JPH0233292A - Television signal processor - Google Patents
Television signal processorInfo
- Publication number
- JPH0233292A JPH0233292A JP18430488A JP18430488A JPH0233292A JP H0233292 A JPH0233292 A JP H0233292A JP 18430488 A JP18430488 A JP 18430488A JP 18430488 A JP18430488 A JP 18430488A JP H0233292 A JPH0233292 A JP H0233292A
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- 238000006243 chemical reaction Methods 0.000 claims abstract 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract 2
- 238000000926 separation method Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 13
- 239000002131 composite material Substances 0.000 description 12
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
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- 230000006866 deterioration Effects 0.000 description 4
- 230000002542 deteriorative effect Effects 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 2
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- 238000001228 spectrum Methods 0.000 description 2
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- 230000000593 degrading 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、テレビジョン放送の画質を改善するテレビジ
ョン信号処理装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a television signal processing device for improving the image quality of television broadcasts.
従来の技術
我が国の現在のＮＴＳＣ（ナショナル テレビジョン
システム コミッテ４ （Ｎａｔｉｏｎａｌ Ｔｅ１
ｅ−ｖｉｓｔｏｎ Ｓｙｓｔｅｍ Ｃｏｍｍ１ｔｔｅｅ
） ）方式によるカラーテレビジョン放送が昭和３５
年に開始されて以来、２５年以上が経過した。その間、
高精細な画面に対する要求と、テレビジテン受信機の性
能向上に伴い、各種の新しいテレビジョン方式が提案さ
れている。また、サービスされる番組の内容自体も単な
るスタジオ番組や中継番組などから、シネマサイズの映
画の放送など、より高画質で臨場感を伴う映像を有する
番組へと変化してきている。Conventional technology Japan's current NTSC (National Television Network)
System Committee 4 (National Te1
e-viston System Comm1ttee
) Color television broadcasting using the ) method began in 1962.
More than 25 years have passed since it started in 2017. meanwhile,
With the demand for high-definition screens and the improved performance of television receivers, various new television systems have been proposed. Furthermore, the content of the programs provided is changing from simple studio programs and relay programs to programs with higher quality and more realistic images, such as cinema-sized movie broadcasts.
このＮＴＳＣ方式は、走査線数５２５本、２：１飛越走
査、輝度信号水平帯域幅４．２ＮＨ４、アスペクト比４
：３という諸仕様を有している（例えば、文献放送技術
双書 カラーテレビジョン 日本放送協会績、日本放送
出版協会、１９６１年、参照）。This NTSC system has 525 scanning lines, 2:1 interlaced scanning, a luminance signal horizontal bandwidth of 4.2NH4, and an aspect ratio of 4.
:3 (for example, see Literature Broadcasting Technology Bibook, Color Television, published by Japan Broadcasting Corporation, Japan Broadcasting Publishing Association, 1961).
この方式では輝度信号と色信号を周波数多重で伝送する
ため、輝度信号と色信号の信号帯域の拡がりによっては
両信号が重なり、受信側で両信号を分離することが困難
な場合がある。その結果輝度信号と色信号の間でクロス
トークが発生し、クロスカラーやドツト妨害等の大きな
画質劣化を招いている。In this method, the luminance signal and chrominance signal are transmitted by frequency multiplexing, so depending on the spread of the signal bands of the luminance signal and chrominance signal, the two signals may overlap, making it difficult to separate the two signals on the receiving side. As a result, crosstalk occurs between the luminance signal and the color signal, causing significant deterioration in image quality such as cross color and dot interference.
そこで再生側の輝度信号と色信号の分離の際にクロスト
ークが発生しないように、あらかじめ送信側で輝度信号
と色信号の帯域制限をする方法が考案されている〔ファ
ロージャ他、 ＳＭＰＴＥジャーナル、９６巻、７５０
〜７６１ページ、 １９８７年８月（Ｆａｒｏｕｄｊａ
ｅｔ ａｌ＋ ＳＭＰＴＥ Ｊｏｕｒｎａｌ、 ｖｏ
１９６． ｐｐ７５０−７６１． Ａｕｇ、 １９８
７） ］。Therefore, in order to prevent crosstalk from occurring when the luminance signal and chrominance signal are separated on the reproduction side, a method has been devised in which the bands of the luminance signal and chrominance signal are limited in advance on the transmission side [Faruja et al., SMPTE Journal, 96]. Volume, 750
~761 pages, August 1987 (Faroudja
et al+ SMPTE Journal, vo
196. pp750-761. August, 198
7) ].
