JPH0329570A - Dynamic speed modulation circuit - Google Patents
Dynamic speed modulation circuitInfo
- Publication number
- JPH0329570A JPH0329570A JP16472489A JP16472489A JPH0329570A JP H0329570 A JPH0329570 A JP H0329570A JP 16472489 A JP16472489 A JP 16472489A JP 16472489 A JP16472489 A JP 16472489A JP H0329570 A JPH0329570 A JP H0329570A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- parabolic wave
- signal
- synchronous
- 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
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 230000001360 synchronised effect Effects 0.000 claims description 40
- 238000000926 separation method Methods 0.000 claims description 8
- 230000004069 differentiation Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 1
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- 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、テレビジョン受像機のダイナミック速度変
調回路、例えばNTSC方式のようなコンポジットビデ
オ信号を入力信号とするテレビジョン受像機のダイナミ
ック速度変調回路に関するものである。Detailed Description of the Invention [Industrial Application Field] The present invention relates to a dynamic speed modulation circuit for a television receiver, for example, a dynamic speed modulation circuit for a television receiver that uses a composite video signal such as the NTSC system as an input signal. It is related to circuits.
[従来の技術]
第3図は、従来のテレビジョン受像機の速度変調回路の
構成を示すブロック図であり、速度変調回路(1a)は
、コンポジットビデオ信号を入力する人力端子(2)を
有しており、人力端子(2)にはコンポジットビデオ信
号を処理する映像回路(3)およびコンポジットビデオ
信号の2次微分出力を得る2次微分回路(4)が接続さ
れている。[Prior Art] Fig. 3 is a block diagram showing the configuration of a speed modulation circuit of a conventional television receiver, and the speed modulation circuit (1a) has a manual terminal (2) for inputting a composite video signal. A video circuit (3) for processing a composite video signal and a second-order differential circuit (4) for obtaining a second-order differential output of the composite video signal are connected to the human input terminal (2).
そして、映像回路(3)の出力側にはブラウン管(5)
が接続されており、2次微分回路(4)の出力側にはブ
ラウン管(5)の速度変調コイル(以下SVMコイルと
いう)(6)が接続されている。And on the output side of the video circuit (3) is a cathode ray tube (5).
A velocity modulation coil (hereinafter referred to as SVM coil) (6) of a cathode ray tube (5) is connected to the output side of the second-order differential circuit (4).
次に動作について説明する。Next, the operation will be explained.
入力端子(2)から映像回路(3)および2次微分回路
(4)に第4図(a)に示すような波形のコンポジット
ビデオ信号(1 0 0)が入力されると、映像回路(
3)の出力波形は変化しないが、2次微分回路(4)の
出力波形は第4図(b)のようになる。When a composite video signal (1 0 0) having a waveform as shown in FIG. 4(a) is input from the input terminal (2) to the video circuit (3) and the second order differential circuit (4), the video circuit (
Although the output waveform of step 3) does not change, the output waveform of the second-order differentiator circuit (4) becomes as shown in FIG. 4(b).
それから、映像回路(3)の出力はブラウン管(5)に
入力され、2次微分回路(4)の出力(第4図(b)参
照)はSvMコイル(6)に入力される。Then, the output of the video circuit (3) is input to the cathode ray tube (5), and the output of the second order differential circuit (4) (see FIG. 4(b)) is input to the SvM coil (6).
この際、ビームの走査速度は第4図(C)となり、ブラ
ウン管(5)に表示される輝度は第4図(d)となり、
輪郭が強調された速度変調となる。At this time, the scanning speed of the beam is as shown in Fig. 4(C), and the brightness displayed on the cathode ray tube (5) is as shown in Fig. 4(d).
This results in speed modulation with emphasized contours.
[発明が解決しようとする課題]
ところで、従来のテレビジョン受像機は、フォーカスが
画面の周辺部で劣る、例えば、第5図に示すように、画
面中央のA点に比べB, C, D,E点はフォーカス
が劣り、F,(;,H,1点では更にフォーカスが劣る
という問題点があった。[Problems to be Solved by the Invention] By the way, in conventional television receivers, the focus is poor at the periphery of the screen. For example, as shown in FIG. , E points have poor focus, and F, (;, H, 1 point has a problem that focus is even worse.
