JPH035119B2 - - Google Patents
Info
- Publication number
- JPH035119B2 JPH035119B2 JP15602681A JP15602681A JPH035119B2 JP H035119 B2 JPH035119 B2 JP H035119B2 JP 15602681 A JP15602681 A JP 15602681A JP 15602681 A JP15602681 A JP 15602681A JP H035119 B2 JPH035119 B2 JP H035119B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- output
- chromaticity
- subtracter
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 230000001934 delay Effects 0.000 claims 1
- 230000002238 attenuated effect Effects 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
本発明は複合映像信号を輝度信号および色度信
号に分離する輝度・色度信号分離回路に関し、と
くに、くし形フイルタを用いながらドツト妨害や
垂直解像度の劣化を回避しうるようにしたもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a luminance/chromaticity signal separation circuit that separates a composite video signal into a luminance signal and a chromaticity signal, and in particular, uses a comb filter to avoid dot interference and deterioration of vertical resolution. It is made to be moisturized.
テレビジヨン受像機や一部のVTR（録画再生装
置）で高解像度を必要としない場合には、輝度信
号および色度信号をそれぞれローパスフイルタお
よびバンドパスフイルタを用いて取り出してい
る。そして、くし形フイルタを用いるのは、たか
だか色度信号から輝度信号の高域成分を取り除く
場合である。これに対し、高解像度の要請がある
ときには、輝度信号の高域も再生する必要がある
ため、それにさきだつて、輝度信号の高域に周波
数インターリーブされている色度信号をくし形フ
イルタで除去しなければならない。 When high resolution is not required for television receivers and some VTRs (recording/playback devices), the luminance signal and chromaticity signal are extracted using a low-pass filter and a band-pass filter, respectively. The comb filter is used only when high-frequency components of the luminance signal are removed from the chromaticity signal. On the other hand, when high resolution is required, it is necessary to also reproduce the high frequency range of the luminance signal, so first, the chromaticity signal that is frequency interleaved with the high frequency range of the luminance signal is removed using a comb filter. There must be.
ところで、くし形フイルタでは映像に垂直相関
が弱いときに色度信号によりドツト妨害が生じ、
また、垂直解像度も劣化してしまう。とくに、く
し形フイルタを用いたVTRでダビングを行う場
合には、画像の劣化が著しい。 By the way, with a comb filter, dot interference occurs due to chromaticity signals when the vertical correlation in the image is weak.
Moreover, the vertical resolution also deteriorates. In particular, when dubbing is performed using a VTR that uses a comb filter, the image quality deteriorates significantly.
また、輝度信号用のくし形フイルタは1H遅延
線として広帯域のものを必要とするため、構成が
複雑で、コストアツプを招来していた。 Furthermore, the comb filter for the luminance signal requires a wideband 1H delay line, resulting in a complex configuration and increased costs.
本発明はこのような事情を考慮してなされもの
であり、狭帯域の1H遅延線で済み、ドツト妨害
や垂直解像度の劣化のない輝度・色度信号分離回
路を提供することを目的としている。 The present invention has been made in consideration of these circumstances, and it is an object of the present invention to provide a luminance/chromaticity signal separation circuit that requires only a narrow-band 1H delay line and does not cause dot interference or deterioration of vertical resolution.
以下、本発明輝度・色度信号分離回路の一実施
例について図面を参照しながら説明しよう。 Hereinafter, one embodiment of the luminance/chromaticity signal separation circuit of the present invention will be described with reference to the drawings.
第１図において、１は映像信号入力端子を示
し、この映像信号入力端子１には複合映像信号
（第２図Ａ参照）を供給する。この映像信号は輝
度信号Ｙおよび色度信号Ｃからなる。そして、こ
の映像信号をバンドパスフイルタ２に供給して第
２図Ｂに示すように、輝度信号Ｙの高域成分Yh
および色度信号Ｃを得る。このバンドパスフイル
タ２の出力を位相等化器３で位相等化し、このの
ち1H運延線４を介して加算器５に供給する。ま
た、位相等化器３の出力を直接に加算器５に供給
する。この場合、色度信号Ｃに垂直相関があれ
ば、色度信号Ｃどうしが相殺して輝度信号Yhの
みを得ることができる。（第２図Ｃ参照）。 In FIG. 1, 1 indicates a video signal input terminal, and a composite video signal (see FIG. 2A) is supplied to this video signal input terminal 1. This video signal consists of a luminance signal Y and a chromaticity signal C. Then, this video signal is supplied to the bandpass filter 2, and as shown in FIG. 2B, the high frequency component Yh of the luminance signal Y is
and obtain a chromaticity signal C. The output of the bandpass filter 2 is phase equalized by a phase equalizer 3, and then supplied to an adder 5 via a 1H running line 4. Further, the output of the phase equalizer 3 is directly supplied to the adder 5. In this case, if the chromaticity signals C have a vertical correlation, the chromaticity signals C can cancel each other out to obtain only the luminance signal Yh. (See Figure 2C).