以下本発明に関わるこの従来例について、図面を参照し
ながら説明する。第１０図は送信側での信号処理を示す
ブロック図である。５０は輝度信号Ｙ入力端子、５１は
広帯域色信号Ｉ入力端子、５２は狭帯域色信号Ｑ入力端
子、５３は第１垂直・水平フィルタ、５４は加算器、５
５は直交変調器、５６は垂直フィルタ、５７は合成信号
出力端子である。輝度信号Ｙは、第１垂直・水平フィル
タ５３で水平周波数的２．１ＭＨｚ〜４．２ＭＨｚかつ
、垂直周波数的５２５／４ ｃｐｈ（ｃｙｃｌｅ ｐｅ
ｒ ｈｅｉｇｈｔ ＋高さ方向のサイクル数）以上の帯
域の信号成分が除去される。広帯域色信号Ｉと狭帯域色
信号Ｑは直交変調器５５で従来どうり変調される。直交
変調器５５の出力は垂直フィルタ５６で垂直周波数方向
に帯域制限される。第１垂直・水平フィルタ５３及び垂
直フィルタ５６の出力は加算器５４で加算され、合成信
号となる９合成信号は例えば振幅変調によりテレビジボ
ン信号としアンテナから送出される。第１垂直・水平フ
ィルタ５３及び垂直フィルタ５６で帯域制限された輝度
信号及び色信号のスペクトルの一例を第１１図に示す。This conventional example related to the present invention will be explained below with reference to the drawings. FIG. 10 is a block diagram showing signal processing on the transmitting side. 50 is a luminance signal Y input terminal, 51 is a wideband color signal I input terminal, 52 is a narrowband color signal Q input terminal, 53 is a first vertical/horizontal filter, 54 is an adder, 5
5 is a quadrature modulator, 56 is a vertical filter, and 57 is a composite signal output terminal. The luminance signal Y is filtered by the first vertical/horizontal filter 53 to have a horizontal frequency of 2.1 MHz to 4.2 MHz and a vertical frequency of 525/4 cph (cycle pe
Signal components in a band equal to or greater than r height + number of cycles in the height direction are removed. The wideband chrominance signal I and the narrowband chrominance signal Q are conventionally modulated by a quadrature modulator 55. The output of the quadrature modulator 55 is band-limited in the vertical frequency direction by a vertical filter 56. The outputs of the first vertical/horizontal filter 53 and the vertical filter 56 are added by an adder 54, and the nine composite signals are converted into a television dibon signal by amplitude modulation, for example, and sent out from an antenna. FIG. 11 shows an example of the spectrum of the luminance signal and color signal band-limited by the first vertical/horizontal filter 53 and the vertical filter 56.
斜線部分が色信号である。ｆは時間周波数、νは垂直周
波数で、水平周波数的２．１ＭＨｚ〜４．２ＭＨｚの範
囲の信号の存在領域を表している。このように帯域制限
をして伝送すれば、受信側で発生する輝度信号と色信号
とのクロストークは軽減することができる。The shaded area is the color signal. f is a time frequency, and ν is a vertical frequency, which represents the region in which a signal exists in the horizontal frequency range of 2.1 MHz to 4.2 MHz. If the band is limited and transmitted in this manner, crosstalk between the luminance signal and the color signal occurring on the receiving side can be reduced.
発明が解決しようとする課題
以上のように、現行放送では受信側で輝度信号と色信号
との間でクロストークが発生し、再生映像に画質劣化が
生じる場合がある。そしてこのクロストークが発生しな
いように、あらかじめ送信側で輝度信号と色信号の帯域
を制限する方法が考案されている。しかしながら帯域を
制限するということは、情報を削るということであり、
この場合輝度信号の水平周波数と垂直周波数の高い成分
の削除、即ち斜め解像度が静止画、動画にかかわらず劣
化することになる。Problems to be Solved by the Invention As described above, in current broadcasting, crosstalk occurs between the luminance signal and the color signal on the receiving side, which may cause deterioration in the image quality of the reproduced video. In order to prevent this crosstalk from occurring, a method has been devised in advance to limit the bands of the luminance signal and color signal on the transmitting side. However, limiting the bandwidth means reducing information.
In this case, the high horizontal frequency and vertical frequency components of the luminance signal are deleted, ie, the diagonal resolution deteriorates regardless of whether it is a still image or a moving image.
本発明はかかる課題に鑑みてなされたもので、現行のテ
レビジョン方式と両立性があり、輝度信号の斜め解像度
を劣化させることなく、輝度信号と色信号のクコストー
クを軽減するテレビジョン信号処理装置を提供すること
を目的とする。The present invention has been made in view of the above problems, and is a television signal processing device that is compatible with current television systems and reduces star talk between brightness signals and color signals without degrading the diagonal resolution of brightness signals. The purpose is to provide
課題を解決するための手段
前記課題を解決するために本発明のテレビジョン信号処
理装置は、輝度信号の水平周波数と垂直周波数の高い斜
め信号成分を除去する手段と、前記斜め信号成分を周波
数多重する手段と、色信号の水平周波数と垂直周波数の
帯域を制限する手段と、輝度信号と色信号を分離する手
段と、時間−垂直周波数平面で色信号とは共役の第１、
第３象限に位置する多重信号と色信号を分離する手段と
、前記多重信号を周波数変換する手段を備えたものであ
る。Means for Solving the Problems In order to solve the above problems, the television signal processing device of the present invention includes means for removing diagonal signal components with high horizontal and vertical frequencies of a luminance signal, and frequency multiplexing of the diagonal signal components. means for limiting the horizontal and vertical frequency bands of the color signal; means for separating the luminance signal and the color signal;
The apparatus includes means for separating the multiplexed signal and color signal located in the third quadrant, and means for frequency converting the multiplexed signal.
