JP2015104018A - Receiver - Google Patents

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JP2015104018A
JP2015104018A JP2013244290A JP2013244290A JP2015104018A JP 2015104018 A JP2015104018 A JP 2015104018A JP 2013244290 A JP2013244290 A JP 2013244290A JP 2013244290 A JP2013244290 A JP 2013244290A JP 2015104018 A JP2015104018 A JP 2015104018A
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frequency
circularly polarized
handed
local oscillation
polarized wave
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JP6257284B2 (en
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正史 長坂
Masafumi Nagasaka
正史 長坂
雅 亀井
Masa Kamei
雅 亀井
進 中澤
Susumu Nakazawa
進 中澤
祥次 田中
Shoji Tanaka
祥次 田中
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Japan Broadcasting Corp
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Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a receiver for a broadcast wave capable of generating an intermediate frequency (IF) for left-turn circular polarization without affecting an IF for right-turn circular polarization.SOLUTION: A receiver 1 includes: a depolarization part 11 for separating a broadcast wave received by an antenna into a right-turning circularly polarized wave and a left-turning circularly polarized wave; a first frequency conversion part 12 for performing frequency conversion on the right-turning circularly polarized wave into a right-turning intermediate frequency through first arithmetic operation for reducing a first local oscillation frequency; a second frequency conversion part 13 for performing frequency conversion on the left-turning circularly polarized wave into a left-turning intermediate frequency by performing second arithmetic operation for reducing a second local oscillation frequency multiple times; and a multiplexer 14 for multiplexing the right-turning intermediate frequency and the left-turning intermediate frequency.

Description

本発明は、放送波の受信装置に関する。   The present invention relates to a broadcast wave receiver.

従来、衛星放送では、円偏波が用いられている。現状、衛星基幹放送、いわゆるBS(Broadcasting Satellite)及び東経110度CS(Communications Satellite)は、共に右旋円偏波を用いている。右旋円偏波と左旋円偏波とは共用可能なため、各衛星は、同一周波数で異なる番組の送信が可能である。   Conventionally, circularly polarized waves are used in satellite broadcasting. Currently, satellite basic broadcasting, so-called BS (Broadcasting Satellite) and 110 degrees CS (Communications Satellite) both use right-handed circularly polarized waves. Since right-handed circular polarization and left-handed circular polarization can be shared, each satellite can transmit different programs at the same frequency.

衛星放送で用いられる12GHz帯の電波は、周波数が高いため、宅内配線での減衰が大きい。そこで、受信アンテナで受信された放送波は、中間周波数(IF:Intermediate Frequency)に変換され、同軸ケーブルにより受信機まで伝送される。   Since the 12 GHz band radio wave used in satellite broadcasting has a high frequency, attenuation in the home wiring is large. Therefore, the broadcast wave received by the receiving antenna is converted to an intermediate frequency (IF) and transmitted to the receiver through a coaxial cable.

なお、BSでは、放送用周波数として11.7GHz〜12.2GHzが使用され、右旋円偏波用IFとして1032MHz〜1489MHzが使用されている。また、CSでは、放送用周波数として12.25GHz〜12.75GHzが使用され、右旋円偏波用IFとして1595MHz〜2071MHzが使用されている。
地上デジタルテレビ放送(地上TV)も、衛星放送と同一の同軸ケーブルにより宅内伝送することが一般的である。地上TVの周波数は、470MHz〜710MHzである。
ケーブルテレビ(ケーブルTV)の信号と衛星放送のIFとを混合し、同一の同軸ケーブルで宅内伝送する視聴形態もある。ケーブルTVの周波数は、10MHz〜770MHzである。
In the BS, 11.7 GHz to 12.2 GHz is used as the broadcasting frequency, and 1032 MHz to 1489 MHz is used as the right-hand circularly polarized IF. In CS, 12.25 GHz to 12.75 GHz is used as a broadcast frequency, and 1595 MHz to 2071 MHz is used as a right-hand circularly polarized IF.
Digital terrestrial television broadcasting (terrestrial TV) is also generally transmitted in the home using the same coaxial cable as satellite broadcasting. The frequency of terrestrial TV is 470 MHz to 710 MHz.
There is also a viewing mode in which a cable TV (cable TV) signal and a satellite broadcast IF are mixed and transmitted in the home using the same coaxial cable. The frequency of the cable TV is 10 MHz to 770 MHz.

