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公开(公告)号：US5047866A
公开(公告)日：1991-09-10
申请号：US323841
申请日：1989-03-15
CPC分类号： H04N9/7908 , H04N9/79
摘要： A luminance and chrominance signal separation circuit for use in a video tape recorder wherein in the recording mode a three-line comb filter is made to be an adaptive type comb filter for separating a luminance signal from a chrominance signal and in the playback mode the comb filter is made to eliminate residual chrominance signal components in the luminance signal. Switching circuits are provided in the invention to permit the switching of the luminance and chrominance signal separation circuit between recording and playback modes and noise reduction is accomplished by a feedback line correlation circuit.
摘要翻译： 一种用于录像机的亮度和色度信号分离电路，其中在记录模式下，三线梳状滤波器被制成自适应型梳状滤波器，用于将亮度信号与色度信号分离，并且在重放模式下，梳状 滤波器用于消除亮度信号中的残余色度信号分量。 在本发明中提供开关电路以允许在记录和重放模式之间切换亮度和色度信号分离电路，并且通过反馈线相关电路实现降噪。
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公开(公告)号：US4249213A
公开(公告)日：1981-02-03
申请号：US74761
申请日：1979-09-11
CPC分类号： H04N5/45
摘要： A picture-in-picture television receiver is disclosed in which a television picture to be inset is compressed at a compression rate of 1/n and inset as a small-picture in part of a main television picture or large picture, and a single field memory for small-picture reproduction is provided therein in or from which a video signal can be randomly read and written line by line as a unit. In the single field memory is stored the small-picture video signal line by line by the application of a writing clock in which case the time taken in the writing is less than 1/(n+1) of a horizontal period. Then, from the memory is read the stored small-picture information by the application of a reading clock of n times the frequency of the writing clock during the time that writing is not performed, and supplied to be inset in the main television picture. A small-capacity buffer memory is provided at the prestage or following stage of the field memory to prevent the read/write timing overlap in the field memory irrespective of whether the small-picture and the main television picture are synchronized or not in the transmission systems. Thus, the capacity of the field memory essential for the small-picture is about a half of the conventional one.
摘要翻译： 公开了一种画中画电视接收机，其中要插入的电视图像以1 / n的压缩率被压缩，并且作为主要电视图像或大图像的一部分的小图像插入，并且单个场 在其中提供用于小图像再现的存储器，其中视频信号可以作为一个单元逐行地随机读取和写入。 在单场存储器中，通过应用写入时钟逐行存储小图像视频信号，在这种情况下，写入时所花费的时间小于水平周期的1 /（n + 1）。 然后，通过在不执行写入的时间期间通过应用写入时钟的频率的n倍的读取时钟来从存储器读取所存储的小图像信息，并将其提供给主电视图像中的插入。 在场存储器的前级或后级提供小容量缓冲存储器，以防止在现场存储器中的读/写定时重叠，而不管小图像和主电视图像是否在传输系统中同步 。 因此，小图片所必需的场记忆体的容量大约是常规场景的一半。
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公开(公告)号：US4748422A
公开(公告)日：1988-05-31
申请号：US770
申请日：1987-01-06
CPC分类号： H03H11/1291 , H03G1/0023 , H03H11/20
摘要： An amplifier suitable for use as an active filter such as a low-pass filter, a high-pass filter or a phase shifter, which can be easily formed as part of an integrated circuit. The amplifier includes first and second transistors, which together form a first differential amplifier for converting the voltage of the input signal thereto to a signal current. It also includes third and fourth transistors, which together form a second differential amplifier for dividing the signal current from the second transistor in a given ratio. A capacitor is connected to the collector of the fourth transistor, and first and second resistors are connected, respectively, to emitters of the first and second transistors. The current division ratio of the current flowing through the third and fourth transistors is controlled by a control voltage DC supplied to the base of the third transistor and the base of the fourth transistor. In the amplifier, the signal current shunted in the current division ratio K between the third and fourth transistors flow through the load capacitor so that the time constant of the active filter is controlled, the ratio K being controlled by the control voltage V.sub.c. The control voltage V.sub.c also compensates for the inaccuracy of the values of the resistors and capacitors.
