JP2594596B2 - Image signal transmission method - Google Patents
Image signal transmission methodInfo
- Publication number
- JP2594596B2 JP2594596B2 JP63024009A JP2400988A JP2594596B2 JP 2594596 B2 JP2594596 B2 JP 2594596B2 JP 63024009 A JP63024009 A JP 63024009A JP 2400988 A JP2400988 A JP 2400988A JP 2594596 B2 JP2594596 B2 JP 2594596B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- image signal
- scanning lines
- ntsc
- conversion
- 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.)
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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ものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention displays a high-definition image on a horizontally long screen having a large aspect ratio, that is, a ratio of the width to the height of the screen, such as a so-called Hi-Vision. Image signal transmission system for narrowband transmission of wideband color image signals, especially NTSC
It is possible to convert the signal format of the system color television signal while maintaining the compatibility efficiently.
（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、NT
SC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 high-vision signal having a large aspect ratio and a large number of scanning lines to be transmitted in a narrow band while being compatible with an NTSC television signal.
The number of scanning lines corresponding to the ratio of the aspect ratio between the SC signal and the high-definition signal transmits the low-frequency signal component in the vertical direction of the high-definition signal, and the remaining scanning lines transmit the high-frequency signal component in the vertical direction. The conversion of the number of scanning lines and the band compression by sub-sampling loop multiplexing are performed on the Hi-Vision signal and transmitted.
（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1/8ずつを切捨てるか、NTSC画像の上
下両端部約1/8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 wideband color image signal such as a Hi-Vision signal having an aspect ratio larger than that of the NTSC system while maintaining compatibility with the NTSC system color television signal, it is necessary to match the size of both reproduced images. In addition, it has been considered that about 1/8 of each of the left and right ends of the HDTV image is truncated, or about 1/8 of each of the upper and lower ends of the NTSC image is transmitted without a signal such as a 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。(Problems to be Solved by the Invention) Therefore, the conventionally considered compatible narrowband transmission of Hi-Vision signals has a problem of reducing the amount of transmission information in any case. Since the signal-less transmission of the unit significantly reduces the transmission efficiency, it has been a problem for this type of compatible transmission to eliminate such a 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 conventional problems described above and to convert a wide-band color image signal for displaying a high-definition image on a horizontally wide screen with a large aspect ratio into an NTSC color image signal. It is an object of the present invention to provide an image signal transmission system which can maintain narrow band transmission with good efficiency without reducing the amount of transmission information while maintaining compatibility with television signals.
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, a large aspect ratio, and a narrow band transmission of a wideband image signal having a large number of scanning lines. Among the same number of scanning lines as the narrow band image signal having a small ratio of the number of scanning lines, the number of scanning lines corresponding to the ratio of the aspect ratio between the narrow band image signal and the wide band image signal causes the wide band image to be displayed. The low-frequency signal component in the vertical direction of the signal is subjected to narrow-band transmission by performing conversion and subsampling on the number of scanning lines, and the number of scanning lines is reduced to the high-frequency signal component in the vertical direction of the wideband image signal by the remaining number of scanning lines. By performing narrowband transmission by performing conversion and subsampling, the wideband image signal is narrowband transmitted while maintaining compatibility with the narrowband image signal. It is intended.
（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。(Operation) Therefore, in the image signal transmission method of the present invention, a wideband color image signal such as a high-definition television signal is kept compatible with an NTSC color television signal, and a reproduced image by a normal receiver is not deteriorated so much. Narrow band 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を詳細に説
明する。(Example) Hereinafter, the present invention will be described in detail with reference to the drawings with reference to examples.
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 wideband color image signal conversion device on the transmission side in the transmission system of the present invention, and the operation principle will be sequentially described with reference to FIGS.
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）t,（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 apparatus having the configuration shown in FIG. 1, for example, a high-vision signal having 30 images per second, 1125 scanning lines, an aspect ratio of 16: 9, and an interlace ratio of 2: 1 is converted into 30 images per second, 525 scanning lines, and an aspect ratio. In converting to the same signal format as the NTSC signal of 4: 3, that is, 16:12, and the interlace ratio of 2: 1, as shown in FIG.
