JPH01200881A - Picture signal transmission system - Google Patents
Picture signal transmission systemInfo
- Publication number
- JPH01200881A JPH01200881A JP63024009A JP2400988A JPH01200881A JP H01200881 A JPH01200881 A JP H01200881A JP 63024009 A JP63024009 A JP 63024009A JP 2400988 A JP2400988 A JP 2400988A JP H01200881 A JPH01200881 A JP H01200881A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- ntsc
- image signal
- aspect ratio
- scanning lines
- Prior art date
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- 230000008054 signal transmission Effects 0.000 title claims description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 35
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
- 230000015654 memory Effects 0.000 description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 230000000750 progressive effect Effects 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、いわゆるハイビジョンなど、アスペクト比、
すなわち、画面の横幅と縦幅との比の大きい横長の画面
に高精細度の画像を表示する広帯域カラー画像信号を狭
帯域伝送する画像信号伝送方式に関し、特に、ＮＴＳＣ
方式カラーテレビジョン信号に対し効率よく両立性を保
って信号形式の変換を行ない得るようにしたちである。[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to so-called high-definition, aspect ratio,
In other words, it relates to an image signal transmission method that narrowband transmits a wideband color image signal that displays a high-definition image on a horizontally long screen with a large ratio of width to height.
This makes it possible to efficiently convert signal formats while maintaining compatibility with standard color television signals.
（発明の概要）
本発明は、アスペクト比の大きく、走査線数の多いハイ
ビジョン信号をＮＴＳＣ方式テレビジョン信号と両立さ
せて狭帯域伝送するために、ＮＴＳＣ方式の走査線のう
ち、ＮＴＳＣ信号とハイビジョン信号とのアスペクト比
の比に相当する本数の走査線でハイビジョン信号の垂直
方向低域信号成分を伝送し、残りの走査線で垂直方向高
域信号成分を伝送し得るように、走査線数変換とサブサ
ンプリング折り返し多重による帯域圧縮とをハイビジョ
ン信号に施して伝送するようにしたものである。(Summary of the Invention) The present invention provides a method for transmitting a high-definition signal with a large aspect ratio and a large number of scanning lines in a narrow band while making it compatible with an NTSC television signal. The number of scanning lines is converted so that the vertical low frequency signal component of the high-definition signal can be transmitted using the number of scanning lines corresponding to the aspect ratio of the signal, and the vertical high frequency signal component can be transmitted using the remaining scanning lines. and band compression by subsampling and multiplexing are applied to the high-definition signal before transmission.
（従来の技術）
従来、ハイビジョン信号などアスペクト比がＮＴＳＣ方
式より大きい広帯域カラー画像信号をＮＴＳＣ方式カラ
ーテレビジョン信号と両立性を保って伝送する場合には
、双方の再生画像の大きさを合わせるために、ハイビジ
ョン画像の左右両端部約１７８ずつを切捨てるか、ＮＴ
ＳＣ画像の上下両端領域１７８ずつを例えば黒レベルな
ど無信号の状態で伝送するように考えられていた。(Prior art) Conventionally, when transmitting a broadband color image signal such as a high-definition signal whose aspect ratio is larger than that of the NTSC system while maintaining compatibility with an NTSC system color television signal, it is necessary to match the size of the reproduced images on both sides. In this case, either cut off approximately 178 parts from both the left and right ends of the high-definition image, or
The idea was to transmit the upper and lower end areas 178 of the SC image in a state where there is no signal, such as the black level.
（発明が解決しようとする課題）
したがって、従来考えられていたハイビジョン信号の両
立性狭帯域伝送には、いずれの場合にも伝送情報量の削
減という問題点があり、特に、再生画面の上下両端部を
無信号伝送にするのは、伝送効率を著しく低下させるこ
とになるので、かかる問題点を除去するのがこの種両立
性伝送に対する課題であった。(Problem to be Solved by the Invention) Therefore, the conventionally considered compatible narrowband transmission of high-definition signals has the problem of reducing the amount of transmitted information in any case. Since transmitting signals without a signal in the transmitter will significantly reduce the transmission efficiency, it has been a challenge for this type of compatible transmission to eliminate this problem.
（課題を解決するための手段）
本発明の目的は、上述した従来の課題を解決し、アスペ
クト比の大きい横長の広角画面に高精細度の画像を表示
する広帯域カラー画像信号を、ＮＴＳＣ方式カラーテレ
ビジョン信号との両立性を保ち、しかも、伝送情報量を
削減することなく、良好な効率で狭帯域伝送し得る画像
信号伝送方式を提供することにある。(Means for Solving the Problems) An object of the present invention is to solve the above-mentioned conventional problems, and to convert a wideband color image signal that displays a high-definition image on a horizontally long wide-angle screen with a large aspect ratio into an NTSC color image signal. An object of the present invention is to provide an image signal transmission method that maintains compatibility with television signals and can perform narrowband transmission with good efficiency without reducing the amount of transmitted information.