作用
本発明は、前記した装置によって、現行テレビジョン放
送の規格の帯域内に輝度信号の斜め成分を多重伝送する
テレビジョン信号を生成することにより、専用の受信機
では従来のテレビジョン放送の映像のみならず多重され
た情報をも得ることができる。すなわち静止画、動画に
かかわらず、輝度信号の斜め解像度の劣化や、クロスカ
ラー、ドツト妨害がほとんど発生しない映像を得ること
ができる。さらに現行のテレビジョン受信機でも従来の
テレビジョン放送の映像として支障なく受信することが
できる。Effect of the present invention The present invention uses the above-described device to generate a television signal that multiplexes and transmits diagonal components of a luminance signal within the band of the current television broadcast standard. Not only that, but also multiplexed information can be obtained. That is, regardless of whether it is a still image or a moving image, it is possible to obtain an image in which there is almost no deterioration in the diagonal resolution of the luminance signal, cross color, or dot interference. Furthermore, even current television receivers can receive the video as conventional television broadcasting without any problems.
実施例
以下本発明の一実施例のテレビジョン信号処理装置につ
いて、図面を参照しながら説明する。Embodiment Hereinafter, a television signal processing apparatus according to an embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の一実施例に係わる送信側でのテレビ
ジョン信号処理装置のブロック図である。FIG. 1 is a block diagram of a television signal processing device on the transmission side according to an embodiment of the present invention.
１は輝度信号Ｙ入力端子、２は広帯域色信号Ｉ入力端子
、３は狭帯域色信号Ｑ入力端子、４は第１垂直・水平フ
ィルタ、１０は第２垂直・水平フィルタ、１１は第３垂
直・水平フィルタ、５は減算器、６は乗算器、７はフィ
ルタ、８．１３は加算器、９はスイッチ、１２は直交変
調器、１４は合成信号出力端子である。輝度信号Ｙは、
第１垂直・水平フィルタ４で水平周波数が約２．１ＭＨ
ｚ〜４．２ＭＨ２かつ、垂直周波数的５２５／４ ｃｐ
ｈ以上の帯域の信号成分が除去される。なおフィルタの
特性はこれに限るものではない。このフィルタの特性は
、例えば水平周波数の次元でのＢＰＦ （バンドパスフ
ィルタ）、垂直周波数の次元でのＢＰＦの組合せ等によ
り、得ることができる。−例を第３図に示す。μは水平
周波数、νは垂直周波数であり、斜線部分が除去される
領域であり、この信号を多重信号とする。1 is a luminance signal Y input terminal, 2 is a wideband color signal I input terminal, 3 is a narrowband color signal Q input terminal, 4 is a first vertical/horizontal filter, 10 is a second vertical/horizontal filter, 11 is a third vertical・Horizontal filter, 5 is a subtracter, 6 is a multiplier, 7 is a filter, 8.13 is an adder, 9 is a switch, 12 is a quadrature modulator, and 14 is a composite signal output terminal. The luminance signal Y is
The horizontal frequency of the first vertical/horizontal filter 4 is approximately 2.1 MH
z~4.2MH2 and vertical frequency 525/4 cp
Signal components in a band of h or more are removed. Note that the characteristics of the filter are not limited to these. The characteristics of this filter can be obtained, for example, by a combination of a BPF (band pass filter) in the horizontal frequency dimension and a BPF in the vertical frequency dimension. - An example is shown in FIG. μ is the horizontal frequency, ν is the vertical frequency, the shaded area is the area to be removed, and this signal is a multiplexed signal.
次に輝度信号Ｙから第１垂直・水平フィルタ４で斜め成
分が除去された信号を減算器５で減算し斜め成分の信号
を得る。なお斜め成分はフィルタの構成によっては第１
垂直・水平フィルタ４から直接得ることができる。Ｍ算
器５の出力である斜め成分を多重信号とし、この信号は
乗算器６で周波数ｆａのキャリアで周波数変換され、フ
ィルタフにより不要な成分が除去される。フィルタフの
出力と第１垂直・水平フィルタ４の出力を加算器８で加
算する。スイッチ９は例えば画素毎の動きに応じて、静
止画及び静止画に近い場合には輝度信号Ｙを、動画では
加算器８の出力を選択する０色信号■、Ｑはそれぞれ第
２垂直・水平フィルタ１０、第３垂直・水平フィルタ１
１で帯域制限され、直交変調器１２で従来どうり変調さ
れる。直交変調器１２とスイッチ９の出力は加算器１３
で加算され合成信号となる。合成信号は例えば振幅変調
によりテレビジョン信号としアンテナから送出される。Next, the signal from which the diagonal component has been removed by the first vertical/horizontal filter 4 is subtracted from the luminance signal Y by the subtracter 5 to obtain a signal of the diagonal component. Note that the oblique component may be the first component depending on the filter configuration.
It can be obtained directly from the vertical and horizontal filters 4. The diagonal component output from the M multiplier 5 is used as a multiplexed signal, and this signal is frequency-converted by a multiplier 6 using a carrier having a frequency fa, and unnecessary components are removed by a filter. An adder 8 adds the output of the filter and the output of the first vertical/horizontal filter 4. For example, the switch 9 selects the luminance signal Y for a still image or a near-still image, and the output of the adder 8 for a moving image, depending on the movement of each pixel. Filter 10, third vertical/horizontal filter 1
1, and modulated by a quadrature modulator 12 in the conventional manner. The outputs of the quadrature modulator 12 and the switch 9 are sent to the adder 13
are added to form a composite signal. The composite signal is converted into a television signal by, for example, amplitude modulation and sent from an antenna.
