CN1047491C - 亮度/色度视频混合电路 - Google Patents

亮度/色度视频混合电路 Download PDF

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CN1047491C
CN1047491C CN93117030A CN93117030A CN1047491C CN 1047491 C CN1047491 C CN 1047491C CN 93117030 A CN93117030 A CN 93117030A CN 93117030 A CN93117030 A CN 93117030A CN 1047491 C CN1047491 C CN 1047491C
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signal
terminal
component
order
luminance
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CN1085724A (zh
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K·A·克林克
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Technicolor USA Inc
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Thomson Consumer Electronics Inc
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/641—Multi-purpose receivers, e.g. for auxiliary information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

网络(30)将亮度(Y)和色度(C)信号组合起来以提供复合视频信号(S4)，其中色度信号经过带通滤波以抑制低频噪声，亮度信号在彩色副载波频率下按预定指标进行滤波以抑制色点。在最佳实施例中，滤波器只由一个电感器和一个电容器构成，从而不但避免了显示画面中出现人为的缺陷，还因使用了数目最少的元件而达到了经济可靠的效果。

Description

亮度/色度视频混合电路
本发明涉及彩色电视接收机，特别涉及彩色电视接收机中用以混合亮度和色度分量的电路。
在电视接收机中通常是对视频信号顺次进行分离的。例如，将射频信号加以检波、解调以提供基带信号。基带复合信号经再次处理后形成亮度和色度信号。色度信号经解调形成色差信号。经处理之后，基带亮度信号和色差信号被转换成RGB(红、绿、兰)之类的最终形式而显示出来。
在画中画处理器中，有时候输入取复合的形式、输出取混合的形式是有好处的，例如，大图象取复合形式，插图或小图象取分量的形式。采用快速(多路转换)开关来组合这些信号以便进一步处理和显示时，需要先把这些分量组合成复合形式。直接的方法是只把亮度分量和色度分量相加起来即可，但这样做会在插图中产生某些人为的缺陷。
据发现，在经过画中画处理之后，或广义地说在经过其它一些形式的处理之后，将亮度信号和色度信号加起来时，发现其中有一个问题与噪声的影响有关。更具体地说，按照本发明的第一方面，我们发现，在由数字处理所产生的的小图象色度输出信号中(折叠分量aliasing Components)可能出现低频噪声。我们发现这种噪声会在画中画的显示画面上产生类似非梳状滤波器接收机中出现的3.58兆赫点(3.58MHZ dots)那么大的大点(large dots)。出自于抑制这种噪声分量连同抑制亮度输出中的3.58兆赫副载波和削弱高频时钟谐波的需要，我们设计出了本说明书所述的处理滤波器。
作为本发明解决这个问题的办法，如这里所述的那样，是将亮度和色度信号组合起来，使这两种信号相加，从而(1)从色度信号中抑制低频(低于2兆赫)噪声，并(2)使亮度信号受到3.58兆赫(彩色副载波)的较小(例如6分贝)的陷波作用。
在本发明的最佳实施例中，上述目的是在一个元件数为最少的网络中实现的，该网络采用同样的LC(电感电容)电路来抑制低频，使亮度分量达到所要求的带通特性。
附图举例说明了本发明。在该唯一的附图中示出了本发明带有亮度色度合成器的电视系统的实施例。
图中的接收机10有一个画中画处理器12，处理器12的输入端14和16分别用以接收主图象和插入图象的复合视频输入信号S1和S2。一般设计的处理器12输出复合形式的主图象视频信号S3，并输出作为亮度分量Y和色度分量C的分量形式的插入图象。Y和C分量按本发明由亮度色度信号合成器30(虚线方框中)组合，得出的复合视频信号S4连同主图象信号S3一起加到多路转换开关20上，以形成画中画信号S5，由处理显示单元30进一步处理和显示。
亮度/色度合成器30具有输入端子31和32以及输出端子33，各输入端分别用以接收待混合的色度和亮度信号C和Y，输出端用以提供经组合的输出复合信号S4。在单元30中，色度输入端子31经第一电阻器R1接地，并经串联连接的电容器C1和电感器L1接端子32。端子32还经负载电阻器R2接地，并经另一电容器C2接输出端子33。
作为举例，上述各元件的元件值如下：
R1                          270欧
C1                          33微微法
L1                          56微亨
R2                            390欧
C2                            150微微法
在上述给定的元件值下(为NTSC制的标准电视信号而给定)，滤波器使色度分量在大约3.58兆赫的彩色副载波频率下受到大约7.75分贝的陷波作用。带通的Q值接近1，时延约170纳秒。图中所示滤波器的主要好处是，用同样的LCC(电感电容)元件达到所要求的两种频率响应特性(例如，抑制色度信号的亮度分量和2兆赫以下的色信号的低频抑制)。总之，网络30总的效果是提供组合(复合)输出信号，输出信号中的亮度分量在彩色副载波频率下形成有大约7.75分贝的陷波，彩色分量则受到带通滤波以消除低频亮度噪声，从而解决了因直接组合信号而产生的视频人为缺陷。
网络30的好处是，只需用一对负载电阻器、一个电感器和一个电容器(另一个电容器为耦合电容器)。这种方案与采用分立滤波器的情况相比较，在经济上的好处是很明显的，采用主滤波器可能需要进一步处理以补偿时延。
对本发明在这里所展示和说明的实施例是可以作种种变更和修改的。例如，采用PAL制信号时，彩色副载波的陷波应在PAL彩色副载波频率处。此外，本发明具有通用性，可与画中画处理器之外的视频源配用。

