JPS5952866B2 - Synchronous level automatic equalization method - Google Patents
Synchronous level automatic equalization methodInfo
- Publication number
- JPS5952866B2 JPS5952866B2 JP51107386A JP10738676A JPS5952866B2 JP S5952866 B2 JPS5952866 B2 JP S5952866B2 JP 51107386 A JP51107386 A JP 51107386A JP 10738676 A JP10738676 A JP 10738676A JP S5952866 B2 JPS5952866 B2 JP S5952866B2
- Authority
- JP
- Japan
- Prior art keywords
- level
- signal
- carrier wave
- equalization method
- automatic equalization
- 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
- 238000000034 method Methods 0.000 title claims description 4
- 230000001360 synchronised effect Effects 0.000 title description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
Landscapes
- Details Of Television Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【発明の詳細な説明】
本発明はテレビジョン信号の伝送機器において、同期信
号レベルを機器の非直線性にかかわらず一定に保つため
の同期レベル自動等化方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic synchronization level equalization method for television signal transmission equipment to keep the synchronization signal level constant regardless of nonlinearity of the equipment.
テレビジョン信号の伝送機器においてはその非直線性に
よつて同期信号のレベルが圧縮されて、一定のレベルに
保たれないのが普通である。In television signal transmission equipment, the level of the synchronization signal is usually compressed due to its non-linearity and cannot be maintained at a constant level.
すなわち第１図は一般的な伝送機器の一般的な入出力特
性であり、入力レベルの大きい領域で直線性が失なわれ
ている。このため第２図のように同期信号レベルが圧縮
される。That is, FIG. 1 shows the general input/output characteristics of a general transmission device, and linearity is lost in a region where the input level is large. Therefore, the synchronization signal level is compressed as shown in FIG.
したがつてこの影響を少くするためには伝送機器として
直線性に余裕のある電力増巾器を用いる必要があり、ま
た多段中継の際は同期信号レベルの圧縮が累加されるた
め、これを防ぐためには各中継局に直線性の良い増巾器
を設ける必要があつた。Therefore, in order to reduce this effect, it is necessary to use a power amplifier with sufficient linearity as a transmission device, and since the synchronization signal level is cumulatively compressed during multi-stage relaying, it is necessary to prevent this. In order to achieve this, it was necessary to install an amplifier with good linearity at each relay station.
本発明は同期信号のみを伸長して自動的にレベル制御を
行なうことにより規定の同期信号のレベル比を保とうと
するものであり以下その一実施例について説明する。The present invention attempts to maintain a specified level ratio of synchronizing signals by expanding only the synchronizing signals and automatically controlling the level.One embodiment of the present invention will be described below.
第３図において、Ａは映像信号人力端子、Ｂは非直線補
償器、Ｃは映像信号出力端子、Ｄは同期信号部分の搬送
波の尖頭値を検出する同期信号尖頭搬送波レベル検出器
、Ｅは同期信号選別器、Ｆはペデスタル抜取信号回路、
Ｇはペデスタル部分の搬送波を抜き出すゲート回路、Ｈ
は尖頭値検波回路、Ｉは比較増巾器、Ｐは電力増巾器で
ある。In FIG. 3, A is a video signal input terminal, B is a nonlinear compensator, C is a video signal output terminal, D is a synchronization signal peak carrier wave level detector that detects the peak value of the carrier wave of the synchronization signal portion, and E is a synchronous signal selector, F is a pedestal extraction signal circuit,
G is a gate circuit that extracts the carrier wave from the pedestal part, H
is a peak value detection circuit, I is a comparison amplifier, and P is a power amplifier.