通常、複数の放送波は、1本の同軸ケーブルに重畳されて受信機まで伝送される。したがって、各放送波の中間周波数は、互いに重ならないように変換される必要がある。このような状況において、例えば、右旋円偏波用と同様の帯域幅を要する左旋円偏波用のIFを、右旋円偏波用のIF及び放送波と重ならないように配置する受信装置として、以下のものが提案されている。
(1)CSの左旋円偏波を、2100MHz〜2600MHz付近のIF(Intermediate Frequency)に変換して伝送するもの(例えば、非特許文献1参照)。
(2)BSの左旋円偏波を、2000MHz〜2600MHz付近のIFに変換し、CSの左旋円偏波を、2600MHz〜3100MHz付近のIFに変換して伝送するもの(例えば、特許文献1参照)。
(3)BSの左旋円偏波とCSの左旋円偏波とを分波して周波数変換するもの(特願2013−145377号明細書)。
(4)BSの左旋円偏波とCSの左旋円偏波との周波数配列を入れ替えて周波数変換するもの(特願2013−145381号明細書)。
Usually, a plurality of broadcast waves are superimposed on one coaxial cable and transmitted to a receiver. Therefore, the intermediate frequency of each broadcast wave needs to be converted so as not to overlap each other. In such a situation, for example, a receiver that arranges an IF for left-handed circular polarization that requires the same bandwidth as that for right-handed circular polarization so as not to overlap with the IF for right-handed circular polarization and broadcast waves. The following have been proposed.
(1) The CS left-handed circularly polarized wave is converted to IF (Intermediate Frequency) near 2100 MHz to 2600 MHz and transmitted (for example, see Non-Patent Document 1).
(2) A BS left-handed circularly polarized wave is converted into an IF in the vicinity of 2000 MHz to 2600 MHz, and a CS left-handed circularly polarized wave is converted into an IF in the vicinity of 2600 MHz to 3100 MHz for transmission (see, for example, Patent Document 1) .
(3) Demultiplexing BS left-handed circularly polarized wave and CS left-handed circularly polarized wave to convert the frequency (Japanese Patent Application No. 2013-145377).
(4) A frequency conversion is performed by switching the frequency arrangement of the left-handed circularly polarized wave of BS and the left-handed circularly polarized wave of CS (Japanese Patent Application No. 2013-14581).

特開2002−305460号公報JP 2002-305460 A

武田ほか,“2600MHz伝送システムに使用するBS・110°CS衛星アンテナ”,電子情報通信学会技術研究報告,Vol.109,No.454,AP2009−218,pp.79−83,2010年3月Takeda et al., “BS / 110 ° CS satellite antenna used for 2600 MHz transmission system”, IEICE technical report, Vol. 109, no. 454, AP2009-218, pp. 79-83, March 2010

ところで、放送波をIFへ変換する際に使用される局部発振器(LO)の出力電力レベルは、+5dBm程度と高いため、右旋円偏波用のLO(例えば、周波数LO1=10.678GHz)と左旋円偏波用のLO(例えば、周波数LO2=9.603GHz)とが分離できない場合は、これらの差の周波数成分(例えば、LO1−LO2=1075MHz)が無視できないレベルで発生する。この周波数成分がBS右旋円偏波用のIF(1032MHz〜1489MHz)に干渉してしまい、受信映像が乱れる等の不具合が生じるおそれがある。   By the way, since the output power level of the local oscillator (LO) used when converting the broadcast wave to IF is as high as about +5 dBm, LO for right-handed circular polarization (for example, frequency LO1 = 10.678 GHz) When the left-handed circularly polarized LO (for example, frequency LO2 = 9.603 GHz) cannot be separated, the frequency component of these differences (for example, LO1-LO2 = 1075 MHz) occurs at a level that cannot be ignored. This frequency component interferes with the BS right-handed circularly polarized IF (1032 MHz to 1489 MHz), and there is a risk that problems such as disturbance of the received video may occur.

そこで、左旋円偏波用のLOの周波数を高くすることにより、LO1−LO2の周波数を低くした場合、左旋円偏波用IFの周波数も低くなる。この結果、BS左旋円偏波用IFがCS右旋円偏波用IFに近づき、両者間のガードバンドが十分に確保できなくなる。
また、右旋円偏波の周波数変換部と、左旋円偏波の周波数変換部とを分離することにより上述の干渉は回避できるが、構造が大型化してしまう上、一体化した基板による実現は難しかった。
Therefore, if the frequency of LO1-LO2 is lowered by increasing the frequency of LO for left-handed circular polarization, the frequency of IF for left-handed circular polarization is also lowered. As a result, the BS left-hand circularly polarized IF approaches the CS right-hand circularly polarized IF, and a sufficient guard band cannot be secured between them.
Moreover, the above-mentioned interference can be avoided by separating the right-handed circularly polarized frequency converter and the left-handed circularly polarized frequency converter. was difficult.

本発明は、右旋円偏波用のIFに影響を与えることなく、左旋円偏波用のIFを生成できる放送波の受信装置を提供することを目的とする。   An object of the present invention is to provide a broadcast wave receiving apparatus capable of generating an IF for left-handed circular polarization without affecting the IF for right-handed circular polarization.

