JPH0573112B2 - - Google Patents
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- Publication number
- JPH0573112B2 JPH0573112B2 JP60198959A JP19895985A JPH0573112B2 JP H0573112 B2 JPH0573112 B2 JP H0573112B2 JP 60198959 A JP60198959 A JP 60198959A JP 19895985 A JP19895985 A JP 19895985A JP H0573112 B2 JPH0573112 B2 JP H0573112B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- coefficient
- carrier color
- signal
- vertical correlation
- 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 - Lifetime
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- 238000001514 detection method Methods 0.000 claims description 39
- 239000002131 composite material Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
Landscapes
- Processing Of Color Television Signals (AREA)
- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Description
産業上の利用分野
本発明は搬送色信号処理回路に係り、帰還形く
し形フイルタにて搬送色信号のノイズ成分を低減
する回路に関する。
従来の技術
第２図は一般の映像信号再生装置の一例を
VTRに適用したブロツク系統図を示す。なお、
同図中、破線で示すＣ垂直相関信号検出回路２４
は本発明回路にて付加される部分である。同図に
おいて、磁気テープ１から磁気ヘツド２にて再生
された映像信号はプリアンプ３を介して高域フイ
ルタ（HPF）４に供給されてここで輝度信号を
分離され、再生輝度信号処理回路５を介してＨ相
関信号検出回路６に供給され、非Ｈ相関の場合検
出信号が取出される。
一方、プリアンプ３の出力は低域フイルタ
（LPF）７に供給されてここで搬送色信号を分離
され、搬送色信号処理回路８を介して帰還形くし
形フイルタにて構成されるノイズ低減回路９に供
給される。ノイズ低減回路９ではＨ相関検出回路
６の出力信号による制御信号にて帰還量を制御さ
れ、搬送色信号に含まれるノイズ成分を低減す
る。ノイズ成分を低減された搬送色信号及び再生
輝度信号処理回路５からの輝度信号は混合回路１
０にて混合され、出力端子１１より取出される。
ここで、搬送色信号に含まれるノイズ成分を低
減する手段として帰還形くし形フイルタが用いら
れるが、これは非帰還形くし形フイルタに比して
SN比改善度が優れている。然るに、垂直方向の
解像度が劣化する（垂直色にじみ）欠点を有して
いるので、輝度信号の非Ｈ相関信号を用いてその
改善を図つている。
第３図は第２図示のＨ相関信号検出回路６及び
ノイズ低減回路９にて構成される本出願人が先に
特願昭59−247538号にて提案した搬送色信号再生
装置の基本的ブロツク系統図を示す。同図におい
て、端子１２に入来した搬送色信号Ｃ（3.58MHz）
は、減算器１３、1H（Ｈは水平走査期間）遅延回
路（1HDLY）１４、加算器１５、リミツタ１
７、係数回路（VCA、電圧制御増幅器）１６に
て構成される帰還形くし形フイルタによつてノイ
ズ成分を低減され、出力端子１８より取出され
る。一方、端子１９に入来した輝度信号Ｙは
1HLDY２０、減算器２１、検出器２２にて構成
されるＹ垂直相関検出回路２３により垂直相関有
無の検出信号とされ、係数回路１６に供給されて
係数Ｋを制御する。
ここで輝度信号に相関がない場合、端子１９に
入来する輝度信号はＹ垂直相関検出回路２３にて
非垂直相関信号とされる。
この場合、係数回路１６の係数は非垂直相関信
号にて垂直相関時よりも小になるように制御さ
れ、従つて、このフイルタは実質的に非帰還形く
し形フイルタとして動作し、これにより、搬送色
信号が垂直色にじみ少なく取出される。
一方、輝度信号と相関がある場合、Ｙ垂直相関
検出回路２３からは垂直相関信号が取出され、係
数回路１６の係数Ｋはそのままとされる。
加算器１５の出力よりノイズ成分を含まれた搬
送色信号の垂直輪郭信号が取出され、この信号は
リミツタ１７にて最大振幅の10％のリミツタレベ
ルＳ（≪１）で振幅制限され、係数回路１６にて
係数Ｋを乗じられる。つまり、帰還ループの帰還
