JPH06217160A - Speed modulator - Google Patents
Speed modulatorInfo
- Publication number
- JPH06217160A JPH06217160A JP50A JP718893A JPH06217160A JP H06217160 A JPH06217160 A JP H06217160A JP 50 A JP50 A JP 50A JP 718893 A JP718893 A JP 718893A JP H06217160 A JPH06217160 A JP H06217160A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- level
- switching means
- transistor
- differential output
- 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
Landscapes
- Details Of Television Scanning (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は画像の鮮鋭度（シャープ
ネス）を向上させる速度変調装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed modulator for improving the sharpness of an image.
【０００２】[0002]
【従来の技術】テレビジョン受像機には画像の鮮鋭度を
上げる速度変調装置が設けられている。2. Description of the Related Art A television receiver is provided with a speed modulator for increasing the sharpness of an image.
【０００３】この速度変調装置は輝度信号を微分する微
分回路を有し、この微分出力に基づき電子ビームの偏向
速度を変調するもので、従来のテレビジョン受像機では
ＮＴＳＣ信号又はＰＡＬ信号等しか受信しなかったため
速度変調の程度（画像の鮮鋭度の程度）を可変する必要
がなく固定であった。This speed modulator has a differentiating circuit for differentiating a luminance signal, and modulates the deflection speed of an electron beam based on this differential output. A conventional television receiver receives only an NTSC signal or a PAL signal. Since it was not performed, the degree of speed modulation (the degree of sharpness of the image) did not need to be changed and was fixed.
【０００４】[0004]
【発明が解決しようとする課題】ところが、近年では従
来のＮＴＳＣ信号、ＰＡＬ信号等だけでなくハイクオリ
ティーのハイビジョン信号も同時に受信できるテレビジ
ョン受像機が提案されており、従来のＮＴＳＣ信号、Ｐ
ＡＬ信号等とハイビジョン信号とでは最適な速度変調の
程度（画像の鮮鋭度の程度）が異なる。従って、速度変
調の程度を一方に合わせると他方の画質が劣化するとい
う事態が生じる。又、同様な事態は地上放送と衛星放送
を同時に受信できるテレビジョン受像機にも生じる。さ
らに、ユーザによっては好みとする画像の鮮鋭度が異な
る場合もある。However, in recent years, there has been proposed a television receiver capable of simultaneously receiving not only the conventional NTSC signal and PAL signal but also a high-quality high-definition signal.
The optimum degree of speed modulation (the degree of image sharpness) differs between the AL signal and the high-definition signal. Therefore, if the degree of velocity modulation is adjusted to one, the image quality of the other deteriorates. Moreover, a similar situation occurs in a television receiver capable of simultaneously receiving terrestrial broadcasting and satellite broadcasting. Further, depending on the user, the sharpness of the desired image may be different.
【０００５】そこで、本発明は上述の事態に鑑みてなさ
れたもので、速度変調の程度を可変できるようにして最
適な画像が得られる速度変調装置を提供することを課題
とする。Therefore, the present invention has been made in view of the above situation, and it is an object of the present invention to provide a velocity modulation device capable of varying the degree of velocity modulation to obtain an optimum image.
【０００６】[0006]
【課題を解決するための手段】上述課題を達成するため
の本発明に係る速度変調装置は、輝度信号を微分する微
分回路を設け、この微分回路の微分出力に基づき電子ビ
ームの偏向速度を変調する速度変調装置において、前記
微分出力のレベルを可変する切換手段を設けたものであ
る。A velocity modulator according to the present invention for attaining the above-mentioned subject is provided with a differentiating circuit for differentiating a luminance signal, and the deflection velocity of an electron beam is modulated based on the differential output of this differentiating circuit. In the speed modulator, the switching means for varying the level of the differential output is provided.
【０００７】[0007]
【作用】切換手段を切換えると、微分回路の出力レベル
が可変されるため速度変調の程度が可変される。When the switching means is switched, the output level of the differentiating circuit is changed, so that the degree of speed modulation is changed.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面を用いて説明す
る。図１及び図２は本発明の一実施例を示し、この実施
例はＮＴＳＣ信号とハイビジョン信号とを共に受信でき
るテレビジョン受像機に適用した場合を示す。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention, which is applied to a television receiver capable of receiving both NTSC signals and high-definition signals.
