JPH02301372A - Horizontal deflection circuit - Google Patents
Horizontal deflection circuitInfo
- Publication number
- JPH02301372A JPH02301372A JP1122447A JP12244789A JPH02301372A JP H02301372 A JPH02301372 A JP H02301372A JP 1122447 A JP1122447 A JP 1122447A JP 12244789 A JP12244789 A JP 12244789A JP H02301372 A JPH02301372 A JP H02301372A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- horizontal
- deflection
- frequency
- screen size
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000004044 response Effects 0.000 abstract description 4
- 230000011664 signaling Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
- H04N3/27—Circuits special to multi-standard receivers
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野]
本発明は、複数の水平周波数に対応したマルチスキャン
方式のテレビジョン受像機の水平偏向回路に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a horizontal deflection circuit for a multi-scan type television receiver that supports a plurality of horizontal frequencies.
本発明は、複数の水平周波数に対応したマルチスキャン
方式のテレビジョン受像機の水平偏向回路において、入
力映像信号の偏向幅と入力映像信号の水平方向の画面サ
イズとを比較し、この比較信号と画面サイズ信号とを加
算し、入力映像信号の水平周波数に比例した電圧信号と
加算信号とを乗算し、この乗算信号により水平出力回路
を制御するようにし、水平周波数の変化に追随した良好
な水平偏向が行われるようにしたものである。The present invention compares the deflection width of an input video signal with the horizontal screen size of the input video signal in a horizontal deflection circuit of a multi-scan television receiver that supports a plurality of horizontal frequencies. The voltage signal proportional to the horizontal frequency of the input video signal is multiplied by the added signal, and the horizontal output circuit is controlled by this multiplied signal. It is designed so that deflection is performed.
近年、複数の水平周波数の映像信号に対応したマルチス
キャン方式のテレビジョン受像機が開発されている(特
開昭6l−7=1463号公報参照)。このマルチスキ
ャン方式のテレビジョン受像機は、水平周波数が変化し
てもビームの水平方向の偏向幅を一定にするために、第
3図に示す如き水平偏向回路を必要とする。即ち、第3
図において(1)は水平同期信号入力端子に示し、この
入力端子(1)に得られる水平同期信号を、周波数・電
圧変換器(2)に供給し、水平同期信号の周波数に比例
して変化する電圧信号に変換する。そして、この周波数
・電圧変換器(2)が出力する電圧信号を、乗算器(3
)の一方の入力端子に供給する。また、図中(4)は偏
向幅に比例した電圧の偏向制御n信号入力端子を示し、
この入力端子(4)に得られる偏向制御信号を、乗算器
(3)の他方の入力端子に供給する。そして、この乗算
器(3)で、水平同期信号の周波数に応じた電圧信号を
、偏向制御信号で示される偏向幅に応じて乗算により変
化させ、乗算信号をスイッチングレギュレータ(5)に
制御信号として供給する。そして、このスイッチングレ
ギュレータ(5)が乗算信号に応じて出力する直流出力
信号を、水平出力回路(6)に電源信号として供給し、
入力端子(1)に得られる水平同期信号をこの水平出力
回路(6)に供給し、水平同期信号に基づいた周期の水
平偏向用出力信号を、水平偏向コイル(図示せず)側と
接続された出力端子(6a)に得る。In recent years, multi-scan type television receivers that are compatible with video signals of a plurality of horizontal frequencies have been developed (see Japanese Patent Laid-Open No. 1463/1986). This multi-scan type television receiver requires a horizontal deflection circuit as shown in FIG. 3 in order to keep the horizontal deflection width of the beam constant even if the horizontal frequency changes. That is, the third
In the figure, (1) indicates the horizontal synchronization signal input terminal, and the horizontal synchronization signal obtained at this input terminal (1) is supplied to the frequency/voltage converter (2), and changes in proportion to the frequency of the horizontal synchronization signal. Convert to a voltage signal. Then, the voltage signal output from this frequency/voltage converter (2) is converted into a multiplier (3).