すなわち、本発明画像信号伝送方式は、所定の毎秒像数
を有し、アスペクト比が大きく、走査線数が多い広帯域
画像信号を狭帯域伝送するにあたり、前記所定の毎秒像
数を有し、アスペクト比が小さく、走査線数が少ない狭
帯域画像信号と同一本数の走査線のうち、前記狭帯域画
像信号と前記広帯域画像信号とのアスペクト比の比に相
当する本数の走査線により、前記広帯域画像信号の垂直
方向の低域信号成分に走査線数変換およびサブサンプリ
ングを施して狭帯域伝送するとともに、残余の本数の走
査線により、前記広帯域画像信号の垂直方向の高域信号
成分に走査線数変換およびサブサンプリングを施して狭
帯域伝送することにより、前記広帯域画像信号を前記狭
帯域画像信号と両立性を保って狭帯域伝送するようにし
たことを特徴とするものである。That is, the image signal transmission method of the present invention has a predetermined number of images per second, has a large aspect ratio, and transmits a wideband image signal having a large number of scanning lines in a narrow band. Among the same number of scanning lines as the narrowband image signal, which has a small ratio and a small number of scanning lines, the wideband image is generated by a number of scanning lines corresponding to the aspect ratio ratio of the narrowband image signal and the wideband image signal. The vertical low-frequency signal component of the signal is subjected to scanning line number conversion and subsampling for narrowband transmission, and the remaining number of scanning lines is used to convert the vertical high-frequency signal component of the wideband image signal into a scanning line number. The present invention is characterized in that the wideband image signal is transmitted in a narrowband while maintaining compatibility with the narrowband image signal by performing conversion and subsampling for narrowband transmission.
（作 用）
したがって、本発明画像信号伝送方式においては、ハイ
ビジョンなど広帯域カラー画像信号を、ＮＴＳＣ方式カ
ラーテレビジョン信号との両立性を保ち、通常の受像機
による再生画像をあまり劣化させることなく、良好な伝
送効率をもって狭帯域伝送することができる。(Function) Therefore, the image signal transmission system of the present invention maintains compatibility with wideband color image signals such as high-definition television signals and NTSC color television signals, without significantly deteriorating images reproduced by ordinary television receivers. Narrowband transmission can be performed with good transmission efficiency.
（実施例）
以下に図面を参照して実施例につき本発明の詳細な説明
する。(Example) The present invention will be described in detail below with reference to the drawings.
まず、本発明伝送方式における送信側の広帯域カラー画
像信号変換装置の概略構成の例を第１図に示し、その動
作原理を第２図乃至第５図につき順次に説明する。First, FIG. 1 shows an example of a schematic configuration of a broadband color image signal conversion device on the transmitting side in the transmission system of the present invention, and its operating principle will be sequentially explained with reference to FIGS. 2 to 5.
第１図示の構成による画像変換装置においては、例えば
毎秒像数３０、走査線数１１２５、アスペクト比１６：
９、インターレース比２：１のハイビジョン信号を毎秒
像数３０、走査線数５２５、アスペクト比４：３すなわ
ち１６：１２ 、インターレース比２：１のＮＴＳＣ信
号と同じ信号形式に変換するにあたり、第２図に示すよ
うに、ＮＴＳＣ方式走査線のうちＮＴＳＣ信号のアスペ
クト比とハイビジョン信号のアスペクト比との比に相当
する中央部領域（３）の走査線にハイビジョン信号の垂
直方向低域信号成分を割当て、上下両端領域（２）Ｌ
、 （２）ｂに垂直方向高域信号成分を割当ててそれぞ
れ所要の信号変換を施し、ＮＴＳＣ信号との両立性を有
する狭帯域化ハイビジョン信号を中央部領域（３）で伝
送し、ハイビジョン信号の復元再生に必要な高精細度画
像情報信号を上下両端領域（２）で伝送するようにする
。In the image conversion device having the configuration shown in the first figure, for example, the number of images per second is 30, the number of scanning lines is 1125, and the aspect ratio is 16:
9. When converting a high-definition signal with an interlace ratio of 2:1 to the same signal format as an NTSC signal with an interlace ratio of 2:1, with a number of images per second of 30, a number of scanning lines of 525, an aspect ratio of 4:3, or 16:12, and an interlace ratio of 2:1. As shown in the figure, the vertical low-frequency signal component of the high-definition signal is assigned to the central area (3) of the NTSC scan lines, which corresponds to the ratio of the aspect ratio of the NTSC signal to the aspect ratio of the high-definition signal. , upper and lower end areas (2) L
, (2) allocate vertical high-frequency signal components to b and perform the necessary signal conversion on each, transmit a narrowband high-definition signal that is compatible with NTSC signals in the central region (3), and convert the high-definition signal into High-definition image information signals necessary for restoration reproduction are transmitted in both upper and lower end areas (2).
すなわち、上述した信号変換の過程を順次に示す第３図
の過程〔１〕に示すアスペクト比１６：９、走査線数１
１２５の入力ハイビジョン信号をラインコンバータ（Ｌ
Ｃ、、、）１および（ＬＣ−、ｈ ） ２に並列に供
給し、ラインコンバータ（ＬＣ、、Ｌ ） １におい
ては、ハイビジョン信号の輝度信号Ｙと色信号Ｉ。That is, the aspect ratio is 16:9 and the number of scanning lines is 1, as shown in step [1] in FIG. 3, which sequentially shows the signal conversion process described above.