【０００９】図１には速度変調装置の回路図が示されて
いる。図１において、輝度信号は切換手段１を介して微
分回路２に供給され、切換手段１はトランジスタＴｒの
オン・オフによって輝度信号のレベルを可変するよう構
成されている。即ち、トランジスタＴｒがオフ状態では
抵抗ＲBと抵抗ＲCの抵抗比率で輝度信号のレベルが決定
され、又、トランジスタＴｒがオン状態では２つの並列
抵抗ＲA及びＲBと抵抗ＲCとの抵抗比率で輝度信号のレ
ベルが決定されるため、トランジスタＴｒがオフ状態で
は輝度信号が高レベル、トランジスタＴｒがオン状態で
は輝度信号が低レベルで微分回路２に入力される。FIG. 1 shows a circuit diagram of the speed modulator. In FIG. 1, the luminance signal is supplied to the differentiating circuit 2 via the switching means 1, and the switching means 1 is configured to change the level of the luminance signal by turning on / off the transistor Tr. That is, when the transistor Tr is in the off state, the level of the luminance signal is determined by the resistance ratio of the resistor R B and the resistor R C , and when the transistor Tr is in the on state, the two parallel resistors R A and R B and the resistor R C are connected. Since the level of the brightness signal is determined by the resistance ratio, the brightness signal is input to the differentiating circuit 2 at a high level when the transistor Tr is off and at a low level when the transistor Tr is on.
【００１０】トランジスタＴｒの制御はマイクロコンピ
ュータ３のコントロール信号によって行われ、マイクロ
コンピュータ３は入力ビデオ信号がＮＴＳＣ信号の場合
にはＬＯＷ信号を、ハイビジョン信号の場合にはＨＩＧ
Ｈ信号をそれぞれ出力する。The transistor Tr is controlled by a control signal from the microcomputer 3. The microcomputer 3 sends a LOW signal when the input video signal is an NTSC signal and a HIG signal when the input video signal is a high-definition signal.
The H signal is output respectively.
【００１１】前記微分回路２は輝度信号を微分し、この
微分信号がリミッタ４で所定の上下限レベルでカットさ
れてドライブ回路５に供給される。このドライブ回路５
は微分信号を増幅し、速度変調用コイルＬ1に出力す
る。速度変調用コイルＬ1は電子ビームに対して偏向磁
界を発生するよう配置されている。The differentiation circuit 2 differentiates the luminance signal, and the differentiation signal is cut by the limiter 4 at predetermined upper and lower limits and supplied to the drive circuit 5. This drive circuit 5
Amplifies the differential signal and outputs it to the velocity modulation coil L 1 . The velocity modulation coil L 1 is arranged to generate a deflection magnetic field for the electron beam.
【００１２】図２には微分回路２、リミッタ４及びドラ
イブ回路５の回路図が示されている。FIG. 2 shows a circuit diagram of the differentiating circuit 2, the limiter 4 and the drive circuit 5.
【００１３】図２において、微分回路２、リミッタ４及
びドライブ回路５は公知の回路であり、微分回路２は負
荷コイルＬ2のリアクタンスによって高周波成分を増幅
することによって輝度信号を微分する。In FIG. 2, the differentiating circuit 2, the limiter 4, and the drive circuit 5 are known circuits, and the differentiating circuit 2 differentiates the luminance signal by amplifying the high frequency component by the reactance of the load coil L 2 .
【００１４】次に、上記構成の作用を説明する。入力ビ
デオ信号がＮＴＳＣ信号の場合にはマイクロコンピュー
タ３はＬＯＷ信号を出力するため、トランジスタＴｒは
オフ状態を保持する。すると、ＮＴＳＣ信号の輝度信号
は高レベルで微分回路２に入力されるため、高レベルの
微分出力が得られる。従って、強く鮮鋭度をかけた画像
が映出され、ＮＴＳＣ信号にとって最適な画質が得られ
る。Next, the operation of the above configuration will be described. When the input video signal is the NTSC signal, the microcomputer 3 outputs the LOW signal, so that the transistor Tr maintains the off state. Then, the luminance signal of the NTSC signal is input to the differentiating circuit 2 at a high level, so that a high-level differential output is obtained. Therefore, an image with strong sharpness is displayed, and the optimum image quality is obtained for the NTSC signal.
【００１５】また、入力ビデオ信号がハイビジョン信号
の場合にはマイクロコンピュータ３はＨＩＧＨ信号を出
力するため、トランジスタＴｒはオン状態を保持する。
すると、ハイビジョン信号の輝度信号は低レベルで微分
回路２に入力されるため、高レベルの微分出力が得られ
る。従って、弱く鮮鋭度をかけた画像が映出され、ハイ
ビジョン信号にとって最適な画質が得られる。When the input video signal is a high-definition signal, the microcomputer 3 outputs a HIGH signal, so that the transistor Tr keeps the ON state.