) to one input terminal of the In addition, (4) in the figure shows a deflection control n signal input terminal with a voltage proportional to the deflection width.
The deflection control signal obtained at this input terminal (4) is supplied to the other input terminal of the multiplier (3). Then, the multiplier (3) multiplies and changes the voltage signal according to the frequency of the horizontal synchronizing signal according to the deflection width indicated by the deflection control signal, and the multiplied signal is sent to the switching regulator (5) as a control signal. supply Then, the switching regulator (5) supplies the DC output signal output according to the multiplication signal to the horizontal output circuit (6) as a power signal,
A horizontal synchronizing signal obtained at the input terminal (1) is supplied to this horizontal output circuit (6), and an output signal for horizontal deflection having a period based on the horizontal synchronizing signal is connected to the horizontal deflection coil (not shown) side. output terminal (6a).
斯かる構成によると、人力映像信号の水平周波数が変化
すると、端子(1)に得られる水平同期信号の周波数が
変化するため、スイッチングレギュレータ(5)が水平
出力回路(6)に供給する電源電圧が変化し、水平周波
数が変化しても水平偏向幅が略一定に制御される。According to this configuration, when the horizontal frequency of the human-powered video signal changes, the frequency of the horizontal synchronizing signal obtained at the terminal (1) changes, so that the power supply voltage supplied by the switching regulator (5) to the horizontal output circuit (6) changes. Even if the horizontal frequency changes, the horizontal deflection width is controlled to be substantially constant.
また、第4図に示す如き水平偏向°回路とすることもで
きる。即ち、水平同期信号入力端子(1)に得られる水
平同期信号を、水平出力回路(6)に供給し、この水平
出力回路(6)の出力信号を偏向幅検出回路(7)に供
給する。この偏向幅検出回路(7)が水平出力回路(6
)の出力信号より水平偏向幅を検出し、検出信号を積分
回路(8)により積分した後、比較器(9)の一方の比
較信号入力端子に供給する。そして、偏向制御n信号入
力端子(4)に得られる偏向幅に比例した偏向制御信号
を、比較器(9)の他方の比較信号入力端子に供給し、
この比較器(9)で制御信号により示される偏向幅と検
出信号により示される実際の偏向幅とを比較する。そし
て、比較の結果出力される差信号を、スイッチングレギ
ュレータ(5)に制御信号として供給し、このスイッチ
ングレギュレータ(5)が出力する直流信号を水平出力
回路(6)に電源信号として供給する。Alternatively, a horizontal deflection circuit as shown in FIG. 4 may be used. That is, the horizontal synchronizing signal obtained at the horizontal synchronizing signal input terminal (1) is supplied to the horizontal output circuit (6), and the output signal of this horizontal output circuit (6) is supplied to the deflection width detection circuit (7). This deflection width detection circuit (7) is connected to the horizontal output circuit (6).
), the detection signal is integrated by an integrating circuit (8), and then supplied to one comparison signal input terminal of a comparator (9). Then, a deflection control signal proportional to the deflection width obtained at the deflection control n signal input terminal (4) is supplied to the other comparison signal input terminal of the comparator (9),
This comparator (9) compares the deflection width indicated by the control signal with the actual deflection width indicated by the detection signal. Then, the difference signal output as a result of the comparison is supplied to the switching regulator (5) as a control signal, and the DC signal output from this switching regulator (5) is supplied to the horizontal output circuit (6) as a power signal.
斯かる第4図例の構成によっても、入力映像信号の水平
周波数が変化しても水平偏向幅が略一定に保たれる。即
ち、比較器(9)により制御しようとする偏向幅と実際
の偏向幅とが比較され、差を少なくするようにスイッチ
ングレギュレータ(5)を制御するので、水平偏向幅が
水平周波数の変化によって変動するのが防止される。With the configuration of the example shown in FIG. 4 as well, the horizontal deflection width can be kept substantially constant even if the horizontal frequency of the input video signal changes. That is, the comparator (9) compares the deflection width to be controlled with the actual deflection width, and controls the switching regulator (5) to reduce the difference, so that the horizontal deflection width does not change due to changes in the horizontal frequency. This will prevent you from doing so.