125 input high-definition signals to a line converter (L
C,,,)1 and (LC-,h)2 in parallel, and in the line converter (LC,,L)1, the luminance signal Y and color signal I of the high-definition signal.
Ｑとを走査線毎に時間軸圧縮・時分割多重して直列信号
に変換したうえで、第３図における過程〔２］の上段に
示すように、ハイビジョン信号の有効走査線１０３５本
上の垂直方向低域信号成分をＮＴＳＣ方式有効走査線５
０４本のうらの中央領域（３）に相当する３８０本で狭
帯域伝送し得るように走査線数変換とサブサンプリング
による折り返し多重とを施し、一方、ラインコンバータ
（ＬＣ、、ｈ） ２においては、第３図における過程
〔２〕の下段に示すように、ハイビジョン信号の有効走
査線１０３５本上の垂直方向高域輝度信号Ｙ、をＮＴＳ
Ｃ方式有効走査線５０４木のうちの上下両端領域（２）
に相当する１２４本で狭帯域伝送し得るように走査線変
換とサブサンプリングによる折り返し多重とを施す。つ
いで、ラインコンバータ（ＬＣ、、Ｌ ） １および
（ＬＣｍ、ｈ ）２の変換出力信号をそれぞれラインコ
ンバータ（ＬＣｂ、Ｌ） ３および（ＬＣｂ、ｈ ）
４に供給し、第３図における過程〔３〕の上下両段にそ
れぞれ示すように、ハイビジョン信号の垂直方向低域信
号成分を中央領域（３）の３８０本に載せた走査線数５
２５、アスペクト比１６：１２すなわち４：３のＮＴＳ
Ｃ方式の信号形態に変換するとともに、ハイビジョン信
号の垂直方向高域輝度信号成分を上下両端領域（２）
ｔ。After compressing the time axis and time-division multiplexing Q for each scanning line and converting it into a serial signal, as shown in the upper part of process [2] in Figure 3, the vertical Direction low frequency signal component to NTSC system effective scanning line 5
Scanning line number conversion and folding multiplexing by subsampling were performed to enable narrowband transmission using 380 lines corresponding to the central area (3) at the back of 04 lines.On the other hand, in line converter (LC, h) 2, , as shown in the lower part of process [2] in FIG.
Both upper and lower ends of the C method effective scanning line 504 tree (2)
Scanning line conversion and folding multiplexing using subsampling are performed so that narrowband transmission can be performed using 124 lines corresponding to 124 lines. Next, the conversion output signals of line converters (LC,, L) 1 and (LCm, h) 2 are converted to line converters (LCb, L) 3 and (LCb, h), respectively.
4, and as shown in the upper and lower rows of process [3] in FIG.
25, NTS with aspect ratio 16:12 or 4:3
In addition to converting the signal format of the C system, the vertical high-frequency luminance signal component of the high-definition signal is converted to the upper and lower end regions (2).
t.
（２）ｂの６２本ずつに載せた走査線数５２５、アスペ
クト比４：３のＮＴＳＣ方式の信号形態に変換する。つ
いで、ラインコンバータ（ＬＣｂ、Ｌ ） ３および
（ＬＣｂ、ｈ ）４の変換出力信号をＮＴＳＣエンコー
ダ５に供給し、制御部６の制御のちとに、第３図におけ
る過程〔４〕に示すように、双方の変換出力信号を合成
してＮＴＳＣ信号と同一の複合カラー画像信号形式にし
た狭帯域化ハイビジョン信号を改良ＮＴＳＣ方式カラー
画像信号として取出す。(2) Convert to an NTSC signal format with 525 scanning lines placed on each 62 lines of b and an aspect ratio of 4:3. Next, the converted output signals of the line converters (LCb, L) 3 and (LCb, h) 4 are supplied to the NTSC encoder 5, and after being controlled by the controller 6, the signals are processed as shown in step [4] in FIG. , a narrowband high-definition signal obtained by combining both converted output signals into the same composite color image signal format as the NTSC signal is extracted as an improved NTSC color image signal.
しかして、上述のような信号形態の改良ＮＴＳＣ方式カ
ラー画像信号における上下両端領域（２）の伝送信号は
、通常の受像機によりＮＴＳＣ信号として受信再生した
場合には意味のない情報となるので、再生画面の上下両
端部（２）に表示されるかかる無意味情報がＮＴＳＣ信
号として再生表示した狭帯域化ハイビジョン画像を観視
するのに邪魔にならないように配慮する必要がある。Therefore, the transmission signals in the upper and lower end areas (2) of the improved NTSC color image signal with the above-mentioned signal format become meaningless information when received and reproduced as an NTSC signal by a normal television receiver. Care must be taken so that such meaningless information displayed at both the upper and lower ends (2) of the reproduction screen does not interfere with viewing the narrowband high-definition image reproduced and displayed as an NTSC signal.
第４図に示すＮＴＳＣ方式カラー画像信号の信号波形に
基づき、上述のような配慮を施した本発明伝送方式の狭
帯域化ハイビジョン信号すなわち改良ＮＴＳＣ信号の信
号波形の例を第５図に示す。Based on the signal waveform of the NTSC color image signal shown in FIG. 4, FIG. 5 shows an example of the signal waveform of a narrowband high-definition signal, that is, an improved NTSC signal, of the transmission system of the present invention, which takes the above considerations.
