JPH0865585A - Receiver - Google Patents
ReceiverInfo
- Publication number
- JPH0865585A JPH0865585A JP19930794A JP19930794A JPH0865585A JP H0865585 A JPH0865585 A JP H0865585A JP 19930794 A JP19930794 A JP 19930794A JP 19930794 A JP19930794 A JP 19930794A JP H0865585 A JPH0865585 A JP H0865585A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- mixer
- local oscillation
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、廉価な構成で得られ
る周波数安定度の高い局部発振信号を利用して安定な受
信が可能な受信機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver capable of stable reception by utilizing a locally oscillated signal having a high frequency stability obtained with an inexpensive structure.
【０００２】[0002]
【従来の技術】図２は、従来の技術によるスーパーヘテ
ロダイン方式を利用した受信機の構成を示している。2. Description of the Related Art FIG. 2 shows the structure of a receiver using a superheterodyne system according to the prior art.
【０００３】図２において、アンテナ１で受信された高
周波信号は、高周波増幅器２を介して混合器３の一方の
入力端子に供給される。混合器３の他方の入力端子に
は、局部発振器４から局部発振信号が供給される。In FIG. 2, a high frequency signal received by an antenna 1 is supplied to one input terminal of a mixer 3 via a high frequency amplifier 2. A local oscillation signal is supplied from the local oscillator 4 to the other input terminal of the mixer 3.
【０００４】混合器３からは、周知のように、高周波信
号の周波数と局部発振信号の周波数の差の周波数を有す
る中間周波信号が出力される。この中間周波信号が中間
周波増幅器５で増幅され、増幅後の中間周波信号が検波
器６で検波されることで、出力端子７に検波信号が得ら
れる。As is well known, the mixer 3 outputs an intermediate frequency signal having a frequency difference between the frequency of the high frequency signal and the frequency of the local oscillation signal. The intermediate frequency signal is amplified by the intermediate frequency amplifier 5, and the amplified intermediate frequency signal is detected by the detector 6, whereby a detection signal is obtained at the output terminal 7.
【０００５】[0005]
【発明が解決しようとする課題】ところで、図２例のよ
うなスーパーヘテロダイン方式を利用した受信機では、
局部発振器４から混合器３に供給される局部発振信号の
周波数の偏差（ゆらぎ）が少ないほど、得られる検波信
号がゆらぎの少ない良質な信号になる。By the way, in the receiver using the super-heterodyne system as shown in FIG.
The smaller the frequency deviation (fluctuation) of the local oscillation signal supplied from the local oscillator 4 to the mixer 3, the better the detection signal obtained is a good quality signal.
【０００６】局部発振器４として例えば水晶発振器を用
いた受信機は、水晶発振器が数百円程度で購入できるこ
とから安価に構成できる。しかし、水晶発振器の周波数
偏差は１０-4程度と比較的に大きいので、検波信号の品
質が比較的に低品質なものになってしまう。A receiver using, for example, a crystal oscillator as the local oscillator 4 can be inexpensively constructed because the crystal oscillator can be purchased for several hundred yen. However, since the frequency deviation of the crystal oscillator is relatively large at about 10 −4 , the quality of the detection signal becomes relatively low.
【０００７】一方、局部発振器４としてルビジウム発振
器を用いた受信機は、周波数偏差が１０-10 程度と極め
て少なく、ゆらぎの少ない高品質の検波信号が得られ
る。しかし、ルビジウム発振器の価格が数百万円程度す
るので、これを用いた受信機は高価にならざるを得な
い。On the other hand, a receiver using a rubidium oscillator as the local oscillator 4 has a very small frequency deviation of about 10 -10 and can obtain a high quality detection signal with little fluctuation. However, since the price of the rubidium oscillator is about several million yen, the receiver using this is inevitably expensive.
【０００８】なお、温度補償を行った水晶発振器を用い
ることも考えられるが、価格的には、ルビジウム発振器
に比較して安価であるがルビジウム発振器に比較して周
波数偏差が大きいので、それほど良質の検波信号を得る
ことができない。Although it is conceivable to use a temperature-compensated crystal oscillator, it is cheaper than a rubidium oscillator, but has a large frequency deviation as compared to a rubidium oscillator, so that it is of a very good quality. No detection signal can be obtained.
【０００９】この発明はこのような課題を考慮してなさ
れたものであり、ゆらぎの少ない高品質の検波信号が得
られる廉価な受信機を提供することを目的とする。The present invention has been made in view of the above problems, and an object thereof is to provide an inexpensive receiver which can obtain a high-quality detection signal with little fluctuation.