係数K0はＫ・Ｓとなり、従来装置のそれに比し
て小とされる。これにより、従来装置による帰還
ループ信号に比してその振幅を小にし得る。
この帰還ループ信号は減算器１３にて搬送色信
号から減算されて出力端子１８より取出される。
この場合も搬送色信号の色にじみを従来装置に比
して小にでき、画質を向上し得る。
これは、リミツタ１７によつて帰還係数がＫか
らＫ・Ｓと非常に小さくされ、帰還形くし形フイ
ルタ（垂直方向の低減フイルタ）の遮断周波数が
高くされて信号に対する追従性が向上するためで
ある。
本発明が解決しようとする問題点
上記提案になる回路は、特に、搬送色信号と輝
度信号とに相関がない場合、リミツタ１７により
帰還係数を小にして垂直色にじみを少なくすると
共に、SN比を改善しているが、特にリミツタ１
７のリミツタレベル以上のノイズが発生した場合
などこの垂直色にじみを確実になくすことができ
ず、又、SN比の改善にも限度がある問題点があ
つた。
本発明は、搬送色信号と輝度信号とに相関がな
い場合でも垂直色にじみを確実になくし得ると共
に、よりSN比を高くとり得る搬送色信号処理回
路を提供することを目的とする。
問題点を解決するための手段
上述した問題点を解決するために本発明は、
nH遅延回路（ｎは１又は２、Ｈは水平走査期間）
１４、該nH遅延回路１４の入力側及び出力側に
夫々設けられた第１及び第２の係数回路３０，３
１、入力端子１２から供給される搬送色信号と該
第２の係数回路３１からの出力信号とを合成して
得た合成信号を該第１の係数回路３０を介して出
力端子１８に出力する合成回路２９にて構成され
る帰還形フイルタ２８と、
前記入力端子１２から供給される搬送色信号と
前記第２の係数回路３１から出力信号とを合成し
た合成信号に応じて搬送色信号の垂直相関を検出
するＣ垂直相関検出回路２４と、
輝度信号の垂直相関を検出するＹ垂直相関検出
回路２３及び該Ｃ垂直相関検出回路２４からの
夫々の検出信号に応じて前記第１及び第２の係数
回路３０，３１の夫々の係数を可変制御する制御
回路２７とよりなる構成とする。
作 用
Ｙ垂直相関検出回路２３及びＣ垂直相関検出回
路２４の夫々の検出信号により帰還形フイルタ２
８に設けられた第１及び第２の係数回路３０，３
１の夫々の係数A1，A2を可変制御する。
実施例
第１図は本発明回路の一実施例のブロツク系統
図を示し、同図中、第３図と同一構成部分には同
一番号を付してその説明を省略する。同図中、２
４はＣ垂直相関検出回路で、合成回路２５、検出
器２６にて構成されており、端子１２に入来する
搬送色信号の垂直相関の有無を検出し、検出信号
を制御回路２７に供給する。上記した合成回路２
５は、第１図に示すように、端子１２に入来する
搬送色信号と係数回路３１から供給される搬送色
信号とを合成して得た合成信号を検出器２６に出
力するものであり、同相の搬送色信号が係数回路
３１から供給された場合これは加算回路として働
き、また、逆相の搬送色信号が係数回路３１から
供給された場合減算回路として働くものである。
これと同様に、Ｙ垂直相関検出回路２３からの検
出信号も制御回路２７に供給される。検出器２
２，２６は、ここに入力される信号をある閾値と
比較し、例えば垂直相関有無の２つの状態の検出
信号を出力する構成とされている。
２８は帰還形くし形フイルタで、合成回路２
９、係数A1を設定された係数回路（VCA）３
０、1H遅延回路１４、係数A2を設定された係数
回路（VCA）３１にて構成されており、係数回
路３０，３１の夫々の係数A1，A2は後述の如く、
制御回路２７からの制御信号にて適宜可変設定さ
れる構成とされている。上記した合成回路２９
は、第１図に示すように、端子１２に入来する搬
送色信号と係数回路３１から供給される搬送色信
号とを合成して得た合成信号を係数回路３０に出
力するものであり、同相の搬送色信号が係数回路
３１から供給された場合これは加算回路として働
き、また、逆相の搬送色信号が係数回路３０から
供給された場合減算回路として働くものである。
制御回路２７は、Ｙ垂直相関検出回路２３及び
Ｃ垂直相関検出回路２４から夫々供給されるＹ垂
直相関有無の検出信号及びＣ垂直相関有無の検出
信号により、夫々次表の如く、４つの組合せ状態
により、予め用意された係数A1，A2を夫々
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier color signal processing circuit, and more particularly to a circuit for reducing noise components of a carrier color signal using a feedback comb filter. Conventional technology Figure 2 shows an example of a general video signal reproducing device.