The vertical low-pass signal component of the Hi-Vision signal is assigned to the scanning line in the central area (3) corresponding to the ratio between the signal aspect ratio and the aspect ratio of the Hi-Vision signal, and both upper and lower end areas (2) t , (2) b To the high-frequency signal component in the vertical direction, perform the required signal conversion, transmit the narrowband Hi-Vision signal compatible with the NTSC signal in the central area (3), and reproduce the high-frequency signal necessary for the reproduction and reproduction of the Hi-Vision signal. The definition image information signal is transmitted in the upper and lower end regions (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1125
の入力ハイビジョン信号をラインコンバータ（LCa.L）
１および（LCa.h）２に並列に供給し、ラインコンバー
タ（LCa.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,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504本のうちの中央領域（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
（LCa.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YhをNTSC方式有効走査線50
4本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
（LCa.L）１および（LCa.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525、アスペ
クト比16:12すなわち4:3のNTSC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,（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の制御のもとに、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NT
SC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。That is, the third signal sequentially showing the above-mentioned signal conversion process.
Aspect ratio 16: 9 and number of scanning lines 1125 shown in process [1] of the figure.
Input HDTV signal to line converter (LC aL )
1 and (LC ah ) 2 in parallel, and in a line converter (LC aL ) 1, the luminance signal Y and the color signals I and Q of the HDTV signal are time-axis-compressed and time-division multiplexed for each scanning line. After converting the signal into a serial signal, as shown in the upper part of the process [2] in FIG. 3, the vertical low-frequency signal component on the 1035 effective scanning lines of the Hi-Vision signal is extracted from the 504 effective scanning lines of the NTSC system. Conversion of the number of scanning lines and folding multiplexing by sub-sampling are performed so that narrow band transmission can be performed with 380 lines corresponding to the central area (3), while the line converter (LC ah ) 2 performs the process in FIG. 2] As shown in the lower part, the effective scanning line 1035 of the HDTV signal
NTSC system effective scanning lines 50 a vertical high-frequency luminance signal Y h of Hon'ue
Scan line conversion and return multiplexing by sub-sampling are performed so that narrow band transmission can be performed with 124 lines corresponding to the upper and lower end regions (2) of the four lines. Next, the converted output signals of the line converters (LC aL ) 1 and (LC ah ) 2 are supplied to the line converters (LC bL ) 3 and (LC bh ) 4, respectively, and both upper and lower stages of the process [3] in FIG. As shown in FIG. 3, the vertical low-frequency signal component of the Hi-Vision signal is converted into an NTSC signal form having 525 scanning lines and an aspect ratio of 16:12, ie, 4: 3, mounted on 380 lines in the central area (3). At the same time, the vertical high-luminance signal component of the Hi-Vision signal is converted to an NTSC signal format with 525 scanning lines and an aspect ratio of 4: 3 on 62 upper and lower end regions (2) t and (2) b. I do. Next, the converted output signals of the line converters (LC bL ) 3 and (LC bh ) 4 are supplied to the NTSC encoder 5, and under the control of the control unit 6, as shown in the process [4] in FIG. Combine both converted output signals to NT
A narrowband HDTV signal in the same composite color image signal format as the SC 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。Thus, the transmission signals in the upper and lower end regions (2) in the improved NTSC color image signal having the above-described signal form are:
Since the information becomes meaningless when it is received and reproduced as an NTSC signal by a normal receiver, such meaningless information displayed at the upper and lower ends (2) of the reproduction screen is reproduced and displayed as an NTSC signal. Care must be taken not to disturb the viewing of the image.
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。FIG. 5 shows an example of a signal waveform of a narrowband Hi-Vision signal of the transmission system of the present invention, that is, an improved NTSC signal, in which the above-mentioned consideration is given based on the signal waveform of the NTSC color image signal shown in FIG.
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OVとして映像信号の白ピークレ
ベルを＋0.7V、同期信号のピークレベルを−0.3Vにそれ
ぞれ設定してあるので、映像信号の許容レベル範囲は約
−0.15〜＋0.7Vになる。In the NTSC color image signal waveform shown in FIG.
The black pedestal level is set to OV, the white peak level of the video signal is set to +0.7 V, and the peak level of the sync signal is set to -0.3 V. Therefore, the allowable level range of the video signal is about -0.15 to +0.7 V. Become.