ところが、第3図例の構成では入力映像信号の水平周波
数rMが高くなるに従って、水平偏向幅がわずかに変動
する不都合がある。即ち、第5図に破線で示す如く、水
平周波数fHとスイッチングレギュレータ(5)の出力
電圧Vとが正比例することで、水平偏向幅が一定に制御
されるが、実際には同図中に実線で示す如く、水平周波
数fHが高くなるに従って出力電圧Vが高くなって、水
平偏向幅が10〜20%程度変動してしまう。このよう
に水平偏向幅が変動するのは、水平周波数が変化しても
ビームの帰線期間が変化しないためである。However, in the configuration of the example shown in FIG. 3, there is a disadvantage that the horizontal deflection width varies slightly as the horizontal frequency rM of the input video signal increases. That is, as shown by the broken line in Figure 5, the horizontal frequency fH is directly proportional to the output voltage V of the switching regulator (5), so that the horizontal deflection width is controlled to be constant, but in reality, the solid line in the figure As shown, as the horizontal frequency fH increases, the output voltage V increases, and the horizontal deflection width fluctuates by about 10 to 20%. The reason why the horizontal deflection width fluctuates in this way is that the retrace period of the beam does not change even if the horizontal frequency changes.
即ち、成る水平周波数により定まる1水平走査期間H1
に水平偏向コイルに供給される信号は、第6図Aに示す
如く、映像走査期間T、に電圧値が直線的に増大し、帰
線期間T、lに電圧値が減少する。ここで、第6図Bに
示す如く、水平周波数が2倍に変化して1水−平走査期
間H,が上述の17に平走査期間H3の半分に変化した
とする。このとき、帰線期間TRは水平周波数にかかわ
らず一定であるので、この水平走査期間H2の映像走査
期間Ttは、水平走査期間H1の映像走査期間T1の半
分よりも短かくなる。従って、水平周波数の変化と映像
走査期間の変化とは正比例ではなく、第3図例の如き回
路では水平周波数の上昇に従って偏向幅に誤差が生じ、
偏向幅が変化してしまう。That is, one horizontal scanning period H1 determined by the horizontal frequency
As shown in FIG. 6A, the voltage value of the signal supplied to the horizontal deflection coil increases linearly during the image scanning period T, and decreases during the retrace period T,l. Here, as shown in FIG. 6B, it is assumed that the horizontal frequency is doubled and one horizontal scanning period H is changed to 17, which is half of the horizontal scanning period H3. At this time, since the blanking period TR is constant regardless of the horizontal frequency, the video scanning period Tt of the horizontal scanning period H2 is shorter than half of the video scanning period T1 of the horizontal scanning period H1. Therefore, changes in the horizontal frequency and changes in the video scanning period are not directly proportional, and in a circuit like the example shown in Figure 3, an error occurs in the deflection width as the horizontal frequency increases.
The deflection width changes.
また、偏向幅を検出して帰還をかける第4図例の如き回
路構成では、水平周波数により偏向幅に誤差が生じるこ
とはないが、ループ系を構成する回路が発振するのを防
止するために、積分回路(8)を組入れてカットオフ周
波数を低くする必要がある。ところが、このようにカッ
トオフ周波数を低(すると、スイッチングレギュレータ
(5)の応答性が悪くなく、水平周波数foの2.変に
追従できなくなり、水平出力回路(6)の破壊を招く虞
れがあった。In addition, in a circuit configuration such as the example shown in Figure 4 which detects the deflection width and applies feedback, there is no error in the deflection width due to the horizontal frequency, but in order to prevent the circuit making up the loop system from oscillating, , it is necessary to incorporate an integrating circuit (8) to lower the cutoff frequency. However, if the cutoff frequency is set to a low value in this way, the responsiveness of the switching regulator (5) will not be bad, and it will not be able to follow the 2.0 change in horizontal frequency fo, which may lead to destruction of the horizontal output circuit (6). there were.