A block system diagram applied to a VTR is shown. In addition,
In the figure, the C vertical correlation signal detection circuit 24 is indicated by a broken line.
is a part added in the circuit of the present invention. In the figure, a video signal reproduced from a magnetic tape 1 by a magnetic head 2 is supplied via a preamplifier 3 to a high-pass filter (HPF) 4, where a luminance signal is separated, and then sent to a reproduced luminance signal processing circuit 5. The signal is supplied to the H-correlation signal detection circuit 6 via the H-correlation signal, and a detection signal is extracted in the case of non-H-correlation. On the other hand, the output of the preamplifier 3 is supplied to a low-pass filter (LPF) 7, where the carrier color signal is separated, and then passed through a carrier color signal processing circuit 8 to a noise reduction circuit 9 composed of a feedback comb filter. is supplied to In the noise reduction circuit 9, the feedback amount is controlled by a control signal based on the output signal of the H correlation detection circuit 6, and noise components contained in the carrier color signal are reduced. The carrier color signal with reduced noise components and the luminance signal from the reproduced luminance signal processing circuit 5 are sent to the mixing circuit 1
0 and taken out from the output terminal 11. Here, a feedback comb filter is used as a means to reduce noise components included in the carrier color signal, but this is more effective than a non-feedback comb filter.
Excellent SN ratio improvement. However, since it has a drawback that the resolution in the vertical direction deteriorates (vertical color blur), an attempt is made to improve this by using a non-H correlation signal of the luminance signal. FIG. 3 shows a basic block diagram of a carrier color signal reproducing device previously proposed in Japanese Patent Application No. 59-247538 by the present applicant, which is composed of the H correlation signal detection circuit 6 and noise reduction circuit 9 shown in FIG. A phylogenetic diagram is shown. In the same figure, the carrier color signal C (3.58MHz) input to terminal 12
is a subtracter 13, 1H (H is horizontal scanning period) delay circuit (1HDLY) 14, adder 15, limiter 1
7. Noise components are reduced by a feedback comb filter constituted by a coefficient circuit (VCA, voltage control amplifier) 16 and taken out from an output terminal 18. On the other hand, the luminance signal Y entering terminal 19 is
A Y vertical correlation detection circuit 23 composed of a 1HLDY 20, a subtracter 21, and a detector 22 generates a vertical correlation detection signal, which is supplied to the coefficient circuit 16 to control the coefficient K. If there is no correlation between the luminance signals, the luminance signal input to the terminal 19 is turned into a non-vertical correlation signal by the Y vertical correlation detection circuit 23. In this case, the coefficient of the coefficient circuit 16 is controlled to be smaller in the non-vertical correlation signal than in the case of vertical correlation, and therefore, this filter essentially operates as a non-feedback comb filter, whereby: Carried color signals are extracted with less vertical color blur. On the other hand, if there is a correlation with the luminance signal, the vertical correlation signal is extracted from the Y vertical correlation detection circuit 23, and the coefficient K of the coefficient circuit 16 is left unchanged. A vertical contour signal of the carrier color signal containing a noise component is extracted from the output of the adder 15, and this signal is amplitude limited by a limiter 17 at a limiter level S (≪1) of 10% of the maximum amplitude. is multiplied by a coefficient K. In other words, the feedback coefficient K 0 of the feedback loop is K·S, which is smaller than that of the conventional device. As a result, the amplitude of the feedback loop signal can be made smaller than that of the feedback loop signal provided by the conventional device. This feedback loop signal is subtracted from the carrier color signal by a subtracter 13 and taken out from an output terminal 18.
