JPH05137154A - Y/c separating circuit for video signal - Google Patents
Y/c separating circuit for video signalInfo
- Publication number
- JPH05137154A JPH05137154A JP29555791A JP29555791A JPH05137154A JP H05137154 A JPH05137154 A JP H05137154A JP 29555791 A JP29555791 A JP 29555791A JP 29555791 A JP29555791 A JP 29555791A JP H05137154 A JPH05137154 A JP H05137154A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- color signal
- saturation
- luminance signal
- degree
- 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.)
- Granted
Links
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- Processing Of Color Television Signals (AREA)
Abstract
Description
【０００１】この発明は、映像信号のＹ／Ｃ分離回路に
関するものである。The present invention relates to a video signal Y / C separation circuit.
【０００２】[0002]
【従来の技術】図４は従来の１水平遅延素子を２個使用
したＮＴＳＣ方式の映像信号のＹ／Ｃ分離回路の構成を
示し、１はＴＶ信号等の複合映像信号の入力端子、２，
３は１水平期間遅延する遅延素子、４は色信号を抽出す
る垂直バンドパスフィルタを構成するため、入力された
複合映像信号に遅延素子２，３の出力を加算する加算回
路、５は加算回路４により抽出された色信号を水平周波
数領域において帯域制限するバンドパスフィルタ、６は
遅延素子２の出力をバンドパスフィルタ５の遅延時間と
時間合せするために遅延する遅延素子、７は輝度信号を
得るために遅延素子６の出力の複合映像信号からバンド
パスフィルタ５の出力の色信号を減算する減算回路、８
は輝度信号の出力端子、９は色信号出力端子である。2. Description of the Related Art FIG. 4 shows the construction of a conventional Y / C separation circuit for an NTSC video signal using two horizontal delay elements, where 1 is an input terminal for a composite video signal such as a TV signal, and 2,
3 is a delay element for delaying one horizontal period, 4 is a vertical bandpass filter for extracting a color signal, and therefore, an adder circuit for adding the outputs of the delay elements 2, 3 to the input composite video signal, 5 is an adder circuit A bandpass filter for band-limiting the chrominance signal extracted by 4 in the horizontal frequency domain, 6 a delay element for delaying the output of the delay element 2 to match the delay time of the bandpass filter 5, and 7 a luminance signal. A subtraction circuit for subtracting the color signal output from the bandpass filter 5 from the composite video signal output from the delay element 6 to obtain 8
Is a luminance signal output terminal, and 9 is a color signal output terminal.
【０００３】次に、動作について説明する。入力端子１
から入力された複合映像信号は１水平遅延素子２，３に
シリーズに入力される。入力された複合映像信号、１水
平遅延素子２，３の出力はそれぞれ−１／４，１／２，
−１／４の割合で加算回路４により加算され、これによ
りトランスバーサルフィルタを構成し、くし型フィルタ
となって色信号を抽出する。Next, the operation will be described. Input terminal 1
The composite video signal input from is input to one horizontal delay element 2 and 3 in series. The input composite video signal, the outputs of the horizontal delay elements 2 and 3 are -1/4, 1/2, and
Addition is performed by the addition circuit 4 at a rate of -1/4, thereby forming a transversal filter and forming a comb filter to extract color signals.
【０００４】抽出された色信号は複合映像信号のすべて
の帯域にわたりくし特性を有しており、この特性のまま
複合映像信号から色信号を減算して輝度信号を抽出する
と、図６のようにドット妨害等のない輝度信号と色信号
に分離されるが、輝度信号は低域の斜め成分が欠落し、
ボケた映像となる。従って、加算器４から出力された色
信号を水平周波数領域のバンドパスフィルタ５により帯
域制限することにより、低域の斜め成分の劣化を抑制す
る。The extracted chrominance signal has a comb characteristic over the entire band of the composite video signal. When the luminance signal is extracted by subtracting the chrominance signal from the composite video signal with this characteristic, as shown in FIG. Although it is separated into a luminance signal and a color signal without dot interference, the luminance signal lacks the diagonal component in the low range,
It will be a blurred image. Therefore, the color signal output from the adder 4 is band-limited by the band-pass filter 5 in the horizontal frequency domain to suppress the deterioration of the diagonal component in the low frequency range.