本発明は之等の点に鑑み、水平周波数の変化に追従して
良好な水平偏向が行える水平偏向回路を提供することを
目的とする。In view of these points, it is an object of the present invention to provide a horizontal deflection circuit that can perform good horizontal deflection by following changes in horizontal frequency.
本発明の水平偏向回路は、例えは第1図に示す如く、複
数の水平周波数に対応したマルチスキャン方式のテレビ
ジョン受像機の水平偏向回路において、入力映像信号の
偏向幅検出手段(18)と、この偏向幅検出手段(18
)の検出信号と入力映像信号の水平方向の画面サイズに
比例した画面サイズ信号とを比較する比較手段(20)
と、偏向幅検出信号と画面サイズ信号とを加算する加算
手段(15)と、入力映像信号の水平周波数に比例した
電圧信号を発生ずる電圧信号発生手段(12)と、加算
手段(15)の出力信号と電圧信号発生手段(12)の
出力信号とを乗算する乗算手段(13)とを設け、乗算
手段(13)の出力信号により水平出力回路(17)を
制御するようにしたものである。The horizontal deflection circuit of the present invention, as shown in FIG. , this deflection width detection means (18
) and a screen size signal proportional to the horizontal screen size of the input video signal (20)
, an adding means (15) for adding the deflection width detection signal and the screen size signal, a voltage signal generating means (12) for generating a voltage signal proportional to the horizontal frequency of the input video signal, and an adding means (15) for adding the deflection width detection signal and the screen size signal. A multiplication means (13) for multiplying the output signal by the output signal of the voltage signal generation means (12) is provided, and the horizontal output circuit (17) is controlled by the output signal of the multiplication means (13). .
(作用)
斯かる構成によると、入力映像信号の水平周波数に比例
して変化する電圧信号による応答性の速い制御と、実際
の偏向幅と画面サイズとの比較による誤差のない制御と
の双方の制御が行われ、速い応答性により水平周波数の
2激な変化に追随した誤差のない良好な水平偏向が行わ
れる。(Function) According to such a configuration, it is possible to achieve both quick responsive control using a voltage signal that changes in proportion to the horizontal frequency of the input video signal, and error-free control based on a comparison between the actual deflection width and screen size. The control is performed, and due to the fast response, good horizontal deflection is performed without any errors that follow sudden changes in the horizontal frequency.
以下、本発明の水平偏向回路の一実施例を、第1図を参
照して説明しよう。Hereinafter, one embodiment of the horizontal deflection circuit of the present invention will be described with reference to FIG.