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NTSC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NTSC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。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黒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てある。On the other hand, in the color image signal waveform of the improved NTSC system of the present invention shown in FIG. 5, the section (1) shows the signal waveform in the vertical blanking period, and the section (2) shows the upper and lower end regions ( 2) shows the signal waveform of the vertical high-frequency luminance signal component, and section (3) shows the signal waveform of the vertical low-frequency color image signal component in the central area (3) in the NTSC image shown in FIG. Thus, the signal waveform in the section (3) is substantially the same as the NTSC color image signal waveform shown in FIG. 4, but in the signal waveform in the section (2), the black pedestal level on which the color burst signal is superimposed is, for example, +0. It is set to about .4V, and the vertical high-frequency luminance signal component waveform unrelated to the playback display of the improved NTSC signal is set below the black pedestal level so as not to disturb the viewing of the narrowband HDTV image. .
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, a color image signal conversion on the receiving side is performed such that the above-described narrowed-band Hi-Vision signal formed on the transmitting side by the configuration shown in FIG. FIG. 6 shows an example of a schematic configuration of the apparatus.
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I,Qおよび垂直方向低域輝度信号
成分YLと下段に示した構成配置の垂直方向高域輝度信号
成分Yhとを取出し、それぞれラインコンバータ（L
CC.c）９および（LCC.L）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2:1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I,Qをラインコンバータ（LCd.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YLおよび垂直方向高
域輝度信号成分Yh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（LCd.y）14に供給して、それ
ぞれ、走査線数1125、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リサン
プルに引続く内挿フィルタによる内挿補間とを施し、ハ
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。In the color image converter having the configuration shown in FIG. 6, the number of scanning lines is 525, the aspect ratio is 4: 3, and the interlace ratio is 2:
The improved NTSC signal of (1) is supplied to the NTSC decoder 7 and the control unit 8
Under the control of the vertical high-pass configuration arrangement shown chrominance signal I of the configuration arrangement shown in the upper stage, Q and vertically low-frequency luminance signal component Y L and the lower step (3) in Figure 3 taken out a luminance signal component Y h, respectively line converter (L
C Cc ) 9, (LC CL ) 10 and (LC Ch ) 11, and the number of scanning lines is set to 525, the aspect ratio 16: 9, and the interlace ratio 2: 1. Perform the conversion. Next, the color signals I and Q from the line converter (LC Cc ) 9 are supplied to the line converter (LC dc ) 13, and the line converters (LC cL ) 10 and (LC ch )
The vertical low-frequency luminance signal component Y L and the vertical high-frequency luminance signal component Y h from 11 are added and synthesized by an adder 12 and then supplied to a line converter (LC dy ) 14, each of which has a scanning line. High-definition signals, that is, high-definition wideband, by converting the number of scanning lines and interpolating by an interpolation filter following resampling so that the signal format is 1125, the aspect ratio is 16: 9, and the interlace ratio is 2: 1. The color image signal is restored and reproduced.
なお、前述したように本発明伝送方式による改良NTSC
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ベル以
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ベ
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ックレンジは狭く
なるが、通常の再生画像の観視の邪魔にはならなくな
る。As described above, the improved NTSC according to the transmission method of the present invention
When the signal is received by a normal receiver, the signal level of the signal is changed to a color burst signal so that the vertical high-frequency luminance signal components in the upper and lower ends (2) of the reproduction screen do not disturb the viewing of the reproduction image. The black pedestal level is set to be less than the black pedestal level to be superimposed so that the black pedestal level does not appear on the playback screen of a general receiver that DC-clamps the black pedestal level during the blanking period. Is superimposed on the black pedestal level SV, which is different from that shown in FIG.
When set to OV, the dynamic range of the transmission signal is narrowed, but does not hinder the viewing of a normal reproduced image.
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。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 such a case, the transmission signal waveform of the method of the present invention is the fifth.
Although the signal waveform is the same in the sections (1) and (3) as shown in the figure, in the section (2), as shown in FIG.
It is similar to the SC signal waveform, and good compatibility is obtained. In the signal waveform shown in FIG. 7, the vertical high-frequency luminance signal component is, for example, an FM wave having an amplitude of about 0.3 V, and is superimposed on the OV black pedestal level in a signal format substantially the same as the color burst signal.