Then, the luminance signal of the high-definition signal is input to the differentiating circuit 2 at a low level, so that a high-level differential output is obtained. Therefore, a weakly sharpened image is displayed, and the optimum image quality is obtained for the high-definition signal.
【００１６】上記実施例ではＮＴＳＣ信号とハイビジョ
ン信号を同時に受信する場合について示したが、従来の
ＰＡＬ信号等とハイビジョン信号を同時に受信する場合
でも、又、衛星放送（ＢＳ／ＣＳ）と地上放送（例えば
ＮＴＳＣ）を同時に受信する場合でも同様に適用でき
る。衛星放送と地上放送を同時に受信する場合には衛星
放送受信時に微分出力のレベルを低く、地上放送受信時
に微分出力のレベルを高くするよう切換手段１を構成す
る。In the above embodiment, the case of receiving the NTSC signal and the high-definition signal at the same time has been described, but even when the conventional PAL signal and the like and the high-definition signal are simultaneously received, the satellite broadcasting (BS / CS) and the terrestrial broadcasting (BS / CS) are also received. The same applies to the case of simultaneously receiving, for example, NTSC. When satellite broadcasting and terrestrial broadcasting are simultaneously received, the switching means 1 is configured so that the differential output level is low when the satellite broadcasting is received and the differential output level is high when the terrestrial broadcasting is received.
【００１７】図３には他の実施例を示す切換手段１の回
路図が示されている。図３において、切換手段１はユー
ザの操作によってオン・オフするスイッチＳＷを有し、
このスイッチＳＷがオンするとトランジスタＴｒがオフ
し、スイッチＳＷがオフするとトランジスタＴｒがオン
する。トランジスタＴｒがオフ状態では輝度信号がその
ままの高レベルで、トランジスタＴｒがオン状態では抵
抗ＲAと抵抗ＲCの抵抗比率で輝度信号のレベルが決定さ
れるため低レベルで微分回路に入力される。他の構成は
前記実施例と同様であるため説明を省略する。FIG. 3 shows a circuit diagram of the switching means 1 showing another embodiment. In FIG. 3, the switching means 1 has a switch SW that is turned on / off by a user operation,
When the switch SW is turned on, the transistor Tr is turned off, and when the switch SW is turned off, the transistor Tr is turned on. When the transistor Tr is in the off state, the brightness signal is at the high level as it is, and when the transistor Tr is in the on state, the level of the brightness signal is determined by the resistance ratio of the resistors R A and R C , so that the low level is input to the differentiating circuit. . The rest of the configuration is similar to that of the above-mentioned embodiment, so the explanation is omitted.
【００１８】この実施例によれば、ユーザがスイッチＳ
Ｗをオンすれば、高レベルの輝度信号が微分回路に供給
されるため、強く鮮鋭度をかけた画像が映出され、又、
スイッチＳＷをオフすれば、低レベルの輝度信号が微分
回路に供給されるため弱く鮮鋭度をかけた画像が映出さ
れる。従って、ユーザの好みに応じた画質が得られる。According to this embodiment, the user selects the switch S
When W is turned on, a high-level luminance signal is supplied to the differentiating circuit, so an image with strong sharpness is displayed, and
When the switch SW is turned off, a low-level luminance signal is supplied to the differentiating circuit, so that a weakly sharpened image is displayed. Therefore, the image quality according to the user's preference can be obtained.
【００１９】尚、上記２つの実施例では微分回路２に入
力される輝度信号のレベルを可変することによって微分
出力を可変するよう構成したが、微分入力信号ではなく
微分出力自体のレベルを可変させても良い。又、上記２
つの実施例では微分出力を２段階に可変できるよう構成
したが、３段階以上に可変できるよう構成すればさらに
きめ細かな鮮鋭度の調整が可能となる。In the above two embodiments, the differential output is varied by varying the level of the luminance signal input to the differentiating circuit 2. However, the level of the differential output itself is varied instead of the differential input signal. May be. Also, the above 2
In one embodiment, the differential output is configured to be variable in two stages, but if it is configured to be variable in three or more stages, finer adjustment of sharpness can be performed.
【００２０】[0020]
【発明の効果】以上述べたように請求項１から請求項３
の発明によれば、輝度信号の微分出力に基づき電子ビー
ムの偏向速度を変調する速度変調装置において、微分出
力のレベルを可変する切換手段を設けたので、切換手段
で微分出力を可変することにより画像の鮮鋭度の程度が
変わり最適な画像が得られるという効果を奏する。As described above, the first to third aspects are provided.
According to the invention, in the velocity modulator for modulating the deflection velocity of the electron beam based on the differential output of the luminance signal, since the switching means for varying the level of the differential output is provided, the differential output can be varied by the switching means. The effect that the degree of sharpness of an image changes and an optimal image can be obtained.