【００１０】[0010]
【課題を解決するための手段】この発明は、例えば、図
１に示すように、アンテナ１により受信された信号と局
部発振信号ＳＬとを混合器３で混合して中間周波信号を
得、この中間周波信号を検波器６により検波して検波信
号ＳＤを得る受信機において、テレビ信号受信部１１
と、このテレビ信号受信部１１から出力される色副搬送
波信号ＳＣの周波数を逓倍もしくは分周して所望の周波
数の局部発振信号ＳＬに変える周波数逓倍・分周器１２
とを備え、前記所望の周波数の局部発振信号ＳＬを混合
器３用の局部発振信号ＳＬとして使用することを特徴と
する。According to the present invention, for example, as shown in FIG. 1, a signal received by an antenna 1 and a local oscillation signal SL are mixed by a mixer 3 to obtain an intermediate frequency signal. In the receiver for detecting the intermediate frequency signal by the wave detector 6 to obtain the detected signal SD, the television signal receiving unit 11
And a frequency multiplier / divider 12 that multiplies or divides the frequency of the color subcarrier signal SC output from the television signal receiving unit 11 to change it to a local oscillation signal SL of a desired frequency.
And the local oscillation signal SL having the desired frequency is used as the local oscillation signal SL for the mixer 3.
【００１１】[0011]
【作用】この発明によれば、テレビ信号受信部から出力
される色副搬送波信号の周波数を周波数逓倍・分周器に
より所望の周波数の局部発振信号に変えて出力し、この
所望の周波数の局部発振信号を混合器用の局部発振信号
として使用している。According to the present invention, the frequency of the color subcarrier signal output from the television signal receiving section is converted into a local oscillation signal of a desired frequency by the frequency multiplier / divider and then output, and the local frequency of the desired frequency is output. The oscillation signal is used as the local oscillation signal for the mixer.
【００１２】[0012]
【実施例】以下、この発明の一実施例について図面を参
照して説明する。なお、以下に参照する図面において、
上記図２に示したものと対応するものには同一の符号を
付けてその詳細な説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the drawings referred to below,
Components corresponding to those shown in FIG. 2 are designated by the same reference numerals, and detailed description thereof will be omitted.
【００１３】図１は、この実施例の受信機の構成を示し
ている。FIG. 1 shows the configuration of the receiver of this embodiment.
【００１４】この図１例の受信機は、基本的に、色副搬
送波信号ＳＣを出力するテレビ信号受信部１１と、テレ
ビ信号受信部１１から出力される色副搬送波信号ＳＣの
周波数を逓倍もしくは分周して所望の周波数を有する局
部発振信号ＳＬを出力する周波数逓倍・分周器１２と、
検波信号ＳＤを出力するスーパーヘテロダイン受信部１
３とを備えている。The receiver shown in FIG. 1 basically has a television signal receiving section 11 that outputs a color subcarrier signal SC and a frequency of the color subcarrier signal SC that is output from the television signal receiving section 11. A frequency multiplier / divider 12 that divides and outputs a local oscillation signal SL having a desired frequency;
Superheterodyne receiver 1 that outputs a detection signal SD
3 and 3.
【００１５】テレビ信号受信部１１は、市販のテレビ受
信機を流用したものである。したがって、数万円程度以
下の価格で購入することができる。このテレビ信号受信
部１１の構成・作用は周知のものであるので、簡単に説
明する。The television signal receiver 11 is a commercially available television receiver. Therefore, it can be purchased at a price of tens of thousands of yen or less. The configuration and operation of the television signal receiving section 11 are well known, and will be briefly described.
【００１６】アンテナ２１で受信された地上波信号は、
選局回路２２によって制御される高周波増幅器２３を介
して混合器２４の一方の入力端子に供給される。混合器
２４の他方の入力端子には、選局回路２２でその発振周
波数が制御される局部発振器２５からの局部発振信号が
供給される。The terrestrial signal received by the antenna 21 is
It is supplied to one input terminal of the mixer 24 via the high frequency amplifier 23 controlled by the tuning circuit 22. The other input terminal of the mixer 24 is supplied with a local oscillation signal from a local oscillator 25 whose oscillation frequency is controlled by the tuning circuit 22.
【００１７】混合器２４の出力側には映像中間周波信号
が得られ、得られた映像中間周波信号が中間周波増幅器
２７、映像検波器２８を介して複合映像信号ＣＶにされ
る。A video intermediate frequency signal is obtained at the output side of the mixer 24, and the obtained video intermediate frequency signal is converted into a composite video signal CV via an intermediate frequency amplifier 27 and a video detector 28.