加算器５の出力を減算器６に供給し、この減算
器６には位相等化器３の出力をも供給する。この
場合、輝度信号Yhに垂直相関があれば、輝度信
号Yhどうしが相殺して色度信号Ｃのみを得るこ
とができる（第２図Ｄ参照）。そして、この減算
器６の出力を色度信号出力端子７を介して導出す
るとともに、他の減算器８に供給する。この減算
器８には前述の映像信号をも遅延線９を介して供
給し、この減算器８の出力を輝度信号出力端子１
０を介して導出する。この場合、遅延線９の遅延
量としては、バンドパスフイルタ２、位相等化器
３、加算器５および減算器６におけるそれぞれの
遅延量の和とする。減算器６の出力として色度信
号Ｃが得られれば、輝度信号出力端子１０からは
低域から高域にわたるすべての輝度信号Ｙを得る
ことができる（第２図Ｅ参照）。 The output of the adder 5 is supplied to a subtracter 6, which is also supplied with the output of the phase equalizer 3. In this case, if the luminance signals Yh have a vertical correlation, the luminance signals Yh can cancel each other out and only the chromaticity signal C can be obtained (see FIG. 2D). Then, the output of this subtracter 6 is derived via a chromaticity signal output terminal 7 and is supplied to another subtracter 8 . The above-mentioned video signal is also supplied to this subtracter 8 via a delay line 9, and the output of this subtracter 8 is sent to the luminance signal output terminal 1.
Derived via 0. In this case, the delay amount of the delay line 9 is the sum of the respective delay amounts in the bandpass filter 2, phase equalizer 3, adder 5, and subtracter 6. If the chromaticity signal C is obtained as the output of the subtracter 6, all the luminance signals Y ranging from low to high frequencies can be obtained from the luminance signal output terminal 10 (see FIG. 2E).
他方、オペアンプ11の非反転入力端子に位相等
化器３の出力を供給し、反転入力端子に1H遅延
線４の出力を他の1H遅延線１２を介して供給す
る。そしてオペアンプ11の出力をバンドパスフイ
ルタ１３を介してエンベローブ検波回路１４に供
給する。ここで、バンドパスフイルタ１３は
3.58MHzの色副搬送波周波数を中心とした特性を
有する。そして、このエンベロープ検波回路１４
の出力により可変抵抗型スイツチ１５のインピー
ダンスを制御する。この可変抵抗型スイツチ１５
は加算器５および減算器６の接続点と接地との間
に接続されるもので加算器５の出力の減衰量を制
御するものである。 On the other hand, the output of the phase equalizer 3 is supplied to the non-inverting input terminal of the operational amplifier 11, and the output of the 1H delay line 4 is supplied to the inverting input terminal via another 1H delay line 12. The output of the operational amplifier 11 is then supplied to an envelope detection circuit 14 via a bandpass filter 13. Here, the bandpass filter 13 is
It has characteristics centered around the color subcarrier frequency of 3.58MHz. And this envelope detection circuit 14
The impedance of the variable resistance switch 15 is controlled by the output of the variable resistance switch 15. This variable resistance switch 15
is connected between the connection point of the adder 5 and the subtracter 6 and the ground, and controls the amount of attenuation of the output of the adder 5.
