JPS5844876A - Frequency characteristic compensator - Google Patents
Frequency characteristic compensatorInfo
- Publication number
- JPS5844876A JPS5844876A JP14364681A JP14364681A JPS5844876A JP S5844876 A JPS5844876 A JP S5844876A JP 14364681 A JP14364681 A JP 14364681A JP 14364681 A JP14364681 A JP 14364681A JP S5844876 A JPS5844876 A JP S5844876A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- frequency
- capacitor
- transistor
- ntsc
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/642—Multi-standard receivers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Color Television Systems (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はカラーテレビジョン受像機に用いる周波数′１
１性補償回蕗に関するものであり、ＶＩＰ信号処理のＩ
Ｃからの映像検波出力が２■ｐ−ｐの負極性の信号で、
その周波数特性がＰＡＬ信号受信の場合４．４．３ Ｍ
Ｔ−Ｉｚ４だ、ＮＴＳＣ信号受信の場合３、５８ Ｍ］
ＩＺで０〜１ＭＨ２の信号に対して６ ｄＢおちている
場合テレビとビデオ信号切換え回路へその映像検波出力
を入力するとき、その振幅を６ｄＢおとして、且つ、負
極性の捷ま周波数特性をＰＡＬ方式の場合４．４３ Ｍ
Ｈｚまた、ＮＴＳＣ方式の場合３、５８ ＭＴ■ｚで６
ｄＢ持ち上げてフラットな周波数特性にするものを目
的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the frequency '1 used in a color television receiver.
It is related to the unisexual compensation cycle, and is the I of VIP signal processing.
The video detection output from C is a negative polarity signal of 2p-p,
If the frequency characteristic is PAL signal reception, it is 4.4.3 M.
T-Iz4, 3.58 M for NTSC signal reception]
If the IZ signal is 6 dB lower than the 0 to 1 MH2 signal, when inputting the video detection output to the TV and video signal switching circuit, reduce the amplitude by 6 dB and change the negative polarity frequency characteristic to PAL. 4.43 M in case of method
Hz, 3 for NTSC system, 6 for 58 MT
The purpose is to raise the frequency characteristics by dB and make the frequency characteristics flat.
周波数特性を変化させる理由は外部ＶＴ’Ｒへ出力する
映像検波出力の周波数特性が色副搬送波の周波数１でフ
ラットな特性にするとともにその周波数特性をＰ Ａ
ＬとＮＴＳＣで変化させて両システムの場合にも使用で
きるようにするためである。The reason for changing the frequency characteristics is to make the frequency characteristics of the video detection output output to the external VT'R flat at frequency 1 of the color subcarrier, and to change the frequency characteristics to P A
This is so that it can be changed between L and NTSC so that it can be used for both systems.
以下本発明の実施例について、図面とともに説明する。Embodiments of the present invention will be described below with reference to the drawings.
図において１は映像検波回路でこの映像ゝ検波回路１よ
り２ の負極性のビデオ信号が−ｐ
出力され、トランジスタ２のベースに加えられる。In the figure, reference numeral 1 denotes a video detection circuit, and the video detection circuit 1 outputs a video signal 2 of negative polarity -p, which is applied to the base of a transistor 2.