このため、従来のテレビジョン受像機の速度変調回路は
、ビームの走査速度が映像信号の2次微分のみで決まる
ため、フォーカスの劣る画面の周辺部では速度変調の効
果が十分得られないという課題があった。For this reason, in the speed modulation circuit of conventional television receivers, the scanning speed of the beam is determined only by the second derivative of the video signal, so the problem is that the speed modulation effect cannot be sufficiently achieved in the peripheral areas of the screen where focus is poor. was there.
この発明は、上記のような課題を解消するためになされ
たもので、画面の周辺部でも速度変調の効果を得られる
ダイナミック速度変調回路を得ることを目的とする。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a dynamic speed modulation circuit that can obtain speed modulation effects even in the peripheral areas of the screen.
[課題を解決するための手段]
この発明に係わるダイナミック速度変調回路は、コンポ
ジットビデオ信号を増幅処理する映像回路と、コンポジ
ットビデオ信号の2次微分出力を得る2次微分回路と、
コンポジットビデオ信号から垂直同期信号および水平同
期信号を分離する同期分離回路と、垂直同期信号から垂
直同期パラボラ波を発生する垂直同期パラボラ波発生回
路と、水平同期信号から水平同期パラボラ波を発生する
水平同期パラボラ波発生回路と、垂直同期パラボラ波と
水平同期パラボラ波とを乗算する第1の乗算器と、2次
微分回路出力と第1の乗算器出力とを乗算する第2の乗
算器とを備えたものである。[Means for Solving the Problems] A dynamic speed modulation circuit according to the present invention includes: a video circuit that amplifies a composite video signal; a second-order differential circuit that obtains a second-order differential output of the composite video signal;
A sync separation circuit that separates a vertical sync signal and a horizontal sync signal from a composite video signal, a vertical sync parabolic wave generation circuit that generates a vertical sync parabolic wave from the vertical sync signal, and a horizontal sync circuit that generates a horizontal sync parabolic wave from the horizontal sync signal. A synchronous parabolic wave generation circuit, a first multiplier that multiplies a vertical synchronous parabolic wave and a horizontal synchronous parabolic wave, and a second multiplier that multiplies an output of a second order differential circuit and an output of the first multiplier. It is prepared.
この発明におけるダイナミック速度変調回路は、人力さ
れるコンポジットビデオ信号を映像回路により増幅処理
し、2次微分回路によりコンポジットビデオ信号の2次
微分出力を得、同期分離回路によりコンポジットビデオ
信号から垂直同期信号および水平同期信号を分離し、垂
直同期パラボラ波発生回路により垂直同期信号から垂直
同期パラボラ波を発生し、水平同期パラボラ波発生回路
により水平同期信号から水平同期パラボラ波を発生し、
第1の乗算器により垂直同期パラボラ波と水平同期パラ
ボラ波とを乗算し、第2の乗算器により2次微分回路出
力と第1の乗算器出力とを乗算し、画面の周辺部におい
て2次微分信号の振幅を大きくする。The dynamic speed modulation circuit of the present invention amplifies and processes a human-powered composite video signal using a video circuit, obtains a second-order differential output of the composite video signal using a second-order differentiator, and converts a vertical synchronization signal from the composite video signal using a synchronization separation circuit. and a horizontal synchronization signal, a vertical synchronization parabola wave generation circuit generates a vertical synchronization parabola wave from the vertical synchronization signal, a horizontal synchronization parabola wave generation circuit generates a horizontal synchronization parabola wave from the horizontal synchronization signal,
The first multiplier multiplies the vertically synchronized parabolic wave and the horizontally synchronized parabolic wave, and the second multiplier multiplies the second-order differential circuit output and the first multiplier output. Increase the amplitude of the differential signal.
[丈施例] 以下、この発明の一実施例を図について説明する。[Length example] An embodiment of the present invention will be described below with reference to the drawings.