In this case as well, the color blur of the conveyed color signal can be reduced compared to the conventional device, and the image quality can be improved. This is because the limiter 17 makes the feedback coefficient extremely small from K to K.S, increasing the cutoff frequency of the feedback comb filter (vertical reduction filter) and improving signal followability. be. Problems to be Solved by the Invention The circuit proposed above reduces the vertical color blur by reducing the feedback coefficient using the limiter 17, especially when there is no correlation between the carrier color signal and the luminance signal, and also reduces the SN ratio. has been improved, especially Limita 1.
When noise exceeding the limiter level of No. 7 occurs, it is not possible to reliably eliminate this vertical color blurring, and there is also a problem in that there is a limit to the improvement of the S/N ratio. SUMMARY OF THE INVENTION An object of the present invention is to provide a carrier color signal processing circuit that can reliably eliminate vertical color blur even when there is no correlation between the carrier color signal and the luminance signal, and can achieve a higher signal-to-noise ratio. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has the following features:
nH delay circuit (n is 1 or 2, H is horizontal scanning period)
14. First and second coefficient circuits 30 and 3 provided on the input side and output side of the nH delay circuit 14, respectively.
1. A composite signal obtained by combining the carrier color signal supplied from the input terminal 12 and the output signal from the second coefficient circuit 31 is output to the output terminal 18 via the first coefficient circuit 30. A feedback filter 28 constituted by a combining circuit 29 and a feedback filter 28 which adjusts the vertical direction of the carrier color signal according to a composite signal obtained by combining the carrier color signal supplied from the input terminal 12 and the output signal from the second coefficient circuit 31. A C vertical correlation detection circuit 24 that detects correlation; a Y vertical correlation detection circuit 23 that detects vertical correlation of luminance signals; The configuration includes a control circuit 27 that variably controls the coefficients of each of the coefficient circuits 30 and 31. Function The feedback filter 2 is activated by the detection signals of the Y vertical correlation detection circuit 23 and the C vertical correlation detection circuit 24.
The first and second coefficient circuits 30, 3 provided in 8
The respective coefficients A 1 and A 2 of 1 are variably controlled. Embodiment FIG. 1 shows a block system diagram of an embodiment of the circuit of the present invention. In the figure, the same components as those in FIG. 3 are given the same numbers and their explanations will be omitted. In the same figure, 2
Reference numeral 4 denotes a C vertical correlation detection circuit, which is composed of a combining circuit 25 and a detector 26, detects the presence or absence of vertical correlation in the carrier color signal input to the terminal 12, and supplies a detection signal to the control circuit 27. . Synthesis circuit 2 mentioned above
5, as shown in FIG. 1, outputs a composite signal obtained by combining the carrier color signal inputted to the terminal 12 and the carrier color signal supplied from the coefficient circuit 31 to the detector 26. , when an in-phase carrier color signal is supplied from the coefficient circuit 31, this functions as an addition circuit, and when an opposite phase carrier color signal is supplied from the coefficient circuit 31, it functions as a subtraction circuit.
Similarly, a detection signal from the Y vertical correlation detection circuit 23 is also supplied to the control circuit 27. Detector 2
2 and 26 are configured to compare the signals input here with a certain threshold value and output detection signals in two states, for example, the presence or absence of vertical correlation. 28 is a feedback comb filter, and the synthesis circuit 2
9. Coefficient circuit (VCA) 3 with coefficient A 1 set
It is composed of a 0 and 1H delay circuit 14 and a coefficient circuit (VCA) 31 set with a coefficient A 2 , and the coefficients A 1 and A 2 of the coefficient circuits 30 and 31 are as described below.