摘要翻译： 适合用作有源滤波器的放大器，例如低通滤波器，高通滤波器或移相器，其可以容易地形成为集成电路的一部分。 放大器包括第一和第二晶体管，它们一起形成第一差分放大器，用于将输入信号的电压转换成信号电流。 它还包括第三和第四晶体管，它们一起形成一个第二差分放大器，以给定的比例分配来自第二晶体管的信号电流。 电容器连接到第四晶体管的集电极，第一和第二电阻分别连接到第一和第二晶体管的发射极。 流过第三和第四晶体管的电流的当前分频比由提供给第三晶体管的基极和第四晶体管的基极的控制电压DC控制。 在放大器中，以第三和第四晶体管之间的当前分频比K分流的信号电流流过负载电容器，从而控制有源滤波器的时间常数，比例K由控制电压Vc控制。 控制电压Vc也补偿了电阻和电容值的不准确性。
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公开(公告)号：US4476491A
公开(公告)日：1984-10-09
申请号：US406565
申请日：1982-08-09
CPC分类号： H04N5/211
摘要： A wide-band ghost reduction circuit apparatus for a television receiver comprises a ghost detector, two transversal filters having delay characteristics different from each other, a switch for selecting one of the filters and an automatic gain control circuit responsive to the output of the ghost detector for controlling the filters and the switch. Each of the transversal filters includes tap amplifiers whose gains are controlled by the automatic gain control circuit and having outputs connected, respectively, to tap inputs of delay devices formed of such as a CCD each provided with a tap and included in the associated transversal filter. Output end of one of the transversal filters having a smaller delay is connected to a selected one of the input tap of the other transversal filter through a switch so that input video signal components join together at every input terminal or every individual tap position of the delay devices.
摘要翻译： 一种用于电视接收机的宽带重放电路装置，包括：重影检测器，具有彼此不同的延迟特性的两个横向滤波器，用于选择滤波器之一的开关和响应于重影检测器输出的自动增益控制电路 用于控制过滤器和开关。 每个横向滤波器包括抽头放大器，其增益由自动增益控制电路控制，并且具有输出分别连接到由诸如CCD的延迟装置的抽头输入，各个提供有抽头并且包括在相关联的横向滤波器中。 具有较小延迟的一个横向滤波器的输出端通过开关连接到另一横向滤波器的选定的一个输入抽头，使得输入视频信号分量在延迟的每个输入端或每个单独的抽头位置处连接在一起 设备。
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公开(公告)号：US4612585A
公开(公告)日：1986-09-16
申请号：US530629
申请日：1983-09-09
申请人： Osamu Takase , Tomomitsu Kuroyanagi
发明人： Osamu Takase , Tomomitsu Kuroyanagi
CPC分类号： H04N9/83 , H04N9/7936
摘要： A chrominance signal recording and reproducing circuit for a video tape recorder in which a frequency-modulated luminance signal and a low-frequency converted chrominance signal are mixed to be recorded and reproduced. A sideband emphasis type dynamic emphasis circuit composed of a diode limiter circuitry and an LC trap circuitry is provided in a recording system for recording the chrominance signal, while a sideband deemphasis circuit composed of at least a diode limiter circuitry and an LC trap circuitry is provided in a chrominance signal reproducing system. A circuit configuration is adopted in which the functions of the emphasis circuit and the deemphasis circuit are exchangeably performed by a common circuit.
摘要翻译： 用于混合记录和再现调频亮度信号和低频转换色度信号的磁带录像机的色度信号记录和再现电路。 在用于记录色度信号的记录系统中提供由二极管限制器电路和LC陷波电路组成的边带强调型动态加重电路，同时提供由至少二极管限制器电路和LC陷波电路构成的边带去加重电路 在色度信号再现系统中。 采用电路结构，其中加重电路和去加重电路的功能由公共电路交换执行。
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公开(公告)号：US4524380A
公开(公告)日：1985-06-18
申请号：US447387
申请日：1982-12-07
CPC分类号： H04N5/923 , H04N9/7933 , H04N9/7936 , H04N9/83 , H04N9/84 , H04N9/898
摘要： A chroma signal recording and reproducing circuit of a magnetic recording and reproducing apparatus having a recording circuit for frequency-modulating a luminance signal of a color video signal, low-frequency converting a chroma signal and frequency-multiplexing those signals for recording and a reproducing circuit for frequency-converting the low-frequency converted chroma signal in a reproduced signal and frequency-demodulating the FM luminance signal to reproduce a color video signal is disclosed. The circuit comprises a chroma signal recording circuit including a first ACC circuit and a first frequency converter connected to the first ACC circuit, and a chroma signal reproducing circuit including a second ACC circuit, a second frequency converter connected to the second ACC circuit, a comb filter connected to the second frequency converter and a deemphasis circuit connected to the output of the comb filter.