本発明に係る受信装置は、アンテナにより受信された放送波を、右旋円偏波及び左旋円偏波に分離する偏波分離部と、前記右旋円偏波に対して、第1局部発振周波数を減ずる第1演算により右旋中間周波へ周波数変換を行う第1周波数変換部と、前記左旋円偏波に対して、第2局部発振周波数を減ずる第2演算を複数回行うことにより左旋中間周波へ周波数変換を行う第2周波数変換部と、前記右旋中間周波及び前記左旋中間周波を合波する合波器と、を備える。   A receiving apparatus according to the present invention includes a polarization separation unit that separates a broadcast wave received by an antenna into a right-handed circularly polarized wave and a left-handed circularly polarized wave, and a first local oscillation with respect to the right-handed circularly polarized wave. A first frequency converter that converts the frequency to a right-handed intermediate frequency by a first calculation that reduces the frequency, and a left-handed intermediate by performing a second operation that reduces the second local oscillation frequency multiple times for the left-handed circularly polarized wave A second frequency conversion unit that performs frequency conversion to a frequency, and a multiplexer that combines the right intermediate frequency and the left intermediate frequency.

この構成によれば、受信装置は、左旋円偏波用の第2周波数変換部によって多段階の周波数変換を行う。これにより、左旋円偏波用の局部発振周波数が調整されるので、受信装置は、局部発振周波数の差分の周波数成分を調整して、右旋円偏波用の中間周波に影響を与えることなく、左旋円偏波用の中間周波を生成できる。   According to this configuration, the receiving apparatus performs multi-stage frequency conversion by the second frequency conversion unit for left-handed circularly polarized waves. As a result, the local oscillation frequency for left-handed circularly polarized waves is adjusted, so that the receiving apparatus adjusts the frequency component of the difference between the local oscillation frequencies without affecting the intermediate frequency for right-handed circularly polarized waves. An intermediate frequency for left-handed circular polarization can be generated.

前記第2局部発振周波数、及び前記第1局部発振周波数と前記第2局部発振周波数との差の周波数は、前記第1演算又は前記第2演算により得られるいずれの中間周波の範囲にも含まれないように構成されてもよい。   The second local oscillation frequency and the difference frequency between the first local oscillation frequency and the second local oscillation frequency are included in any intermediate frequency range obtained by the first calculation or the second calculation. It may be configured not to.

この構成によれば、受信装置は、例えば2段階の周波数変換を行うことにより、放送波、及び各周波数変換後の周波数帯のいずれに対しても、局部発振周波数又は局部発振周波数の差分が重畳せず、干渉を回避できる。
また、右旋円偏波用及び左旋円偏波用それぞれの局部発振周波数、及び2つの局部発振周波数の差の周波数成分は、バンドパスフィルタ又はローパスフィルタにより容易に除去できる。
According to this configuration, the receiving device performs, for example, two-stage frequency conversion so that the local oscillation frequency or the difference between the local oscillation frequencies is superimposed on both the broadcast wave and the frequency band after each frequency conversion. Without interference.
Further, the local oscillation frequency for right-handed circularly polarized wave and the left-handed circularly polarized wave and the frequency component of the difference between the two local oscillation frequencies can be easily removed by a band-pass filter or a low-pass filter.

前記第2周波数変換部は、前記左旋中間周波の周波数範囲を所定値以上にするための前記第2局部発振周波数を用いてもよい。   The second frequency converter may use the second local oscillation frequency for setting the frequency range of the left-handed intermediate frequency to a predetermined value or more.

この構成によれば、受信装置は、左旋円偏波用の中間周波を右旋円偏波用の中間周波の高周波側に配置することにより、左旋円偏波用の中間周波を、右旋円偏波用の中間周波との干渉を回避して配置できる。したがって、受信装置は、右旋円偏波及び左旋円偏波を受信した場合に、これら複数の放送波の中間周波を1本の同軸ケーブルで伝送できる。   According to this configuration, the receiving apparatus arranges the intermediate frequency for left-handed circular polarization on the high-frequency side of the intermediate frequency for right-handed circular polarization, thereby converting the intermediate frequency for left-handed circular polarization into a right-handed circle. It can be arranged avoiding interference with the intermediate frequency for polarization. Therefore, when receiving a right-handed circularly polarized wave and a left-handed circularly polarized wave, the receiving device can transmit the intermediate frequencies of the plurality of broadcast waves with a single coaxial cable.

本発明によれば、右旋円偏波用のIFに影響を与えることなく、左旋円偏波用のIFを生成できる。   According to the present invention, an IF for left-handed circular polarization can be generated without affecting the IF for right-handed circular polarization.

実施形態に係る受信装置の構成を示すブロック図である。It is a block diagram which shows the structure of the receiver which concerns on embodiment. 実施形態に係る第1周波数変換部の構成を示す図である。It is a figure which shows the structure of the 1st frequency conversion part which concerns on embodiment. 実施形態に係る第2周波数変換部の構成を示す図である。It is a figure which shows the structure of the 2nd frequency conversion part which concerns on embodiment. 2段階の周波数変換を行わない場合の第1の例を示す図である。It is a figure which shows the 1st example in the case of not performing 2 steps | paragraphs of frequency conversion. 2段階の周波数変換を行わない場合の第2の例を示す図である。It is a figure which shows the 2nd example when not performing two steps of frequency conversion. 2段階の周波数変換を行わない場合の第3の例を示す図である。It is a figure which shows the 3rd example when not performing two steps of frequency conversion. 実施形態に係る2段階の周波数変換を行った場合の左旋円偏波用IFの生成例を示す図である。It is a figure which shows the example of production | generation of IF for left-handed circularly polarized wave at the time of performing the two-step frequency conversion which concerns on embodiment.