この場合、色度信号Ｃのうち色副搬送波近傍の
成分に垂直相関性があると、エンベロープ検波回
路１４の出力は小となり、この結果、可変抵抗型
スイツチ１５のンピーダンスが大となる。このた
め、加算器５の出力は減衰させられずに、次段の
減算器６に供給される。他方、色度信号Ｃのうち
色副搬送波近傍の成分に垂直相関性がないと、エ
ンベロープ検波回路１４の出力が大となる。この
結果、可変抵抗型スイツチ１５のインピーダンス
が小となつて、加算器５の出力が減衰させられて
しまう。 In this case, if the components of the chromaticity signal C near the chrominance subcarrier have vertical correlation, the output of the envelope detection circuit 14 becomes small, and as a result, the impedance of the variable resistance switch 15 becomes large. Therefore, the output of the adder 5 is supplied to the subtracter 6 at the next stage without being attenuated. On the other hand, if the components of the chromaticity signal C near the chrominance subcarrier have no vertical correlation, the output of the envelope detection circuit 14 will be large. As a result, the impedance of the variable resistance switch 15 becomes small, and the output of the adder 5 is attenuated.
なお、映像信号のうちエネルギの集中している
のは、通常、色度信号Ｃの色副搬送波周辺および
輝度信号Ｙの低域部である。本例では、バンドパ
スフイルタ１３を設けて色度信号の垂直相関のみ
を監視するようにしている。 Note that the energy of the video signal is usually concentrated around the color subcarrier of the chromaticity signal C and in the low frequency region of the luminance signal Y. In this example, a bandpass filter 13 is provided to monitor only the vertical correlation of the chromaticity signals.
斯る構成において、映像信号の色度信号Ｃに垂
直相関があるときには、点Ｃにおいて第２図Ｃに
示す輝度信号Yhが得られる。このとき、エンベ
ロープ検出回路１４の出力は小であり、この結
果、可変抵抗型スイツチ１５のインピーダンスが
大となつている。したがつて、点Ｃの輝度信号
Yhはそのまま減衰させられることなく次段の減
算器６に供給される。そうすると、この減算器６
の出力として第２図Ｄに示す色度信号Ｃが得ら
れ、この色度信号Ｃが色度信号出力端子７を介し
て導出される。 In such a configuration, when the chromaticity signal C of the video signal has a vertical correlation, a luminance signal Y h shown in FIG. 2C is obtained at point C. At this time, the output of the envelope detection circuit 14 is small, and as a result, the impedance of the variable resistance switch 15 is large. Therefore, the luminance signal at point C
Y h is supplied as is to the subtracter 6 at the next stage without being attenuated. Then, this subtractor 6
The chromaticity signal C shown in FIG. 2D is obtained as an output, and this chromaticity signal C is derived via the chromaticity signal output terminal 7.
他方、この色度信号Ｃが減算器８において映像
信号に減算されるので、輝度信号出力端子１０か
らは、高域の抑圧されていない輝度信号Ｙが導出
される。 On the other hand, since this chromaticity signal C is subtracted from the video signal in the subtracter 8, a luminance signal Y whose high frequency is not suppressed is derived from the luminance signal output terminal 10.
他方、映像信号の色度信号Ｃに垂直相関がない
ときには、エンベロープ検波回路１４の出力は小
であり、この結果、可変抵抗型スイツチ１５のイ
ンピーダンスが小となつている。このため、加算
器５の出力は減衰させられてほとんど減算器６に
は供給されない。したがつて、この減算器６の出
力として輝度信号Ｙの高域成分Yhおよび色度信
号Ｃが得られる。そして、この輝度信号の高域成
分Yhおよび色度信号Ｃが色度信号出力端子７か
ら導出される。この場合、輝度信号Ｙの高域成分
Yhのエネルギが小さいことを考えれば、色度信
号Ｃのみが色度信号出力端子７から導出されると
考えられる。また、減算器８の出力としては輝度
信号Ｙの低域成分Ylが得られ、これが輝度信号
出力端子１０から導出される。 On the other hand, when there is no vertical correlation in the chromaticity signal C of the video signal, the output of the envelope detection circuit 14 is small, and as a result, the impedance of the variable resistance switch 15 is small. Therefore, the output of the adder 5 is attenuated and is hardly supplied to the subtracter 6. Therefore, the high frequency component Y h of the luminance signal Y and the chromaticity signal C are obtained as the output of the subtracter 6. Then, the high frequency component Y h of this luminance signal and the chromaticity signal C are derived from the chromaticity signal output terminal 7. In this case, the high frequency component of the luminance signal Y
Considering that the energy of Y h is small, it is considered that only the chromaticity signal C is derived from the chromaticity signal output terminal 7. Further, a low frequency component Yl of the luminance signal Y is obtained as an output of the subtracter 8, and this is derived from the luminance signal output terminal 10.