【００１８】この複合映像信号ＣＶから帯域通過フィル
タ２９によりバースト信号が抽出され、このバースト信
号が必要に応じて増幅された後、色同期回路３０におい
て、繰返し連続信号としての色副搬送波信号ＳＣにされ
る。A burst signal is extracted from the composite video signal CV by a bandpass filter 29, the burst signal is amplified as necessary, and then, in a color synchronizing circuit 30, a color subcarrier signal SC as a repetitive continuous signal is obtained. To be done.
【００１９】この色副搬送波信号ＳＣの周波数偏差は、
テレビ送信局が鮮明なカラー画像をテレビ受信機に送る
ため、色副搬送波信号ＳＣの発生に極めて周波数偏差の
少ないルビジウム発振器あるいはさらに偏差の少ないセ
シウム発振器を用いていることから極めて小さい値にな
っている。実際、電子情報通信学会誌には、郵政省通信
総合研究所標準測定部周波数標準課の測定結果が報告さ
れており、例えば、電子情報通信学会誌１９９４年１月
号の９５頁には１０-10 以下の周波数偏差であることが
報告がされている。The frequency deviation of this color subcarrier signal SC is
Since the television transmitting station sends a clear color image to the television receiver, the value is extremely small because a rubidium oscillator with a very small frequency deviation or a cesium oscillator with a smaller deviation is used to generate the color subcarrier signal SC. There is. In fact, electronic information to the communication Journal is reporting the measurement results of the Ministry of Posts and Telecommunications Communications Research Laboratory standard measurement unit frequency standard Division, for example, in the 95 pages of the Institute of Electronics, Information and Communication Engineers Journal, 1994 January 10 - It has been reported that the frequency deviation is 10 or less.
【００２０】なお、色同期回路３０の出力側に現れる色
副搬送波信号ＳＣの良質なものを選択するためには、選
局回路２２でチャンネルを変更し、強い電波を受信する
ようにすればよい。In order to select a high-quality color subcarrier signal SC appearing on the output side of the color synchronization circuit 30, the channel selection circuit 22 may change the channel so that strong radio waves are received. .
【００２１】色副搬送波信号ＳＣは、ＰＬＬを利用した
周波数逓倍・分周器１２で所望の周波数を有する局部発
振信号ＳＬに逓倍もしくは分周され、スーパーヘテロダ
イン受信部１３の混合器３の一方の入力端子に供給され
る。The color subcarrier signal SC is multiplied or divided into a local oscillation signal SL having a desired frequency by a frequency multiplier / divider 12 using a PLL, and one of the mixers 3 of the superheterodyne receiver 13 is supplied. It is supplied to the input terminal.
【００２２】混合器３の他方の入力端子には、アンテナ
１で受信された高周波信号が、高周波増幅器２を介して
供給される。The high frequency signal received by the antenna 1 is supplied to the other input terminal of the mixer 3 through the high frequency amplifier 2.
【００２３】混合器３からは、高周波信号の周波数と局
部発振信号ＳＬの周波数の差の周波数を有する中間周波
信号が出力される。この中間周波信号が中間周波増幅器
５で増幅され、増幅後の中間周波信号が検波器６で検波
されることで、出力端子７に検波信号ＳＤが得られる。The mixer 3 outputs an intermediate frequency signal having a frequency that is the difference between the frequency of the high frequency signal and the frequency of the local oscillation signal SL. The intermediate frequency signal is amplified by the intermediate frequency amplifier 5, and the amplified intermediate frequency signal is detected by the detector 6, whereby a detection signal SD is obtained at the output terminal 7.
【００２４】この検波信号ＳＤの周波数偏差は、局部発
振信号ＳＬの周波数偏差が相当に小さいことから、きわ
めて小さい。したがって、ゆらぎの少ない高品質の検波
信号ＳＤが得られることになる。なお、周波数逓倍・分
周器１２を逓倍器とするのか、もしくは分周器とするの
かの選択は、混合器３で得ようとする所望の中間周波信
号の周波数と高周波増幅器２の出力側に得られる高周波
信号の周波数との関係で決定される。The frequency deviation of the detection signal SD is extremely small because the frequency deviation of the local oscillation signal SL is considerably small. Therefore, a high quality detection signal SD with less fluctuation can be obtained. It should be noted that the selection of whether the frequency multiplier / divider 12 is a multiplier or a frequency divider is performed depending on the frequency of the desired intermediate frequency signal to be obtained by the mixer 3 and the output side of the high frequency amplifier 2. It is determined in relation to the frequency of the obtained high frequency signal.
