JP3219424B2 - Television signal converter - Google Patents
Television signal converterInfo
- Publication number
- JP3219424B2 JP3219424B2 JP12026591A JP12026591A JP3219424B2 JP 3219424 B2 JP3219424 B2 JP 3219424B2 JP 12026591 A JP12026591 A JP 12026591A JP 12026591 A JP12026591 A JP 12026591A JP 3219424 B2 JP3219424 B2 JP 3219424B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- border
- television signal
- output
- circuit
- 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.)
- Expired - Fee Related
Links
Landscapes
- Television Systems (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明はアスペクト比4:3のN
TSC方式のテレビジョン信号を16:9のHDTV方
式のテレビジョン信号に変換するテレビジョン信号変換
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a television signal converter that converts a TSC television signal into a 16: 9 HDTV television signal.
【0002】[0002]
【従来の技術】従来、アスペクト比4:3のテレビジョ
ン信号を16:9のワイドアスペクト比のディスプレイ
装置に表示する方法として特開昭63−245076号
に示されるものがある。2. Description of the Related Art A method of displaying a television signal having an aspect ratio of 4: 3 on a display device having a wide aspect ratio of 16: 9 is disclosed in Japanese Patent Application Laid-Open No. 63-245076.
【0003】上述の方法においては図3に示す如く画面
両サイドに無信号領域Aが発生する。このため、この無
信号領域にはボーダー信号として固定の灰色を表示する
ようにしていた。In the above-described method, a no-signal area A is generated on both sides of the screen as shown in FIG. For this reason, a fixed gray color is displayed as a border signal in this non-signal area.
【0004】図4にNTSC信号をHDTV信号に変換
するテレビジョン信号変換装置のブロック図を示す。同
図において1は倍速変換部であり、コンポジットNTS
C信号をYC分離してA/D変換した後、水平周波数1
5.734MHzの信号から31.468MHzの倍速
信号へ倍速変換する。2、3はこの倍速変換された輝度
信号Y及び色差信号R−Y、B−Yのそれぞれの時間軸
を14/19に圧縮する第1、第2時間軸圧縮回路、4
はこの第1時間軸圧縮回路2で時間軸圧縮された輝度信
号に連続する無信号期間に所定の灰色のボーダー信号を
付加するボーダー信号付加回路であり、所定の固定値を
発生する固定値発生回路41及び図5イに示すボーダー
期間はこの固定値を選択し、ボーダー期間以外は前記第
1時間軸圧縮回路出力を選択して出力する第1マルチプ
レキサ42で構成される。FIG. 4 shows a block diagram of a television signal converter for converting an NTSC signal into an HDTV signal. In the figure, reference numeral 1 denotes a double speed conversion unit, which is a composite NTS.
After the C signal is YC separated and A / D converted, the horizontal frequency 1
Double-speed conversion is performed from a signal of 5.734 MHz to a double-speed signal of 31.468 MHz. Reference numerals 2 and 3 denote first and second time axis compression circuits for compressing the respective time axes of the double-speed converted luminance signal Y and color difference signals RY and BY to 14/19.
Is a border signal adding circuit for adding a predetermined gray border signal during a non-signal period that is continuous with the luminance signal compressed by the first time axis compression circuit 2 in the time axis compression circuit. The fixed value generation circuit generates a predetermined fixed value. The circuit 41 and a first multiplexer 42 for selecting the fixed value during the border period shown in FIG. 5A and for selecting and outputting the output of the first time axis compression circuit during periods other than the border period.
【0005】5、6はそれぞれ前記ボーダー信号が付加
された輝度信号及び前記第2時間軸圧縮回路3出力であ
る色差信号をD/A変換するD/A変換器、7は輝度信
号の黒レベルを補正する黒レベル補正回路、8はこの出
力の輪郭を強調して補正する輪郭補正回路、9はこの輪
郭補正回路出力と前記色差信号R−Y、B−Yをマトリ
クスしてRGB原色信号を出力するマトリクス回路、1
0は16:9のアスペクト比を有する表示管である。[0005] Reference numerals 5 and 6 denote D / A converters for D / A converting the luminance signal to which the border signal is added and the color difference signal output from the second time base compression circuit 3, respectively. 8 is a contour correction circuit for enhancing and correcting the contour of the output, and 9 is a matrix of the output of the contour correction circuit and the color difference signals RY and BY to obtain RGB primary color signals. Matrix circuit for output, 1
Reference numeral 0 denotes a display tube having an aspect ratio of 16: 9.
【0006】上述のテレビジョン信号変換装置におい
て、アナログ輝度信号(図5ロ)に輪郭補正を施してい
るが、図5ハの如く画面上でボーダー信号部分と映像信
号部分の境界にもピークが付き、これが映像信号の内容
によって変化するため見苦しいという欠点があった。In the above-described television signal converter, the analog luminance signal (b in FIG. 5) is contour-corrected. However, as shown in FIG. 5c, a peak also appears on the boundary between the border signal portion and the video signal portion on the screen. In addition, there is a drawback that it is unsightly because this changes depending on the content of the video signal.
【0007】また、VTR再生時等、クロック再生や同
期分離等の精度の劣化によりジッタが発生し、これによ
り前記ボーダー信号部分と映像信号部分との境界線にゆ
がみが生じるという欠点があった。In addition, jitter occurs due to deterioration in accuracy such as clock reproduction and synchronization separation during VTR reproduction or the like, which causes a problem that a boundary line between the border signal portion and the video signal portion is distorted.
【0008】さらに、ボーダー部分を一定の輝度信号と
しとているため映像信号部分との平均輝度レベルの差に
より表示管10の焼け残りの原因となっていた。Further, since the border portion is made to have a constant luminance signal, the difference in the average luminance level from the video signal portion causes the display tube 10 to remain unburned.
【0009】[0009]
【発明が解決しようとする課題】本発明は上述の点に鑑
み為されたものであり、画面上でボーダー信号部分と映
像信号部分の境界に発生するピーク及び境界線のゆがみ
を解消したテレビジョン信号変換装置を提供するもので
ある。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been made in view of the above, and has been made in view of the above, and has been made in view of the above circumstances. A signal conversion device is provided.
【0010】また、表示管のボーダー部分による焼け残
りを防止したテレビジョン信号変換装置を提供するもの
である。It is another object of the present invention to provide a television signal converter in which unburned portions due to a border portion of a display tube are prevented.
【0011】[0011]
【課題を解決するための手段】本発明は、画面のアスペ
クト比が4:3のテレビジョン信号を時間軸圧縮する手
段と、この時間軸圧縮した信号に連続する無信号期間に
所定輝度レベルを有するボーダー信号を付加するボーダ
ー信号付加手段と、このボーダー信号付加手段出力の輪
郭を補正する輪郭補正回路とを備えるアスペクト比を変
換するためのテレビジョン信号変換装置において、前記
輪郭補正回路の前段に、前記時間軸圧縮した信号とボー
ダー信号との境界部分を平滑する水平ローパスフィルタ
及び若しくは垂直ローパスフィルタを備えてなるテレビ
ジョン信号変換装置である。According to the present invention, there is provided a means for compressing a television signal having a screen aspect ratio of 4: 3 on the time axis, and a predetermined luminance level during a non-signal period following the time axis compressed signal. In a television signal converter for converting an aspect ratio, comprising a border signal adding means for adding a border signal having the same, and a contour correcting circuit for correcting the contour of the output of the border signal adding means, A television signal conversion device including a horizontal low-pass filter and / or a vertical low-pass filter for smoothing a boundary portion between the time-axis-compressed signal and the border signal.
【0012】[0012]
【0013】[0013]
【作用】上述の手段により、輝度信号を輪郭補正する前
に予め時間軸圧縮した信号とボーダー信号との境界部分
を平滑するよう作用する。According to the above-mentioned means, before the contour correction of the luminance signal is performed, the boundary portion between the signal compressed in the time axis in advance and the border signal is smoothed.
【0014】また、ボーダー信号の輝度レベルは入力映
像信号の平均輝度レベルに応じて変化するよう作用す
る。Further, the luminance level of the border signal operates so as to change according to the average luminance level of the input video signal.
【0015】[0015]
【実施例】以下、図面に基づき本発明の一実施例を説明
する。An embodiment of the present invention will be described below with reference to the drawings.
【0016】図1は本実施例におけるテレビジョン信号
変換装置であり、図4と同一部分には同一符号を付し説
明を省略する。FIG. 1 shows a television signal conversion apparatus according to the present embodiment. The same parts as those in FIG.
【0017】本実施例の第1の特徴は入力映像信号の平
均輝度レベルに応じて前記ボーダー信号の輝度レベルを
変化させる点である。即ち、ボーダー信号付加回路を以
下の回路で構成する。43は同期信号除去後の映像信号
の平均輝度レベル(APL)を検出するAPL検出回
路、44はこの出力をA/D変換するA/D変換回、4
5はこのA/D変換出力を長時間(10分〜60分)平
均化する平均化回路であり、この平均化されたデータが
第1マルチプレキサ42に供給される。これにより表示
管の螢光膜に衝突する電子ビーム量はボーダー期間と映
像期間とで均一になるため焼け残りが防止される。The first feature of this embodiment is that the luminance level of the border signal is changed according to the average luminance level of the input video signal. That is, the border signal adding circuit is constituted by the following circuits. An APL detection circuit 43 detects an average luminance level (APL) of the video signal after removing the synchronization signal, and an A / D conversion circuit 44 performs an A / D conversion on this output.
Reference numeral 5 denotes an averaging circuit for averaging the A / D conversion output for a long time (10 minutes to 60 minutes). The averaged data is supplied to the first multiplexer 42. As a result, the amount of the electron beam colliding with the fluorescent film of the display tube becomes uniform during the border period and the image period, so that the unburned portion is prevented.
【0018】次に、第2の特徴は時間軸圧縮した信号と
ボーダー信号との境界部分を平滑する点である。即ち、
第1マルチプレキサ42出力を水平方向に平滑する水平
LPF11及び垂直方向に平滑する垂直LPF12を直
列に設けると共に、前記境界部分に相当する約5ドット
期間、LPF切換え信号により切換わる第2マルチプレ
キサ13を設けている。The second feature is that the boundary between the time-compressed signal and the border signal is smoothed. That is,
A horizontal LPF 11 for smoothing the output of the first multiplexer 42 in the horizontal direction and a vertical LPF 12 for smoothing the output in the vertical direction are provided in series. Is provided.
【0019】従って、図2イの如く境界部分を含む5ド
ット期間は第2マルチプレクサ13は垂直LPF12出
力を選択して出力し、それ以外の期間は第1マルチプレ
キサ42出力を水平LPF11及び垂直LPF12で遅
れる時間と同等の遅延量を有する遅延回路14を経由し
た出力を選択して出力する。水平LPF11によって境
界部分の水平方向には波型のエッジが丸くなり、後段の
輪郭補正回路で輪郭が強調されても図2ロの如くピーク
が生じない。また、垂直LPF12によって境界部分の
垂直方向のゆがみも補正される。Accordingly, as shown in FIG. 2A, the second multiplexer 13 selects and outputs the output of the vertical LPF 12 during the 5-dot period including the boundary portion, and outputs the output of the first multiplexer 42 to the horizontal LPF 11 and the vertical LPF 12 during the other periods. To select and output the output via the delay circuit 14 having the same delay amount as the delay time. The horizontal LPF 11 rounds the wavy edge in the horizontal direction of the boundary portion, and no peak occurs as shown in FIG. 2B even if the contour is emphasized by the subsequent contour correction circuit. The vertical LPF 12 also corrects the vertical distortion of the boundary.
【発明の効果】上述の如く本発明によれば、画面上での
ボーダー信号部分と映像信号部分の境界に発生するピー
ク及び境界線のゆがみを解消することができる。As described above, according to the present invention, it is possible to eliminate the distortion of the peak and the boundary generated at the border between the border signal portion and the video signal portion on the screen.
【図1】本発明の一実施例におけるテレビジョン信号変
換装置のブロック図。FIG. 1 is a block diagram of a television signal conversion device according to an embodiment of the present invention.
【図2】図1の要部波形図。FIG. 2 is a waveform diagram of a main part of FIG.
【図3】ワイドアスペクト比を有する表示管の表示例を
示す図。FIG. 3 is a view showing a display example of a display tube having a wide aspect ratio.
【図4】従来のテレビジョン信号変換装置のブロック
図。FIG. 4 is a block diagram of a conventional television signal conversion device.
【図5】図4の要部波形図。FIG. 5 is a waveform diagram of a main part of FIG. 4;
1 倍速変換部 2、3 第1、第2時間軸圧縮部 4 ボーダー信号付加回路 8 輪郭補正回路 11 水平LPF 12 垂直LPF 1 Double-speed converter 2, 3 First and second time axis compressor 4 Border signal addition circuit 8 Contour correction circuit 11 Horizontal LPF 12 Vertical LPF
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平3−113978(JP,A) 特開 昭63−224481(JP,A) 特開 平1−194574(JP,A) 特開 平3−1781(JP,A) (58)調査した分野(Int.Cl.7,DB名) H04N 7/01 H04N 5/445 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-113978 (JP, A) JP-A-63-224481 (JP, A) JP-A-1-194574 (JP, A) JP-A-3-194 1781 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) H04N 7/01 H04N 5/445
Claims (1)
ョン信号を時間軸圧縮する手段と、この時間軸圧縮した
信号に連続する無信号期間に所定輝度レベルを有するボ
ーダー信号を付加するボーダー信号付加手段と、このボ
ーダー信号付加手段出力の輪郭を補正する輪郭補正回路
とを備えるアスペクト比を交換するためのテレビジョン
信号変換装置において、 前記輪郭補正回路の前段に、前記時間軸圧縮した信号と
ボーダー信号との境界部分を平滑する水平ローパスフィ
ルタ及び若しくは垂直ローパスフィルタを備えてなるテ
レビジョン信号変換装置。1. A means for compressing a television signal having a screen aspect ratio of 4: 3 on a time axis, and a border signal for adding a border signal having a predetermined luminance level to a signal-free period continuous to the signal compressed on the time axis. A television signal converter for exchanging aspect ratios, comprising: an addition unit and a contour correction circuit for correcting a contour of an output of the border signal addition unit. A television signal conversion device including a horizontal low-pass filter and / or a vertical low-pass filter for smoothing a boundary portion with a border signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12026591A JP3219424B2 (en) | 1991-05-24 | 1991-05-24 | Television signal converter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12026591A JP3219424B2 (en) | 1991-05-24 | 1991-05-24 | Television signal converter |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04346589A JPH04346589A (en) | 1992-12-02 |
JP3219424B2 true JP3219424B2 (en) | 2001-10-15 |
Family
ID=14781938
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12026591A Expired - Fee Related JP3219424B2 (en) | 1991-05-24 | 1991-05-24 | Television signal converter |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3219424B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113395461A (en) * | 2020-03-12 | 2021-09-14 | 平湖莱顿光学仪器制造有限公司 | Fluorescence-related intelligent two-dimensional video device and two-dimensional video playing method thereof |
-
1991
- 1991-05-24 JP JP12026591A patent/JP3219424B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH04346589A (en) | 1992-12-02 |
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