【０００５】図５にバンドパスフィルタ５の特性図を示
す。バンドパスフィルタ５の帯域をロのように狭くすれ
ば斜め解像度は向上するが、図７に示すように色信号の
帯域が狭くなり、色信号立上り等のトランジェントにお
いて輝度信号成分に残留色信号が残り、ドット妨害が生
じた。又、バンドパスフィルタ５の特性を図５のイのよ
うにすれば、輝度信号と色信号は図８に示すようにな
る。従って、斜め方向の解像度と色信号の水平非相関部
のドット妨害とは相反関係にある。一方、１水平遅延素
子２から出力された複合映像信号は遅延素子６によりバ
ンドパスフィルタ５の出力の遅延時間だけ遅延され、遅
延素子６の出力からバンドパスフィルタ５の出力が減算
回路７により減算されて輝度信号が出力端子８から出力
される。又、バンドパスフィルタ５の出力は色信号とし
て出力端子９から出力される。FIG. 5 shows a characteristic diagram of the bandpass filter 5. If the band of the bandpass filter 5 is narrowed as shown in (b), the diagonal resolution is improved, but the band of the chrominance signal is narrowed as shown in FIG. Remaining dot interference occurred. If the characteristics of the bandpass filter 5 are set as shown in FIG. 5B, the luminance signal and the color signal are as shown in FIG. Therefore, there is a reciprocal relationship between the diagonal resolution and the dot interference in the horizontal non-correlation part of the color signal. On the other hand, the composite video signal output from the 1 horizontal delay element 2 is delayed by the delay element 6 by the delay time of the output of the bandpass filter 5, and the output of the bandpass filter 5 is subtracted from the output of the delay element 6 by the subtraction circuit 7. Then, the luminance signal is output from the output terminal 8. The output of the bandpass filter 5 is output from the output terminal 9 as a color signal.
【０００６】[0006]
【発明が解決しようとする課題】従来のＹ／Ｃ分離回路
は上記のように構成され、輝度信号の斜め解像度と色信
号の水平非相関部のドット妨害とは相反関係にあり、一
方を良好にすると他方が悪化するという課題があった。The conventional Y / C separation circuit is constructed as described above, and there is a reciprocal relation between the diagonal resolution of the luminance signal and the dot interference of the horizontal non-correlation part of the color signal, and one of them is good. However, there was a problem that the other would get worse.
【０００７】この発明は上記のような課題を解決するた
めに成されたものであり、色信号の水平非相関部のドッ
ト妨害を抑制し、輝度信号の斜め解像度を向上すること
ができる映像信号のＹ／Ｃ分離回路を得ることを目的と
する。The present invention has been made to solve the above problems, and it is possible to suppress dot interference in the horizontal non-correlation part of a color signal and improve the diagonal resolution of a luminance signal. The purpose is to obtain a Y / C separation circuit of.
【０００８】[0008]
【課題を解決するための手段】この発明に係る映像信号
のＹ／Ｃ分離回路は、映像信号を輝度信号と色信号に分
離する手段と、色信号の高域成分を抽出するフィルタ
と、色信号を検波してその飽和度を検出する検波手段
と、色信号の高域成分を色信号の飽和度に応じた増幅度
で増幅する増幅手段と、増幅手段の出力を輝度信号に加
算する加算手段を設けたものである。A video signal Y / C separation circuit according to the present invention comprises means for separating a video signal into a luminance signal and a color signal, a filter for extracting a high frequency component of the color signal, and a color signal. Detection means for detecting the signal and detecting its saturation, amplification means for amplifying the high frequency component of the color signal with an amplification degree according to the saturation degree of the color signal, and addition for adding the output of the amplification means to the luminance signal Means are provided.
【０００９】この発明においては、映像信号が輝度信号
と色信号に分離され、この色信号の高域成分が抽出され
るとともに色信号の飽和度が検出され、この高域成分が
この飽和度に応じた増幅度で増幅されて輝度信号に加算
され、色信号の高い飽和度の部分ではドット妨害が少な
くなり、飽和度が低い部分では斜め方向の解像度が向上
する。According to the present invention, the video signal is separated into the luminance signal and the color signal, the high frequency component of this color signal is extracted, and the saturation of the color signal is detected. It is amplified with a corresponding amplification degree and added to the luminance signal, so that dot interference is reduced in a portion of the color signal having a high degree of saturation, and diagonal resolution is improved in a portion having a low degree of saturation.
【００１０】[0010]
【実施例】以下、この発明の実施例を図面とともに説明
する。図１はこの実施例による構成を示し、１０は色信
号の高域成分を抽出するバンドエルミネートフィルタ
（以下ＢＥＦと略する。）、１１は色信号の飽和度を検
出する検波回路、１２はＢＥＦ１０により抽出した色信
号の高域成分の増幅度を検波回路１１の検波電圧により
変化させて増幅する電圧制御増幅回路（以下、ＶＣＡと
略する。）、１３は減算器７から出力される輝度信号を
ＶＣＡ１２から出力される色信号の高域成分と時間合せ
する遅延素子、１４は遅延素子１３から出力される輝度
信号とＶＣＡ１２から出力される色信号の高域成分を加
算する加算回路である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration according to this embodiment, 10 is a band erasing filter (hereinafter abbreviated as BEF) for extracting high frequency components of a color signal, 11 is a detection circuit for detecting saturation of the color signal, and 12 is a detection circuit. A voltage control amplifier circuit (hereinafter, abbreviated as VCA) 13 for changing and amplifying the amplification degree of the high frequency component of the color signal extracted by the BEF 10 by the detection voltage of the detection circuit 11, 13 is the brightness output from the subtractor 7. A delay element that time-matches the signal with the high-frequency component of the color signal output from the VCA 12, and 14 is an adder circuit that adds the luminance signal output from the delay element 13 and the high-frequency component of the color signal output from the VCA 12. ..