【００２５】このように、上述の実施例によれば、テレ
ビ信号受信部１１から得られる再生された色副搬送波信
号ＳＣの周波数の逓倍信号をスーパーヘテロダイン受信
部１３の局部発振信号ＳＬとして用いている。このよう
にして作成した局部発振信号ＳＬの波数安定度は、極め
て高く、したがって、図１例の受信機は、廉価であるに
もかかわらず、安定な受信が可能である。As described above, according to the above-described embodiment, the frequency-multiplied signal of the reproduced color subcarrier signal SC obtained from the television signal receiving section 11 is used as the local oscillation signal SL of the superheterodyne receiving section 13. There is. The wavenumber stability of the local oscillation signal SL created in this way is extremely high. Therefore, the receiver of the example of FIG. 1 is capable of stable reception although it is inexpensive.
【００２６】なお、上述の実施例において、テレビ信号
受信部１１は、地上波用のテレビ信号受信部を用いてい
るが、これに限らず、衛星放送用の受信部等を用いるこ
ともできる。 また、この発明は上述の実施例に限ら
ず、この発明の要旨を逸脱することなく種々の構成を採
り得ることはもちろんである。In the above-mentioned embodiment, the television signal receiving section 11 uses a terrestrial television signal receiving section, but not limited to this, a satellite broadcasting receiving section or the like may be used. Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.
【００２７】[0027]
【発明の効果】以上説明したように、この発明によれ
ば、テレビ信号受信部から出力される色副搬送波信号の
周波数を周波数逓倍・分周器により所望の周波数の局部
発振信号に変えて出力し、この所望の周波数の局部発振
信号を混合器用の局部発振信号として使用している。色
副搬送波信号の周波数偏差が極めて小さいため、ゆらぎ
の少ない高品質の検波信号が得られる廉価な受信機を構
成することができる。言い換えれば、安定な受信が可能
な受信機を廉価に製作することができる。As described above, according to the present invention, the frequency of the color subcarrier signal output from the television signal receiving section is converted into the local oscillation signal of a desired frequency by the frequency multiplier / divider and output. However, the local oscillation signal of this desired frequency is used as the local oscillation signal for the mixer. Since the frequency deviation of the color subcarrier signal is extremely small, it is possible to configure an inexpensive receiver that can obtain a high quality detection signal with little fluctuation. In other words, a receiver capable of stable reception can be manufactured at low cost.
【図１】この発明の一実施例の構成を示すブロック図で
ある。FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
【図２】従来の技術の構成を示すブロック図である。FIG. 2 is a block diagram showing a configuration of a conventional technique.
１…アンテナ ２…高周波増幅器 ３…混合器 ５…中間周波増幅
器 ６…検波器 １１…テレビ信号
受信部 １２…周波数逓倍・分周器 ２５…局部発振器 ２８…映像検波器 ３０…色同期回路 ＣＶ…複合映像信号 ＳＣ…色副搬送波
信号 ＳＤ…検波信号 ＳＬ…局部発振信
号1 ... Antenna 2 ... High frequency amplifier 3 ... Mixer 5 ... Intermediate frequency amplifier 6 ... Detector 11 ... Television signal receiver 12 ... Frequency multiplier / divider 25 ... Local oscillator 28 ... Video detector 30 ... Color synchronization circuit CV ... Composite video signal SC ... Color subcarrier signal SD ... Detection signal SL ... Local oscillation signal
Claims (1)
信号とを混合器で混合して中間周波信号を得、この中間
周波信号を検波器により検波して検波信号を得る受信機
において、 テレビ信号受信部と、 このテレビ信号受信部から出力される色副搬送波信号の
周波数を逓倍もしくは分周して所望の周波数の局部発振
信号に変える周波数逓倍・分周器とを備え、 前記所望の周波数の局部発振信号を前記混合器用の前記
局部発振信号として使用することを特徴とする受信機。1. A television signal in a receiver for mixing a signal received by an antenna and a local oscillation signal by a mixer to obtain an intermediate frequency signal and detecting the intermediate frequency signal by a detector. A receiver and a frequency multiplier / divider that multiplies or divides the frequency of the color subcarrier signal output from the television signal receiver to change it to a local oscillation signal of a desired frequency. A receiver using a local oscillator signal as the local oscillator signal for the mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19930794A JPH0865585A (en) | 1994-08-24 | 1994-08-24 | Receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19930794A JPH0865585A (en) | 1994-08-24 | 1994-08-24 | Receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0865585A true JPH0865585A (en) | 1996-03-08 |
Family
ID=16405631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19930794A Pending JPH0865585A (en) | 1994-08-24 | 1994-08-24 | Receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0865585A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041023A (en) * | 2001-05-08 | 2009-02-26 | Merck Patent Gmbh | Polymerizable liquid crystal material |
-
1994
- 1994-08-24 JP JP19930794A patent/JPH0865585A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009041023A (en) * | 2001-05-08 | 2009-02-26 | Merck Patent Gmbh | Polymerizable liquid crystal material |
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