【００２１】また、請求項２によれば入力ビデオ信号の
種類に応じて切換手段が自動的に切換えられるため、自
動的に最適な画像が得られ、さらに、請求項３によれば
ユーザの操作で切換手段が切換えられるため、ユーザの
好みに応じた画質が得られるという効果がある。According to the second aspect, since the switching means is automatically switched according to the type of the input video signal, an optimum image can be automatically obtained. Further, according to the third aspect, the user operation. Since the switching means is switched by, there is an effect that the image quality according to the user's preference can be obtained.
【図１】速度変調装置の回路図（実施例）。FIG. 1 is a circuit diagram of a velocity modulator (embodiment).
【図２】微分回路、リミッタ及びドライブ回路の回路図
（実施例）。FIG. 2 is a circuit diagram of a differentiating circuit, a limiter and a drive circuit (embodiment).
【図３】切換手段の回路図（他の実施例）。FIG. 3 is a circuit diagram of switching means (another embodiment).
１…切換手段 ２…微分回路 1 ... Switching means 2 ... Differentiating circuit
Claims (3)
の微分回路の微分出力に基づき電子ビームの偏向速度を
変調する速度変調装置において、 前記微分出力のレベルを可変する切換手段を設けたこと
を特徴とする速度変調装置。1. A velocity modulator for providing a differentiating circuit for differentiating a luminance signal and modulating the deflection speed of an electron beam based on the differential output of the differentiating circuit, wherein a switching means for varying the level of the differential output is provided. A speed modulator characterized by.
に応じて自動的に切換えられることを特徴とする請求項
１に記載の速度変調装置。2. The speed modulator according to claim 1, wherein the switching means is automatically switched according to the type of the input video signal.
換えられることを特徴とする請求項１に記載の速度変調
装置。3. The speed modulation device according to claim 1, wherein the switching means is switched by a user operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50A JPH06217160A (en) | 1993-01-20 | 1993-01-20 | Speed modulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50A JPH06217160A (en) | 1993-01-20 | 1993-01-20 | Speed modulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06217160A true JPH06217160A (en) | 1994-08-05 |
Family
ID=11659077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50A Pending JPH06217160A (en) | 1993-01-20 | 1993-01-20 | Speed modulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06217160A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1056276A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Scan velocity modulation circuit with multi-mode operation |
| US6498626B1 (en) | 1999-05-26 | 2002-12-24 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
-
1993
- 1993-01-20 JP JP50A patent/JPH06217160A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1056276A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Scan velocity modulation circuit with multi-mode operation |
| US6493040B1 (en) | 1999-05-26 | 2002-12-10 | Thomson Licensing S.A. | Scan velocity modulation circuit with multi-mode operation |
| US6498626B1 (en) | 1999-05-26 | 2002-12-24 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4081836A (en) | Luminance signal processor for providing signal enhancement | |
| JPH0440171A (en) | Contour compensating device | |
| EP0136824B1 (en) | Automatic contrast reduction circuit for a teletext or monitor operation | |
| CA2026340C (en) | Control of brightness level adapted to control of picture | |
| JP2968609B2 (en) | Television on-screen display | |
| US5107341A (en) | Color television apparatus with picture-in-picture processing and with variable chrominance signal filtering | |
| US5329316A (en) | Contour compensator for video image having overlapping information | |
| JPS58108877A (en) | Automatic video signal peaking and color controller | |
| US5345278A (en) | Contrast and brightness control for television receiver with teletext | |
| JPH0787354A (en) | Beam-scanning-speed modulation apparatus with svm disabling circuit | |
| JPH06217160A (en) | Speed modulator | |
| JPH06205326A (en) | Television receiver | |
| US5748259A (en) | Screen size control circuit according to a power on or off condition of a television | |
| JPH04286492A (en) | Television receiver | |
| US3936869A (en) | Automatic color level circuit with peak detector | |
| JP2002354495A (en) | Television receiver | |
| JP2586851B2 (en) | liquid crystal television | |
| KR920007544Y1 (en) | Circuit for changing resolution in due to state of broadcasting signal | |
| JP2993586B2 (en) | Scan speed modulation circuit | |
| JPS5931913B2 (en) | television receiver | |
| JPH04127680A (en) | Television receiver | |
| JPS63276386A (en) | Television receiver | |
| KR200159403Y1 (en) | Velocity modulation signal correction device | |
| JPS60244177A (en) | Color television receiver | |
| JPH07135576A (en) | Scanning speed modulation device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20070823 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 13 Free format text: PAYMENT UNTIL: 20080823 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080823 Year of fee payment: 13 |