摘要翻译： 具有用于对彩色视频信号的亮度信号进行频率调制的记录电路，对色度信号进行低频转换和频率复用这些用于记录的信号的磁记录和再现装置的色度信号记录和再现电路以及再生电路 用于对再现信号中的低频转换色度信号进行频率转换，并对FM亮度信号进行频率解调以再现彩色视频信号。 该电路包括色度信号记录电路，该色度信号记录电路包括连接到第一ACC电路的第一ACC电路和第一变频器，以及包括第二ACC电路的色度信号再现电路，连接到第二ACC电路的第二变频器，梳子 连接到第二变频器的滤波器和连接到梳状滤波器的输出的去加重电路。
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公开(公告)号：US4858030A
公开(公告)日：1989-08-15
申请号：US87706
申请日：1987-08-21
申请人： Masuo Oku , Yoshimichi Kudo , Tomomitsu Kuroyanagi , Kazuo Kondo , Hisanobu Tsukazaki , Tetsuya Ikeda , Akio Nakashima , Takashi Kimura
发明人： Masuo Oku , Yoshimichi Kudo , Tomomitsu Kuroyanagi , Kazuo Kondo , Hisanobu Tsukazaki , Tetsuya Ikeda , Akio Nakashima , Takashi Kimura
摘要： A reproducing apparatus of a video disc player, wherein for a special reproduction such as a fast forward reproduction, or a reverse reproduction from a CLV disc, a field memory is provided for storing video signals of length of one field. A reading-in operation to the field memory is synchronized with a reproduced synchronizing signal. A writing-out operation from the field memory is synchronized with a reference synchronizing signal. A discontinuity of phase caused by a track jump is eliminated, and a stabilized picture on a TV monitor can be provided.
摘要翻译： 一种视频光盘播放器的再现装置，其中对于诸如快进再现的特殊再现或来自CLV盘的反向再现，提供了用于存储一场长度的视频信号的场存储器。 对场存储器的读入操作与再现的同步信号同步。 来自现场存储器的写出操作与参考同步信号同步。 消除由轨道跳跃引起的相位的不连续性，并且可以提供电视监视器上的稳定图像。
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8.发明授权Circuit arrangement for separating chrominance and luminance information in a composite video signal of an NTSC system 失效用于分离NTSC系统的复合视频信号中的色度和亮度信息的电路装置
公开(公告)号：US4205335A
公开(公告)日：1980-05-27
申请号：US888657
申请日：1978-03-21
CPC分类号： H04N9/78
摘要： 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.
摘要翻译： 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。
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公开(公告)号：US4782246A
公开(公告)日：1988-11-01
申请号：US62587
申请日：1987-06-16
CPC分类号： H03H11/20 , H03L7/0812
摘要： A phase shift circuit comprises a variable phase shifter responsive to an externally supplied voltage to change the amount of phase shift, and a phase detector operative to detect a phase difference between input and output signals of the variable phase shifter and supply a voltage complying with the phase difference to the variable phase shifter. When the center frequency of the variable phase shifter is changed by reason of production errors and temperature variations to deviate the phase shift amount from a desired value, the phase detector controls the center frequency such that the phase shift amount can be fixed to the desirably predetermined value.
摘要翻译： 相移电路包括响应外部提供的电压以改变相移量的可变移相器，以及相位检测器，用于检测可变移相器的输入和输出信号之间的相位差，并提供符合 相位差到可变移相器。 当可变移相器的中心频率由于生产误差和温度变化而改变时，相位偏移量偏离期望值，相位检测器控制中心频率，使得相移量可以固定到期望的预定值 值。
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10.发明授权Automatic phase control color signal circuit for video tape recorders operating in the NTSC or PAL systems 失效用于在NTSC或PAL系统中操作的录像机的自动相位控制彩色信号电路
公开(公告)号：US4607292A
公开(公告)日：1986-08-19
申请号：US480790
申请日：1983-03-31
CPC分类号： H04N9/84 , H04N9/7925 , H04N9/898
摘要： A color signal processing circuit in a video tape recorder for recording a low frequency converted color signal has a voltage controlled oscillator for generating a carrier having a center frequency which is M times as high as a low-frequency sub-carrier frequency, where M is an integer, and a detection circuit for detecting a variation of the oscillation frequency of the voltage controlled oscillator in at least a reproduction mode. A suppression circuit suppresses the change of the oscillation frequency of the voltage controlled oscillator in response to the output signal from the detection means and a control circuit changes the center oscillation frequency of the voltage controlled oscillator depending on whether the signal is processed in the NTSC system or the PAL system in such a way that the suppression range for the change of the oscillation frequency of the voltage controlled oscillator by the suppression for the NTSC system is equal to or wider than that for the PAL system. The control circuit includes a pulse-eliminating frequency divider or a variable frequency division factor.
摘要翻译： 用于记录低频转换颜色信号的录像机中的彩色信号处理电路具有压控振荡器，用于产生中心频率为低频子载波频率M倍的载波，其中M为 以及检测电路，用于至少在再现模式中检测压控振荡器的振荡频率的变化。 抑制电路响应于来自检测装置的输出信号而抑制压控振荡器的振荡频率的变化，并且控制电路根据在NTSC系统中处理信号是否改变压控振荡器的中心振荡频率 或PAL系统，使得通过对NTSC系统的抑制来改变压控振荡器的振荡频率的抑制范围等于或大于PAL系统的抑制范围。 控制电路包括脉冲消除分频器或可变分频因子。
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