Claims (4)

1．一种信号合成器，包括：
视频信号源(12)，用以提供色度分量信号(C)并用以提供亮度分量信号(Y)；和
滤波网络(30)，其第一端子(31)用以接收所述色度信号分量，其第二端子(32)用以接收所述亮度信号分量，其电路装置(C1,L1,R1,R2)则与所述第一和第二端子耦合，用以对所述分量信号进行滤波和组合，从而形成复合视频输出信号(S4)；
其特征在于，所述复合视频输出信号是在指定的所述第一端子或第二端子(32)上形成。
2．如权利要求1所述的信号合成器，其特征还在于，所述电路装置(C1,L1,R1,R2)包括一个这样的滤波器，该滤波器对其中一个分量信号具有给定的滤波特性，对另一个所述分量信号则具有不同的滤波特性。
3．如权利要求1所述的信号合成器，其特征还在于，所述滤波网络(30)有一个第三端子用以接收参考电位源(地)，且所述电路元件包括在所述第一(31)与第二(32)端子之间串联连接的电感器(L1)和电容器(C1)，和连接在所述第一端子或第二端子与所述第三端子之间的第一电阻器(R1)和第二电阻器(R2)。
4．如权利要求1所述的信号合成器，其特征还在于，所述复合视频输出信号是在加有所述亮度分量信号的所述第二端子(32)上形成，此外该合成器还包括应用器件(C2,20)，与所述第二端子连接，以便应用所述复合视频输出信号。
CN93117030A 1992-09-16 1993-09-15 亮度/色度视频混合电路 Expired - Fee Related CN1047491C (zh)

Applications Claiming Priority (2)

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US945,832 1992-09-16
US07/945,832 US5296921A (en) 1992-09-16 1992-09-16 Two port network with shared elements for combining and filtering luma and chroma components to form composite video signal

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CN1085724A CN1085724A (zh) 1994-04-20
CN1047491C true CN1047491C (zh) 1999-12-15

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US (1) US5296921A (zh)
EP (1) EP0588167B1 (zh)
JP (1) JP3357428B2 (zh)
KR (1) KR100299359B1 (zh)
CN (1) CN1047491C (zh)
DE (1) DE69327282T2 (zh)
ES (1) ES2139619T3 (zh)
MY (1) MY109823A (zh)
PT (1) PT588167E (zh)
SG (1) SG81863A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9451227B2 (en) 2014-09-09 2016-09-20 Hon Hai Precision Industry Co., Ltd. Signal synthesis circuit to synthesize luma signals and chroma signals

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5473390A (en) * 1995-01-31 1995-12-05 Thomson Consumer Electronics, Inc. Component to composite video signal converter circuit
KR101440260B1 (ko) * 2014-03-31 2014-09-17 (주) 넥스트칩 영상 신호 전송 및 수신 방법 및 장치

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9451227B2 (en) 2014-09-09 2016-09-20 Hon Hai Precision Industry Co., Ltd. Signal synthesis circuit to synthesize luma signals and chroma signals

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EP0588167A2 (en) 1994-03-23
PT588167E (pt) 2000-06-30
KR100299359B1 (ko) 2001-10-22
CN1085724A (zh) 1994-04-20
KR940008522A (ko) 1994-04-29
EP0588167B1 (en) 1999-12-15
JPH06197361A (ja) 1994-07-15
DE69327282T2 (de) 2000-04-13
SG81863A1 (en) 2001-07-24
EP0588167A3 (en) 1995-01-04
JP3357428B2 (ja) 2002-12-16
DE69327282D1 (de) 2000-01-20
US5296921A (en) 1994-03-22
MY109823A (en) 1997-08-30
ES2139619T3 (es) 2000-02-16

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