【００１１】以下、動作について説明する。符号１〜９
で示す部分は従来と同様であるが、ＢＰＦ５は図２に示
すように帯域が広いものを使用し、色信号の水平非相関
部のドット妨害の発生を抑えるようにした。図３は１０
０％掃引信号を入力したときの各部の動作波形を示し、
図３（ａ）は減算器７から出力される輝度信号の周波数
特性を示し、図３（ｂ）はＢＰＦ５から出力される色信
号の周波数特性を示す。この色信号を図２の特性を有す
るＢＥＦ１０に入力し、色信号の高域成分を抽出する。The operation will be described below. Reference numbers 1 to 9
Although the part indicated by is the same as the conventional one, the BPF 5 having a wide band as shown in FIG. 2 is used to suppress the occurrence of dot interference in the horizontal non-correlation part of the color signal. FIG. 3 shows 10
Shows the operation waveforms of each part when a 0% sweep signal is input,
3A shows the frequency characteristic of the luminance signal output from the subtractor 7, and FIG. 3B shows the frequency characteristic of the color signal output from the BPF 5. This color signal is input to the BEF 10 having the characteristics shown in FIG. 2, and the high frequency component of the color signal is extracted.
【００１２】この抽出された成分には、色信号の高域成
分のみならず、輝度信号の斜め成分の高域成分も含まれ
ており、この信号をＶＣＡ１２に入力する。一方、色信
号を検波回路１１にも入力し、図３（ｃ）に示す色信号
の検波波形を取り出す。この色信号の飽和度を示す検波
波形をＶＣＡ１２に入力し、ＢＥＦ１０の出力信号をこ
の飽和度に応じた増幅度で増幅する。従って、飽和度の
高い部分では増幅度が大きくなり、飽和度が低い部分で
は増幅度が小さくなり、ＶＣＡ１２の出力は図３（ｄ）
に示すような波形となる。The extracted components include not only the high frequency component of the color signal but also the high frequency component of the oblique component of the luminance signal, and this signal is input to the VCA 12. On the other hand, the color signal is also input to the detection circuit 11, and the detection waveform of the color signal shown in FIG. A detection waveform indicating the saturation of this color signal is input to the VCA 12, and the output signal of the BEF 10 is amplified by the amplification degree according to this saturation. Therefore, the amplification degree becomes large in the high saturation portion and becomes small in the low saturation portion, and the output of the VCA 12 is shown in FIG.
The waveform is as shown in.
【００１３】次に、ＶＣＡ１２の出力と遅延素子１３に
より時間合せされた輝度信号とが加算器１４により加算
され、輝度信号の周波数特性は図３（ｅ）に示すように
くし特性が従来と比べて狭くなった特性となる。ここ
で、飽和度が高い信号はドット妨害が大きく発生して視
覚的に見えやすく、飽和度が低い信号はドット妨害が見
えにくい。従って、上記したように、飽和度の高い部分
ではドット妨害を抑圧し、飽和度が低い部分では斜め解
像度が向上した輝度信号が得られ、視覚特性に準じた良
好なＹ／Ｃ分離を行なうことができる。Next, the output of the VCA 12 and the luminance signal timed by the delay element 13 are added by the adder 14, and the frequency characteristic of the luminance signal has a comb characteristic as compared with the conventional one as shown in FIG. It becomes a narrowed characteristic. Here, a signal with a high degree of saturation causes a large amount of dot interference to be easily visible, and a signal with a low degree of saturation is less likely to see a dot interference. Therefore, as described above, the dot interference is suppressed in the high saturation part, and the luminance signal with the improved diagonal resolution is obtained in the low saturation part, and the good Y / C separation according to the visual characteristics is performed. You can
【００１４】[0014]
【発明の効果】以上のようにこの発明によれば、色信号
の飽和度が高い場合ではドット妨害を抑制することがで
きるとともに、飽和度が低い部分では輝度信号の斜め方
向の解像度を向上することができ、視覚的に良好な画像
を得ることができる。As described above, according to the present invention, dot interference can be suppressed when the saturation of the color signal is high, and the diagonal resolution of the luminance signal is improved in the portion where the saturation is low. It is possible to obtain a visually good image.