第１垂直・水平フィルタ４で帯域制限された輝度信号の
スペクトルの一例を第１１図に示す。ｆは時間周波数、
νは垂直周波数で、水平周波数的２．１ＭＨ２〜４．２
ＭＨｚの範囲の信号の存在領域を表している。第２垂直
・水平フィルタ１０、第３垂直・水平フィルタ１１の特
性の一例をそれぞれ第５図、第６図に示す。An example of the spectrum of the luminance signal band-limited by the first vertical/horizontal filter 4 is shown in FIG. f is time frequency,
ν is the vertical frequency, and the horizontal frequency is 2.1MH2 to 4.2
It represents the region in which signals exist in the MHz range. Examples of the characteristics of the second vertical/horizontal filter 10 and the third vertical/horizontal filter 11 are shown in FIGS. 5 and 6, respectively.
なお静止画のときには斜め成分を除去しなくても受信側
でフレーム間演算等を施すことにより、輝度信号と色信
号をクロストークなく分離することができる。受信側で
のフレーム間演算により輝度信号と色信号を分離するＹ
Ｃ分離の一例を第８図に示す、輝度信号を抽出するフィ
ルタの通過帯域を左下がりの斜線で表す。よって、第１
図ではスイッチ９で静止画のときには第１垂直・水平フ
ィルタ４等を通さない輝度信号Ｙを選択するようにして
いる。フレーム間演算のＹＣ分離処理をしない受信機に
対しては、静止画であっても斜め成分は除去したほうが
よい。図１のテレビジョン信号処理装置において伝送す
る輝度信号の帯域を示したのが第４図である。ｆば時間
周波数、νは垂直周波数で、水平周波数約２．１ＭＨｚ
〜４．２ＭＨｚの範囲の信号を表している。斜線部分が
斜め成分でこれを多重信号とする。Note that in the case of a still image, even if the oblique component is not removed, the luminance signal and color signal can be separated without crosstalk by performing interframe calculations on the receiving side. Y that separates the luminance signal and color signal by interframe calculation on the receiving side
An example of C separation is shown in FIG. 8, where the passband of a filter for extracting a luminance signal is indicated by a diagonal line slanting downward to the left. Therefore, the first
In the figure, a switch 9 is used to select a luminance signal Y that does not pass through the first vertical/horizontal filter 4 etc. when the image is a still image. For receivers that do not perform YC separation processing for interframe calculations, it is better to remove oblique components even if the image is a still image. FIG. 4 shows the band of the luminance signal transmitted in the television signal processing device of FIG. 1. f is the time frequency, ν is the vertical frequency, and the horizontal frequency is approximately 2.1 MHz.
It represents a signal in the range of ~4.2MHz. The shaded portion is a diagonal component, which is considered as a multiplexed signal.
多重信号は周波数ｆａのキャリアで第７図に示した斜線
部分の多重領域に周波数変換される。第４図と同様にｆ
は時間周波数、νは垂直周波数で、水平周波数約２．１
ＭＨ２〜４．２ＭＨ２の範囲の信号を表している。The multiplexed signal is frequency-converted to the multiplexed region shown in the shaded area in FIG. 7 using a carrier of frequency fa. Similarly to Figure 4, f
is the time frequency, ν is the vertical frequency, and the horizontal frequency is approximately 2.1
It represents a signal in the range of MH2 to 4.2MH2.
第２図は、本発明の一実施例に係わる受信側でのテレビ
ジョン信号処理装置のブロック図である。FIG. 2 is a block diagram of a television signal processing device on the receiving side according to an embodiment of the present invention.
２１は合成信号入力端子、２２はＹＣ分離回路、２３は
色信号・多重信号分離回路、２４は乗算器、２５はフィ
ルタ、２６は加算器、２７は色信号復調回路、２８は輝
度信号Ｙ出力端子、２９は広帯域色信号■出力端子、３
０は狭帯域色信号Ｑ出力端子である。送信側のテレビジ
ョン信号処理装置で合成された合成信号はまずＹＣ分離
回路２２で輝度信号とそれ以外の信号（ここでは第７図
に右下がり、左下がりの斜線で示した色信号と多重信号
）を分離する０色信号と多重信号は色信号・多重信号分
離回路２３で分離される。多重信号は周波数ｆａのキャ
リアでもとの斜め領域に変換されるフィルタ２５で乗算
により発生する不要な成分を除去し加算器２６に入力す
る。ここでＹＣ分離回路２２の出力と加算され輝度信号
Ｙとなる０色信号・多重信号分離回路２３の出力である
色信号は、色信号復調回路２７で周知の技術で広帯域色
信号■と狭帯域色信号Ｑに復調される。21 is a composite signal input terminal, 22 is a YC separation circuit, 23 is a color signal/multiple signal separation circuit, 24 is a multiplier, 25 is a filter, 26 is an adder, 27 is a color signal demodulation circuit, and 28 is a luminance signal Y output Terminal, 29 is wideband color signal Output terminal, 3
0 is a narrowband color signal Q output terminal. The composite signal synthesized by the television signal processing device on the transmitting side is first sent to the YC separation circuit 22 where it is divided into a luminance signal and other signals (in this case, the color signal and multiplexed signal shown by diagonal lines downward to the right and downward to the left in FIG. 7). ) and the multiplexed signal are separated by a color signal/multiplexed signal separation circuit 23. The multiplexed signal is converted into the original diagonal domain using a carrier of frequency fa, filter 25 removes unnecessary components generated by multiplication, and the signal is input to adder 26 . Here, the color signal which is the output of the 0 color signal/multiple signal separation circuit 23 which is added to the output of the YC separation circuit 22 and becomes the luminance signal Y is converted into a wideband color signal (■) and a narrowband color signal by a color signal demodulation circuit 27 using well-known technology. It is demodulated into a color signal Q.