通常）・ランジスタ２の工沁ツタより検波出力が取り出
される。等しい抵抗値である抵抗３と４で分割された点
より１ｖ１１−１’の検波出力が取り出される。色副搬
送波の周波数での周波数特性を６ｄＢ持ち上げるために
ＰＡＬの場合抵抗３に並列接続されたコイル５とコンデ
ンサ６との直列共振回路で共振点を４．４３ ＭＪ■ｚ
の点にもってくる」：うにコンデンサ６とコイル６の値
を決め４．４３ ＭＴＴｚでの周波数特性を６ｄＢ持ち
−にばている。ＮＴＳＣの場合にはコンデンサ６にコン
デンサ了とダイオード８との直列回路を接続し、ダイオ
ード８のアノードにダイオード８が導通する正の電圧を
加えてコイル６とコンデンサ６と７とに」：る共振回路
で共振点が３−５８ Ｍ１■ｚの点にくるように、二Ｉ
イル５゜コンデンサ６．了の値を決め３．ｅｓ ｓ Ｗ
（ｚでの周波数特性をｓｄＢ持ち上げている。Normally) - The detection output is taken out from the transistor 2's cap. A detected output of 1v11-1' is extracted from a point divided by resistors 3 and 4 having equal resistance values. In order to raise the frequency characteristic at the color subcarrier frequency by 6 dB, in the case of PAL, a series resonant circuit consisting of a coil 5 and a capacitor 6 connected in parallel to a resistor 3 is used to raise the resonance point to 4.43 MJ z
The value of the capacitor 6 and the coil 6 is determined, and the frequency characteristic at 4.43 MTTz is set to 6 dB. In the case of NTSC, a series circuit of capacitor 6 and diode 8 is connected to capacitor 6, and a positive voltage that makes diode 8 conductive is applied to the anode of diode 8, causing resonance between coil 6 and capacitors 6 and 7. 2 I so that the resonance point in the circuit is at the point 3-58 M1■z
5° capacitor 6. Decide on the value of completion3. es s W
(The frequency characteristics at z have been raised by sdB.
このように周波数特性の補償されたビデオイバ号はコン
デンサ９を通ってテレビ信号とビデメー信月の切換回路
１３に加えられる。この切換回路１３には外部ＶＴＲ１
２より抵抗１０で終端されコンデンサ１１を通ってビデ
オ信号が入力される。逆に切換回路１３よりコンデンサ
１４を通ってＶＴＲ１２へ前述の周波数特性の補償され
たビデオ信号が加えられる。The video signal whose frequency characteristics have been compensated in this way is applied to the television signal/video signal switching circuit 13 through the capacitor 9. This switching circuit 13 has an external VTR 1
2, the video signal is input through a capacitor 11 and terminated with a resistor 10. Conversely, the video signal whose frequency characteristics have been compensated for is applied from the switching circuit 13 to the VTR 12 via the capacitor 14.
第２図と第３図は周波数特性の変化を表わした図で第２
図はＮＴＳＣの場合で実線は補償される前の検波出力の
周波数特性で破線は第１図の回路によって補償された特
性である。すなわち３．５８ＭＨｚにて６ｄＢおちてい
る周波数特性を第１図の回路で補償し持ち上げて３．
ｔｓ ａ ＭＨｚまでフラットな特性にして外部ＶＴＲ
１２へ出力している。第３図辷ｉ Ｉ） Ａ Ｌ信号受
信の場合で４．４３ ＭＨｚに対して同様のことを行な
っている。Figures 2 and 3 are diagrams showing changes in frequency characteristics.
The figure shows the case of NTSC, and the solid line is the frequency characteristic of the detection output before compensation, and the broken line is the characteristic compensated by the circuit of FIG. 1. In other words, the frequency characteristic, which has dropped by 6 dB at 3.58 MHz, is compensated for and raised by the circuit shown in Figure 1, and 3.
External VTR with flat characteristics up to ts a MHz
It is output to 12. Figure 3 辷i I) In the case of AL signal reception, the same thing is done for 4.43 MHz.
“−一
以上のように本発明は映像検波出力をトランジスタのベ
ースに接続し、このトランジスタのコレクタに直流電圧
を印加し、同ｉ・ランジスタのエミッタとアース間に二
つの抵抗の直列回路を接続［７、この二つの抵抗のうち
上記トランジスタ側の抵抗に並列にコイルとコンデンサ
との共振１鋳を接続し、この共振回路の周波数をｌ）
Ａ Ｔ、方式における色副搬送波周波数に設定し、上記
コンデンサに別のコンデンサとダイオードとの直列回路
を並列接続し、このダイオードにＰＡＬ方式がＮＴＳＣ
方式かによって変化する電圧を加えてＮＴＳＣ方式の場
合に上記ダイオードを勇通状態にして上記コイルと二つ
のコンデンサによる共振回路の共振周波数をＮＴＳＣ方
式における色副搬送周波数に設定したことを特徴とする
ものであり、ＰＡＬ方式。"-As mentioned above, the present invention connects the video detection output to the base of a transistor, applies a DC voltage to the collector of this transistor, and connects a series circuit of two resistors between the emitter of the transistor and ground. [7. Of these two resistors, connect a resonance circuit consisting of a coil and a capacitor in parallel to the transistor-side resistor, and set the frequency of this resonance circuit to l)
A series circuit of another capacitor and a diode is connected in parallel to the above capacitor, and this diode is set to the color subcarrier frequency in the PAL system.