第1図において、速度変調回路(1)は、コンポジット
ビデオ信号を人力する人力端子(2)を有しており、入
力端子(2)にはコンポジットビデオ信号を処理する映
像回路(3)、コンポジットビデオ信号の2次微分出力
を得る2次微分回路(4)およびコンポジットビデオ信
号から垂直同期信号および水平同期信号を分離する同期
分離回路(7)が接続されている。In FIG. 1, the speed modulation circuit (1) has a manual terminal (2) for manually inputting a composite video signal, and the input terminal (2) has a video circuit (3) for processing the composite video signal, a composite A second-order differentiation circuit (4) that obtains a second-order differential output of the video signal and a synchronization separation circuit (7) that separates a vertical synchronization signal and a horizontal synchronization signal from the composite video signal are connected.
そして、映像回路(3)の出力側には映像を表示するブ
ラウン管(5)が接続されており、同期分離回路(7)
の出力側には垂直同期信号から垂直同期パラボラ波を発
生する垂直同期パラボラ波発生回路(8)が接続されか
つ水平同期信号から水平同期パラボラ波を発生する水平
同期パラボラ波発生回路(9)が接続されており、垂直
同期パラボラ波発生回路(8)および水平同期パラボラ
波発生回路(9)の出力側には垂直同期パラボラ波発生
回路(8)の出力と水平同期パラボラ波発生回路(9)
の出力とを乗算する第1の乗算器(10)が接続されて
いる。A cathode ray tube (5) for displaying images is connected to the output side of the video circuit (3), and a synchronization separation circuit (7)
A vertically synchronized parabolic wave generating circuit (8) for generating a vertically synchronized parabolic wave from a vertically synchronized signal is connected to the output side of the circuit, and a horizontally synchronized parabolic wave generating circuit (9) for generating a horizontally synchronized parabolic wave from a horizontally synchronized signal is connected. The output side of the vertical synchronous parabolic wave generation circuit (8) and the horizontal synchronous parabolic wave generation circuit (9) are connected to the output of the vertical synchronous parabolic wave generation circuit (8) and the horizontal synchronous parabolic wave generation circuit (9).
A first multiplier (10) for multiplying the output by the output of the first multiplier (10) is connected.
また、第1の乗算器(10)の出力側かつ2次微分回路
(4)の出力側には第1の乗算器(10)の出力と2次
微分回路(4)の出力とを乗算する第2の乗算器(11
)が接続されており、第2の乗算器(l1)の出力側に
はブラウン管(5)のSVMコイル(6)が接続されて
いる。Further, the output side of the first multiplier (10) and the output side of the second-order differentiator circuit (4) are multiplied by the output of the first multiplier (10) and the output of the second-order differentiator circuit (4). Second multiplier (11
) is connected, and the SVM coil (6) of the cathode ray tube (5) is connected to the output side of the second multiplier (l1).
ついで、本実施例の作用について説明する。Next, the operation of this embodiment will be explained.
人力端子(2)から映像回路(3)、2次微分回路(4
)および同期分離回路(7)に第2図(d)に示すよう
な波形のコンポジットビデオ信号(1 0 0)が人力
されると、映像回路(3)の出力波形は変化せず、2次
微分回路(4)の出力波形は第4図(b)のようになり
、同期分離回路(7)はコンポジットビデオ信号(10
0)から垂直同期信号および水平同期信号を分離する。From the human power terminal (2) to the video circuit (3) and the second-order differential circuit (4)
) and the synchronization separation circuit (7), when a composite video signal (1 0 0) with a waveform as shown in Fig. 2(d) is input manually, the output waveform of the video circuit (3) does not change and the secondary The output waveform of the differentiating circuit (4) is as shown in FIG.
0) to separate the vertical synchronization signal and horizontal synchronization signal.
そして、同期分離回路(7)により分離された垂直同期
信号は垂直同期パラボラ波発生回路(8)に人力され、
水平同期信号は水平同期パラボラ波発生回路(9)に人
力される。The vertical synchronization signal separated by the synchronization separation circuit (7) is then manually inputted to the vertical synchronization parabolic wave generation circuit (8).
The horizontal synchronization signal is manually input to a horizontal synchronization parabolic wave generation circuit (9).