It is configured to be variably set as appropriate using a control signal from the control circuit 27. The above-mentioned synthesis circuit 29
As shown in FIG. 1, the carrier color signal input to the terminal 12 and the carrier color signal supplied from the coefficient circuit 31 are combined and a synthesized signal obtained is outputted to the coefficient circuit 30. When the carrier color signal of the same phase is supplied from the coefficient circuit 31, this functions as an addition circuit, and when the carrier color signal of opposite phase is supplied from the coefficient circuit 30, it functions as a subtraction circuit. The control circuit 27 uses the Y vertical correlation detection signal and the C vertical correlation detection signal supplied from the Y vertical correlation detection circuit 23 and the C vertical correlation detection circuit 24 to detect four combination states as shown in the following table. The coefficients A 1 and A 2 prepared in advance are respectively calculated by
【表】
可変設定する。
制御回路２７では上記第１乃至第４状態を夫々
判断し、これにより、第１状態（輝度も色も変化
している）ではA1＝４、A2＝０、第２状態（輝
度は変化しており、色は変化していない）では
A1＝２、A2＝0.5、第３状態（輝度は変化してお
らず、色は変化している）ではA1＝２、A2＝
0.5、第４状態（輝度も色も変化していない）で
はA1＝１、A2＝0.75に設定する。
この場合、特に、輝度信号間及び搬送色信号間
夫々に垂直相関がない場合（第１状態）、A1＝
４、A2＝０に設定されるので、1H遅延回路１４
から合成回路２９に至る経路の帰還係数は零であ
り、これにより、垂直色にじみを完全になくし得
る。
一方、前記第２状態乃至第４状態の場合、係数
回路３０，３１の夫々の係数A1，A2を可変設定
しているので、前述の本出願人が先に提案した第
３図示の回路ように係数回路１６の係数Ｋをその
ままとして垂直色にじみを除去していたものに比
して垂直色にじみをより十分に除去し得る。
なお、検出器２２，２６を、Ｙ垂直相関及びＣ
垂直相関の度合に応じた複数段（例えば８、又は
それ以上等）の状態の検出信号に出力するように
構成し、この複数段の状態に夫々対応して係数
A1，A2を夫々設定するようにしてもよい。
又、本実施例はVTRの再生系に適用したもの
であるが、これに限定されるものではないことは
勿論である。
又、搬送色信号の周波数は3.58MHz（NTSC方
式）に限定されるものではない。
又、1H遅延回路１４はNTSC方式の場合であ
り、PAL方式は2H遅延回路である。つまり、こ
の部分はnH遅延回路（ｎ＝１ではNTSC方式、
ｎ＝２ではPAL方式）を用いる。
発明の効果
本発明回路によれば、Ｙ垂直相関検出回路及び
Ｃ垂直相関検出回路の夫々の検出信号にて帰還形
くし形フイルタに設けられた２個の係数回路の
夫々の係数を可変制御する構成としたため、搬送
色信号と輝度信号とに相関がある場合は勿論、相
関がない場合でも本出願人提案回路に比して垂直
色にじみをより少なくし得、この場合、特に、本
出願人提案回路のリミツタのレベル以上のノイズ
が発生しても係数を適宜選定することにより垂直
色ににじみを少なくし得、又、輝度信号及び搬送
色信号の各垂直相関の有無の組合せによつてきめ
細かに制御し得るので、より細かくノイズ低減効
果を得ることができ、よりSN比を改善し得、こ
の場合、係数回路の各係数を大に設定してよりノ
イズ低減効果を大にすることができる等の特長を
有する。[Table] Set variable. The control circuit 27 judges each of the first to fourth states, and as a result, in the first state (brightness and color are changing), A 1 = 4, A 2 = 0, and in the second state (brightness is changing). (and the color has not changed)
A 1 = 2, A 2 = 0.5, in the third state (brightness is not changing, color is changing) A 1 = 2, A 2 =
0.5, and in the fourth state (no change in brightness or color), A 1 =1 and A 2 =0.75. In this case, especially when there is no vertical correlation between the luminance signals and between the carrier color signals (first state), A 1 =
4. Since A 2 = 0, 1H delay circuit 14
The feedback coefficient of the path from to the combining circuit 29 is zero, thereby making it possible to completely eliminate vertical color fringing. On the other hand, in the case of the second to fourth states, the coefficients A 1 and A 2 of the coefficient circuits 30 and 31 are variably set, so that the circuit shown in the third diagram previously proposed by the applicant mentioned above is Thus, vertical color fringing can be more effectively removed than in the case where vertical color fringing is removed while leaving the coefficient K of the coefficient circuit 16 unchanged. Note that the detectors 22 and 26 are connected to Y vertical correlation and C
It is configured to output a detection signal of multiple stages (e.g., 8 or more) depending on the degree of vertical correlation, and a coefficient is set corresponding to each of the multiple stages of states.