上述のように垂直方向輝度信号成分をFM搬送信号の形
態で伝送する場合における副搬送波周波数f0とFM搬送信
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ットパターン
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f0は、色副搬送波周波数と
同様に、上述のドッ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。FIG. 8 shows a spectrum representing the relationship between the subcarrier frequency f 0 and the frequency band B of the FM carrier signal when the vertical luminance signal component is transmitted in the form of an FM carrier signal as described above. In this case, it is assumed that the receiving-side image signal conversion device shown in FIG. 6 includes an FM demodulation circuit in the NTSC decoder 7. Further, in such a case, a dot pattern appears on both upper and lower end regions on a normal reproduction screen of the receiver, but it does not visually interfere much. Further, the sub-carrier frequency f 0 needs to be selected so that the above-mentioned dot pattern does not become a fixed pattern on the screen, like the color sub-carrier frequency.
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FM搬送
信号レベルおよびセットアップレベル、あるいは、副搬
送波周波数f0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
帯域では通例示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 description, an example of compatibility signal conversion between a high-definition signal having 1125 scanning lines and an NTSC signal having 525 scanning lines has been described, but the compatibility in the image signal transmission method of the present invention has been described. The signal conversion is not limited to this example, and also in the above-described example, the color burst signal superimposition level SV and the superimposed video signal level in the upper and lower end regions (2) of the reproduction screen, that is, the FM carrier signal level and the setup level Alternatively, the sub-carrier frequency f 0 and the signal bandwidth B are not fixed to the values described above. Further, the information signal transmitted to the upper and lower end regions (2) of the reproduction screen is not limited to the vertical high-frequency luminance signal, but may be any high-definition signal not transmitted in the NTSC signal band, such as a high-frequency color signal component. It can be an information signal.
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。In the line converter in the transmission system of the present invention, if the number of fields per second is the same, not only between the interlaced images described above, but also between the interlaced images and the progressively scanned images, or between the progressively scanned images. Scanning line number conversion can be performed in a similar manner.
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
換処理一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、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フィールド期間距てた入力画像信号の加算
器16における和の1/2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182n-1〜
181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フィ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182n-1〜180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X2n+1〜X0
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YL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。In the line converter for performing the conversion of the number of scanning lines, all the signal characteristic conversion processing in the vertical direction accompanying the conversion of the number of scanning lines is performed. For example, a horizontal signal characteristic conversion process is also performed. Among them, conversion of the number of scanning lines as vertical signal processing is performed as shown in FIG. 9 as shown in FIG. 9 according to the “scanning line number conversion method” described in Japanese Patent Application Laid-Open No. Sho 60-66582 proposed by the present inventors. The average of the sum of the input image signals two fields apart from the input / output terminals of the field memories 15-1 and 15-2 connected in series and obtained by the 1/2 coefficient unit 17 in the adder 16 is regarded as an odd field image signal. Cascaded line memory 18 2n-1 ~
18 1 and the field memories 15-1, 15-
Supplies the input image signal was 1 field distance from the midpoint of the second series connection to the even field line memories 18 2n-1 ~ 18 0 connected in cascade as an image signal, sequentially line period from such cascaded line memory Delayed image signal X 2n + 1 to X 0
Are supplied in parallel to the coefficient / adders 19-1 to 19-m, and the output signals which are multiplied by the respective coefficients and weighted and then added to each other are switched in principle by the switch 20 and are actually switched. appropriately converted by adding by the adder 22 is subjected to weighted output image signal Y L configuration the number of scanning lines conversion device so as to form a by each coefficient units 21-1,21-m as shown in FIG. 10 Performed by
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、縦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け係数を適切に設定
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 principle of operation of the scanning line number conversion apparatus having such a configuration is as follows. The principle of the operation is that an input image signal is subjected to interpolation of scanning lines, and once converted into a sequential scanning image signal having scanning lines of the least common multiple of the number of input / output scanning lines. Appropriately set the number of cascade-connected line memories and the weighting coefficient of each coefficient unit so that the above-described interpolation and thinning in the scanning line number conversion process of thinning out the scanning lines to obtain an output image signal can be realized at a stroke. By doing so, conversion of the number of scanning lines between any desired input and output image signals is enabled, and required vertical signal characteristic conversion, that is, for example, a vertical low-frequency signal component and a high-frequency signal in the transmission system of the present invention. Separation and extraction from components are performed.