なお、この場合、輝度信号Ｙの高域成分Yhが
減算器８で相殺されてしまうので、この高域成分
Yhにエネルギが集中している場合には忠実な高
解像度の再生を行えない。しかし、色度信号Ｃの
無相関な場合は瞬時であり、通常の場合には人間
の目の積分効果により、映像の劣化をともなうま
でにいたらない。 In this case, since the high frequency component Y h of the luminance signal Y is canceled out by the subtractor 8, this high frequency component
If energy is concentrated in Y h , faithful high-resolution playback cannot be performed. However, when the chromaticity signal C is uncorrelated, it is instantaneous, and normally it does not cause image deterioration due to the integration effect of the human eye.
以上述べたように、映像信号の垂直相関を検出
し、この垂直相関が弱いときにはくし形フイルタ
からの出力を抑圧するようにしている。したがつ
て、垂直相関が弱いときに生じるドツト妨害や垂
直解像度の劣化を防止できる。 As described above, the vertical correlation of the video signal is detected, and when this vertical correlation is weak, the output from the comb filter is suppressed. Therefore, it is possible to prevent dot interference and deterioration of vertical resolution that occur when vertical correlation is weak.
また、本例では映像信号から色度信号を引算し
て輝度信号を得るようにしている。すなわち、直
接くし形フイルタを用いて輝度信号のすべての帯
域成分を形成していない。したがつて、広帯域の
1H運延線が不要となり、コストダウンを実現し
うる。 Further, in this example, a luminance signal is obtained by subtracting a chromaticity signal from a video signal. That is, all band components of the luminance signal are not formed directly using a comb filter. Therefore, broadband
This eliminates the need for 1H running lines, which can reduce costs.
なお、本発明は上述実施例に限定されるもので
はなく、その要旨を逸脱しない範囲で種々の構成
を採りうることはもちろんである。 It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations may be adopted without departing from the scope of the invention.
第１図は本発明輝度・色度信号分離回路の一実
施例を示すブロツク図、第２図は第１図の各点の
信号のスペクトラムをそれぞれ示すグラフであ
る。
２はバンドパスフイルタ、４はくし形フイルタ
をなす1H遅延線、１１は色度信号の垂直相関性
を検出するオペアンプである。
FIG. 1 is a block diagram showing an embodiment of the luminance/chromaticity signal separation circuit of the present invention, and FIG. 2 is a graph showing the spectrum of the signal at each point in FIG. 1. 2 is a bandpass filter, 4 is a 1H delay line forming a comb filter, and 11 is an operational amplifier for detecting the vertical correlation of the chromaticity signal.
Claims (1)
と、このフイルタの出力信号を１水平走査期間遅
延させる遅延回路と、 この遅延回路の出力信号と上記フイルタの出力
信号とを加算する加算器と、 上記フイルタの出力信号の垂直相関の有無を検
出する相関検出器と、 この相関検出器の検出信号に基いて上記加算器
の出力信号のレベルを制御するレベル制御器と、 このレベル制御器の出力信号と上記フイルタの
出力信号とを減算する第１の減算器と、 この第１の減算器の出力信号と上記複合映像信
号とを減算する第２の減算器を備え、 上記第１の減算器から色度信号を得ると共に、
上記第２の減算器から輝度信号を得るようにな
し、 上記フイルタの出力信号が非相関のときに上記
レベル制御器は上記加算器の出力信号のレベルを
低減するようにしたことを特徴とする輝度・色度
信号分離回路。[Claims] 1. A filter that separates high-frequency components of a composite video signal, a delay circuit that delays the output signal of this filter by one horizontal scanning period, and an output signal of this delay circuit and an output signal of the filter. an adder that performs addition; a correlation detector that detects the presence or absence of vertical correlation between the output signals of the filter; and a level controller that controls the level of the output signal of the adder based on the detection signal of the correlation detector; a first subtracter that subtracts the output signal of the level controller and the output signal of the filter; and a second subtracter that subtracts the output signal of the first subtracter and the composite video signal; Obtaining a chromaticity signal from the first subtractor, and