A 1 and A 2 may be set respectively. Further, although this embodiment is applied to a reproduction system of a VTR, it is needless to say that the present invention is not limited to this. Furthermore, the frequency of the carrier color signal is not limited to 3.58MHz (NTSC system). Further, the 1H delay circuit 14 is for the NTSC system, and is a 2H delay circuit for the PAL system. In other words, this part is an nH delay circuit (NTSC method when n=1,
When n=2, PAL method) is used. Effects of the Invention According to the circuit of the present invention, the respective coefficients of the two coefficient circuits provided in the feedback comb filter are variably controlled by the respective detection signals of the Y vertical correlation detection circuit and the C vertical correlation detection circuit. Because of this configuration, it is possible to reduce vertical color fringing even when there is a correlation between the carrier color signal and the luminance signal as well as when there is no correlation, compared to the circuit proposed by the present applicant. Even if noise exceeding the level of the limiter in the proposed circuit occurs, it is possible to reduce vertical color blurring by appropriately selecting the coefficients, and fine-grained blurring can be achieved by combining the presence/absence of vertical correlation between the luminance signal and the carrier color signal. Since the noise reduction effect can be controlled more precisely, the SN ratio can be further improved, and in this case, each coefficient of the coefficient circuit can be set to a large value to further increase the noise reduction effect. It has the following features.
第１図は本発明回路の一例のブロツク系統図、
第２図は一般の回路及び本発明回路をVTRに適
用した場合のブロツク系統図、第３図は本出願人
が先に提案した回路のブロツク系統図である。
１２……搬送色信号入力端子、１４，２０……
1H遅延回路、１８……出力端子、１９……輝度
信号入力端子、２１……減算器、２２，２６……
検出器、２３……Ｙ垂直相関検出回路、２４……
Ｃ垂直相関検出回路、２５，２９……合成回路、
２７……制御回路、２８……帰還形くし形フイル
タ、３０，３１……係数回路。
FIG. 1 is a block system diagram of an example of the circuit of the present invention.
FIG. 2 is a block system diagram when a general circuit and the circuit of the present invention are applied to a VTR, and FIG. 3 is a block system diagram of a circuit previously proposed by the applicant. 12... Carrier color signal input terminal, 14, 20...
1H delay circuit, 18...output terminal, 19...luminance signal input terminal, 21...subtractor, 22, 26...
Detector, 23...Y vertical correlation detection circuit, 24...
C vertical correlation detection circuit, 25, 29... synthesis circuit,
27... Control circuit, 28... Feedback comb filter, 30, 31... Coefficient circuit.