第４図示のＮＴＳＣ方式カラー画像信号波形においては
、黒ペデスタル・レベルをＯνとして映像信号の白ピー
クレベルを＋〇、７Ｖ 、同期信号のピークレベルを−
０，３ｖにそれぞれ設定しであるので、映像信号の許容
レベル範囲は約−０，１５〜＋〇、７シになる。In the NTSC color image signal waveform shown in Fig. 4, the black pedestal level is Oν, the white peak level of the video signal is +〇, 7V, and the peak level of the synchronization signal is -.
Since they are set to 0 and 3V, respectively, the allowable level range of the video signal is about -0.15 to +0.7V.
一方、第５図示の本発明方式改良ＮＴＳＣ方式カラー画
像信号波形においては、区間（１）が垂直ブランキング
期間の信号波形を示し、区間（２）が第２図示のＮＴＳ
Ｃ画像における上下両端領域（２）の垂直方向高域輝度
信号成分の信号波形を示し、区間（３）が第２図示のＮ
ＴＳＣ画像における中央領域（３）の垂直方向低域カラ
ー画像信号成分の信号波形を示している。On the other hand, in the improved NTSC color image signal waveform according to the present invention shown in FIG.
The signal waveform of the vertical high-frequency luminance signal component in the upper and lower end regions (2) of the C image is shown, and the section (3) is the N shown in the second figure.
The signal waveform of the vertical low-pass color image signal component in the central region (3) in the TSC image is shown.
しかして、区間（３）の信号波形は第４図示のＮＴＳＣ
方式カラー画像信号波形とほぼ同一であるが、区間（２
）の信号波形においては、カラーバースト信号を重畳す
る環ペデスタルレベルを例えば＋０．４ｖ程度に設定し
て、改良ＮＴＳＣ信号の再生表示には無関係の垂直方向
高域輝度信号成分波形を黒ペデスタルレベル以下に設定
し、狭帯域化ハイビジョン画像の観視を邪魔しないよう
にしである。Therefore, the signal waveform in section (3) is NTSC as shown in Figure 4.
It is almost the same as the color image signal waveform, but the interval (2
), the ring pedestal level on which the color burst signal is superimposed is set to, for example, about +0.4V, and the vertical high-frequency luminance signal component waveform, which is unrelated to the reproduction display of the improved NTSC signal, is lower than the black pedestal level. This is done so as not to interfere with the viewing of narrow-band high-definition images.
一方、本発明伝送方式において第１図示の構成により送
信側で形成した上述の狭帯域化ハイビジョン信号を高精
細度の広帯域カラー画像信号に復元して再生するように
した受信側のカラー画像信号変換装置の概略構成の例を
第６図に示す。On the other hand, in the transmission system of the present invention, color image signal conversion is performed on the receiving side so that the above-mentioned narrowband high-definition signal formed on the transmitting side is restored and reproduced into a high-definition wideband color image signal using the configuration shown in the first diagram. An example of a schematic configuration of the device is shown in FIG.
第６図示の構成によるカラー画像変換装置においては、
走査線数５２５、アスペクト４：３、インターレース比
２：１の改良ＮＴＳＣ信号をＮＴＳＣデコーダ７に供給
し、制御部８の制御のもとに、第３図における過程〔３
〕の上段に示した構成配置の色信号１．Ｑおよび垂直方
向低域輝度信号成分Ｙ。In the color image conversion device having the configuration shown in FIG.
An improved NTSC signal with a scanning line count of 525, an aspect ratio of 4:3, and an interlace ratio of 2:1 is supplied to the NTSC decoder 7, and under the control of the controller 8, the process shown in FIG.
] Color signal 1 with the configuration shown in the upper row. Q and vertical low band luminance signal component Y.
と下段に示した構成配置の垂直方向高域輝度信号成分Ｙ
ｈとを取出し、それぞれラインコンバータ（ＬＣｃ、ｅ
） ９および（ＬＣｃ、ｔ ） １０と（ＬＣｃ、ｈ
） １１とに供給して、それぞれ、走査線数５２５、
アスペクト比１６：９、インターレース比２：ｌの信号
形式となるように走査線数変換を施す。ついで、ライン
コンバータ（ＬＣｃ、ｃ）９からの色信号１．Ｑをライ
ンコンバータ（ＬＣ、、ｃ）１３に供給するとともに、
ラインコンバータ（ＬＣｃ、Ｌ ）１０および（ＬＣｃ
、ｈ ）１１からの垂直方向低域輝度信号成分Ｙ、およ
び垂直方向高域輝度信号成分Ｙｔ、を加算器１２により
相互に加算合成したうえでラインコンバータ（ｔ、Ｃ、
ｔ、、 ）１４に供給して、それぞれ、走査線数１１２
５、アスペクト比１６：９、インターレース比２：１の
信号形式になるように走査線数変換とりサンプルに引続
く内挿フィルタによる内挿補間とを施し、ノ１イビジョ
ン信号すなわち高精細度の広帯域カラー画像信号を復元
再生する。and the vertical high-frequency luminance signal component Y of the configuration shown in the lower row.
h and line converters (LCc, e
) 9 and (LCc, t ) 10 and (LCc, h
) 11 and 525 scanning lines, respectively.
