JPS62166665A - Signal processing circuit - Google Patents
Signal processing circuitInfo
- Publication number
- JPS62166665A JPS62166665A JP916186A JP916186A JPS62166665A JP S62166665 A JPS62166665 A JP S62166665A JP 916186 A JP916186 A JP 916186A JP 916186 A JP916186 A JP 916186A JP S62166665 A JPS62166665 A JP S62166665A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- electric field
- output
- luminance
- field strength
- 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
- 230000005684 electric field Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 8
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 238000005282 brightening Methods 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 101000956004 Homo sapiens Vitamin D-binding protein Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 102000051433 human GC Human genes 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、テレビジョン受像機の信号処理回路に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a signal processing circuit for a television receiver.
従来の技術
テレビジョン受像機は、最近、パーソナルコンピュータ
等の端末用のモニターとして使われ、その直流再生率は
、１００％位の高い状態で使われている。ここで、この
ようなテレビジョン受像機の基本構成を第３図に示す。BACKGROUND OF THE INVENTION Television receivers have recently been used as monitors for terminals such as personal computers, and their direct current reproduction rate is as high as 100%. Here, the basic configuration of such a television receiver is shown in FIG.
第３図において、１はチューナ、２はビデオ中間周波増
幅・検波回路、３はムＧＣ回路、４はビデオ信号処理回
路、６は輝度コントロール回路、８はビデオ出力増幅回
路、７はブラウン管、８．１０は輝度コントロール用の
抵抗、９は可変抵抗器である。In Fig. 3, 1 is a tuner, 2 is a video intermediate frequency amplification/detection circuit, 3 is a GC circuit, 4 is a video signal processing circuit, 6 is a brightness control circuit, 8 is a video output amplification circuit, 7 is a cathode ray tube, 8 .10 is a resistance for brightness control, and 9 is a variable resistor.
発明が解決しようとする問題点
ところが上記した構成では、直流再生率が１００％の場
合、電界強度が低い時、あるいは、無信号時、画面が真
暗になり、テレビの視聴者に奇異な感じを与えるという
問題点があった。Problems to be Solved by the Invention However, with the above configuration, when the DC reproduction rate is 100%, the screen becomes pitch black when the electric field strength is low or there is no signal, giving a strange feeling to the TV viewer. There was a problem with giving.
本発明は上記問題点に鑑み、直流再生率がほぼ１００％
のテレビジョン受像機において弱電界時、その画面を明
るくし奇異な感じを与えることがない信号処理回路を提
供するものである。In view of the above problems, the present invention has a DC regeneration rate of almost 100%.
To provide a signal processing circuit that brightens the screen of a television receiver and does not give a strange feeling when the electric field is weak.
問題点を解決するだめの手段
本発明は、電界強度全検出し、弱電界時、或いは、無信
号時、電界強度検出回路の検出回路の検出出力を輝度コ
ントロール回路に接続し、輝度を上げて、画面が真暗に
なる事を防ぐようにしたものである。Means to Solve the Problem The present invention detects the entire electric field strength, and when the electric field is weak or there is no signal, the detection output of the electric field strength detection circuit is connected to the brightness control circuit to increase the brightness. , to prevent the screen from going completely black.
作用
本発明により、弱電界時でも画面が暗くなる状態を防ぐ
事が可能となる。Effect: According to the present invention, it is possible to prevent the screen from becoming dark even in the case of a weak electric field.
実施例
以下本発明の一実施例を図面を参照して説明する０
第１図は本発明の一実施例の信号処理回路を示すもので
ある。第１図において第３図と同一部には同一番号を付
している。Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a signal processing circuit according to an embodiment of the present invention. In FIG. 1, the same parts as in FIG. 3 are given the same numbers.
テレビ信号は、チューナ−１全通してビデオ中間周波増
幅・検波回路２へ供給される。同時に、１００回路３で
その出力レベルが制御される。その出力はビデオ信号処
理回路４を通って輝度コントロール回路５に入力され、
更にビデオ出力増幅回路６ｆ通してブラウン管７を駆動
する。輝度コントロール回路６は、抵抗８．１０、可変
抵抗器９で可変された電圧で制御され輝度コントロール
電圧ｖ１ が高くなると輝度が上がるようになっている
。１１は、人ＧＯ回路３から出力されるＩＦ人ＧＣ電圧
のバッファであり、１２はバッファ１１の出力端と、抵
抗８とポリウム９の中点との間に接続されているダイオ
ードである。The television signal is supplied to a video intermediate frequency amplification/detection circuit 2 through the entire tuner 1. At the same time, the output level of the 100 circuit 3 is controlled. The output passes through the video signal processing circuit 4 and is input to the brightness control circuit 5.
Furthermore, a cathode ray tube 7 is driven through a video output amplifier circuit 6f. The brightness control circuit 6 is controlled by a voltage varied by a resistor 8.10 and a variable resistor 9, and the brightness increases as the brightness control voltage v1 increases. 11 is a buffer for the IF human GC voltage output from the human GO circuit 3, and 12 is a diode connected between the output terminal of the buffer 11 and the midpoint between the resistor 8 and the polygon 9.