Claims (1)
期間）、該nH遅延回路の入力側及び出力側に夫々
設けられた第１及び第２の係数回路、入力端子か
ら供給される搬送色信号と該第２の係数回路から
の出力信号とを合成して得た合成信号を該第１の
係数回路を介して出力端子に出力する合成回路に
て構成される帰還形フイルタと、 前記入力端子から供給される搬送色信号と前記
第２の係数回路からの出力信号とを合成した合成
信号に応じて搬送色信号の垂直相関を検出するＣ
垂直相関検出回路と、 輝度信号の垂直相関を検出するＹ垂直相関検出
回路及び該Ｃ垂直相関検出回路からの夫々の検出
信号に応じて前記第１及び第２の係数回路の夫々
の係数を可変制御する制御回路とよりなることを
特徴とする搬送色信号処理回路。 ２ 該制御回路は、該Ｙ垂直相関検出回路及び該
Ｃ垂直相関検出回路の夫々の検出信号に応じて該
第１及び第２の係数回路の夫々の係数を複数段階
に可変制御する回路であることを特徴とする特許
請求の範囲第１項記載の搬送色信号処理回路。 ３ 該制御回路は、該Ｙ垂直相関検出回路及び該
Ｃ垂直相関検出回路の夫々の検出信号による各相
関の有無の４つの組合せ状態に応じて、該第１及
び第２の係数回路の夫々の係数を予め設定れてい
る値に可変設定する回路であることを特徴とする
特許請求の範囲第１項記載の搬送色信号処理回
路。[Claims] 1 nH delay circuit (n is 1 or 2, H is horizontal scanning period), first and second coefficient circuits provided on the input side and output side of the nH delay circuit, respectively, and an input terminal a feedback circuit that outputs a composite signal obtained by combining the carrier color signal supplied from the carrier color signal and the output signal from the second coefficient circuit to the output terminal via the first coefficient circuit; C type filter, which detects the vertical correlation of the carrier color signal according to a composite signal obtained by combining the carrier color signal supplied from the input terminal and the output signal from the second coefficient circuit;
Coefficients of the first and second coefficient circuits are varied according to respective detection signals from a vertical correlation detection circuit, a Y vertical correlation detection circuit that detects vertical correlation of the luminance signal, and the C vertical correlation detection circuit. A carrier color signal processing circuit comprising: a control circuit for controlling a carrier color signal; 2. The control circuit is a circuit that variably controls the respective coefficients of the first and second coefficient circuits in a plurality of stages according to the respective detection signals of the Y vertical correlation detection circuit and the C vertical correlation detection circuit. A carrier color signal processing circuit according to claim 1, characterized in that: 3. The control circuit controls each of the first and second coefficient circuits according to the four combination states of presence/absence of each correlation based on the respective detection signals of the Y vertical correlation detection circuit and the C vertical correlation detection circuit. 2. The carrier color signal processing circuit according to claim 1, wherein the circuit variably sets a coefficient to a preset value.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60198959A JPS6259489A (en) | 1985-09-09 | 1985-09-09 | Carrier chrominance signal processing circuit |
| KR1019860007287A KR900009063B1 (en) | 1985-09-09 | 1986-09-01 | Carrier color signal processing circuit |
| DE8686306941T DE3680272D1 (en) | 1985-09-09 | 1986-09-09 | CIRCUIT FOR PROCESSING A COLOR CARRIER SIGNAL. |
| EP86306941A EP0217565B1 (en) | 1985-09-09 | 1986-09-09 | Carrier chrominance signal processing circuit |
| US06/906,402 US4766486A (en) | 1985-09-09 | 1986-09-09 | Carrier chrominance signal processing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60198959A JPS6259489A (en) | 1985-09-09 | 1985-09-09 | Carrier chrominance signal processing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6259489A JPS6259489A (en) | 1987-03-16 |
| JPH0573112B2 true JPH0573112B2 (en) | 1993-10-13 |
Family
ID=16399779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60198959A Granted JPS6259489A (en) | 1985-09-09 | 1985-09-09 | Carrier chrominance signal processing circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6259489A (en) |
-
1985
- 1985-09-09 JP JP60198959A patent/JPS6259489A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6259489A (en) | 1987-03-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |