JPS586427B2 - Noise temperature warmer - Google Patents
Noise temperature warmerInfo
- Publication number
- JPS586427B2 JPS586427B2 JP50107379A JP10737975A JPS586427B2 JP S586427 B2 JPS586427 B2 JP S586427B2 JP 50107379 A JP50107379 A JP 50107379A JP 10737975 A JP10737975 A JP 10737975A JP S586427 B2 JPS586427 B2 JP S586427B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- noise
- diode
- video signal
- capacitor
- 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.)
- Expired
Links
Landscapes
- Picture Signal Circuits (AREA)
- Noise Elimination (AREA)
Description
【発明の詳細な説明】
本発明はテレビジョン受像機にて受信された合成映像信
号中のノイズを抽出するノイズ抽出回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise extraction circuit that extracts noise from a composite video signal received by a television receiver.
カラーテレビジョン受像機にて弱電界の電波を受信する
場合は、Ｓ／Ｎが少さいので合成映像信号中のノイズに
よって帯域増巾回路が飽和し、いわゆる横引きノイズが
発生して画質が低下する。When receiving weak electric field radio waves with a color television receiver, the S/N ratio is low, so noise in the composite video signal saturates the band amplification circuit, causing so-called horizontal noise, which degrades the image quality. do.
又、一方検波された映像信号にその映像信号の二次微分
出力を加えることによシ、画像の輪郭をはつきりさせる
ようにした輪郭補正回路を設けたテレビジョン受像機に
於では、弱電界の電波を受信する場合、その輪郭補正回
路の存在忙よって、反って画面のノイズが強調されてし
まう。In addition, in television receivers equipped with a contour correction circuit that sharpens the contours of the image by adding the second-order differential output of the video signal to the detected video signal, When receiving electric field radio waves, the presence of the contour correction circuit causes distortion and emphasizes noise on the screen.
そこで、受信された映像信号中よりノイズを抽出し、そ
のレベルに応じて何らかの対策を講じなければならない
。Therefore, it is necessary to extract the noise from the received video signal and take some countermeasures depending on its level.
ところで、従来のノイズ抽出回路では、合成映像信号中
の水平同期信号部分のノイズを抽出することによって、
合成映像信号全体のノイズレベルを検出するようにして
いたが、その場合、水平同期信号部分から作った抜き取
りパルスによって合成映像信号中の水平同期信号部分の
ノイズを抽出するようにしていた。By the way, in conventional noise extraction circuits, by extracting the noise in the horizontal synchronization signal part of the composite video signal,
The noise level of the entire composite video signal was detected, but in that case, the noise in the horizontal synchronization signal portion of the composite video signal was extracted using a sampling pulse created from the horizontal synchronization signal portion.
しかしながら、これは回路が複雑となるという欠点があ
った。However, this has the disadvantage that the circuit becomes complicated.
斯る点に鑑み、本発明はとのような合成映像信号中の同
期信号部分に於けるノイズを簡単な回路をもって有効に
抽出することの出来るノイズ抽出回路を提案せんとする
ものである。In view of this, the present invention proposes a noise extraction circuit that can effectively extract noise in the synchronization signal portion of a composite video signal using a simple circuit.
本発明によるノイズ抽出回路は合成映像信号の供給され
る入力端子がコンデンサを通じてダイオードの一方の電
極に接続され、コンデンサとダイオードとの接続中点と
基準電位点との間に放電用抵抗器が接続され、ダイオー
ドの他方の電極がインダクタを通じて基準電位点に接続
され、ダイオードとインダクタンスとの接続中点より合
成映像信号の同期信号部分に混入せるノイズを出力とし
て抽出するようにして構成したものである。In the noise extraction circuit according to the present invention, an input terminal to which a composite video signal is supplied is connected to one electrode of a diode through a capacitor, and a discharging resistor is connected between a midpoint between the capacitor and the diode and a reference potential point. The other electrode of the diode is connected to a reference potential point through an inductor, and the noise to be mixed into the synchronization signal part of the composite video signal is extracted as an output from the midpoint of the connection between the diode and the inductance. .
以下に、第１図を参照して、本発明ノイズ抽出回路をカ
ラーテレビジョン映像機に適用した場合の一例について
詳細に説明する。Hereinafter, with reference to FIG. 1, an example in which the noise extraction circuit of the present invention is applied to a color television video machine will be described in detail.