色信号・多重信号分離回路２３は、第７図の第１、第３
象限にある多重信号と、第２、第４象限にある色信号を
分離するための回路であり、フィールド間演算するフィ
ルタ等によって容易に構成することができる。The color signal/multiplex signal separation circuit 23 is connected to the first and third circuits in FIG.
This is a circuit for separating the multiplexed signal in the quadrant and the color signals in the second and fourth quadrants, and can be easily configured with a filter or the like that performs inter-field calculations.
このように、送信側で輝度信号の斜め成分を除去し、色
信号の垂直方向の帯域を制限して送っているので、ＹＣ
分離回路２２で輝度信号と色信号の間でクロストークは
発生しない、また多重信号である輝度１号の斜め成分は
周波数ｆａのキャリアによって復元される。従って輝度
信号の斜め解像度が劣化することなく、また輝度信号と
色信号のクロストークによるクロスカラーやドツト妨害
等の画質劣化のない、鮮明な映像を得ることができる。In this way, since the oblique component of the luminance signal is removed on the transmitting side and the vertical band of the color signal is limited and sent, YC
No crosstalk occurs between the luminance signal and the chrominance signal in the separation circuit 22, and the diagonal component of luminance No. 1, which is a multiplexed signal, is restored by the carrier of frequency fa. Therefore, it is possible to obtain a clear image without deteriorating the diagonal resolution of the luminance signal and without deteriorating the image quality such as cross color or dot interference due to crosstalk between the luminance signal and color signal.
また多重信号は第７図の第１、第３象限に位置するので
、従来のテレビジョン受信機で受信した場合、色信号と
して復調されるが、位相がフィールド毎に色信号と逆相
となるため、フィールド毎に補色となり検知されにくく
なる。すなわち、多重信号による現行テレビジョンに対
する妨害はほとんど発生しない。Furthermore, since the multiplexed signal is located in the first and third quadrants of Figure 7, when received by a conventional television receiver, it is demodulated as a color signal, but the phase is opposite to the color signal for each field. Therefore, each field becomes a complementary color, making it difficult to detect. That is, there is almost no interference with existing televisions due to multiplexed signals.
第９図は、本発明の一実施例に係わる送信側及び受信側
でのテレビジョン信号処理装置のブロック図である。送
信側で時間軸圧縮、受信側で時間軸伸長する処理系を含
むテレビジョン信号処理装置について考える。７１は輝
度信号Ｙ入力端子、７２は広帯域色信号■入力端子、７
３は狭帯域色信号Ｑ入力端子、７４．７５．７６は時間
軸圧縮回路、７７は第１垂直・水平フィルタ、７８は第
２垂直・水平フィルタ、７９は第３垂直・水平フィルタ
、８０は加算器、８１は直交変調器、８２は合成信号出
力端子、８３は合成信号入力端子、８４はＹＣ分離回路
、８５は色信号復調回路、８６．８７．８８は時間軸伸
長回路、８９は輝度信号Ｙ出力端子、９０は広帯域色信
号ｌ出力端子、９１は狭帯域色信号Ｑ出力端子である。FIG. 9 is a block diagram of a television signal processing device on the transmitting side and the receiving side according to an embodiment of the present invention. Consider a television signal processing device that includes a processing system that compresses the time axis on the transmitting side and expands the time axis on the receiving side. 71 is a luminance signal Y input terminal, 72 is a wideband color signal input terminal, 7
3 is a narrowband color signal Q input terminal, 74, 75, 76 is a time axis compression circuit, 77 is a first vertical/horizontal filter, 78 is a second vertical/horizontal filter, 79 is a third vertical/horizontal filter, 80 is a Adder, 81 is a quadrature modulator, 82 is a composite signal output terminal, 83 is a composite signal input terminal, 84 is a YC separation circuit, 85 is a color signal demodulation circuit, 86, 87, 88 is a time axis expansion circuit, 89 is a luminance A signal Y output terminal, 90 a wideband color signal l output terminal, and 91 a narrowband color signal Q output terminal.
輝度信号Ｙ、広帯域色信号■、狭帯域色信号Ｑはそれぞ
れ時間軸圧縮回路７４．７５．７６で時間軸圧縮される
。時間軸圧縮回路７４．７５．７６の出力はそれぞれ第
１垂直・水平フィルタ７７、第２垂直・水平フィルタ７
８、第３垂直・水平フィルタ７９により帯域制限される
。The luminance signal Y, the wideband color signal (2), and the narrowband color signal Q are time-domain compressed by time-domain compression circuits 74, 75, and 76, respectively. The outputs of the time axis compression circuits 74, 75, and 76 are the first vertical/horizontal filter 77 and the second vertical/horizontal filter 7, respectively.