それから、垂直同期信号を人力した垂直同期パラボラ波
発生回路(8)は垂直同期パラボラ波(第2図(b)参
照)を発生し、水平同期信号を人力した水平同期パラボ
ラ波発生回路(9)は水平同期パラボラ波(第2図(a
)参照)を発生する。なお、図中Vは垂直同期、Hは水
平同期であり、NTSC方式の場合、V−60Hz,H
−15kHzである。Then, the vertical synchronous parabolic wave generation circuit (8) which manually inputs the vertical synchronous signal generates a vertical synchronous parabolic wave (see Figure 2 (b)), and the horizontal synchronous parabolic wave generator circuit (9) which manually inputs the horizontal synchronous signal. is a horizontally synchronous parabolic wave (Fig. 2 (a)
)) occurs. In addition, V in the figure is vertical synchronization, H is horizontal synchronization, and in the case of NTSC system, V-60Hz, H
-15kHz.
更に、垂直同期パラボラ波発生回路(8)により発生さ
れた垂直同期パラボラ波と水平同期パラボラ波発生回路
(9)により発生された水平同期パラボラ波は第1の乗
算器(10)に入力されて乗算され、第2図(C)のよ
うな波形となる。Further, the vertical synchronous parabolic wave generated by the vertical synchronous parabolic wave generation circuit (8) and the horizontal synchronous parabolic wave generated by the horizontal synchronous parabolic wave generation circuit (9) are input to the first multiplier (10). The signals are multiplied and a waveform as shown in FIG. 2(C) is obtained.
そして、TS1の乗算器(10)の出力(第2図(c)
参照)と2次微分回路(4)の出力(第4図(b)参照
)とは第2の乗算器(11)に人力されて乗算され、第
2の乗算器(11)の出力はSVMコイル(6)に入力
される。Then, the output of the multiplier (10) of TS1 (Fig. 2(c)
) and the output of the second-order differential circuit (4) (see Fig. 4(b)) are manually multiplied by the second multiplier (11), and the output of the second multiplier (11) is multiplied by the SVM. It is input to the coil (6).
この際、映像信号が第2図(d)のような波形だった場
合、2次微分回路(4)、第2の乗算器(11)および
SVMコイル(6)により得られる走査速度は第2図(
e)のような波形で表せられ、画面の周辺部で振幅の大
きな速度変調を行える。At this time, if the video signal has a waveform as shown in FIG. figure(
It is represented by a waveform like e), and it is possible to perform velocity modulation with a large amplitude in the peripheral area of the screen.
[発明の効果コ
以上説明したように、この発明によれば、コンポジット
ビデオ信号の2次微分波形を画面の中央に比べて周辺部
で振幅が大きくなるように構或したので、フォーカスの
劣る画面の周辺部でも速度変調の効果を十分得ることが
できる。[Effects of the Invention] As explained above, according to the present invention, the amplitude of the second-order differential waveform of a composite video signal is larger at the periphery than at the center of the screen. The effect of speed modulation can be sufficiently obtained even in the peripheral area of the vehicle.