第１図に於で、１は受信アンテナ、２は高周波増巾回路
、３は混合回路、４は局部発振回路、５は中間周波増巾
回路、６は映像検波回路、γは映像増巾回路である。In Figure 1, 1 is a receiving antenna, 2 is a high frequency amplification circuit, 3 is a mixing circuit, 4 is a local oscillation circuit, 5 is an intermediate frequency amplification circuit, 6 is a video detection circuit, and γ is a video amplification circuit. It is.
８は輪郭補正回路であって、映像増巾回路７の出力が供
給されるもので、映像増巾回路７の出力たる映像信号の
供給される二次微分回路９と、この二次微分回路９の出
力を増巾する増巾回路１０と、この増巾回路１０の出力
と映像増巾回路７の出力とを加算する加算回路１１とか
ら構成されている。Reference numeral 8 denotes a contour correction circuit to which the output of the video amplification circuit 7 is supplied; The video amplifying circuit 10 includes an amplifying circuit 10 that amplifies the output of the amplifying circuit 10, and an adder circuit 11 that adds the output of the amplifying circuit 10 and the output of the video amplifying circuit 7.
１２．１３及び１４は色マト９クス・増巾回路で輪郭補
正回路８を通じて得られた映像信号がこれらに供給され
る。12, 13 and 14 are color matrix 9x/enlargement circuits to which the video signal obtained through the contour correction circuit 8 is supplied.
１５はカラー陰極線管で、これは色マトリクス・増巾回
路の出力がその電子銃のカソードあるいはグリットに供
給されるようになされている。15 is a color cathode ray tube in which the output of a color matrix/amplification circuit is supplied to the cathode or grid of the electron gun.
１６は映像検波回路６の出力の供給される色信号抽出用
トランス、１７は第１帯域増巾回路、１８は第２帯域増
巾回路、１９はバースト信号分離用の帯域通過沖波器、
２０Ｉ／′ｉバースト増巾回路、２１は局部副搬送波発
振器、２２は色復調回路である。16 is a color signal extraction transformer to which the output of the video detection circuit 6 is supplied; 17 is a first band amplification circuit; 18 is a second band amplification circuit; 19 is a bandpass transducer for burst signal separation;
20 is an I/'i burst amplification circuit, 21 is a local subcarrier oscillator, and 22 is a color demodulation circuit.
そして、色復調回路２２の出力が上述の各色マトリック
ス・増巾回路１２．１３及び１４に供給されるようにな
されている。The output of the color demodulation circuit 22 is supplied to each color matrix/amplification circuit 12, 13, and 14 described above.
以上の回路構成は従来のカラーテレビジョン受像機の構
成と同様であるので、之以上の詳細な説明は省略する。Since the circuit configuration described above is similar to that of a conventional color television receiver, detailed explanation thereof will be omitted.
２３が本発明によるノイズ抽出回路であって、ｔは映像
検波回路６からの合成映像信号の供給される入力端子で
ある。23 is a noise extraction circuit according to the present invention, and t is an input terminal to which a composite video signal from the video detection circuit 6 is supplied.
映像検波回路６の出力が抵抗器２８を通じてとの入力端
子ｔに接続される。The output of the video detection circuit 6 is connected through a resistor 28 to an input terminal t.
この入力端子ｔはコンデンサ２９を通じてダイオード３
１の一方の電極、この場合はカソードに接続される。This input terminal t is connected to the diode 3 through the capacitor 29.
1, in this case the cathode.
そして、コンデンサ２９とダイオード３１との接続中点
が放電用抵抗器３０を通じて基準電位点、この場合は電
源電位例えば１８Ｖの点、即ち電源＋Ｂ１＝抵抗器２６
及びコンデンサ２７よりなるデカツプリング回路を通じ
て接続される。Then, the midpoint of the connection between the capacitor 29 and the diode 31 is connected to the reference potential point through the discharging resistor 30, in this case the power supply potential, for example, 18V, that is, the power supply +B1 = resistor 26.
and a capacitor 27 through a decoupling circuit.
そして、ダイオード３１の他方の電極、即ちアノードが
インダクタ（コイル）３２を通じて同様に基準電位点に
接続される。The other electrode of the diode 31, that is, the anode, is similarly connected to the reference potential point through an inductor (coil) 32.
そして、ダイオード３１とインダクタ３２との接続中点
よシ合成映像信号の同期信号、即ち、水平同期信号部分
に混入せるノイズが出力として抽出される。Then, noise to be mixed into the synchronization signal of the composite video signal, that is, the horizontal synchronization signal portion, is extracted as an output from the midpoint of the connection between the diode 31 and the inductor 32.
即ち、入力端子ｔには第２図Ａに示す如き、ノイズを含
んだ合成映像信号が供給された場合、この回路に於て、
水平同期信号の尖頭電圧は基準電位即ち、この場合は１
８Ｖにクランプされる。That is, when a synthesized video signal containing noise as shown in FIG. 2A is supplied to the input terminal t, in this circuit,
The peak voltage of the horizontal synchronization signal is the reference potential, that is, 1 in this case.
Clamped to 8V.
ところがノイズ信分け周波数が高いのでインダク３３２
はこれに対し、高インピーダンスを呈するために、ダイ
オード３１及びインダクタ３２の接続中点には第２図Ｂ
に示す如き水平同期信号部分のノイズが抽出される。However, since the noise signal separation frequency is high, the inductor 332
On the other hand, in order to exhibit high impedance, there is a connection point between the diode 31 and the inductor 32 in Fig. 2B.
The noise in the horizontal synchronization signal portion as shown in is extracted.
斯くして、このノイズはコンデンサ３３を介して、ノイ
ズ増巾回路２４に供給されて増巾される。This noise is thus supplied to the noise amplification circuit 24 via the capacitor 33 and amplified.
このノイズ増巾回路はトランジスタ３９、ペースバイテ
ス用抵抗器３４及び３５、コレクタ負荷抵抗器３６及び
エミツタ抵抗器３８から構成されている。This noise amplification circuit is composed of a transistor 39, pacebite resistors 34 and 35, a collector load resistor 36, and an emitter resistor 38.
そして、トランジスタ３９のコレクタに増巾されたノイ
ズが出力され、之がコンデンサ４０を介して検波・増巾
回路２５に供給される。Then, the amplified noise is output to the collector of the transistor 39, and is supplied to the detection/amplification circuit 25 via the capacitor 40.
この検波・増巾回路２５に於では、そのノイズをトラン
ジスタ４２０ベース・エミツタ接合によって検波すると
共に、トランジスタにて増巾するもので、トランジスタ
４２、抵抗器４１及びコンデンサ４３からなっている。The detection/amplification circuit 25 detects the noise using the base-emitter junction of a transistor 420 and amplifies it using a transistor, and is made up of a transistor 42, a resistor 41, and a capacitor 43.
抵抗器４１はトランジスタ４２のベースとエミツタとの
間に接続され、コンデンサ４３はそのコレクタと接地と
の間に接続されている。A resistor 41 is connected between the base and emitter of transistor 42, and a capacitor 43 is connected between its collector and ground.
そして、この検波・増巾回路２５によってノイズが整流
されて直流化され、これが、ダイオード４４及び抵抗器
４５の直列回路を通じて帯域増巾回路の一方、この場合
は第２帯域増巾回路１８に利得制御信号として供給され
ると共に、ダイオード４６及び抵抗器４７の直列回路を
通じて輪郭補正回路８の増巾回路１０に利得制御信号と
して供給される。Then, the noise is rectified into direct current by this detection/amplification circuit 25, and this is passed through a series circuit of a diode 44 and a resistor 45 to one of the band amplification circuits, in this case, the second band amplification circuit 18, to gain gain. It is supplied as a control signal, and is also supplied as a gain control signal to the amplification circuit 10 of the contour correction circuit 8 through a series circuit of a diode 46 and a resistor 47.
そしてノイズレベルが大きい時には、増巾回路１８及び
１０の利得を下げるように利得制御信号がこれら増巾回
路１８及び１０に供給される。When the noise level is high, a gain control signal is supplied to the amplifier circuits 18 and 10 so as to lower their gains.
斯くして、このカラーテレビジョン受像器によれば、弱
電界に於ける受信信号の場合には、帯域増中回路１８の
利得が下げられるので、上述した如き画面に於けるカラ
ーの横引きノイズの発生が回避されると共に、輪郭補正
回路８の補正作用が弱められて、画面のノイズの強調が
回避され、夫夫画面の画質の改善に資することになる。According to this color television receiver, the gain of the band increaser circuit 18 is lowered in the case of a received signal in a weak electric field, so that the horizontal color noise on the screen as described above is reduced. In addition, the correction effect of the contour correction circuit 8 is weakened, and enhancement of screen noise is avoided, which contributes to improving the image quality of the screen.
上述の例に於ては、ノイズ抽出回路の基準電位点を電源
電位にとったが、これを接地電位にとってもよく、その
場合には供給される合成映像信号の極性が負極性となり
、且つ、ダイオードの極性が反対となる。In the above example, the reference potential point of the noise extraction circuit is set to the power supply potential, but it may also be set to the ground potential. In that case, the polarity of the composite video signal supplied will be negative, and The polarity of the diodes is reversed.
上述せる、本発明ノイズ抽出回路によれば、コンデンサ
、抵抗器、ダイオード及びインダクタよりなる簡単な回
路構成をもって合成映像信号中のノイズを抽出すること
ができる。According to the noise extraction circuit of the present invention described above, noise in a composite video signal can be extracted with a simple circuit configuration consisting of a capacitor, a resistor, a diode, and an inductor.
又、このノイズ抽出回路の出力によって、ノイズレベル
に応じて帯域増巾回路の利得を制御することによって、
弱電界の電波の受信による横引きノイズを有効に回避す
ることが出来、又、このノイズレベルに応じて輪郭補正
回路を制御することによって、輪郭補正回路の動作によ
る画面のノイズの強調を回避することが出来る。Also, by controlling the gain of the band amplification circuit according to the noise level using the output of this noise extraction circuit,
It is possible to effectively avoid side-scanning noise due to the reception of weak electric field radio waves, and by controlling the contour correction circuit according to this noise level, it is possible to avoid enhancement of screen noise due to the operation of the contour correction circuit. I can do it.
第１図は本発明ノイズ抽出回路を適用したカラーテレビ
ジョン受像機の一例を示すブロック線図、第２図はその
説明に供する波形図である。
８は輪郭補正回路、９は二次微分回路、１０は増巾回路
、１１は加算回路、１７は第１帯域増巾回路、１８は第
２帯域増巾回路、２３はノイズ抽出回路、２９はそのコ
ンデンサ、３０は抵抗器、３１はダイオード、３２はイ
ンダクタ（コイル）である。FIG. 1 is a block diagram showing an example of a color television receiver to which the noise extraction circuit of the present invention is applied, and FIG. 2 is a waveform diagram for explaining the same. 8 is a contour correction circuit, 9 is a second-order differential circuit, 10 is an amplification circuit, 11 is an addition circuit, 17 is a first band amplification circuit, 18 is a second band amplification circuit, 23 is a noise extraction circuit, and 29 is a In the capacitor, 30 is a resistor, 31 is a diode, and 32 is an inductor (coil).
Claims (1)
通じてタイオードの一方の電極に接続され上記コンデン
サと上記ダイオードとの接続中点と基準電位点との間に
放電用抵抗器が接続され、上記ダイオードの他方の電極
がインダクタを通じて上記基準電位点に接続され、上記
ダイオードと上記インダクタとの接続中点より上記合成
映像信号の同期信号部分に混入せるノイズを出力として
抽出するようにして成るノイズ抽出回路。1. An input terminal to which a composite video signal is supplied is connected to one electrode of a diode through a capacitor, and a discharging resistor is connected between the midpoint of connection between the capacitor and the diode and a reference potential point, and the voltage of the diode is The other electrode is connected to the reference potential point through an inductor, and the noise extraction circuit extracts as an output noise to be mixed into the synchronization signal portion of the composite video signal from the midpoint of connection between the diode and the inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50107379A JPS586427B2 (en) | 1975-09-04 | 1975-09-04 | Noise temperature warmer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50107379A JPS586427B2 (en) | 1975-09-04 | 1975-09-04 | Noise temperature warmer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5230323A JPS5230323A (en) | 1977-03-08 |
| JPS586427B2 true JPS586427B2 (en) | 1983-02-04 |
Family
ID=14457609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50107379A Expired JPS586427B2 (en) | 1975-09-04 | 1975-09-04 | Noise temperature warmer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS586427B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0322426U (en) * | 1989-07-14 | 1991-03-07 | ||
| JPH0425314U (en) * | 1990-06-22 | 1992-02-28 | ||
| WO2020013311A1 (en) | 2018-07-13 | 2020-01-16 | 大黒屋グループ株式会社 | Insole and shoe equipped with same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07105748B2 (en) * | 1988-06-17 | 1995-11-13 | 日本電気株式会社 | Duplex power supply circuit |
-
1975
- 1975-09-04 JP JP50107379A patent/JPS586427B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0322426U (en) * | 1989-07-14 | 1991-03-07 | ||
| JPH0425314U (en) * | 1990-06-22 | 1992-02-28 | ||
| WO2020013311A1 (en) | 2018-07-13 | 2020-01-16 | 大黒屋グループ株式会社 | Insole and shoe equipped with same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5230323A (en) | 1977-03-08 |
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