8. Bandwidth limited by third vertical/horizontal filter 79.
第１垂直・水平フィルタ７７、第２垂直・水平フィルタ
７８、第３垂直・水平フィルタ７９の特性の一例を第４
図、第５図、第６図に示す。第２垂直・水平フィルタ７
８、第３垂直・水平フィルタ７９の出力は直交変調器８
１で変調され、加算器８０で第１垂直・水平フィルタ７
７の出力と加算され、合成信号となる。合成信号はＹＣ
分離回路８４で輝度信号と色信号に分離される。色信号
は色信号復調回路８５で周知の技術で復調される。ＹＣ
分離回路８４、色信号復調回路８５の出力はそれぞれ時
間軸伸長回路８６．８７．８８で送信側の時間軸圧縮に
応じて時間軸伸長され、輝度信号Ｙ、広帯域色信号■、
狭帯域色信号Ｑとなる。An example of the characteristics of the first vertical/horizontal filter 77, the second vertical/horizontal filter 78, and the third vertical/horizontal filter 79 is shown in the fourth example.
5 and 6. Second vertical/horizontal filter 7
8. The output of the third vertical/horizontal filter 79 is the quadrature modulator 8
1, and an adder 80 modulates the first vertical/horizontal filter 7.
It is added with the output of 7 to form a composite signal. The composite signal is YC
A separation circuit 84 separates the signal into a luminance signal and a color signal. The color signal is demodulated by a color signal demodulation circuit 85 using a well-known technique. YC
The outputs of the separation circuit 84 and chrominance signal demodulation circuit 85 are time-axis expanded by time-axis expansion circuits 86, 87, and 88, respectively, according to the time-axis compression on the transmitting side, and are converted into a luminance signal Y, a wideband chrominance signal ■,
This becomes a narrowband color signal Q.
受信側で時間軸伸長する処理系が含まれると、ＹＣ分離
の際に発生する色信号から輝度信号へのクロストーク、
すなわちドツト妨害の見え方が異なってくる。これは時
間軸伸長することにより、低周波のドツトとなり、人間
の視覚特性からこのドツトはより目立つ結果となり、大
きな画質劣化を招く。そこで、本発明の一実施例で示し
たように、送信側で第９図の第１垂直・水平フィルタ７
７、第２垂直・水平フィルタ７８、第３垂直・水平フィ
ルタ７９で帯域制限することにより、ＹＣ分離の際に発
生する色信号から輝度信号へのクロストーク、すなわち
ドツト妨害を軽減することができる。なお画素毎の動き
に応じて各フィルタの特性を切り換えてもよい。If a processing system that expands the time axis is included on the receiving side, crosstalk from color signals to luminance signals that occurs during YC separation,
In other words, the appearance of dot interference becomes different. When the time axis is expanded, this becomes a low-frequency dot, and this dot becomes more noticeable due to human visual characteristics, resulting in a large deterioration in image quality. Therefore, as shown in one embodiment of the present invention, on the transmitting side, the first vertical/horizontal filter 7 of FIG.
7. By limiting the band using the second vertical/horizontal filter 78 and the third vertical/horizontal filter 79, it is possible to reduce crosstalk from the color signal to the luminance signal, that is, dot interference, which occurs during YC separation. . Note that the characteristics of each filter may be switched depending on the movement of each pixel.
発明の効果
以上の説明から明らかなように、輝度信号の水平周波数
と垂直周波数の高い斜め信号成分を除去する手段と、前
記斜め信号成分を周波数多重する手段と、色信号の水平
周波数と垂直周波数の帯域を制限する手段と、輝度信号
と色信号を分離する手段と、時間−垂直周波数平面で色
信号とは共役の第１、第３象限に位置する多重信号と色
信号を分離する手段と、前記多重信号を周波数変換する
手段を設けることにより、送信側で輝度信号の斜め成分
を除去し、色信号の垂直方向の帯域を制限して送るので
、受信側でのＹＣ分離の際に輝度信号と色信号の間でク
ロストークは発生しない。また多重信号である輝度信号
の斜め成分は周波数ｆａのキャリアによって復元される
。従って輝度信号の斜め解像度が劣化することなく、ま
た輝度信号と色信号のクロストークによるクロスカラー
やドツト妨害等の画質劣化のない、鮮明な映像を得るこ
とができる。また多重信号は時間−垂直周波数平面で色
信号とは共役の第１、第３象限に位置するので、従来の
テレビジョン受信機で受信した場合、色信号として復調
されるが、位相がフィールド毎に色信号と逆相となるた
め、フィールド毎に補色となり検知されにくくなる。す
なわち、多重信号による現行テレビジョンに対する妨害
はほとんど発生せず、現行テレビジョンと両立性を保つ
ことができる。Effects of the Invention As is clear from the above description, there are provided means for removing diagonal signal components with high horizontal and vertical frequencies of a luminance signal, means for frequency multiplexing the diagonal signal components, and horizontal and vertical frequencies of color signals. means for separating the luminance signal and the chrominance signal; and means for separating the chrominance signal from a multiplexed signal located in the first and third quadrants conjugate to the chrominance signal in the time-vertical frequency plane. By providing a means for frequency converting the multiplexed signal, the diagonal component of the luminance signal is removed on the transmitting side, and the vertical band of the color signal is limited and sent, so that when the receiving side performs YC separation, the luminance No crosstalk occurs between the signal and the color signal. Further, the oblique component of the luminance signal, which is a multiplexed signal, is restored by the carrier of frequency fa. Therefore, it is possible to obtain a clear image without deteriorating the diagonal resolution of the luminance signal and without deteriorating the image quality such as cross color or dot interference due to crosstalk between the luminance signal and color signal. Furthermore, since the multiplexed signal is located in the first and third quadrants conjugate with the chrominance signal on the time-vertical frequency plane, when received by a conventional television receiver, it is demodulated as a chrominance signal, but the phase differs from field to field. Since the color signal is in reverse phase with the color signal, each field becomes a complementary color, making it difficult to detect. That is, there is almost no interference with current televisions due to multiplexed signals, and compatibility with current televisions can be maintained.