【図１】この発明によるＹ／Ｃ分離回路の構成図であ
る。FIG. 1 is a configuration diagram of a Y / C separation circuit according to the present invention.
【図２】この発明によるＢＰＦ、ＢＥＦの周波数特性図
である。FIG. 2 is a frequency characteristic diagram of BPF and BEF according to the present invention.
【図３】この発明によるＹ／Ｃ分離回路の各部の動作波
形図である。FIG. 3 is an operation waveform diagram of each part of the Y / C separation circuit according to the present invention.
【図４】従来のＹ／Ｃ分離回路の構成図である。FIG. 4 is a configuration diagram of a conventional Y / C separation circuit.
【図５】ＢＰＦの周波数特性図である。FIG. 5 is a frequency characteristic diagram of BPF.
【図６】従来のＹ／Ｃ分離回路におけるＢＰＦを設けな
い場合の入出力波形図である。FIG. 6 is an input / output waveform diagram when a BPF is not provided in the conventional Y / C separation circuit.
【図７】従来のＹ／Ｃ分離回路の出力波形図である。FIG. 7 is an output waveform diagram of a conventional Y / C separation circuit.
【図８】従来のＹ／Ｃ分離回路の出力波形図である。FIG. 8 is an output waveform diagram of a conventional Y / C separation circuit.
２，３ １水平期間遅延素子 ４，１４ 加算回路 ５ バンドパスフィルタ ６，１３ 遅延素子 ７ 減算回路 １０ バンドエルミネートフィルタ １１ 検波回路 １２ 電圧制御増幅回路 2,3 1 Horizontal period delay element 4,14 Adder circuit 5 Band pass filter 6,13 Delay element 7 Subtractor circuit 10 Band elimination filter 11 Detection circuit 12 Voltage control amplifier circuit
Claims (1)
信号と色信号に分離する手段と、色信号の高域成分を抽
出するフィルタと、色信号を検波してその飽和度を検出
する検波手段と、抽出された色信号の高域成分を色信号
の飽和度に応じた増幅度で増幅する増幅手段と、増幅手
段の出力を輝度信号に加算する加算手段を備えたことを
特徴とする映像信号のＹ／Ｃ分離回路。1. A means for separating a video signal into a luminance signal and a chrominance signal by utilizing its vertical correlation, a filter for extracting a high frequency component of the chrominance signal, and detecting the saturation level by detecting the chrominance signal. A detection means, an amplification means for amplifying the high frequency component of the extracted color signal with an amplification degree according to the saturation of the color signal, and an addition means for adding the output of the amplification means to the luminance signal. Y / C separation circuit for video signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3295557A JP2600544B2 (en) | 1991-11-12 | 1991-11-12 | Y / C separation device for video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3295557A JP2600544B2 (en) | 1991-11-12 | 1991-11-12 | Y / C separation device for video signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05137154A true JPH05137154A (en) | 1993-06-01 |
| JP2600544B2 JP2600544B2 (en) | 1997-04-16 |
Family
ID=17822184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3295557A Expired - Lifetime JP2600544B2 (en) | 1991-11-12 | 1991-11-12 | Y / C separation device for video signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2600544B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008011398A (en) * | 2006-06-30 | 2008-01-17 | Toshiba Corp | Luminance signal/carrier chrominance signal separating circuit, and method |
| JP2008098917A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Signal separator |
| JP2008098918A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Signal separator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01136492A (en) * | 1987-11-24 | 1989-05-29 | Victor Co Of Japan Ltd | Video signal processor |
| JPH01318485A (en) * | 1988-06-20 | 1989-12-22 | Hitachi Ltd | Comb line filter |
| JPH02100508A (en) * | 1988-10-07 | 1990-04-12 | Sony Corp | Y/c separation filter |
-
1991
- 1991-11-12 JP JP3295557A patent/JP2600544B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01136492A (en) * | 1987-11-24 | 1989-05-29 | Victor Co Of Japan Ltd | Video signal processor |
| JPH01318485A (en) * | 1988-06-20 | 1989-12-22 | Hitachi Ltd | Comb line filter |
| JPH02100508A (en) * | 1988-10-07 | 1990-04-12 | Sony Corp | Y/c separation filter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008011398A (en) * | 2006-06-30 | 2008-01-17 | Toshiba Corp | Luminance signal/carrier chrominance signal separating circuit, and method |
| JP2008098917A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Signal separator |
| JP2008098918A (en) * | 2006-10-11 | 2008-04-24 | Denso Corp | Signal separator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2600544B2 (en) | 1997-04-16 |
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