第1図はこの発明の一実施例によるダイナミック速度変
2J回路の構成を示すブロック図、第2図は速度変調回
路の各部での波形を示す図、第3図は従来の速度変調回
路の構或を示すブロック図、第4図は従来の速度変調回
路の各部での波形を示す図、第5図は受像機のフォーカ
スを説明するための図である。
図中、(1), (1 a)は速度変調回路、(3)
は映像回路、(4)は2次微分回路、(7)は同期分離
回路、(8)は垂直同期パラボラ波発生回路、(9)は
水平同期パラボラ波発生同路、(10)は第1の乗算器
、(11)は第2の乗算器である。
なお、図中同一符号は同一または相当部分を示すOFIG. 1 is a block diagram showing the configuration of a dynamic speed varying 2J circuit according to an embodiment of the present invention, FIG. 2 is a diagram showing waveforms at various parts of the speed modulation circuit, and FIG. 3 is a diagram showing the configuration of a conventional speed modulation circuit. FIG. 4 is a diagram showing waveforms at various parts of a conventional speed modulation circuit, and FIG. 5 is a diagram for explaining focus of a receiver. In the figure, (1) and (1a) are speed modulation circuits, (3)
is a video circuit, (4) is a second-order differential circuit, (7) is a synchronous separation circuit, (8) is a vertical synchronous parabolic wave generation circuit, (9) is a horizontal synchronous parabolic wave generation circuit, (10) is a first (11) is the second multiplier. In addition, the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
調回路において、コンポジットビデオ信号を増幅処理す
る映像回路と、コンポジットビデオ信号の2次微分出力
を得る2次微分回路と、コンポジットビデオ信号から垂
直同期信号および水平同期信号を分離する同期分離回路
と、垂直同期信号から垂直同期パラボラ波を発生する垂
直同期パラボラ波発生回路と、水平同期信号から水平同
期パラボラ波を発生する水平同期パラボラ波発生回路と
、垂直同期パラボラ波と水平同期パラボラ波とを乗算す
る第1の乗算器と、2次微分回路出力と第1の乗算器出
力とを乗算する第2の乗算器とを備えたことを特徴とす
るダイナミック速度変調回路。In a dynamic speed modulation circuit that inputs a composite video signal, there is a video circuit that amplifies the composite video signal, a second-order differential circuit that obtains a second-order differential output of the composite video signal, and a vertical synchronization signal and a horizontal synchronization signal from the composite video signal. A synchronous separation circuit that separates the vertical synchronous parabolic waves, a vertical synchronous parabolic wave generation circuit that generates a vertical synchronous parabolic wave from a vertical synchronous signal, a horizontal synchronous parabolic wave generation circuit that generates a horizontal synchronous parabolic wave from a horizontal synchronous signal, and a vertical synchronous parabolic wave generation circuit that generates a horizontal synchronous parabolic wave from a horizontal synchronous signal. A dynamic speed modulation circuit comprising: a first multiplier for multiplying by a horizontal synchronous parabolic wave; and a second multiplier for multiplying a second-order differentiation circuit output by a first multiplier output. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16472489A JPH0329570A (en) | 1989-06-27 | 1989-06-27 | Dynamic speed modulation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16472489A JPH0329570A (en) | 1989-06-27 | 1989-06-27 | Dynamic speed modulation circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0329570A true JPH0329570A (en) | 1991-02-07 |
Family
ID=15798690
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16472489A Pending JPH0329570A (en) | 1989-06-27 | 1989-06-27 | Dynamic speed modulation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0329570A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4428918A1 (en) * | 1993-08-20 | 1995-02-23 | Metz Werke Gmbh & Co Kg | Circuit arrangement for improving the sharpness of an image on the screen of a cathode ray tube |
EP0689347A1 (en) * | 1994-06-20 | 1995-12-27 | Thomson Consumer Electronics, Inc. | Scan velocity modulation circuit |
EP1056277A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Piece-wise linearized waveform generator for scan velocity modulation circuit |
US6498626B1 (en) | 1999-05-26 | 2002-12-24 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
-
1989
- 1989-06-27 JP JP16472489A patent/JPH0329570A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4428918A1 (en) * | 1993-08-20 | 1995-02-23 | Metz Werke Gmbh & Co Kg | Circuit arrangement for improving the sharpness of an image on the screen of a cathode ray tube |
EP0689347A1 (en) * | 1994-06-20 | 1995-12-27 | Thomson Consumer Electronics, Inc. | Scan velocity modulation circuit |
US5600381A (en) * | 1994-06-20 | 1997-02-04 | Thomsom Consumer Electronics, Inc. | Scan velocity modulation circuit |
EP1056277A1 (en) * | 1999-05-26 | 2000-11-29 | Thomson Licensing S.A. | Piece-wise linearized waveform generator for scan velocity modulation circuit |
US6295097B1 (en) | 1999-05-26 | 2001-09-25 | Thomson Licensing S.A. | Piece-wise linearized waveform generator for scan velocity modulation circuit |
US6498626B1 (en) | 1999-05-26 | 2002-12-24 | Thomson Licensing S.A. | Video signal processing arrangement for scan velocity modulation circuit |
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