JPH02312360A - Horizontal oscillation circuit - Google Patents
Horizontal oscillation circuitInfo
- Publication number
- JPH02312360A JPH02312360A JP13331089A JP13331089A JPH02312360A JP H02312360 A JPH02312360 A JP H02312360A JP 13331089 A JP13331089 A JP 13331089A JP 13331089 A JP13331089 A JP 13331089A JP H02312360 A JPH02312360 A JP H02312360A
- Authority
- JP
- Japan
- Prior art keywords
- horizontal
- circuit
- signal
- synchronization signal
- absence
- 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
- 230000010355 oscillation Effects 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 11
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Landscapes
- Details Of Television Scanning (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野〕
この発明は、テレビジジン受像機等で、水平発振周波数
を安定にするために用いられる水平発振回路に関するも
のフある。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a horizontal oscillation circuit used for stabilizing the horizontal oscillation frequency in television receivers and the like.
（従来の技術〕
第２図は一般のテレビジョン受像機の水平発振回路とこ
れに対応する水平出力回路を示す図である０図において
、１はコンデンサ、２は抵抗、２０はコンデンサ１と抵
抗２からなる微分回路、３は水平発振器、４はボリュー
ム、５は水平出力回路である。(Prior Art) Fig. 2 is a diagram showing a horizontal oscillation circuit of a general television receiver and a corresponding horizontal output circuit. In Fig. 0, 1 is a capacitor, 2 is a resistor, and 20 is a capacitor 1 and a resistor. 2 is a differential circuit, 3 is a horizontal oscillator, 4 is a volume, and 5 is a horizontal output circuit.
次に動作について説明する。微分回路２０は端子ａから
人力される同期信号から水平同期信号を分離し、水平発
振器はこの水平同期信号に同期して発振する。Next, the operation will be explained. The differentiating circuit 20 separates the horizontal synchronizing signal from the synchronizing signal input manually from the terminal a, and the horizontal oscillator oscillates in synchronization with this horizontal synchronizing signal.
この水平発振器はボリューム４により所定の水平発振周
波数となるように調整されており、この水平発振回路の
出力信号は水平偏向回路を構成する水平出力回路に入力
されている。This horizontal oscillator is adjusted by a volume 4 to have a predetermined horizontal oscillation frequency, and the output signal of this horizontal oscillation circuit is input to a horizontal output circuit constituting a horizontal deflection circuit.
ここで通常の同期信号が入力されている場合、水平発振
器の出力周波数は入力同期信号の周波数に同期する。If a normal synchronization signal is input here, the output frequency of the horizontal oscillator is synchronized with the frequency of the input synchronization signal.
これに対し、同期信号が入力されない状態において、雑
音や水平出力回路からの回り込み誘導等により異常な疑
似同期信号が入力されると、水平発振周波数が安定せず
、水平出力回路のフライバックトランスや偏向ヨーク等
から異常音を発生したり、またこれらの回路部品に異常
なストレスが加わるという問題があった。On the other hand, if an abnormal pseudo synchronization signal is input due to noise or wrap-around induction from the horizontal output circuit when no synchronization signal is input, the horizontal oscillation frequency will not be stabilized, and the flyback transformer of the horizontal output circuit will There have been problems in that abnormal sounds are generated from the deflection yoke and the like, and abnormal stress is applied to these circuit components.
この発明は、上記のような従来のものの問題点を解決す
るためになされたもので、同期信号が正常に入力された
時は通常動作で働き、無信号時には水平発振周波数を安
定な動作領域に設定できる水平発振回路を得ることを目
的としている。This invention was made in order to solve the problems of the conventional ones as described above. When the synchronization signal is normally input, it operates in normal operation, and when there is no signal, the horizontal oscillation frequency is kept in a stable operating region. The purpose is to obtain a horizontal oscillation circuit that can be set.