A voltage that varies depending on the system is applied to turn the diode into a conductive state in the case of the NTSC system, and the resonant frequency of the resonant circuit made up of the coil and two capacitors is set to the color subcarrier frequency in the NTSC system. It is a PAL system.
ＮＴＳＣ方式いずれの場合にでも色副搬送波周波数付近
の特性を持ち上げることができ、しかも、極性反転用の
特別な素子を設けることなく、レベルも調整して取出す
ことができるものである。In either case of the NTSC system, the characteristics near the color subcarrier frequency can be improved, and the level can also be adjusted and extracted without providing a special element for polarity reversal.
第１図は本発明の一実施例における周波数特性補償装置
の回路図、第２図、第３図は同装置説明のだめの特性図
である。
１・・・・・・映像検波回路、２・・・・・・トランジ
スタ、３．４・・・・・・Ｍ抗、５・・・・・・コイル
、６．了・−・・・・コンデンサ、８・・−・・・ダイ
オード。FIG. 1 is a circuit diagram of a frequency characteristic compensation device according to an embodiment of the present invention, and FIGS. 2 and 3 are characteristic diagrams for explaining the same device. 1...Video detection circuit, 2...Transistor, 3.4...M resistor, 5...Coil, 6. Completed: Capacitor, 8: Diode.
Claims (1)
ランジスタのコレクタに直流１１″Ｌ圧を印加し、同ト
ランジスタのエミッタとアース間に二つの４１１−抗の
直列回路を接続し、この二つの抵抗のうち」二記トラン
ジスタ側の抵抗に並列にコイルとコンデンサとの共振回
路を接続し、この共振回路の周波数をＰＡＬ方式におけ
る色副搬送波周波数に設定し、上記コンデンサに別のコ
ンデンサとダイオードどの直列回路を並列接続１７、こ
のダイオードにＰＡＬ方式かＮ ＴＳ Ｃ方式かによっ
て変化する電圧を加えてＮＴＳＣ方式の場合に上記ダイ
オードを導通状態にして上記コイルと二つのコンデンサ
による共振回路の共振周波数をＮＴＳＣ方式における色
副搬送波周波数に設定したことを特徴とする周波数特性
補償装置。Connect the video detection output to the base of the transistor, apply a DC 11"L voltage to the collector of this transistor, connect two 411-resistance series circuits between the emitter of the transistor and ground, and A resonant circuit consisting of a coil and a capacitor is connected in parallel to the resistor on the transistor side, and the frequency of this resonant circuit is set to the color subcarrier frequency in the PAL system, and a series circuit of another capacitor and a diode is connected to the above capacitor. are connected in parallel 17, and a voltage that changes depending on whether the system is PAL or NTSC is applied to this diode, and in the case of NTSC, the diode is made conductive, and the resonant frequency of the resonant circuit made up of the coil and two capacitors is set to NTSC. A frequency characteristic compensation device characterized in that the color subcarrier frequency is set to a color subcarrier frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14364681A JPS5844876A (en) | 1981-09-10 | 1981-09-10 | Frequency characteristic compensator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14364681A JPS5844876A (en) | 1981-09-10 | 1981-09-10 | Frequency characteristic compensator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5844876A true JPS5844876A (en) | 1983-03-15 |
| JPS6365197B2 JPS6365197B2 (en) | 1988-12-14 |
Family
ID=15343617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14364681A Granted JPS5844876A (en) | 1981-09-10 | 1981-09-10 | Frequency characteristic compensator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5844876A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0457910U (en) * | 1989-12-29 | 1992-05-19 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674584U (en) * | 1979-11-12 | 1981-06-18 |
-
1981
- 1981-09-10 JP JP14364681A patent/JPS5844876A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5674584U (en) * | 1979-11-12 | 1981-06-18 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6365197B2 (en) | 1988-12-14 |
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