記第１衛星の中間周波信号の周波数とは重複しない第３衛星の中間周波信号を出力する第２の衛星受信アンテナと，
前記第２の衛星受信アンテナが受信した第２衛星の第１中間周波信号と第３衛星の中間周波信号を分波して出力する第１の分波器と，
前記第２衛星の第１中間周波信号を，前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が異なる第２衛星の第２中間周波信号に変換するための第１の周波数変換器と，
前記第３衛星の中間周波信号と第２衛星の第２中間周波信号を混合するための第１の混合器と，
前記第１の混合器で混合された混合信号と第１衛星の中間周波信号を混合するための第２の混合器を備え，
前記第２の混合器から出力される前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号を，１本の伝送線路で端末端子まで伝送すると共に，
端末端子には前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号とを各々分波して出力する第２の分波器を備え，
前記第２の分波器から出力された第２衛星の第２中間周波信号を，元の第２衛星の第１中間周波信号に戻すための第２の周波数変換器を備えた
ことを特徴とする衛星信号受信伝送システム。In a satellite signal reception and transmission system,
A first satellite receiving antenna for receiving a signal from the first satellite and switching and outputting an intermediate frequency signal having a set of different polarizations at least partially overlapping in frequency;
Receiving a signal of the second satellite and a signal of the third satellite, and a first intermediate frequency signal of the second satellite at least partially overlapping the frequency of the intermediate frequency signal of the first satellite; A second satellite receiving antenna that outputs an intermediate frequency signal of a third satellite that does not overlap with the frequency of the frequency signal;
A first duplexer for splitting and outputting the first intermediate frequency signal of the second satellite and the intermediate frequency signal of the third satellite received by the second satellite receiving antenna;
A first frequency for converting the first intermediate frequency signal of the second satellite into a second intermediate frequency signal of a second satellite having a different frequency from the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite; A converter,
A first mixer for mixing the intermediate frequency signal of the third satellite and the second intermediate frequency signal of the second satellite;
A second mixer for mixing the mixed signal mixed by the first mixer with the intermediate frequency signal of the first satellite;
The intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite output from the second mixer are transmitted to a terminal through a single transmission line. ,
A terminal terminal is provided with a second duplexer that separates and outputs the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite, respectively.
A second frequency converter for returning the second intermediate frequency signal of the second satellite output from the second duplexer to the original first intermediate frequency signal of the second satellite. Satellite signal receiving and transmitting system. 前記第２の混合器で，前記第１衛星の中間周波信号と第３衛星の中間周波信号と第２衛星の第２中間周波信号と周波数が重複することがない信号を混合して，端末端子まで伝送する
ことを特徴とする請求項１に記載の衛星信号受信伝送システム。The second mixer mixes the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite with a signal whose frequency does not overlap, and 2. The satellite signal receiving / transmitting system according to claim 1, wherein the satellite signal is transmitted to the satellite. 前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号と周波数が重複しない第４衛星信号を受信するための第３の衛星受信アンテナと，
前記第４衛星信号と，前記第１衛星の中間周波信号及び第３衛星の中間周波信号及び第２衛星の第２中間周波信号を混合するための第３の混合器を，前記第１の混合器と第２の混合器の間に備えた
ことを特徴とする請求項１乃至請求項２のいずれかに記載の衛星信号受信伝送システム。A third satellite receiving antenna for receiving a fourth satellite signal whose frequency does not overlap with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite;
A third mixer for mixing the fourth satellite signal with the intermediate frequency signal of the first satellite, the intermediate frequency signal of the third satellite, and the second intermediate frequency signal of the second satellite; 3. The satellite signal receiving and transmitting system according to claim 1, wherein the satellite signal receiving and transmitting system is provided between the mixer and the second mixer. 前記請求項１乃至請求項３のいずれか記載の衛星信号受信伝送システムにおいて，
前記第１の分波器と，第１の周波数変換器と，第１の混合器とを一体的に形成した
ことを特徴とする衛星信号受信伝送システム。In the satellite signal receiving and transmitting system according to any one of claims 1 to 3,
A satellite signal receiving and transmitting system, wherein the first splitter, the first frequency converter, and the first mixer are integrally formed. 前記請求項１乃至請求項４のいずれか記載の衛星信号受信伝送システムにおいて，
前記第２の分波器と，前記第２の周波数変換器とを一体的に形成した
ことを特徴とする衛星信号受信伝送システム。In the satellite signal receiving and transmitting system according to any one of claims 1 to 4,
A satellite signal receiving and transmitting system, wherein the second demultiplexer and the second frequency converter are integrally formed. 前記第２の混合器に，各信号を所定レベルまで増幅する増幅器を内蔵した
ことを特徴とする請求項１乃至請求項５のいずれかに記載の衛星信号受信伝送システム。6. The satellite signal receiving and transmitting system according to claim 1, wherein an amplifier for amplifying each signal to a predetermined level is built in said second mixer. 前記第１衛星が通信衛星であり，
前記第２衛星が東経１１０度通信衛星であり，
前記第３衛星が放送衛星であり，
前記第４衛星が衛星ディジタル音声放送である
ことを特徴とする請求項１乃至請求項６のいずれかに記載の衛星信号受信伝送システム。The first satellite is a communication satellite,
The second satellite is a 110-degree east longitude communication satellite,
The third satellite is a broadcast satellite,
7. The satellite signal receiving and transmitting system according to claim 1, wherein the fourth satellite is a satellite digital audio broadcast. 前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するアップコンバータであって，
前記第２衛星の第１中間周波信号を入力するための入力端子と，
前記第２衛星の第２中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子との間には，前記第２衛星の第１中間周波信号を前記第１衛星の中間周波信号及び第３衛星の中間周波信号と周波数が重複することがなく，かつ，周波数が高い第２中間周波信号に変換するための第１の周波数変換回路を備えた
ことを特徴とするアップコンバータ。An upconverter used in the satellite signal reception / transmission system according to any one of claims 1 to 7,
An input terminal for inputting a first intermediate frequency signal of the second satellite,
An output terminal for outputting a second intermediate frequency signal of the second satellite;
The first intermediate frequency signal of the second satellite is not overlapped with the intermediate frequency signal of the first satellite and the intermediate frequency signal of the third satellite between the input terminal and the output terminal, and An up-converter comprising a first frequency conversion circuit for converting a second intermediate frequency signal having a high frequency. 前記請求項８に記載のアップコンバータであって，
前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第１の周波数変換回路の動作電源を供給するように構成した
ことを特徴とするアップコンバータ。The upconverter according to claim 8, wherein:
An up-converter configured to extract an operation power supply superimposed on a transmission line connected to the output terminal, and to supply an operation power supply for the first frequency conversion circuit. 前記請求項１乃至請求項７のいずれか記載の衛星信号受信伝送システムで使用するダウンコンバータであって，
前記第２衛星の第２中間周波信号を入力するための入力端子と，
前記第２衛星の第１中間周波信号を出力するための出力端子とを備え，
前記入力端子と出力端子の間には，前記第２衛星の第２中間周波信号を元の第２衛星の第１中間周波信号に変換するための第２の周波数変換回路を備えた
ことを特徴とするダウンコンバータ。A down-converter used in the satellite signal receiving and transmitting system according to any one of claims 1 to 7,
An input terminal for inputting a second intermediate frequency signal of the second satellite,
An output terminal for outputting a first intermediate frequency signal of the second satellite,
A second frequency conversion circuit for converting a second intermediate frequency signal of the second satellite into an original first intermediate frequency signal of the second satellite is provided between the input terminal and the output terminal. And down converter. 前記請求項１０に記載のダウンコンバータであって，
前記出力端子に接続された伝送線路に重畳されている動作用電源を抽出して，前記第２の周波数変換回路の動作電源を供給するよう構成した
ことを特徴とするダウンコンバータ。The down converter according to claim 10, wherein
A down converter configured to extract an operation power supply superimposed on a transmission line connected to the output terminal, and to supply an operation power supply for the second frequency conversion circuit.
JP2002183445A 2002-06-24 2002-06-24 Satellite signal reception and transmission system, up-converter and down-converter Expired - Fee Related JP3949011B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009164879A (en) * 2008-01-07 2009-07-23 Sony Corp Power supply adapter and power supply system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009164879A (en) * 2008-01-07 2009-07-23 Sony Corp Power supply adapter and power supply system

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