この発明に係る水平発振回路は、入力複合同期信号に含
まれている垂直同期信号の有無を検出して水平発振器を
制御するように構成したものである。The horizontal oscillator circuit according to the present invention is configured to control a horizontal oscillator by detecting the presence or absence of a vertical synchronization signal included in an input composite synchronization signal.
この発明においては、垂直同期信号の無信号を検出し水
平発振器の発振周波数を安全動作領域に設定するように
したので、異常発振を抑えることができるとともに、回
路に加わるストレスを軽減することができる。In this invention, since the oscillation frequency of the horizontal oscillator is set to a safe operating area by detecting the absence of a vertical synchronization signal, it is possible to suppress abnormal oscillation and reduce the stress applied to the circuit. .
以下、この発明の実施例を図について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図はこの発明の一実施例による水平発振回路の構成
を示すブロック図であり、図において、３０は抵抗１１
とコンデンサＩ２からなる積分器で、端子ａより入力さ
れる同期信号を積分し、垂直同期信号を分離する働きを
している。工３はリトリガブル単安定マルチバイブレー
クであり、上記垂直同期信号を入力として蔓より同期信
号の有無を示す検出信号を出力する。４０は積分器３０
とリトリガブル単安定マルチバイブレータ１３からなる
同期信号検出回路であり、垂直同期信号の有無を判定す
ることにより入力複合同期信号の有無を検出する＃ １
４は同期信号検出回路４０の検出信号によって動作する
電子スイッチで、水平発振周波数を調整する抵抗１５を
ＯＮ１０ Ｆ Ｆする役目を果たしている。FIG. 1 is a block diagram showing the configuration of a horizontal oscillation circuit according to an embodiment of the present invention, and in the figure, 30 is a resistor 11.
An integrator consisting of a capacitor I2 and a capacitor I2 functions to integrate the synchronization signal input from terminal a and separate the vertical synchronization signal. Reference numeral 3 is a retriggerable monostable multi-bi break, which inputs the vertical synchronization signal and outputs a detection signal indicating the presence or absence of the synchronization signal. 40 is an integrator 30
#1 is a synchronization signal detection circuit consisting of a retriggerable monostable multivibrator 13, and detects the presence or absence of an input composite synchronization signal by determining the presence or absence of a vertical synchronization signal.
4 is an electronic switch operated by the detection signal of the synchronization signal detection circuit 40, and serves to turn on the resistor 15 for adjusting the horizontal oscillation frequency.
次に上記構成の動作について説明する。図中２０．３．
５で構成される水平同期回路は従来と同じ回路ブロック
である。Next, the operation of the above configuration will be explained. 20.3 in the figure.
5 is the same circuit block as the conventional one.
入力同期信号ａは分岐され積分器３０で垂直同期信号が
分離される。ここでリトリガブル単安定マルチバイブレ
ータ１３のワンショット時間Ｔを、Ｔ〉垂直同期信号期
間
とすれば、通常垂直同期信号が連続して入力されるため
回出力はリトリガブル動作で“″ＬＨレベルになってい
る。The input synchronizing signal a is branched and an integrator 30 separates the vertical synchronizing signal. Here, if the one-shot time T of the retriggerable monostable multivibrator 13 is T>vertical synchronization signal period, the vertical synchronization signal is normally input continuously, so the output becomes "LH level" due to retriggerable operation. There is.
この検出信号で電子スイッチ１４を０Ｎ１０ＦＦするが
、通常はＯＦＦ状態のため水平発振回路はボリューム４
で調整された周波数で発振する。This detection signal turns the electronic switch 14 0N10FF, but since it is normally in the OFF state, the horizontal oscillation circuit is turned on by the volume 4.
oscillates at a frequency adjusted by .
次に入力ａが無信号となり疑似同期信号や水平妨害によ
る雑音が入力されても積分器によって雑音成分が取り除
かれるので出力は出なくなり、リトリガブル単安定マル
チバイブレータのリトリガブル動作が解除され、回出力
は°“Ｈ”の検出信号が得られる。Next, even if there is no signal at input a and noise due to a pseudo synchronization signal or horizontal interference is input, the noise component is removed by the integrator, so no output is output, the retriggerable operation of the retriggerable monostable multivibrator is released, and the output is °A detection signal of “H” is obtained.