また受信側で時間軸伸長する処理系が含まれると、ＹＣ
分離の際に発生する色信号から輝度信号へのクロストー
ク、すなわちドツト妨害は低周波のドツトとなり、人間
の視覚特性からこのドツトはより目立つ結果となるが、
送信側であらかじめ帯域制限することにより、このドツ
ト妨害を軽減することができる。Also, if a processing system that expands the time axis is included on the receiving side, YC
Crosstalk from the color signal to the luminance signal that occurs during separation, that is, dot interference, results in low-frequency dots, and these dots are more noticeable due to human visual characteristics.
This dot interference can be reduced by limiting the band in advance on the transmitting side.
第１図は本発明の一実施例における送信側でのテレビジ
ョン信号処理装置のブロック図、第２図は本発明の一実
施例における受信側でのテレビジョン信号処理装置のブ
ロック図、第３図は輝度信号の垂直・水平フィルタの水
平−垂直周波数平面での特性図、第４図は輝度信号の垂
直・水平フィルタの時間−垂直周波数平面での特性図、
第５図は広帯域色信号の垂直・水平フィルタの特性図、
第６図は狭帯域色信号の垂直・水平フィルタの特性図、
第７図は合成信号の時間−垂直周波数平面での特性図、
第８図はＹＣ分離回路のフィルタの特性図、第９図は本
発明の一実施例における送信側で時間軸圧縮、受信側で
時間軸伸長する処理系を含むテレビジョン信号処理装置
のブロック図、第１０図は従来技術の一例である送信側
でのテレビジョン信号処理装置のブロック図、第１１図
は従来技術の一例で伝送される信号の帯域を示した特性
図である。
４．５３．７７・・・・・・第１垂直・水平フィルタ、
１０．７８・・・・・・第２垂直・水平フィルタ、１１
．７９・・・・・・第３垂直・水平フィルタ、６．２４
・・・・・・乗算器、２２．８４・・・・・・ＹＣ分離
回路、２３・・・・・・色信号・多重信号分離回路、５
６・・・・・・垂直フィルタ、？４．７５．７６・・・
・・・時間軸圧縮回路、８６．８７．８８・・・・・・
時間軸伸長回路。
代理人の氏名 弁理士 粟野重孝 はか１名凶
〉−
第
図
と
（ＣＰｌ’１
第
図
Ｙ（ｃｐｈｌ
ト
区
第
図
ν
（ｃＰｈＪ
ν（ｃＰｈ）
Ω
μ
（ｒｊＨｘＪ
第
図
第
図
（ＣＰｈｌ
）１［ＣＰｈ１
成FIG. 1 is a block diagram of a television signal processing device on the transmitting side according to an embodiment of the present invention, FIG. 2 is a block diagram of a television signal processing device on the receiving side according to an embodiment of the present invention, and FIG. The figure shows the characteristics of the vertical and horizontal filters for the luminance signal on the horizontal-vertical frequency plane, and Figure 4 shows the characteristics of the vertical and horizontal filters for the luminance signal on the time-vertical frequency plane.
Figure 5 is a characteristic diagram of vertical and horizontal filters for wideband color signals.
Figure 6 is a characteristic diagram of vertical and horizontal filters for narrowband color signals.
Figure 7 is a characteristic diagram of the composite signal on the time-vertical frequency plane.
FIG. 8 is a characteristic diagram of the filter of the YC separation circuit, and FIG. 9 is a block diagram of a television signal processing device including a processing system that compresses the time axis on the transmitting side and expands the time axis on the receiving side in one embodiment of the present invention. , FIG. 10 is a block diagram of a television signal processing device on the transmitting side, which is an example of the prior art, and FIG. 11 is a characteristic diagram showing the band of a signal transmitted in an example of the prior art. 4.53.77...First vertical/horizontal filter,
10.78...Second vertical/horizontal filter, 11
．． 79...Third vertical/horizontal filter, 6.24
...... Multiplier, 22.84 ... YC separation circuit, 23 ... Color signal/multiple signal separation circuit, 5
6... Vertical filter? 4.75.76...
...Time axis compression circuit, 86.87.88...