本例はマルチスキャン方式のテレビジョン受像機に適用
される水平偏向回路で、第1図において、(11)は水
平同期信号入力端子を示し、この入力端子(11)には
、このテレビジョン受像機への入力映像信号の水平同期
信号が供給される。そして、この入力端子(11)に得
られる水平同期信号を、周波数・電圧変換器(12)に
供給し、水平同期信号の周波数に比例して変化する電圧
信号に変換する。そして、この周波数・電圧変換器(1
2)が出力する電圧信号を、乗算器(13)の一方の入
力端子に供給す、 る。また、図中(14)は表示さ
せる画面サイズにより決まる偏向幅に比例した電圧の偏
向制御信号入力端子を示し、この入力端子(14)に得
られる偏向制御信号を、加算器(15)の一方の入力端
子に供給する。この場合、偏向制御信号としては、例え
ば通常の画面サイズとするとき1vになり、この通常時
の半分の画面サイズとするとき0.5Vになる電圧信号
とする。そして、この加算器(15)の他方の入力端子
には、後述する比較器(20)が出力する差信号が供給
され、偏向制御信号に差信号を加算する。そして、加算
器(15)が出力する加算信号を、乗算器(13)の他
方の入力端子に供給する。そして、この乗算器(13)
で、水平同期信号の周波数に応じた電圧信号を、加算信
号に応じて乗算により変化させ、乗算信号をスイッチン
グレギュレータ(16)に制御信号として供給する。そ
して、このスイッチングレギュレータ(16)が乗算信
号に応じて出力する直流出力信号を、水平出力回路(1
7)に電源信号として供給し、入力端子(11)に得ら
れる水平同期信号をこの水平出力回路(17)に供給し
、水平同期信号に基づいた周期の水平偏向用出力信号を
、水平偏向コイル(図示せず)側と接続された出力端子
(17a)に得る。This example is a horizontal deflection circuit applied to a multi-scan type television receiver. In Fig. 1, (11) indicates a horizontal synchronizing signal input terminal, and this input terminal (11) A horizontal synchronization signal of the input video signal to the machine is supplied. Then, the horizontal synchronizing signal obtained at this input terminal (11) is supplied to a frequency/voltage converter (12) and converted into a voltage signal that changes in proportion to the frequency of the horizontal synchronizing signal. And this frequency/voltage converter (1
2) supplies the voltage signal output by the multiplier (13) to one input terminal of the multiplier (13). In addition, (14) in the figure indicates a deflection control signal input terminal with a voltage proportional to the deflection width determined by the screen size to be displayed, and the deflection control signal obtained at this input terminal (14) is input to one side of the adder (15). Supplied to the input terminal of In this case, the deflection control signal is, for example, a voltage signal that is 1 V when the screen size is normal and 0.5 V when the screen size is half of the normal screen size. The other input terminal of this adder (15) is supplied with a difference signal output from a comparator (20), which will be described later, and adds the difference signal to the deflection control signal. The addition signal output by the adder (15) is then supplied to the other input terminal of the multiplier (13). And this multiplier (13)
Then, a voltage signal corresponding to the frequency of the horizontal synchronizing signal is changed by multiplication according to the addition signal, and the multiplication signal is supplied to the switching regulator (16) as a control signal. This switching regulator (16) outputs a DC output signal according to the multiplication signal to a horizontal output circuit (1
7) as a power signal, and a horizontal synchronization signal obtained at the input terminal (11) is supplied to this horizontal output circuit (17), and an output signal for horizontal deflection with a period based on the horizontal synchronization signal is sent to the horizontal deflection coil. (not shown) is connected to the output terminal (17a).
そして本例においては、この水平出力回路(17)の出
力信号を偏向幅検出回路(18)に供給する。この偏向
幅検出回路(18)が水平出力回路(エフ)の出力信号
より水平偏向幅を検出し、検出信号を積分回路(19)
により積分した後、比較器(20)の一方の比較信号入
力端子に供給する。そして、偏向制御信号入力端子(1
4)に得られる偏向幅に比例した偏向制御信号を、比較
器(20)の他方の比較信号入力端子に供給し、この比
較器(20)で制御信号により示される実際の偏向幅と
を比較する。そして、比較の結果出力される差信号を加
算器(15)の他方の入力端子に供給する。In this example, the output signal of the horizontal output circuit (17) is supplied to the deflection width detection circuit (18). This deflection width detection circuit (18) detects the horizontal deflection width from the output signal of the horizontal output circuit (F), and the detection signal is sent to the integration circuit (19).
After integrating the signal, the signal is supplied to one comparison signal input terminal of the comparator (20). Then, the deflection control signal input terminal (1
A deflection control signal proportional to the deflection width obtained in step 4) is supplied to the other comparison signal input terminal of the comparator (20), and this comparator (20) compares it with the actual deflection width indicated by the control signal. do. Then, the difference signal output as a result of the comparison is supplied to the other input terminal of the adder (15).
