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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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2.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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公开(公告)号：US4554596A
公开(公告)日：1985-11-19
申请号：US438246
申请日：1982-11-01
CPC分类号： H04N9/84
摘要： Disclosed is a color video signal recording apparatus wherein the chrominance signal and the luminance signal are separated from the composite color video signal, the luminance signal is transformed into a frequency modulation signal and the chrominance signal is converted to have a lower frequency so that both reformed signals are recorded on a frequency multiplex basis on a recording medium. In processing a TV signal of CCIR system, the chrominance signal is controlled to have a frequency of 3/8 N.multidot.f.sub.H (where N is an odd number) and have its phase shifted by 90.degree. in every horizontal scanning period; in processing a TV signal of NTSC system, the chrominance signal is controlled to have a frequency of 3/8 N.multidot.f.sub.H (where N is an integer) and have its phase shifted by 90.degree. or 180.degree. in every horizontal scanning period, while the control being made such that 1/4 N is an integer in case of 90.degree. phase shift of (3N-2)/4 is an integer in case of 180.degree. phase shift.
摘要翻译： 公开了一种彩色视频信号记录装置，其中色度信号和亮度信号与复合彩色视频信号分离，将亮度信号变换为频率调制信号，并将色度信号转换为具有较低的频率，使得重整 信号在记录介质上以频率多路复用为基础记录。 在处理CCIR系统的TV信号时，色度信号被控制为具有3/8 N×fH（N为奇数）的频率，并且在每个水平扫描周期中相位偏移90°; 在处理NTSC系统的TV信号时，色度信号被控制为具有3/8 N×fH（其中N是整数）的频率，并且在每个水平扫描周期中其相位偏移90°或180°，而控制 使得在180°相移的情况下，（3N-2）/ 4的90°相移的情况下，1/4 N是整数。
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公开(公告)号：US4367484A
公开(公告)日：1983-01-04
申请号：US210812
申请日：1980-11-26
CPC分类号： H04N5/45
摘要： A picture-in-picture color television receiver for simultaneously displaying on a screen a first and a second picture read out from a memory in a state that the second picture is inserted in the first picture, is disclosed. A DC restoration circuit for DC-restoring a color difference signal of the second picture DC-restores a color difference signal of the second picture at the reference level coincident with the reference level of the color difference signal of the first picture, thereby to make the white balance of the first picture coincident with that of the second picture.
摘要翻译： 公开了一种画中画彩色电视接收机，用于在第二画面被插入第一画面的状态下同时在画面上显示从存储器读出的第一画面和第二画面。 用于DC恢复第二图像DC的色差信号的DC恢复电路 - 恢复与第一图像的色差信号的参考电平一致的参考电平的第二图像的色差信号，从而使 第一张图片的白平衡符合第二张照片的白平衡。
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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：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：US4586083A
公开(公告)日：1986-04-29
申请号：US331280
申请日：1981-12-16
申请人： Tomomitsu Kuroyanagi
发明人： Tomomitsu Kuroyanagi
CPC分类号： H04N5/211
摘要： The output signals from the first set of delay elements of m each with a first delay time are selectively applied to a second set of delay elements of n each with a second delay time by means of a switch. The output signals from the said first and said second of delay elements are processed by the individual gain controllable circuits and are composed by an adder. The gains of the gain controllable circuits are respectively controlled by output signals from the control voltage generating circuits which are set by the output signals from comparators for comparing the television signal supplied to the input terminal with a reference signal from the reference signal generating circuit, so that the ghost interference in the television receiver can be reduced by a lesser number of delay elements by subtracting the output signals of the adder circuits from the television input signal in subtractor circuits.
摘要翻译： 来自具有第一延迟时间的m的第一组延迟元件的输出信号通过开关被选择性地施加到具有第二延迟时间的n的第二组延迟元件。 来自所述第一和第二延迟元件的输出信号由各个增益可控电路处理，并由加法器组成。 增益可控电路的增益分别由来自控制电压发生电路的输出信号控制，该输出信号由比较器的输出信号设置，用于将提供给输入端的电视信号与来自参考信号发生电路的参考信号进行比较，因此， 通过在减法器电路中从电视输入信号中减去加法器电路的输出信号，可以通过较少数量的延迟元件来减少电视接收机中的幽灵干扰。
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