今、入力信号が弱電界になってくるとＩＦ ＪＧＣ電圧
が、６０ｄＢ位から第２図に示す如く下がり始める。バ
ッファ１１に第２図に示すｖ２のスレッシュホールドレ
ベルを与えておき、ＩＦ人ＧＯ電圧がｖ２の電位以下に
なると、バッファ１１の出力が大きくなっていく様に構
成する。直流再生率がほぼ１００％のテレビ受像機では
弱電界になると、画面は暗くなるが、この時本実施例の
構成ではバッフ１１１の出力電位が上昇していき、抵抗
８と可変抵抗器９の中点電位よりもダイオード１２の順
方向電圧が０．ＴＶ高くなった時、ダイオード１２が導
通し、抵抗８と可変抵抗器９の中点電圧が上昇する。こ
れによりプライトコントロール電位ｖ１ は、上昇し、
画面の輝度が上がり、画面が暗くなる事を防ぐ事ができ
る。なお、テレビジぢン受像機にマイクロコンピュータ
（以下マイコンと略称する）を有し、輝度制御がマイコ
ン出力によって制御されているテレビジョン受像機で、
マイコンの入力に電界強度検出出力が接続され、電界が
下がった時、マイコンにより、輝度を上げるようにして
もよい。Now, when the input signal becomes a weak electric field, the IF JGC voltage starts to drop from about 60 dB as shown in Figure 2. A threshold level v2 shown in FIG. 2 is given to the buffer 11, and the configuration is such that when the IF GO voltage becomes less than the potential v2, the output of the buffer 11 increases. In a television receiver with a DC reproduction rate of almost 100%, the screen becomes dark when the electric field becomes weak, but at this time, in the configuration of this embodiment, the output potential of the buffer 111 increases, and the resistance of the resistor 8 and variable resistor 9 increases. When the forward voltage of the diode 12 is 0. When the TV becomes high, the diode 12 becomes conductive and the midpoint voltage between the resistor 8 and the variable resistor 9 increases. As a result, the prite control potential v1 rises,
This increases the screen brightness and prevents the screen from becoming dark. Furthermore, the television receiver has a microcomputer (hereinafter referred to as microcomputer), and the brightness control is controlled by the microcomputer output.
An electric field strength detection output may be connected to the input of the microcomputer, and the microcomputer may increase the brightness when the electric field decreases.
発明の効果
以上の様に本発明によれば、弱電界時或いは無信号時、
直流再生率が高い為、画面が暗くなった時、電界強度を
検出し、その検出出力により輝度を上げる事により、画
面が暗くなる状態を防ぐ事ができる。As described above, according to the present invention, when there is a weak electric field or no signal,
Since the DC regeneration rate is high, when the screen becomes dark, the electric field strength is detected and the brightness is increased based on the detection output, thereby preventing the screen from becoming dark.
第１図は本発明の一実施例における信号処理回路のブロ
ック図、第２図はＩＦＡＧ（ｊ特性とバッファのスレッ
シュホールド電圧を示す特性図、第３図は従来のテレビ
ジョン受像機のブロック図である。
３・・・・・ＡＧＯ回路、５・・・・・・輝度コントロ
ール回路、９・・・・・・可変抵抗器、１１・・・・・
・バッファ。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第 ２ 図Fig. 1 is a block diagram of a signal processing circuit in an embodiment of the present invention, Fig. 2 is a characteristic diagram showing IFAG (j characteristics and buffer threshold voltage), and Fig. 3 is a block diagram of a conventional television receiver. 3... AGO circuit, 5... Brightness control circuit, 9... Variable resistor, 11...
·buffer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
強度検出回路の出力を輝度コントロール端子に供給し、
弱電界時、直流再生率が高い為画面が暗くなった時、画
面を明るくするようにしたことを特徴とする信号処理回
路。comprising an electric field strength detection circuit for detecting electric field strength, supplying the output of the electric field strength detection circuit to a brightness control terminal;
A signal processing circuit characterized by brightening the screen when the screen becomes dark due to its high direct current regeneration rate in a weak electric field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP916186A JPS62166665A (en) | 1986-01-20 | 1986-01-20 | Signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP916186A JPS62166665A (en) | 1986-01-20 | 1986-01-20 | Signal processing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62166665A true JPS62166665A (en) | 1987-07-23 |
Family
ID=11712889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP916186A Pending JPS62166665A (en) | 1986-01-20 | 1986-01-20 | Signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62166665A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1467559A1 (en) * | 2003-04-11 | 2004-10-13 | Thomson Licensing S.A. | Video receiver |
-
1986
- 1986-01-20 JP JP916186A patent/JPS62166665A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1467559A1 (en) * | 2003-04-11 | 2004-10-13 | Thomson Licensing S.A. | Video receiver |
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