斯かる偏向回路の動作について説明すると、周波数・電
圧変換器(12)が出力する電圧信号は、入力端子(1
1)に得られる水平同期信号の周波数に基づいた信号に
なる。そして、加算器(15)で加算する信号は、入力
端子(14)に得られる偏向制御信号と比較器(20)
が出力する差信号である。ここで、この比較器(20)
では、入力端子(14)に得られ画面サイズにより決ま
る偏向制御信号と、偏向幅検出回路(18)が検出した
水平出力回路(17)での実際の偏向状態の検出信号と
が比較される。即ち、制御しようとする偏向幅と実際の
偏向幅との差が、比較器(20)が出力する差信号で示
される。この差信号と画面サイズにより決まる偏向制御
信号との加算器(15)での加算により、差信号により
補正された偏向制御信号となり、この補正された偏向制
御信号が乗算器(13)に供給される。そして、乗算器
(13)では、水平同期信号の周波数に基づいた電圧信
号が、補正された偏向制御信号との乗算により、制御さ
れる偏向幅に応じて変化し、この乗算された電圧信号が
スイッチングレギュレータ(16)に供給され、この電
圧信号に基づいた電源信号が水平出力回路(17)に供
給される。To explain the operation of such a deflection circuit, the voltage signal output from the frequency/voltage converter (12) is connected to the input terminal (1
The signal is based on the frequency of the horizontal synchronization signal obtained in 1). The signal added by the adder (15) is the deflection control signal obtained at the input terminal (14) and the signal added by the comparator (20).
is the difference signal output by Here, this comparator (20)
Then, the deflection control signal obtained at the input terminal (14) and determined by the screen size is compared with the detection signal of the actual deflection state at the horizontal output circuit (17) detected by the deflection width detection circuit (18). That is, the difference between the deflection width to be controlled and the actual deflection width is indicated by the difference signal output from the comparator (20). By adding this difference signal and the deflection control signal determined by the screen size in the adder (15), a deflection control signal corrected by the difference signal is obtained, and this corrected deflection control signal is supplied to the multiplier (13). Ru. Then, in the multiplier (13), the voltage signal based on the frequency of the horizontal synchronization signal is multiplied by the corrected deflection control signal to change according to the deflection width to be controlled, and this multiplied voltage signal is The voltage signal is supplied to a switching regulator (16), and a power signal based on this voltage signal is supplied to a horizontal output circuit (17).
このようにして水平出力回路(17)に供給される電源
信号が制御されることで、周波数・電圧変換器(12)
による入力映像信号の水平周波数に比例した電源信号の
制御と、比較器(20)による実際の偏向幅と画面サイ
ズに応じた偏向幅との差に基づいた電源信号の制御とが
行われる。この場合、周波数・電圧変換器(12)によ
る入力映像信号の水平周波数に比例した制御は、第5図
に示した如く水平周波数f、により最大で20%程度ま
で誤差が生じるが、周波数・電圧変換器(12)は周波
数変動による応答性が速いため、水平周波数の変動に連
動して、スイッチングレギュレータ(16)の出力電源
が多少の誤差分を含みながらも追随して変化するように
なる。そして、このときの誤差分が比較器(20)で差
信号として検出され、この差信号により偏向制御信号が
補正されることで、乗算器(13)で乗算した後の電圧
信号が誤差補正されたものとなる。従って、スイッチン
グレギュレータ(16)の制御が誤差分なく良好に行わ
れるようになり、水平周波数の変動に対処した誤差のな
い良好な電源信号が水平出力回路(17)に供給され、
水平周波数の変動に追随した画面サイズが変化しない良
好な水平偏向が行われる。By controlling the power signal supplied to the horizontal output circuit (17) in this way, the frequency/voltage converter (12)
Control of the power signal proportional to the horizontal frequency of the input video signal is performed by the comparator (20), and control of the power signal is performed based on the difference between the actual deflection width and the deflection width according to the screen size by the comparator (20). In this case, the control proportional to the horizontal frequency of the input video signal by the frequency/voltage converter (12) causes an error of up to about 20% depending on the horizontal frequency f, as shown in Figure 5, but the frequency/voltage Since the converter (12) has a fast response to frequency fluctuations, the output power of the switching regulator (16) changes in conjunction with horizontal frequency fluctuations, even though it includes some error. Then, the error amount at this time is detected as a difference signal by the comparator (20), and the deflection control signal is corrected by this difference signal, so that the voltage signal after being multiplied by the multiplier (13) is corrected for the error. It becomes something. Therefore, the switching regulator (16) can be properly controlled without errors, and a good power signal without errors that can cope with horizontal frequency fluctuations is supplied to the horizontal output circuit (17).
A good horizontal deflection is achieved in which the screen size does not change following changes in the horizontal frequency.
なお、このときの誤差分は、上述した如く最大でも変動
分の20%程度であるので、比較器(20)で大幅な偏
向幅の違いを検出することがなく、積分回路(19)に
より応答性を遅くしてあっても、補正量が少な(、水平
周波数f、が急変しても水平出力回路(17)が破壊す
ることがない。Note that, as mentioned above, the error at this time is about 20% of the variation at most, so the comparator (20) does not detect a large difference in deflection width, and the integrator circuit (19) responds. Even if the correction amount is small, the horizontal output circuit (17) will not be destroyed even if the horizontal frequency f suddenly changes.
なお、上述実施例においては、入力端子(14)に得ら
れる画面サイズに応じた偏向制御信号を変えることで、
画面サイズ(即ち偏向幅)を変えられるようにしたが、
画面サイズを固定する構成とすることもできる。即ち、
第2図に示す如く、偏向制御信号として、加算器(15
)の一方の入力端子及び比較器(20)の他方の比較信
号入力端子に、基準電源(21)よりの一定電位の信号
を供給するようにする。その他の部分は、第1図例の回
路構成と同様に構成する。In addition, in the above-mentioned embodiment, by changing the deflection control signal according to the screen size obtained at the input terminal (14),
I made it possible to change the screen size (i.e. deflection width), but
It is also possible to configure the screen size to be fixed. That is,
As shown in FIG. 2, an adder (15
) and the other comparison signal input terminal of the comparator (20) are supplied with a constant potential signal from the reference power supply (21). The other parts are configured in the same manner as the circuit configuration in the example shown in FIG.
このようにすることで、比較器(20)では実際の偏向
幅と基準となる一定の偏向幅とが比較され、常に一定の
偏向幅に制御される。By doing so, the comparator (20) compares the actual deflection width with a constant deflection width serving as a reference, and the deflection width is always controlled to be constant.
さらに、本発明は上述実施例に限らず、本発明の要旨を
逸脱することなく、その他種々の構成が取り得ることは
勿論である。Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.
本発明の水平偏向回路によると、水平周波数の変動に迅
速に追随して水平偏向が行われると共に、水平周波数の
変動による画面サイズの変化がない良好な水平偏向が行
われる利益がある。According to the horizontal deflection circuit of the present invention, there is an advantage that horizontal deflection can be performed quickly following fluctuations in horizontal frequency, and good horizontal deflection can be performed without changing the screen size due to fluctuations in horizontal frequency.
図面の簡単な説明
第1図は本発明の水平偏向回路の一実施例を示す構成図
、第2図は本発明の他の実施例を示す構成図、第3図及
び第4図は夫々従来の水平偏向回路の例を示す構成図、
第5図及び第6図は夫々偏向状態の説明に供する線図で
ある。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the horizontal deflection circuit of the present invention, FIG. 2 is a block diagram showing another embodiment of the present invention, and FIGS. A block diagram showing an example of a horizontal deflection circuit,
FIGS. 5 and 6 are diagrams for explaining the deflection state, respectively.