以下この装置の動作を説明すると、信号入力の一部はレ
ベル検出器Ｄに加えられ、映像信号の同期信号部分の搬
送波の尖頭値が検出される。一方同期信号選別器Ｅで同
期信号が選別されてペデスタル抜取信号回路Ｆに加えら
れる。ペデスタル抜取信号回路Ｆは水平同期信号を遅延
し、ペデスタル期間に相当する位相で搬送波を抜き出す
ための信号を作りゲートＧに加える。したがつてゲート
Ｇは映像信号のペデスタル部分に相当する位相で開とな
りペデスタル部分の搬送波がとり出され、尖頭値検波回
路Ｈにより検波され、比較増巾器Ｉにおいて、ペデスタ
ル部分の搬送波レベルと同期信号部分の搬送波レベルが
比較され、その比が所定に値になるよう非直線補償器Ｂ
を制御する。The operation of this device will be described below. A portion of the signal input is applied to a level detector D, and the peak value of the carrier wave of the synchronizing signal portion of the video signal is detected. On the other hand, the synchronous signal is selected by the synchronous signal selector E and applied to the pedestal extraction signal circuit F. The pedestal sampling signal circuit F delays the horizontal synchronizing signal, generates a signal for extracting the carrier wave at a phase corresponding to the pedestal period, and applies it to the gate G. Therefore, the gate G is opened at a phase corresponding to the pedestal portion of the video signal, and the carrier wave of the pedestal portion is taken out, detected by the peak detection circuit H, and in the comparator amplifier I, the carrier wave level of the pedestal portion and the carrier wave level of the pedestal portion are taken out. The carrier wave levels of the synchronization signal part are compared, and the nonlinear compensator B is set so that the ratio becomes a predetermined value.
control.
この場合同期レベルの制御は同期信号を伝送する時間帯
だけ伝送機器の利得を増加（又は減少）させることによ
つても実現できる。In this case, control of the synchronization level can also be realized by increasing (or decreasing) the gain of the transmission equipment only during the time period during which the synchronization signal is transmitted.
このように本発明によれば電力増巾器の直線性をけんみ
つに要求しなくても、同期信号のレベルを圧縮させずに
所定のレベルで伝送することが可能になる。As described above, according to the present invention, it is possible to transmit the synchronization signal at a predetermined level without compressing the level of the synchronization signal without requiring strict linearity of the power amplifier.
第１図は一般の増巾器の入出力特性を示す図、第２図は
従来方式により映像信号の伝送されるもようを示す図、
第３図は本発明の同期レベル自動等化方式を示すプロツ
ク図である。
Ｂ・・・・・・非直線補償器、Ｄ・・・・・・同期信号
尖頭搬送波レベル検出器、Ｅ・・・・・・同期信号選別
器、Ｆ・・・・・・ペデスタル抜取信号回路、Ｇ・・・
・・・ゲート回路、１・・・・・・比較増巾器。Fig. 1 is a diagram showing the input/output characteristics of a general amplifier, Fig. 2 is a diagram showing how a video signal is transmitted by the conventional method,
FIG. 3 is a block diagram showing the synchronization level automatic equalization method of the present invention. B...Nonlinear compensator, D...Synchronization signal peak carrier wave level detector, E...Synchronization signal selector, F...Pedestal sampling signal Circuit, G...
...Gate circuit, 1... Comparison amplifier.
Claims (1)
ルを検出比較し、その比が所定の値になるよう伝送機器
の利得補償を行なうことを特徴とする同期レベル自動等
化方式。1. A synchronization level automatic equalization method that detects and compares the peak carrier wave level of the synchronization signal and the pedestal carrier wave level, and compensates the gain of the transmission equipment so that the ratio thereof becomes a predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51107386A JPS5952866B2 (en) | 1976-09-07 | 1976-09-07 | Synchronous level automatic equalization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51107386A JPS5952866B2 (en) | 1976-09-07 | 1976-09-07 | Synchronous level automatic equalization method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5332613A JPS5332613A (en) | 1978-03-28 |
| JPS5952866B2 true JPS5952866B2 (en) | 1984-12-21 |
Family
ID=14457802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51107386A Expired JPS5952866B2 (en) | 1976-09-07 | 1976-09-07 | Synchronous level automatic equalization method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952866B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0437943Y2 (en) * | 1987-03-23 | 1992-09-07 |
-
1976
- 1976-09-07 JP JP51107386A patent/JPS5952866B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5332613A (en) | 1978-03-28 |
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