A luminance signal is obtained from the second subtracter, and the level controller reduces the level of the output signal of the adder when the output signals of the filter are uncorrelated. Luminance/chromaticity signal separation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15602681A JPS5857881A (en) | 1981-09-30 | 1981-09-30 | Separating circuit for luminance and chroma signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15602681A JPS5857881A (en) | 1981-09-30 | 1981-09-30 | Separating circuit for luminance and chroma signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5857881A JPS5857881A (en) | 1983-04-06 |
| JPH035119B2 true JPH035119B2 (en) | 1991-01-24 |
Family
ID=15618683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15602681A Granted JPS5857881A (en) | 1981-09-30 | 1981-09-30 | Separating circuit for luminance and chroma signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5857881A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4636842A (en) * | 1984-11-29 | 1987-01-13 | Rca Corporation | Comb filter "hanging dot" eliminator |
| JPH06105984B2 (en) * | 1985-12-17 | 1994-12-21 | パイオニア株式会社 | Y-C separation circuit |
| JPS62152290A (en) * | 1985-12-26 | 1987-07-07 | Matsushita Electric Ind Co Ltd | Luminance signal and chrominance signal separating circuit |
| JPS62271563A (en) * | 1986-05-20 | 1987-11-25 | Matsushita Electric Ind Co Ltd | Noise removing device |
| JP2626746B2 (en) * | 1986-09-19 | 1997-07-02 | 日本ビクター株式会社 | Color video signal processing circuit |
| JPH06105981B2 (en) * | 1986-10-08 | 1994-12-21 | 日本ビクター株式会社 | Color video signal processing circuit |
| JPH03263977A (en) * | 1989-11-27 | 1991-11-25 | Hitachi Ltd | Television receiver |
| JP3006850B2 (en) * | 1990-05-29 | 2000-02-07 | 松下電器産業株式会社 | Comb filter |
| AU700145B2 (en) * | 1991-11-15 | 1998-12-24 | Snell & Wilcox Limited | Colour television signal processing |
| JP3260880B2 (en) * | 1993-01-26 | 2002-02-25 | トウシバビデオプロダクツ プライベート リミテッド | Luminance signal / color signal separation circuit |
-
1981
- 1981-09-30 JP JP15602681A patent/JPS5857881A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5857881A (en) | 1983-04-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4223340A (en) | Image detail improvement in a vertical detail enhancement system | |
| GB2112246A (en) | Carrier colour signal processing circuits | |
| JPS628994B2 (en) | ||
| JPH035119B2 (en) | ||
| EP0618738B1 (en) | Comb filter capable of reducing cross-color phenomena and noises | |
| JPH05115072A (en) | Correlation adapting type luminance/color-signal separating circuit | |
| JPS6119198B2 (en) | ||
| JP3260880B2 (en) | Luminance signal / color signal separation circuit | |
| US4750033A (en) | Comb filter, chrominance and luminance signal separating circuit for modifying the level-frequency characteristic of the luminance signal | |
| KR0178382B1 (en) | Luminance signal/color signal separating circuit and noise reduction circuit using a comb filter | |
| US4807049A (en) | C-type comb filter with negative feedback | |
| JP2666290B2 (en) | Video signal recording / reproducing device | |
| US5151792A (en) | Video signal reproducing apparatus with means for producing a crosstalk eliminated luminance output signal | |
| JPH02186787A (en) | Y/c separation circuit | |
| JPS6139792B2 (en) | ||
| JP3240711B2 (en) | Y / C separation filter device | |
| JP2722447B2 (en) | Magnetic recording / reproducing device | |
| JP3427271B2 (en) | Video signal processing circuit | |
| JP2609657B2 (en) | Television receiver | |
| JP3507987B2 (en) | Video signal processing circuit | |
| JPH04320194A (en) | Video signal processing circuit and video signal recording and reproducing device | |
| JPS62125792A (en) | Comb-line filter for y/c separation | |
| JPH0258837B2 (en) | ||
| JPH0797870B2 (en) | Luminance signal processing device of video signal recording / reproducing device | |
| JPH02141187A (en) | Y/c separation circuit |