Time axis expansion circuit. Name of agent Patent attorney Shigetaka Awano [CPh1 formation
Claims (7)
号成分を除去する手段と、前記斜め信号成分を周波数多
重する手段と、色信号の水平周波数と垂直周波数の帯域
を制限する手段とを具備することを特徴とするテレビジ
ョン信号処理装置。(1) A means for removing a diagonal signal component having a high horizontal frequency and a high vertical frequency of a luminance signal, a means for frequency multiplexing the diagonal signal component, and a means for limiting a band of a horizontal frequency and a vertical frequency of a color signal. A television signal processing device characterized by:
周波数平面で色信号とは共役の第１、第３象限に位置す
る多重信号と色信号を分離する手段と、前記多重信号を
周波数変換する手段とを具備することを特徴とするテレ
ビジョン信号処理装置。(2) means for separating a luminance signal and a chrominance signal; a means for separating a chrominance signal from a multiplexed signal located in the first and third quadrants conjugate with the chrominance signal on a time-vertical frequency plane; 1. A television signal processing device comprising: means for frequency conversion.
号成分を除去する手段と、前記斜め信号成分を周波数多
重する手段と、色信号の水平周波数と垂直周波数の帯域
を制限する手段を具備する送信側の装置と、輝度信号と
色信号を分離する手段と、時間−垂直周波数平面で色信
号とは共役の第１、第３象限に位置する多重信号と色信
号を分離する手段と、前記多重信号を周波数変換する手
段とを具備する受信側の装置からなることを特徴とする
テレビジョン信号処理装置。(3) A means for removing diagonal signal components with high horizontal and vertical frequencies of the luminance signal, a means for frequency multiplexing the diagonal signal components, and a means for limiting the horizontal frequency and vertical frequency bands of the color signal. a transmitting side device, means for separating a luminance signal and a color signal, means for separating a multiplexed signal and a color signal located in the first and third quadrants conjugate to the color signal in the time-vertical frequency plane; 1. A television signal processing device comprising a receiving side device comprising means for frequency converting a multiplexed signal.
直周波数平面で色信号とは共役の第１、第３象限に位置
するように周波数変換する手段を具備することを特徴と
する請求項（１）または（３）のいずれかに記載のテレ
ビジョン信号処理装置。(4) The means for frequency multiplexing the diagonal signal component comprises means for converting the frequency so that it is located in the first and third quadrants conjugate with the color signal on the time-vertical frequency plane. The television signal processing device according to any one of (1) or (3).
間の演算により帯域制限する手段を具備することを特徴
とする請求項（２）または（３）のいずれかに記載のテ
レビジョン信号処理装置。(5) The television signal processing according to any one of claims (2) and (3), characterized in that the means for separating the multiplexed signal and the color signal comprises means for band-limiting by calculation between fields. Device.
周波数と垂直周波数の帯域を制限する手段とを具備する
ことを特徴とするテレビジョン信号処理装置。(6) A television signal processing device characterized by comprising means for time-base compressing a luminance signal and a color signal, and means for limiting horizontal frequency and vertical frequency bands.
周波数と垂直周波数の帯域を制限する手段とを具備する
送信側の装置と、輝度信号と色信号を分離する手段と、
時間軸伸長する手段とを具備する受信側の装置からなる
ことを特徴とするテレビジョン信号処理装置。(7) a transmission side device comprising means for compressing the time axis of the luminance signal and the chrominance signal, and means for limiting the horizontal frequency and vertical frequency bands, and means for separating the luminance signal and the chrominance signal;
What is claimed is: 1. A television signal processing device comprising: a receiving side device comprising means for time axis expansion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430488A JPH0233292A (en) | 1988-07-22 | 1988-07-22 | Television signal processor |
| US07/383,154 US5036386A (en) | 1988-07-22 | 1989-07-19 | Television signal processing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430488A JPH0233292A (en) | 1988-07-22 | 1988-07-22 | Television signal processor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0233292A true JPH0233292A (en) | 1990-02-02 |
Family
ID=16150993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18430488A Pending JPH0233292A (en) | 1988-07-22 | 1988-07-22 | Television signal processor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0233292A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59171387A (en) * | 1983-03-18 | 1984-09-27 | Hitachi Ltd | Method for constituting television signal |
| JPS62114393A (en) * | 1985-11-14 | 1987-05-26 | Nippon Hoso Kyokai <Nhk> | Color television signal processor |
| JPS62181587A (en) * | 1985-10-09 | 1987-08-08 | フアロ−ジヤ ラボラトリ−ズ，インコ−ポレイテツド | Method and apparatus for processing color television image signal which is subjected to right angle modulation |
| JPH01274582A (en) * | 1988-04-27 | 1989-11-02 | Pioneer Electron Corp | Transmission system for picture signal |
-
1988
- 1988-07-22 JP JP18430488A patent/JPH0233292A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59171387A (en) * | 1983-03-18 | 1984-09-27 | Hitachi Ltd | Method for constituting television signal |
| JPS62181587A (en) * | 1985-10-09 | 1987-08-08 | フアロ−ジヤ ラボラトリ−ズ，インコ−ポレイテツド | Method and apparatus for processing color television image signal which is subjected to right angle modulation |
| JPS62114393A (en) * | 1985-11-14 | 1987-05-26 | Nippon Hoso Kyokai <Nhk> | Color television signal processor |
| JPH01274582A (en) * | 1988-04-27 | 1989-11-02 | Pioneer Electron Corp | Transmission system for picture signal |
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