以下、本発明の実施形態の一例について説明する。
本実施形態の受信システムは、受信装置1と、右旋円偏波用及び左旋円偏波用の放送チューナを有するテレビ又はビデオ等の受信機3とを備える。
受信装置1は、右旋円偏波及び左旋円偏波を、それぞれIFへ周波数変換し、左旋円偏波のIFを右旋円偏波のIFよりも高周波側に配置する。
Hereinafter, an example of an embodiment of the present invention will be described.
The receiving system of the present embodiment includes a receiving device 1 and a receiver 3 such as a television or a video having a broadcast tuner for right-handed circular polarization and left-handed circular polarization.
The receiving device 1 converts the right-handed circularly polarized wave and the left-handed circularly polarized wave into IFs, respectively, and arranges the left-handed circularly polarized IF on the higher frequency side than the right-handed circularly polarized IF.

図1は、本実施形態に係る受信装置1の構成を示すブロック図である。
受信装置1は、偏波分離部11と、第1周波数変換部12と、第2周波数変換部13と、合波器14と、混合器15とを備える。
FIG. 1 is a block diagram showing the configuration of the receiving apparatus 1 according to this embodiment.
The receiving device 1 includes a polarization separation unit 11, a first frequency conversion unit 12, a second frequency conversion unit 13, a multiplexer 14, and a mixer 15.

偏波分離部11は、衛星放送受信アンテナ2により受信された放送衛星(BS及びCS)の電波を、右旋円偏波と左旋円偏波とに分離する。なお、偏波分離部11は、既存の偏波分離の方法を用いることができ、例えば、ハイブリッド回路を用いたもの、又は位相差板を用いたもの等であってよい。
偏波分離された右旋円偏波は、第1周波数変換部12に入力され、左旋円偏波は、第2周波数変換部13に入力される。
The polarization separation unit 11 separates the radio waves of the broadcasting satellites (BS and CS) received by the satellite broadcast receiving antenna 2 into right-handed circularly polarized light and left-handed circularly polarized wave. Note that the polarization separation unit 11 can use an existing polarization separation method, and may be, for example, one using a hybrid circuit or one using a phase difference plate.
The right-handed circularly polarized wave subjected to polarization separation is input to the first frequency converter 12, and the left-handed circularly polarized wave is input to the second frequency converter 13.

第1周波数変換部12は、既定の第1局部発振周波数(例えば、LO1=10.678GHz)を用いて、右旋円偏波をIFに周波数変換する。第1周波数変換部12への入力周波数(RF1)からLO1を引いた値が変換後の周波数(IF1=RF1−LO1)となる(第1演算)。
これにより、BS及びCSの右旋円偏波の受信信号は、BS右旋円偏波用IF(BS右旋IF)及びCS右旋円偏波用IF(CS右旋IF)となり、合波器14に入力される。
The first frequency conversion unit 12 converts the right-handed circularly polarized wave into IF using a predetermined first local oscillation frequency (for example, LO1 = 10.6678 GHz). The value obtained by subtracting LO1 from the input frequency (RF1) to the first frequency converter 12 is the converted frequency (IF1 = RF1-LO1) (first calculation).
As a result, the received signals of the BS and CS right-handed circularly polarized waves become the BS right-handed circularly polarized IF (BS right-handed IF) and the CS right-handed circularly polarized IF (CS right-handed IF). Is input to the device 14.

第2周波数変換部13は、第2局部発振周波数(例えば、LO2=4.802GHz)を用いて、左旋円偏波を、右旋円偏波用IFよりも高周波側のIFに周波数変換する。
このとき、第2周波数変換部13は、入力周波数(RF2)からLO2を減ずる処理(第2演算)を複数回(例えば、2回)行う(IF2=RF2−2×LO2)。以下、第2周波数変換部13は、2段階の周波数変換を行うものとして説明する。
The second frequency converter 13 converts the left-handed circularly polarized wave into a higher-frequency IF than the right-handed circularly polarized IF using the second local oscillation frequency (for example, LO2 = 4.802 GHz).
At this time, the second frequency conversion unit 13 performs a process (second calculation) for subtracting LO2 from the input frequency (RF2) a plurality of times (for example, twice) (IF2 = RF2-2 × LO2). Hereinafter, the second frequency conversion unit 13 will be described as performing two-stage frequency conversion.

合波器14は、第1周波数変換部12及び第2周波数変換部13により変換された各IFを合成し、同軸ケーブルで伝送する。   The multiplexer 14 combines the IFs converted by the first frequency converter 12 and the second frequency converter 13 and transmits them by a coaxial cable.

混合器15は、合波器14により合成された衛星放送信号のIFと、地上TV又はケーブルTVの信号を合成し、同軸ケーブルで伝送する。   The mixer 15 combines the IF of the satellite broadcast signal combined by the multiplexer 14 and the signal of the terrestrial TV or cable TV, and transmits the signal using a coaxial cable.

図2は、本実施形態に係る第1周波数変換部12の構成を示す図である。
第1周波数変換部12は、バンドパスフィルタ(BPF)121と、ミキサ122と、ローパスフィルタ(LPF)123とを備える。
FIG. 2 is a diagram illustrating a configuration of the first frequency conversion unit 12 according to the present embodiment.
The first frequency converter 12 includes a band pass filter (BPF) 121, a mixer 122, and a low pass filter (LPF) 123.

バンドパスフィルタ121によって不要波が除去されてRF1が取り出され、LO1と共にミキサ122に入力される。
ミキサ122は、RF1及びLO1から、第1演算によりIF1(=RF1−LO1)を生成する。
このとき、不要波であるイメージ(RF1+LO1)及びLO1は、ローパスフィルタ123によって除去される。
The unnecessary wave is removed by the band-pass filter 121, and RF1 is extracted and input to the mixer 122 together with LO1.
The mixer 122 generates IF1 (= RF1-LO1) from the RF1 and LO1 by the first calculation.
At this time, the image (RF1 + LO1) and LO1 which are unnecessary waves are removed by the low-pass filter 123.

図3は、本実施形態に係る第2周波数変換部13の構成を示す図である。
第2周波数変換部13は、2つのミキサ132及び134と、2つのバンドパスフィルタ(BPF)131及び133と、ローパスフィルタ135とを備え、2段階の周波数変換を行う。
FIG. 3 is a diagram illustrating a configuration of the second frequency conversion unit 13 according to the present embodiment.
The second frequency conversion unit 13 includes two mixers 132 and 134, two band pass filters (BPF) 131 and 133, and a low pass filter 135, and performs two-stage frequency conversion.

バンドパスフィルタ131によって不要波が除去されてRF2が取り出され、LO2と共にミキサ132に入力される。
2つのミキサ132及び134にそれぞれ供給される局部発振周波数は共通であってよく、この場合、1つのLOから分配されてもよい。出力周波数IF2は、「IF2=RF2−2×LO2」となり、左旋円偏波用のLOを従来技術の1/2の周波数にできる。
The unnecessary wave is removed by the band pass filter 131, and RF2 is extracted and input to the mixer 132 together with LO2.
The local oscillation frequencies supplied to the two mixers 132 and 134 may be common, and in this case, they may be distributed from one LO. The output frequency IF2 is “IF2 = RF2-2 × LO2”, and the LO for left-handed circularly polarized waves can be ½ that of the prior art.

ミキサ132からの出力側には、バンドパスフィルタ133が配置され、第2周波数変換部13は、LO2及びイメージ(RF2+LO2)を除去して、所望の出力(RF2−LO2)を取り出す。
また、ミキサ134からの出力側には、ローパスフィルタ135が配置され、第2周波数変換部13は、LO2及びイメージ(RF2−LO2+LO2)を除去して、所望の出力(IF2)を取り出す。
A band-pass filter 133 is disposed on the output side from the mixer 132, and the second frequency converter 13 removes LO2 and the image (RF2 + LO2), and takes out a desired output (RF2-LO2).
A low-pass filter 135 is disposed on the output side from the mixer 134, and the second frequency conversion unit 13 removes LO2 and the image (RF2-LO2 + LO2) and takes out a desired output (IF2).

ここで、比較のため、第2周波数変換部13による2段階の周波数変換を行わない場合の左旋円偏波用IFの生成例を説明する。   Here, for comparison, an example of generating the left-handed circularly polarized IF when the second frequency conversion unit 13 does not perform two-stage frequency conversion will be described.

図4は、本実施形態に係る2段階の周波数変換を行わない場合の第1の例を示す図である。
この例では、右旋円偏波用のLOの周波数として「LO1=10.678GHz」を用い、左旋円偏波用のLOの周波数として「LO2=9.603GHz」を用いている。
FIG. 4 is a diagram illustrating a first example when the two-stage frequency conversion according to the present embodiment is not performed.
In this example, “LO1 = 10.678 GHz” is used as the frequency of LO for right-handed circular polarization, and “LO2 = 9.603 GHz” is used as frequency of LO for left-handed circular polarization.

この場合、LO1とLO2の差の周波数成分「LO1−LO2=1075MHz」は、BS右旋IF(1032MHz〜1489MHz)に重なり、干渉してしまう。この結果、BS右旋円偏波による放送映像が乱れる等の不具合が生じる。   In this case, the frequency component “LO1-LO2 = 1075 MHz” of the difference between LO1 and LO2 overlaps and interferes with the BS right-handed IF (1032 MHz to 1489 MHz). As a result, problems such as disturbance of the broadcast video due to the BS right-handed circularly polarized wave occur.

図5は、本実施形態に係る2段階の周波数変換を行わない場合の第2の例を示す図である。
この例では、第1の例に比べて、左旋円偏波用のLOの周波数を高くし、「LO2=9.648GHz」を用いている。
FIG. 5 is a diagram illustrating a second example when the two-stage frequency conversion according to the present embodiment is not performed.
In this example, the frequency of LO for left-handed circularly polarized waves is made higher than in the first example, and “LO2 = 9.648 GHz” is used.

この場合、LO1とLO2の差の周波数成分「LO1−LO2=1030MHz」は、BS右旋IFよりも低域側となる。ところが、左旋円偏波用IFの周波数も低くなるため、BS左旋IFがCS右旋IFと10MHz差まで近づき、両者間のガードバンドが十分に確保できなくなる。   In this case, the frequency component “LO1-LO2 = 1030 MHz” of the difference between LO1 and LO2 is on the lower frequency side than the BS right-handed IF. However, since the frequency of the left-handed circularly polarized IF also becomes lower, the BS left-handed IF approaches 10 MHz difference from the CS right-handed IF, and a sufficient guard band cannot be secured between them.

図6は、本実施形態に係る2段階の周波数変換を行わない場合の第3の例を示す図である。
この例では、LO2を調整して、LO1−LO2の周波数をBS右旋IF内のチャンネル間に配置している。
FIG. 6 is a diagram illustrating a third example when the two-stage frequency conversion according to the present embodiment is not performed.
In this example, LO2 is adjusted, and the frequency of LO1-LO2 is arranged between the channels in the BS right-hand IF.

例えば、LO2=9.609GHzとすれば、LO1−LO2=1069MHzとなる。この結果、LOの周波数の差分の周波数成分を、BS右旋IFの1チャンネルと3チャンネルとの間に配置できる。なお、この方法では、LOの周波数の差分の周波数成分を、BS右旋のチャンネル番号(1,3,5,・・・,21,23)のうち、任意のチャンネル間に配置できる。   For example, if LO2 = 9.609 GHz, LO1−LO2 = 1069 MHz. As a result, the frequency component of the LO frequency difference can be arranged between the 1st and 3rd channels of the BS right-hand IF. In this method, the frequency component of the difference between the LO frequencies can be arranged between arbitrary channels among the BS right-handed channel numbers (1, 3, 5,..., 21, 23).

この場合、LO1−LO2の周波数から受信信号(IF)への干渉の影響は低減される。ところが、LO1−LO2の周波数成分は、BS右旋IFの帯域内にあることに変わりはなく、フィルタで除去することはできない。   In this case, the influence of interference from the frequency of LO1-LO2 to the received signal (IF) is reduced. However, the frequency components of LO1-LO2 remain in the band of BS right-handed IF, and cannot be removed by a filter.

よって、LO1−LO2の周波数成分の電力レベルをBS右旋IFの信号レベルよりも十分低くできない場合、後段のアンプが飽和する等の理由により、受信品質が劣化するおそれがある。   Therefore, when the power level of the frequency components of LO1 to LO2 cannot be sufficiently lower than the signal level of the BS right-handed IF, the reception quality may be deteriorated due to the saturation of the subsequent amplifier.

図7は、本実施形態に係る2段階の周波数変換を行った場合の右旋円偏波用IFの生成例を示す図である。   FIG. 7 is a diagram illustrating a generation example of the right-hand circularly polarized IF when the two-stage frequency conversion according to the present embodiment is performed.

2段階の周波数変換を行うことにより、LO2は、例えば上記の第1の例(図4)の1/2に設定される。このLO2(例えば、4.802GHz)は、いずれの放送波(衛星放送、地上TV、ケーブルTV)及びIF、さらには、1段階目の変換後の周波数帯にも干渉しない。
さらに、LO1−LO2の周波数(5.876GHz)も、いずれの放送波及びIF、さらには、1段階目の変換後の周波数帯にも干渉しない。
よって、これらの不要波は、フィルタにより除去可能であり、所望のIFのみを取り出すことが可能である。
By performing the two-stage frequency conversion, LO2 is set to ½ of the above first example (FIG. 4), for example. This LO2 (for example, 4.802 GHz) does not interfere with any broadcast wave (satellite broadcast, terrestrial TV, cable TV) and IF, and further, the frequency band after the first stage conversion.
Furthermore, the LO1-LO2 frequency (5.876 GHz) does not interfere with any broadcast wave and IF, and further, the frequency band after the first stage conversion.
Therefore, these unnecessary waves can be removed by a filter, and only a desired IF can be taken out.

本実施形態によれば、受信装置1は、左旋円偏波用の第2周波数変換部13にミキサを複数配置し多段階の周波数変換を行う。これにより、左旋円偏波用のLOの周波数が調整されるので、受信装置1は、2つのLOの周波数の差分の周波数成分を調整して、右旋円偏波用のIFに影響を与えることなく、左旋円偏波用のIFを生成できる。   According to the present embodiment, the receiving device 1 performs multistage frequency conversion by arranging a plurality of mixers in the second frequency conversion unit 13 for left-handed circular polarization. As a result, the frequency of the LO for left-handed circular polarization is adjusted, so that the receiving apparatus 1 adjusts the frequency component of the difference between the frequencies of the two LOs and affects the IF for right-handed circular polarization. Without generating a counterclockwise circularly polarized IF.

さらに、受信装置1は、前述のLO1及びLO2を用いて2段階の周波数変換を行うことにより、放送波(衛星放送、地上TV、ケーブルTV)、及び各周波数変換後の周波数帯のいずれに対しても、LOの周波数又はLOの周波数の差分が重畳せず、干渉を回避できる。
なお、右旋円偏波用及び左旋円偏波用それぞれのLOの周波数、及び2つのLOの周波数の差の周波数成分は、バンドパスフィルタ133及びローパスフィルタ135により除去可能である。
Furthermore, the receiving device 1 performs two-stage frequency conversion using the above-described LO1 and LO2, so that any one of the broadcast wave (satellite broadcast, terrestrial TV, cable TV) and the frequency band after each frequency conversion is performed. However, the LO frequency or the difference between the LO frequencies is not superimposed, and interference can be avoided.
Note that the frequency components of the difference between the frequencies of the LOs for right-handed circular polarization and left-handed circular polarization and the frequencies of the two LOs can be removed by the band-pass filter 133 and the low-pass filter 135.

また、2段階の周波数変換のそれぞれで使用されるLO2は共通化されるので、第2周波数変換部13は、単一の発振器により左旋円偏波に対して周波数変換処理を行える。
なお、受信装置1は、右旋円偏波について従来との整合性を保つので、回路や部品を共通化し、コストの低減を図ることができる。
Also, since LO2 used in each of the two stages of frequency conversion is shared, the second frequency conversion unit 13 can perform frequency conversion processing on the left-handed circularly polarized wave by a single oscillator.
In addition, since the receiving apparatus 1 maintains the consistency with the conventional about right-handed circularly polarized wave, it can aim at the reduction of cost by making a circuit and components common.

受信装置1は、左旋円偏波用IFの周波数範囲を右旋円偏波用IFより高域側に配置するので、地上TV、ケーブルTV及び右旋円偏波用IFに加え、左旋円偏波用IFについても、1本の同軸ケーブルで伝送され、宅内配線設備を簡素化することができるので、コスト低減につながると共に、既存配線の流用も可能になる。
また、受信装置1は、右旋及び左旋の両円偏波の衛星放送を同時に伝送できる。さらに、分配器を用いることにより、複数台の受信機(チューナ)でそれぞれ任意の放送を選択し受信できる。これにより、受信装置1は、例えば、ユーザが視聴中の番組とは別の番組を録画する等、柔軟な視聴環境を提供できる。
Since the receiving device 1 arranges the frequency range of the left-hand circularly polarized IF higher than the right-hand circularly polarized IF, in addition to the terrestrial TV, cable TV, and right-hand circularly polarized IF, the left-hand circularly polarized IF The wave IF is also transmitted through a single coaxial cable, and the in-house wiring facility can be simplified, leading to cost reduction and the use of existing wiring.
In addition, the receiving device 1 can simultaneously transmit both right-handed and left-handed circularly polarized satellite broadcasts. Furthermore, by using a distributor, an arbitrary broadcast can be selected and received by each of a plurality of receivers (tuners). Thereby, the receiving device 1 can provide a flexible viewing environment such as recording a program different from the program that the user is viewing.

なお、本実施形態におけるLO2(4.802GHz)と周波数変換後の左旋円偏波用IFとは一例であり、受信装置1は、LOの周波数及びその差分による干渉を回避するように周波数変換を行えばよい。変換演算の回数は2回には限られず、また、それぞれの演算で異なるLOの周波数が使用されてもよい。   Note that LO2 (4.802 GHz) and the left-handed circularly polarized IF after frequency conversion in this embodiment are examples, and the receiving apparatus 1 performs frequency conversion so as to avoid interference due to the LO frequency and its difference. Just do it. The number of conversion calculations is not limited to two, and different LO frequencies may be used for each calculation.

以上、本発明の実施形態について説明したが、本発明は前述した実施形態に限るものではない。また、本実施形態に記載された効果は、本発明から生じる最も好適な効果を列挙したに過ぎず、本発明による効果は、本実施形態に記載されたものに限定されるものではない。   As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. Further, the effects described in the present embodiment are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the present embodiment.

前述の実施形態では、主に受信装置の構成と動作について説明したが、本発明はこれに限られず、各構成要素を備え、衛星放送を受信するための方法、又はプログラムとして構成されてもよい。   In the above-described embodiment, the configuration and operation of the receiving apparatus have been mainly described. However, the present invention is not limited to this, and each of the components may be configured as a method or program for receiving satellite broadcasting. .

さらに、受信装置の機能を実現するためのプログラムをコンピュータで読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータシステムに読み込ませ、実行することによって実現してもよい。   Furthermore, the program for realizing the function of the receiving apparatus may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read into a computer system and executed.

ここでいう「コンピュータシステム」とは、OSや周辺機器等のハードウェアを含むものとする。また、「コンピュータで読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ROM、CD−ROM等の可搬媒体、コンピュータシステムに内蔵されるハードディスク等の記憶装置のことをいう。   The “computer system” here includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a hard disk built in the computer system.

さらに「コンピュータで読み取り可能な記録媒体」とは、インターネット等のネットワークや電話回線等の通信回線を介してプログラムを送信する場合の通信線のように、短時刻の間、動的にプログラムを保持するもの、その場合のサーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時刻プログラムを保持しているものも含んでもよい。また、上記プログラムは、前述した機能の一部を実現するためのものであってもよく、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるものであってもよい。   Furthermore, “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It is also possible to include one that holds a program for a certain time, such as a volatile memory inside a computer system that becomes a server or client in that case. Further, the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .

なお、受信装置1の適用場所に限定はない。例えば、受信装置1は、一般家庭住宅、集合住宅、オフィスビル、ホテル等さまざまな場所、施設に適用することができる。また、本願で用いた「宅内配線」という用語は、電気信号を伝達する用途で建物に配されている電気信号線の一例を示したものに過ぎず、何らの限定を意図する用語ではない。   In addition, there is no limitation in the application place of the receiver 1. FIG. For example, the receiving device 1 can be applied to various places and facilities such as ordinary homes, apartment houses, office buildings, hotels, and the like. Further, the term “in-house wiring” used in the present application is merely an example of an electric signal line arranged in a building for the purpose of transmitting an electric signal, and is not a term intended for any limitation.

1 受信装置
11 偏波分離部
12 第1周波数変換部
13 第2周波数変換部
14 合波器
15 混合器
DESCRIPTION OF SYMBOLS 1 Receiver 11 Polarization separation part 12 1st frequency conversion part 13 2nd frequency conversion part 14 Mux 15 Mixer

Claims (3)

アンテナにより受信された放送波を、右旋円偏波及び左旋円偏波に分離する偏波分離部と、
前記右旋円偏波に対して、第1局部発振周波数を減ずる第1演算により右旋中間周波へ周波数変換を行う第1周波数変換部と、
前記左旋円偏波に対して、第2局部発振周波数を減ずる第2演算を複数回行うことにより左旋中間周波へ周波数変換を行う第2周波数変換部と、
前記右旋中間周波及び前記左旋中間周波を合波する合波器と、を備える受信装置。
A polarization separation unit that separates a broadcast wave received by an antenna into a right-handed circularly polarized wave and a left-handed circularly polarized wave;
A first frequency converter for converting the right-handed circularly polarized wave into a right-handed intermediate frequency by a first calculation for reducing the first local oscillation frequency;
A second frequency conversion unit that performs frequency conversion to a left-handed intermediate frequency by performing a second calculation for reducing the second local oscillation frequency multiple times for the left-handed circularly polarized wave;
And a multiplexer that multiplexes the right-handed intermediate frequency and the left-handed intermediate frequency.
前記第2局部発振周波数、及び前記第1局部発振周波数と前記第2局部発振周波数との差の周波数は、前記第1演算又は前記第2演算により得られるいずれの中間周波の範囲にも含まれない請求項1に記載の受信装置。   The second local oscillation frequency and the difference frequency between the first local oscillation frequency and the second local oscillation frequency are included in any intermediate frequency range obtained by the first calculation or the second calculation. The receiving device according to claim 1. 前記第2周波数変換部は、前記左旋中間周波の周波数範囲を所定値以上にするための前記第2局部発振周波数を用いる請求項1に記載の受信装置。   The receiving apparatus according to claim 1, wherein the second frequency converter uses the second local oscillation frequency for setting a frequency range of the left-handed intermediate frequency to a predetermined value or more.
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Publication number Priority date Publication date Assignee Title
JP2017034589A (en) * 2015-08-05 2017-02-09 マスプロ電工株式会社 Frequency converter and antenna device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09182064A (en) * 1995-12-25 1997-07-11 Sony Corp Receiver, receiving method and terminal equipment
JP2006180024A (en) * 2004-12-21 2006-07-06 Dx Antenna Co Ltd Converter with a plurality of shared frequencies

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09182064A (en) * 1995-12-25 1997-07-11 Sony Corp Receiver, receiving method and terminal equipment
JP2006180024A (en) * 2004-12-21 2006-07-06 Dx Antenna Co Ltd Converter with a plurality of shared frequencies

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017034589A (en) * 2015-08-05 2017-02-09 マスプロ電工株式会社 Frequency converter and antenna device

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