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    • 1. 发明授权
    • Circuit arrangement for separating chrominance and luminance information
in a composite video signal of an NTSC system
    • 用于分离NTSC系统的复合视频信号中的色度和亮度信息的电路装置
    • US4205335A
    • 1980-05-27
    • US888657
    • 1978-03-21
    • Isao NakagawaHiroaki NabeyamaTomomitsu Kuroyanagi
    • Isao NakagawaHiroaki NabeyamaTomomitsu Kuroyanagi
    • H04N9/66H04N9/78H04N9/535H04N9/50
    • H04N9/78
    • A color signal processing circuit comprising a first bandpass filter for extracting a modulated color signal from a composite video signal, a first comb filter having two charge transfer devices and a subtractor for providing a first sampled color signal, a second comb filter having two charge transfer devices and a subtractor for providing a second sampled color signal, an adder circuit for arithmetically determining a sum of the first and second sampled color signals, a second bandpass filter for reproducing only the modulated color signal from the sum of the first and second sampled color signals, and a subtraction circuit for arithmetically determining a difference signal between the composite video signal and an output signal from the second bandpass filter, so that first and second demodulated color signal outputs utterly free of a luminance signal component are obtained from the first and second comb filters respectively through a low pass filter while a luminance signal output is obtained from the subtraction circuit which is utterly free of a color signal component, whereby the prevention of the cross-color phenomenon as well as the dot interference can be achieved.
    • 一种彩色信号处理电路,包括用于从复合视频信号中提取调制色信号的第一带通滤波器,具有两个电荷转移装置的第一梳状滤波器和用于提供第一采样颜色信号的减法器,具有两个电荷转移的第二梳状滤波器 设备和用于提供第二采样颜色信号的减法器,用于算术地确定第一和第二采样彩色信号的和的加法器电路,用于仅从第一和第二采样颜色的和再现仅调制的彩色信号的第二带通滤波器 信号和减法电路,用于算术地确定复合视频信号和来自第二带通滤波器的输出信号之间的差分信号,使得完全没有亮度信号分量的第一和第二解调彩色信号输出从第一和第二 梳状滤波器分别通过低通滤波器同时输出亮度信号 是从完全没有颜色信号分量的减法电路获得的,从而可以实现防止交叉色现象以及点干扰。
    • 2. 发明授权
    • Video synchronous detector apparatus
    • 视频同步检测仪
    • US4188639A
    • 1980-02-12
    • US862622
    • 1977-12-20
    • Toshio MurakamiMasaru NodaHiroaki NabeyamaTakeshi Murakami
    • Toshio MurakamiMasaru NodaHiroaki NabeyamaTakeshi Murakami
    • H04N5/455H04N9/66H04N9/50
    • H04N9/66
    • A video synchronous detector apparatus for discriminating a video intermediate frequency signal, in which the video intermediate frequency signal is divided into two parts, one of which is applied to one terminal of a multiplier circuit, and the other of which is applied to the other terminal of the multiplier circuit through a picture-carrier intermediate frequency extraction circuit having a frequency selection circuit and a limiter circuit. The frequency selection circuit is provided with a trap circuit. The trap circuit has a center resonance frequency equal to a differential frequency between a picture-carrier intermediate frequency (f.sub.p) and a differential frequency between a color subcarrier intermediate frequency (f.sub.c) and a sound-carrier intermediate frequency (f.sub.s) so that a so-called sound-cross-color disturbance caused by a beat between the intermediate frequency sound signal and the intermediate frequency picture signal may be reduced.
    • 一种用于鉴别视频中频信号的视频同步检波器装置,其中视频中频信号被分成两部分,其中一个应用于乘法器电路的一个终端,另一个应用于另一个终端 通过具有频率选择电路和限幅电路的图像载波中频提取电路。 频率选择电路设置有陷波电路。 陷波电路的中心谐振频率等于图像载波中频(fp)与彩色副载波中频(fc)和声载波中频(fs)之间的差分频率之间的差分频率,使得 可以降低由中频声音信号和中频图像信号之间的拍子引起的焦距的声音交叉色干扰。
    • 10. 发明授权
    • Synchronizing signal regenerator
    • 同步信号再生器
    • US3941930A
    • 1976-03-02
    • US460971
    • 1974-04-15
    • Katsuo MohriYoshizumi WatataniHiroaki NabeyamaTakehiko Yoshino
    • Katsuo MohriYoshizumi WatataniHiroaki NabeyamaTakehiko Yoshino
    • H04N5/06H04L7/04H04L7/00
    • H04L7/041H04L7/046
    • A synchronizing signal regenerator for regenerating all the required synchronizing signals from a composite signal having a plurality of synchronizing signals having a different repetition period and phase. The composite signal comprises a video signal and a pulse code modulated audio multiplex signal arranged in a predetermined sequence. The composite signal further comprises a first synchronizing signal consisting of a certain predetermined pulse series synchronized with a modulated pulse series of the audio multiplex signal and a second pulse code modulated synchronizing signal including a plurality of other synchronizing signals required for the reproduction of the video signal and the audio multiplex signal. The synchronizing signals are inserted at a certain predetermined portion in the video signal and in the audio multiplex signal.The synchronizing signal regenerator comprises means for reproducing the first synchronizing signal after detecting the insertion position of the first synchronizing signal, a means for reproducing a predetermined part of a synchronizing signal among the second synchronizing signals using the first synchronizing signal as the reference, a means for frequency dividing at least one of the reproduced parts of the second synchronizing signal, and means for synchronizing the frequency divided signal by using the parts of the second synchronizing signal having the same phase as the other second synchronizing signals to be reproduced among said part of the second synchronizing signals.
    • 一种同步信号再生器,用于从具有不同重复周期和相位的多个同步信号的复合信号中再生所有所需的同步信号。 复合信号包括以预定顺序排列的视频信号和脉冲编码调制音频多路复用信号。 复合信号还包括第一同步信号,该第一同步信号由与音频多路复用信号的调制脉冲序列同步的某个预定脉冲序列组成,第二脉冲编码调制同步信号包括再现视频信号所需的多个其它同步信号 和音频复用信号。 同步信号被插入到视频信号和音频复用信号中的某个预定部分。