(11)は水平同期信号入力端子、(12)は周波数・
電圧変換器、(I4)は偏向制御信号入力端子、(17
)は水平出力回路、(18)は偏向幅検出回路、(20
)は比較器である。(11) is the horizontal synchronization signal input terminal, (12) is the frequency
voltage converter, (I4) is a deflection control signal input terminal, (17
) is the horizontal output circuit, (18) is the deflection width detection circuit, (20
) is a comparator.
Claims (1)
ビジョン受像機の水平偏向回路において、入力映像信号
偏向幅検出手段と、該偏向幅検出手段の検出信号と入力
映像信号の水平方向の画面サイズに比例した画面サイズ
信号とを比較する比較手段と、該比較手段の比較出力と
上記画面サイズ信号とを加算する加算手段と、入力映像
信号の水平周波数に比例した電圧信号を発生する電圧信
号発生手段と、上記加算手段の出力信号と上記電圧信号
発生手段の出力信号とを乗算する乗算手段とを設け、 上記乗算手段の出力信号により水平出力回路を制御する
ようにしたことを特徴とする水平偏向回路。[Claims] In a horizontal deflection circuit for a multi-scan television receiver that supports a plurality of horizontal frequencies, an input video signal deflection width detection means, a detection signal of the deflection width detection means and a horizontal deflection of the input video signal are provided. a comparison means for comparing the screen size signal proportional to the screen size in the direction, an addition means for adding the comparison output of the comparison means and the screen size signal, and generating a voltage signal proportional to the horizontal frequency of the input video signal. and a multiplication means for multiplying the output signal of the addition means by the output signal of the voltage signal generation means, and the horizontal output circuit is controlled by the output signal of the multiplication means. Characteristic horizontal deflection circuit.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1122447A JP2814556B2 (en) | 1989-05-16 | 1989-05-16 | Horizontal deflection circuit |
EP90305102A EP0398598B1 (en) | 1989-05-16 | 1990-05-11 | Horizontal deflection circuits |
DE69023270T DE69023270T2 (en) | 1989-05-16 | 1990-05-11 | Horizontal deflection circuits. |
KR1019900006967A KR0185390B1 (en) | 1989-05-16 | 1990-05-16 | Horizontal deflection circuits |
US07/524,076 US5023523A (en) | 1989-05-16 | 1990-05-16 | Horizontal deflection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1122447A JP2814556B2 (en) | 1989-05-16 | 1989-05-16 | Horizontal deflection circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02301372A true JPH02301372A (en) | 1990-12-13 |
JP2814556B2 JP2814556B2 (en) | 1998-10-22 |
Family
ID=14836071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1122447A Expired - Lifetime JP2814556B2 (en) | 1989-05-16 | 1989-05-16 | Horizontal deflection circuit |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP2814556B2 (en) |
KR (1) | KR0185390B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06105178A (en) * | 1992-07-25 | 1994-04-15 | Internatl Business Mach Corp <Ibm> | Deflection device for raster scanning crt display device and computer system |
JPH07254996A (en) * | 1994-03-15 | 1995-10-03 | Victor Co Of Japan Ltd | Horizontal deflection circuit |
-
1989
- 1989-05-16 JP JP1122447A patent/JP2814556B2/en not_active Expired - Lifetime
-
1990
- 1990-05-16 KR KR1019900006967A patent/KR0185390B1/en not_active IP Right Cessation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06105178A (en) * | 1992-07-25 | 1994-04-15 | Internatl Business Mach Corp <Ibm> | Deflection device for raster scanning crt display device and computer system |
JPH07254996A (en) * | 1994-03-15 | 1995-10-03 | Victor Co Of Japan Ltd | Horizontal deflection circuit |
Also Published As
Publication number | Publication date |
---|---|
JP2814556B2 (en) | 1998-10-22 |
KR900019459A (en) | 1990-12-24 |
KR0185390B1 (en) | 1999-05-01 |
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