The number of scanning lines is converted so that the signal format has an aspect ratio of 16:9 and an interlace ratio of 2:1. Next, the color signal 1. from the line converter (LCc, c) 9 is output. While supplying Q to the line converter (LC, , c) 13,
Line converter (LCc, L) 10 and (LCc
.
t, , ) 14, each with 112 scanning lines.
5. Perform interpolation using an interpolation filter following the scanning line number conversion and sample to obtain a signal format with an aspect ratio of 16:9 and an interlace ratio of 2:1. Restore and reproduce broadband color image signals.
なお、前述したように本発明伝送方式による改良ＮＴＳ
Ｃ信号を通常の受像機で受像した場合に再生画面の上下
両端領域（２）の垂直方向高域輝度信号成分が再生画像
観視の邪魔にならないようにするために、その信号レベ
ルをカラーバースト信号を重畳する黒ペデスタルレヘル
以下に設定して、ブランキング期間にその黒ペデスタル
レベルをＤＣクランプする一般の受像機の再生画面には
現われないようするが、ソフトクランプしか行なわない
場合でも、カラーバースト信号を重畳する黒ペデスタル
レヘルＳｖを、第５図示とは異なり、区間（２）におい
ても、Ｏｖに設定すれば、伝送信号のダイナミ・ツクレ
ンジは狭くなるが、通常の再生画像の観視の邪魔にはな
らなくなる。In addition, as mentioned above, the improved NTS using the transmission method of the present invention
In order to prevent the vertical high-frequency luminance signal components in the upper and lower end areas (2) of the playback screen from interfering with viewing the playback image when the C signal is received by a normal TV receiver, the signal level is changed to color burst. It is set below the black pedestal level on which the signal is superimposed, and the black pedestal level is DC-clamped during the blanking period so that it does not appear on the playback screen of a general receiver, but even if only soft clamping is performed, color burst If the black pedestal level Sv on which the signal is superimposed is set to Ov even in section (2), unlike the example shown in Figure 5, the dynamic range of the transmitted signal will be narrowed, but it will not interfere with normal viewing of the reproduced image. It will no longer be.
かかる場合における本発明方式の伝送信号波形は第５図
示の信号波形と区間（１）および（３）では同一である
が、区間（２）では、第７図に示すように、通常のＮＴ
ＳＣ信号波形と同様になり、良好な両立性が得られる。In such a case, the transmission signal waveform of the present invention method is the same as the signal waveform shown in FIG. 5 in sections (1) and (3), but in section (2), as shown in FIG.
The waveform is similar to that of the SC signal, and good compatibility can be obtained.
第７図示の信号波形においては、垂直方向高域輝度信号
成分を例えば振幅約０．３ｖのＦＭ波とし、カラーバー
スト信号とほぼ同一の信号形式にしてＯｖの黒ペデスタ
ルレベルに重畳する。In the signal waveform shown in FIG. 7, the vertical high-range luminance signal component is, for example, an FM wave with an amplitude of about 0.3 V, and is superimposed on the black pedestal level of Ov in a signal format almost the same as that of the color burst signal.
上述のように垂直方向高域輝度信号成分をＦＭ１ｇ］２
送信号の形態で伝送する場合における副搬送波周波数ｆ
０とＦＭＩＩＩ送信号の周波数帯域Ｂとの関係を表わし
たスペクトラムを第８図に示す。なお、かかる場合にお
ける第６図示の受信側画像信号変換装置は、ＮＴＳＣデ
コーダ７にＦＭ復調回路を備えているものとする。また
、かかる場合における通常の受像機の再生画面には上下
両端領域にドツトパターンが現われることになるが、視
覚上あまり邪魔にならない。さらに、副搬送波周波数ｆ
０は、色副搬送波周波数と同様に、上述のドツトパター
ンが画面上の固定パターンとならないように選定する必
要がある。As mentioned above, the vertical high-frequency luminance signal component is converted to FM1g]2
Subcarrier frequency f when transmitting in the form of a transmission signal
FIG. 8 shows a spectrum representing the relationship between frequency band B of the FMIII transmission signal and frequency band B of the FMIII transmission signal. In this case, the receiving side image signal conversion device shown in FIG. 6 is assumed to include an FM demodulation circuit in the NTSC decoder 7. Furthermore, in such a case, a dot pattern will appear on both the upper and lower end areas on the playback screen of a normal television receiver, but it will not be a visual hindrance. Furthermore, the subcarrier frequency f
0, like the color subcarrier frequency, must be selected so that the above-mentioned dot pattern does not become a fixed pattern on the screen.