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NTSC輝度信号と同図（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
プリングにより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 the signal characteristic conversion processing in the horizontal direction on the scanning line accompanying the scanning line coefficient conversion, in addition to the above-described time axis compression, time division multiplexing, and the like, for example, the Showa As described in the "band compression transmission system" described in the specification of the patent application dated January 29, 631, between the NTSC luminance signal of the spectrum shown in FIG. 11 (a) and the Hi-Vision luminance signal of the spectrum shown in FIG. 11 (b). At the time of image signal conversion in (1), signal characteristics conversion such as subjecting a broadband Hi-Vision luminance signal to folding multiplexing by sub-sampling and compressing the band to the signal form shown in FIG. Shall be.
（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 of a wide-angle image signal such as a Hi-Vision signal, which has conventionally occurred when narrow-band transmission is performed while maintaining compatibility with the NTSC signal, is maintained. The degradation is avoided by transmitting the high-definition information signal necessary for the reconstruction reproduction of the wide-band wide-angle image to the blank areas at the upper and lower ends generated in the converted output NTSC reproduction screen without disturbing the viewing of the NTSC reproduction image, and A special effect that a wide-angle image with high definition can be reproduced and displayed is 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図は同じくその改良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図は同じく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 15−1,15−２……フィールドメモリ 17,21−１〜２−ｍ……係数器 180〜182n+1……ラインメモリ 19−１〜19−ｍ……係数・加算器 20……切換器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. FIG. 4 is a waveform diagram showing an NTSC system color image signal waveform, FIG. 5 is a waveform diagram showing an example of an improved NTSC system color image signal waveform according to the present invention, FIG. 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 color image signal waveform according to the present invention, and FIG. Similarly, a spectrum diagram showing an example of the improved NTSC type color image signal, FIG. 9 is a block diagram showing a configuration of the scanning line number conversion device, and FIG. Block diagram showing the 11 (a) to (c) are spectral diagrams sequentially showing the principle of folded multi-band compression. 1-4,9-11,13,14 line converter 5 NTSC encoder 6,8 control unit 7 NTSC decoder 12,16,22 adder 15-1,15-2 ...... field memory 17,21-1~2-m ...... coefficient unit 18 0 ~18 2n + 1 ...... line memories 19 - 1 through 19-m ...... coefficient-adder 20 ...... switcher
フロントページの続き (72)発明者 西澤 台次 東京都世田谷区砧１丁目10番11号 日本 放送協会放送技術研究所内 (72)発明者 矢野 澄男 東京都世田谷区砧１丁目10番11号 日本 放送協会放送技術研究所内 (56)参考文献 特開 昭61−32682（ＪＰ，Ａ) 特開 昭62−84685（ＪＰ，Ａ)Continued on the front page (72) Inventor Taiji Nishizawa 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (72) Inventor Sumio Yano 1-110 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting (56) References JP-A-61-32682 (JP, A) JP-A-62-84685 (JP, A)
Claims (1)
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画
像信号伝送方式。In transmitting a wideband image signal having a predetermined number of images per second, a large aspect ratio, and a large number of scanning lines in a narrow band, the predetermined number of images per second, a small aspect ratio, Of the same number of scan lines as the narrow band image signal having a small number of lines, the number of scan lines corresponding to the ratio of the aspect ratio between the narrow band image signal and the wide band image signal causes a vertical direction of the wide band image signal. The low-band signal component is subjected to the conversion of the number of scanning lines and sub-sampling to perform narrowband transmission, and the remaining number of scanning lines is used to convert the number of scanning lines and sub-sampling to the high-band signal component in the vertical direction of the wideband image signal. And transmitting the wideband image signal in a narrowband 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 JPH01200881A (en) | 1989-08-14 |
| JP2594596B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2799713B2 (en) * | 1988-09-29 | 1998-09-21 | パイオニア株式会社 | MUSE-NTSC conversion method |
| JP2882584B2 (en) * | 1988-09-30 | 1999-04-12 | 株式会社東京放送 | Widescreen television broadcasting method compatible with existing television broadcasting methods |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01200881A (en) | 1989-08-14 |
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