この検出信号によって電子スイッチはＯＮ状態となり、
抵抗１５が導通し安定な水平発振周波数に切換える。This detection signal turns the electronic switch on,
The resistor 15 becomes conductive and switches to a stable horizontal oscillation frequency.
このように、本実施例によれば、人力同期信号を積分し
て得られる垂直同期信号の有無を検出して、無信号状態
を検出するようにしたので、検出精度は雑音に対しても
強く、無信号時における雑音妨害信号による異常音の発
生や回路部品に異常なストレスが加わることを防ぐこと
ができる。In this way, according to this embodiment, the presence or absence of the vertical synchronization signal obtained by integrating the manual synchronization signal is detected to detect the no-signal state, so the detection accuracy is strong against noise. It is possible to prevent the generation of abnormal sounds due to noise interference signals when there is no signal and to prevent abnormal stress from being applied to circuit components.
以上の様に、この発明に係る水平発振回路によれば、入
力同期信号を積分して得られる垂直同期信号の有無を検
出して、無信号状態を検出するようにしたので、検出精
度は雑音に対しても強く、無信号時における雑音妨害信
号による異常音の発生や回路部品に異常なストレスが加
わることを防ぐことができる。As described above, according to the horizontal oscillation circuit according to the present invention, since the presence or absence of the vertical synchronization signal obtained by integrating the input synchronization signal is detected to detect the no-signal state, the detection accuracy is reduced by noise. It also prevents abnormal sounds from being generated and abnormal stress being applied to circuit components due to noise interference signals when there is no signal.
【図面の簡単な説明】
第１図はこの発明の一実施例による水平発振回路を示す
ブロック図、第２図は従来の水平発振回路を示すブロッ
ク図である。
図において、３は水平発振器、４はボリューム、５は水
平出力回路、１３はリトリガブル単安定マルチバイブレ
ーク、１４は電子スイッチ、２０は微分器、３０は積分
器、４０は同期信号検出回路である。
なお図中同一符号は同−又は相当部分を示す。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a horizontal oscillation circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional horizontal oscillation circuit. In the figure, 3 is a horizontal oscillator, 4 is a volume, 5 is a horizontal output circuit, 13 is a retriggerable monostable multi-bi break, 14 is an electronic switch, 20 is a differentiator, 30 is an integrator, and 40 is a synchronization signal detection circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
振する水平発振器と、 上記入力複合同期信号に含まれる垂直同期信号の有無に
より入力複合同期信号の有無を検出する同期信号検出回
路と、 該検出回路の出力信号で動作し上記水平発振器の水平発
振周波数を制御する電子スイッチとを備えたことを特徴
とする水平発振回路。(1) In the horizontal oscillation circuit, the presence or absence of the input composite sync signal is detected based on the horizontal oscillator that oscillates in synchronization with the horizontal sync signal included in the input composite sync signal, and the presence or absence of the vertical sync signal included in the input composite sync signal. A horizontal oscillation circuit comprising: a synchronization signal detection circuit; and an electronic switch that operates based on an output signal of the detection circuit and controls the horizontal oscillation frequency of the horizontal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13331089A JPH02312360A (en) | 1989-05-26 | 1989-05-26 | Horizontal oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13331089A JPH02312360A (en) | 1989-05-26 | 1989-05-26 | Horizontal oscillation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02312360A true JPH02312360A (en) | 1990-12-27 |
Family
ID=15101687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13331089A Pending JPH02312360A (en) | 1989-05-26 | 1989-05-26 | Horizontal oscillation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02312360A (en) |
-
1989
- 1989-05-26 JP JP13331089A patent/JPH02312360A/en active Pending
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