なお、以上の説明においては、走査線数１１２５本のハ
イビジョン信号と走査線数５２５本のＮＴＳＣ信号との
相互間における両立性信号変換の例について述べたが、
本発明画像信号伝送方式における両立性信号変換は、こ
の例に限られるものではなく、また、上述の例において
も、再生画面上下両端領域（２）におけるカラーバース
ト信号重畳レベルＳｖ、および重畳映像信号レベルすな
わちＦＭＩＩｉｌ送信号レヘルおよしセントアップレベ
ル、あるいは、副搬送波周波数ｆ。および信号帯域幅Ｂ
等は前述した値に固定されるものではない。さらに、そ
の再生画面上下両端領域（２）に伝送する情報信号も、
垂直高域輝度信号に限るものではなく、例えば高域色信
号成分など、ＮＴＳＣ信号帯域では通例伝送されない任
意の高精細度情報信号とすることができる。In the above explanation, an example of compatible signal conversion between a high-definition signal with 1125 scanning lines and an NTSC signal with 525 scanning lines has been described.
The compatibility signal conversion in the image signal transmission system of the present invention is not limited to this example, and also in the above example, the color burst signal superimposition level Sv in the upper and lower end areas (2) of the playback screen and the superimposed video signal level or FMIIil transmission signal level and center up level or subcarrier frequency f. and signal bandwidth B
etc. are not fixed to the values mentioned above. Furthermore, the information signals transmitted to the upper and lower end areas (2) of the playback screen are also
The signal is not limited to a vertical high-band luminance signal, but may be any high-definition information signal that is not normally transmitted in the NTSC signal band, such as a high-band color signal component.
また、本発明伝送方式におけるラインコンバータでは、
毎秒フィールド数が同一であれば、上述したインターレ
ース画像相互間のみならず、インターレース画像と順次
走査画像との相互間、あるいは、順次走査画像の相互間
における走査線数変換も同様にして行なうことができる
。Furthermore, in the line converter in the transmission system of the present invention,
If the number of fields per second is the same, the number of scanning lines can be converted in the same way not only between interlaced images as described above, but also between interlaced images and progressive scanning images, or between progressive scanning images. can.
なお、かかる走査線数変換を行なうラインコンバータに
おいては、走査線数変換に伴う垂直方向の信号特性変換
処理−切を行なうとともに、走査線数変換に伴う走査線
上の前述した時間軸圧縮・時分割多重など水平方向の信
号特性変換処理も併せて行なうものとする。そのうち、
垂直方向信号処理としての走査線数変換は、本発明者ら
の提案に係る特開昭６０−６６５８２号公報記載の「走
査線数変換方式」のとおり１．第９図に示すように、直
列に接続したフィールドメモリ１５−１および１５−２
の入出力端から得た２フイ一ルド期間距てた入力画像信
号の加算器１６における和の１７２係数器１７による平
均を奇数フィールド画像信号として縦続接続したライン
メモリ１８ｚ−１〜１８．に供給するとともに、フィー
ルドメモリ１５−１．１５−２の直列接続の中点からの
１フイールド距てた入力画像信号を偶数フィールド画像
信号として縦続接続したラインメモリ１８□ｎ−２〜１
８゜に供給し、かかる縦続接続ラインメモリからの順次
のライン周期遅延画像信号Ｘ ２ｎ。１〜Ｘｏを係数・
加算器１９−１〜１９−ｍに並列に供し、それぞれ係数
を乗じて重み付けを施したうえで相互に加算した順次の
出力信号を、原理的には切換器２０により切換え、実際
には第１０図に示すように各係数器２１−１．２１−ｍ
により適切に重み付けを施して加算器２２により加算し
て変換出力画像信号Ｙ。In addition, in a line converter that performs such scanning line number conversion, the vertical signal characteristic conversion processing accompanying the scanning line number conversion is performed, and the above-mentioned time axis compression and time division on the scanning line accompanying the scanning line number conversion are performed. Horizontal signal characteristic conversion processing such as multiplexing is also performed. One of these days,
Scanning line number conversion as vertical direction signal processing is performed as described in 1. "Scanning line number conversion method" proposed by the present inventors in Japanese Patent Application Laid-Open No. 60-66582. As shown in FIG. 9, field memories 15-1 and 15-2 are connected in series.
The average of the sum of the input image signals separated by two field periods obtained from the input/output terminals of the adder 16 by the 172 coefficient multiplier 17 is used as an odd field image signal in the cascade-connected line memories 18z-1 to 18. Line memories 18□n-2 to 1 in which input image signals separated by one field from the midpoint of the series connection of field memories 15-1 and 15-2 are connected in cascade as even field image signals.
8° and successive line period delayed image signals X 2n from such cascaded line memories. 1~Xo as coefficient・
In principle, the sequential output signals which are provided in parallel to the adders 19-1 to 19-m, multiplied by coefficients, weighted, and mutually added are switched by the switch 20, and in reality, the 10th As shown in the figure, each coefficient unit 21-1.21-m
The converted output image signal Y is weighted appropriately and added by the adder 22.
を形成するように構成した走査線数変換装置によって行
なう。This is performed by a scanning line number conversion device configured to form a scanning line number converter.
かかる構成の走査線数変換装置は、その動作原理として
は、入力画像信号に走査線の補間を施して一旦入出力走
査線数の最小公倍数の走査線を有する順次走査画像信号
に変換したうえで走査線の間引きを施して出力画像信号
を得る走査線数変換過程における上述の補間および間引
きを一挙に実現し得るように、＠１続接続するラインメ
モリの段数および各係数器の重み付は係数を適切に設定
することにより、任意所望の入出力画像信号間の走査線
数変換を可能にするとともに、所要の垂直方向信号特性
変換、すなわち、たとえば本発明伝送方式における垂直
方向の低域信号成分と高域信号成分との分離抽出などを
行なう。The operating principle of the scanning line number conversion device having such a configuration is that the input image signal is first converted into a progressive scanning image signal having scanning lines that are the least common multiple of the number of input and output scanning lines by interpolating the scanning lines. In order to achieve the above-mentioned interpolation and thinning all at once in the process of converting the number of scanning lines to obtain an output image signal by thinning out the scanning lines, the number of stages of line memories connected in series and the weighting of each coefficient unit are determined by the coefficients. By appropriately setting , it is possible to convert the number of scanning lines between any desired input and output image signals, and also to convert the required vertical signal characteristics, that is, for example, to convert the vertical low frequency signal component in the transmission method of the present invention. and high-frequency signal components.
一方、走査線係数変換に伴う走査線上水平方向の信号特
性変換処理としては、周知慣用の構成により、前述した
時間軸圧縮、時分割多重などの他に、例えば本発明者ら
の提案に係る昭和６３年１月２９日付特許出願明細書記
載の「帯域圧縮伝送方式」のとおり、第１１図（ａ）に
示すスペクトラムのＮＴＳ（Ｊ度信号と同図（ｂ）に示
すスペクトラムのハイビジョン輝度信号との間における
画像信号変換に際して広帯域のハイビジョン輝度信号に
サブサンプリングによる折り返し多重を施して同図（Ｃ
）に示す信号形態に帯域圧縮し、あるいは、補間フィル
タを用いて復元再生するなどの信号特性変換を行なうも
のとする。On the other hand, as signal characteristic conversion processing in the horizontal direction on a scanning line accompanying scanning line coefficient conversion, in addition to the above-mentioned time axis compression and time division multiplexing, for example, the Showa era proposed by the present inventors According to the "band compression transmission system" described in the patent application specification dated January 29, 1963, the NTS (J degree signal) with the spectrum shown in Figure 11 (a) and the high-definition luminance signal with the spectrum shown in Figure 11 (b) During the image signal conversion between
), or perform signal characteristic conversion such as band compression into the signal format shown in ) or restoration and reproduction using an interpolation filter.
（発明の効果）
以上の説明から明らかなように、本発明によれば、ハイ
ビジョン信号などの広角画像信号をＮＴＳＣ信号との両
立性を保って狭帯域伝送する場合に従来生じていた伝送
効率の低下を変換出力ＮＴＳＣ再生画面に生ずる上下両
端の空白領域に、広帯域広角画像の復元再生に必要な高
精細度情報信号をＮＴＳＣ再生画像の観視を妨げること
なく伝送することによって回避するとともに、高精細度
の広角画像を再生表示し得る、という格別の効果が得ら
れる。(Effects of the Invention) As is clear from the above description, according to the present invention, the transmission efficiency that conventionally occurred when transmitting a wide-angle image signal such as a high-definition signal in a narrow band while maintaining compatibility with an NTSC signal can be improved. This problem can be avoided by transmitting high-definition information signals necessary for restoring and reproducing wideband wide-angle images to the blank areas at both the top and bottom ends of the converted output NTSC playback screen without interfering with the viewing of the NTSC playback image. The special effect of being able to reproduce and display high-definition wide-angle images can be obtained.
第１図は本発明伝送方式における送信側画像信号変換装
置の構成例を示すブロック線図、第２図は本発明伝送方
式における変換画面の構成例を示す線図、
第３図は本発明伝送方式における画像信号変換過程を順
次に示す線図、
第４図はＮＴＳＣ方式カラー画像信号波形を示す波形図
、
第５図は本発明による改良ＮＴＳＣ方式カラー画像信号
波形の例を示す波形図、
第６図は本発明伝送方式における受信側画像信号変換装
置の構成例を示すブロック線図、第７図は本発明による
改良ＮＴＳＣ方式カラー画像信号波形の他の例を示す波
形図、
第８図は同じ（その改良ＮＴＳＣ方式カラー画像信号の
例を示すスペクトル線図、
第９図は走査線数変換装置の構成を示すブロック線図、
第１０図は同じ（その走査線数変換装置における切換器
の構成を示すブロック線図、
第１１図（ａ）〜（Ｃ）は折り返し多重帯域圧縮の原理
を順次に示すスペクトル線図である。
１〜４．９〜１１，１３．１４・・・ラインコンバータ
５・・・ＮＴＳＣエンコーダ ６．８・・・制御部７
・・・ＮＴＳＣデコーダ １２．１６．２２・・・
加算器１５−Ｌ １５−２・・・フィールドメモリ１７
．２１−１〜２１−ｍ・・・係数器１８、〜１８□ゎ、
、・・・ラインメモリ１９−１〜１９−ｍ・・・係数・
加算器２０・・・切換器
同 弁理士 杉 村 興
第１図
□」Ｅイ古づア弓画イｌイ吾号・；ε゛、１“（藪Ｊｇ
ｉ＃χ例Ｌ１６二
第７図
ｔｖ Ｎｗ−ｒｓｃイ呂号；、受Ｑｎイせ５ハイ９＋Ｊ
第Ｓ図
改良ＮＴＳＣ布号めスべ舛うＡ
第９図
定Ｉえた蜆字史￥オ突ボｈ買の主」へ゛第１０図
切捩咎め精成
第１１図Fig. 1 is a block diagram showing a configuration example of a transmitting side image signal conversion device in the transmission system of the present invention, Fig. 2 is a diagram showing a configuration example of a conversion screen in the transmission system of the present invention, and Fig. 3 is a diagram showing a configuration example of a transmission side image signal conversion device in the transmission system of the present invention. 4 is a waveform diagram showing an NTSC color image signal waveform; FIG. 5 is a waveform diagram showing an example of an improved NTSC color image signal waveform according to the present invention; FIG. 6 is a block diagram showing a configuration example of a receiving side image signal conversion device in the transmission system of the present invention, FIG. 7 is a waveform diagram showing another example of the improved NTSC system color image signal waveform according to the present invention, and FIG. Same (spectral diagram showing an example of the improved NTSC color image signal, Figure 9 is a block diagram showing the configuration of the scanning line number converter, Figure 10 is the same (spectral diagram showing an example of the improved NTSC color image signal), A block diagram showing the configuration, and FIGS. 11(a) to (C) are spectral diagrams sequentially showing the principle of folded multiband compression. 1 to 4.9 to 11, 13.14...Line converter 5...NTSC encoder 6.8...Control unit 7
...NTSC decoder 12.16.22...
Adder 15-L 15-2...Field memory 17
．． 21-1 to 21-m...Coefficient unit 18, to 18□ゎ,
,... Line memory 19-1 to 19-m... Coefficient.
Adder 20...switcher same Patent attorney Oki Sugimura Figure 1
i#χExample L162 7th figure tv Nw-rsc iro issue;
Figure S: Improved NTSC code number, all over again.
Claims (1)
査線数が多い広帯域画像信号を狭帯域伝送するにあたり
、前記所定の毎秒像数を有し、アスペクト比が小さく、
走査線数が少ない狭帯域画像信号と同一本数の走査線の
うち、前記狭帯域画像信号と前記広帯域画像信号とのア
スペクト比の比に相当する本数の走査線により、前記広
帯域画像信号の垂直方向の低域信号成分に走査線数変換
およびサブサンプリングを施して狭帯域伝送するととも
に、残余の本数の走査線により、前記広帯域画像信号の
垂直方向の高域信号成分に走査線数変換およびサブサン
プリングを施して狭帯域伝送することにより、前記広帯
域画像信号を前記狭帯域画像信号と両立性を保って狭帯
域伝送するようにしたことを特徴とする画像信号伝送方
式。1. In narrowband transmission of a wideband image signal having a predetermined number of images per second, a large aspect ratio, and a large number of scanning lines, having the predetermined number of images per second and a small aspect ratio,
Among the same number of scanning lines as the narrowband image signal with a small number of scanning lines, the number of scanning lines corresponding to the aspect ratio of the narrowband image signal and the wideband image signal is used to control the vertical direction of the wideband image signal. The low frequency signal component of the wideband image signal is subjected to scanning line number conversion and subsampling for narrowband transmission, and the remaining number of scanning lines is used to perform scanning line number conversion and subsampling to the vertical high frequency signal component of the wideband image signal. An image signal transmission system characterized in that the wideband image signal is transmitted in a narrow band while maintaining compatibility with the narrowband image signal by performing narrowband transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024009A JP2594596B2 (en) | 1988-02-05 | 1988-02-05 | Image signal transmission method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63024009A JP2594596B2 (en) | 1988-02-05 | 1988-02-05 | Image signal transmission method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01200881A true JPH01200881A (en) | 1989-08-14 |
| JP2594596B2 JP2594596B2 (en) | 1997-03-26 |
Family
ID=12126552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63024009A Expired - Fee Related JP2594596B2 (en) | 1988-02-05 | 1988-02-05 | Image signal transmission method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2594596B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0292184A (en) * | 1988-09-29 | 1990-03-30 | Pioneer Electron Corp | Muse-ntsc converting system |
| US5084765A (en) * | 1988-09-30 | 1992-01-28 | Tokyo Broadcasting System Inc. | Aspect ratio-improved television system compatible with conventional systems |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6132682A (en) * | 1984-07-25 | 1986-02-15 | Hitachi Ltd | Tv signal processing device |
| JPS6284685A (en) * | 1985-10-09 | 1987-04-18 | Matsushita Electric Ind Co Ltd | Television signal synthesizer |
-
1988
- 1988-02-05 JP JP63024009A patent/JP2594596B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6132682A (en) * | 1984-07-25 | 1986-02-15 | Hitachi Ltd | Tv signal processing device |
| JPS6284685A (en) * | 1985-10-09 | 1987-04-18 | Matsushita Electric Ind Co Ltd | Television signal synthesizer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0292184A (en) * | 1988-09-29 | 1990-03-30 | Pioneer Electron Corp | Muse-ntsc converting system |
| US5084765A (en) * | 1988-09-30 | 1992-01-28 | Tokyo Broadcasting System Inc. | Aspect ratio-improved television system compatible with conventional systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2594596B2 (en) | 1997-03-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |