公开(公告)号：US5001553A

公开(公告)日：1991-03-19

申请号：US310559

申请日：1989-02-15

申请人： Yasutoshi Matsuo ,  Hiroshi Yamada

发明人： Yasutoshi Matsuo ,  Hiroshi Yamada

IPC分类号： H04N9/78

CPC分类号： H04N9/78

摘要： A luminance signal/color signal separation circuit includes a band-pass filter for picking up a color signal from a composite image signal; a delay circuit for sequentially delaying by one line the color signal picked up by the band-pass filter and obtaining three past, present and future line information; a first operation circuit for outputting a signal which takes a value having a larger absolute value when the past and future line information have the same sign, and takes an algebraic sum of the past and future line information when the past and future line information have different signs; a second operation circuit for outputting a signal which takes a value having a smaller absolute value when the output from the first operation circuit and the present line information have the same sign, and takes a reference value when the output from the first operation circuit and the present line information have different signs; and a third operation circuit for obtaining a color signal by subtracting the output from the second operation circuit from the present line information.

公开(公告)号：US5099314A

公开(公告)日：1992-03-24

申请号：US241746

申请日：1988-09-08

申请人： Yasutoshi Matsuo ,  Hiroshi Yamada

发明人： Yasutoshi Matsuo ,  Hiroshi Yamada

IPC分类号： H04N9/78

CPC分类号： H04N9/78

摘要： A luminance signal/color signal separation circuit comprises a bandpass filter which separates a first color signal partially including a luminance signal component from a composite image signal, a delay circuit which delays the first color signal to obtain a second color signal, a logic circuit which outputs a luminance component signal from the first color signal and the second color signal, a first adder/subtracter which extracts a third color signal free from the luminance signal component by combining the luminance component signal and the first color signal, and a second adder/subtracter which extracts luminance signal by combining the third color signal and the composite image signal. Another luminance signal/color signal separation circuit comprises a wide range bandpass filter which separates a first color signal from a composite image signal, a delay circuit which delays the first color signal to obtain a second color signal, a logic circuit which outputs color signal with a wide range or with a reduced level is response to the degree of vertical correlation of pictures, and an adder/subtracter which outputs a luminance signal. Color signal with a narrow range can be outputted in place of the signal with the reduced level.

摘要翻译： 亮度信号/颜色信号分离电路包括：带通滤波器，其将来自合成图像信号的部分包括亮度信号分量的第一颜色信号，延迟第一颜色信号以获得第二颜色信号的延迟电路分离;逻辑电路， 从第一颜色信号和第二颜色信号输出亮度分量信号，第一加法器/减法器，其通过组合亮度分量信号和第一颜色信号提取没有亮度信号分量的第三颜色信号，以及第二加法器/ 减法器，其通过组合第三颜色信号和合成图像信号来提取亮度信号。 另一个亮度信号/颜色信号分离电路包括从合成图像信号分离第一颜色信号的宽范围带通滤波器，延迟第一颜色信号以获得第二颜色信号的延迟电路，输出彩色信号的逻辑电路， 宽范围或降低电平是对图像的垂直相关程度的响应，以及输出亮度信号的加法器/减法器。 可以输出具有窄范围的彩色信号来代替具有降低的电平的信号。

公开(公告)号：US4969033A

公开(公告)日：1990-11-06

申请号：US505182

申请日：1990-04-05

申请人： Hiroshi Yamada ,  Ryo Nakano ,  Yasutoshi Matsuo ,  Seiichi Mikami

发明人： Hiroshi Yamada ,  Ryo Nakano ,  Yasutoshi Matsuo ,  Seiichi Mikami

IPC分类号： H04N9/64 ,  H04N9/79 ,  H04N9/83 ,  H04N9/84 ,  H04N5/21

CPC分类号： H04N9/7917 ,  H04N9/646 ,  H04N9/83 ,  H04N9/84

摘要： In a circuit for removing crosstalk components in a carrier chrominance signal, there are provided a first delay circuit (20), an inverter (21), a first higher-voltage detecting circuit (18), a second delay circuit (22), a second higher-voltage detecting circuit (19), a third higher-voltage detecting circuit (25), a first lower-voltage detecting circuit (23), a second lower-voltage detecting circuit (24), a third lower-voltage detecting circuit (17), and an adder (26) thereby producing a crosstalk-removed carrier chrominance signal. Furthermore, the first delay circuit (20), the inverter (21), and an adder (28) form a comb filter for correcting a time delay due to said circuit for removing crosstalk components in a carrier chrominance signal.

公开(公告)号：US4984069A

公开(公告)日：1991-01-08

申请号：US260553

申请日：1988-10-20

申请人： Hiroshi Yamada ,  Yasutoshi Matsuo

发明人： Hiroshi Yamada ,  Yasutoshi Matsuo

IPC分类号： H04N9/78

CPC分类号： H04N9/78

摘要： In a YC separator for generating a chrominance signal C including no chrominance separation error by selecting a second highest potential signal of the first chrominance signal a, the second chrominance signal c' including a separation error and a reference signal, only when a picture having two different colors at a border between n-th line and (n-1)th line is displayed, a correction value of 1/2 is generated as the reference signal, in order to obtain C=1 and Y=0 for prevention of n-th line dot crawl. Further, when a vertical stripe picture (black and white lines are alternately arranged) is displayed, a chrominance signal Cc including much less unnecessary signal components can be obtained through an arithmetic circuit and on the basis of a chrominance signal Cc' including error components and an average signal D between the past and future line chrominance signals A and C, in order to eliminate cross-color at the upper and lower ends of the picture and Yc signal blur.

公开(公告)号：US4930005A

公开(公告)日：1990-05-29

申请号：US285263

申请日：1988-12-16

申请人： Hiroshi Yamada ,  Ryo Nakano ,  Yasutoshi Matsuo ,  Seiichi Mikami

发明人： Hiroshi Yamada ,  Ryo Nakano ,  Yasutoshi Matsuo ,  Seiichi Mikami

IPC分类号： H04N9/64 ,  H04N9/79 ,  H04N9/83 ,  H04N9/84

CPC分类号： H04N9/7917 ,  H04N9/646 ,  H04N9/83 ,  H04N9/84

摘要： In a circuit for removing crosstalk components in a carrier chrominance signal, there are provided a first delay circuit (20), an inverter (21), a first higher-voltage detecting circuit (18), a second delay circuit (22), a second higher-voltage detecting circuit (19), a third higher-voltage detecting circuit (25), a first lower-voltage detecting circuit (23), a second lower-voltage detecting circuit (24), a third lower-voltage detecting circuit (17), and an adder (26) thereby producing a crosstalk-removed carrier chrominance signal. Furthermore, the first delay circuit (20), the inverter (21), and an adder (28) form a comb filter for correcting a time delay due to said circuit for removing crosstalk components in a carrier chrominance signal.

公开(公告)号：US5153741A

公开(公告)日：1992-10-06

申请号：US389396

申请日：1989-08-04

申请人： Yasutoshi Matsuo ,  Ryo Nakano

发明人： Yasutoshi Matsuo ,  Ryo Nakano

IPC分类号： H04N9/79 ,  H04N9/84

CPC分类号： H04N9/7908 ,  H04N9/84

摘要： A crosstalk cancelling circuit for a VTR eliminates adjacent-track crosstalk in a playback down-converted chrominance signal, with the resultant signal and a playback luminance signal being supplied to respective output terminals for re-recording by another VTR. Substantially improved display image quality is obtained from the re-recorded video signals, by comparison with prior art methods.

摘要翻译： 用于VTR的串扰消除电路消除了重放下变频色度信号中的相邻轨道串扰，其中所得到的信号和重放亮度信号被提供给相应的输出端，以通过另一个VTR重新记录。 通过与现有技术方法相比，从再记录的视频信号获得显着改善的显示图像质量。

公开(公告)号：US4771341A

公开(公告)日：1988-09-13

申请号：US863746

申请日：1986-05-15

申请人： Masayuki Shimizu ,  Yasutoshi Matsuo

发明人： Masayuki Shimizu ,  Yasutoshi Matsuo

IPC分类号： H04N9/79 ,  H04N9/83 ,  H04N9/87

CPC分类号： H04N9/7908 ,  H04N9/83

摘要： A video signal recording and playback apparatus in which in a record mode operation a frequency-modulated luminance signal and a carrier chrominance signal whose frequency has been converted to a one lower than that of the luminance signal are written superposed on each other in a magnetic recording medium and, in a playback mode operation, the signal read out of the recording medium is separated into a reproduced color signal and a reproduced luminance signal, then the two reproduced signals are subjected to predetermined signal processing by individual signal processing systems, and then the processed signals are mixed by a mixer to produce a reproduced color video signal. The mixer to which the reproduced luminance signal is applied is preceded by a comb filter which is operable using a chrominance subcarrier frequency of the reproduced chrominance signal as a reference.

摘要翻译： 在记录模式操作中，其频率已被转换为比亮度信号低的频率的调频亮度信号和载波色度信号的视频信号记录和重放装置在磁记录中被叠加在一起 介质，并且在重放模式操作中，从记录介质读出的信号被分离为再现的彩色信号和再现的亮度信号，则两个再现信号经过各个信号处理系统的预定信号处理，然后 经处理的信号由混频器混合以产生再现的彩色视频信号。 应用了再生亮度信号的混频器之前是可使用再现的色度信号的色度副载波频率进行操作的梳状滤波器作为参考。

公开(公告)号：US4916527A

公开(公告)日：1990-04-10

申请号：US201926

申请日：1988-06-03

申请人： Yasutoshi Matsuo

发明人： Yasutoshi Matsuo

IPC分类号： H04N9/78

CPC分类号： H04N9/78

摘要： A luminance signal/color signal separation circuit comprises a color signal separation circuit for obtaining a first color signal partially including luminance signal component from a composite image signal, a computation circuit for obtaining a second color signal including a color separation error signal by eliminating the luminance signal component from the first color signal to take out a signal of the second highest potential of the first and second color signals and a reference potential, thus to take out a third color signal excluding the color separation error signal, and a luminance signal separation circuit for obtaining a luminance signal from the composite signal and the third color signal. This circuit is constituted to first consider a signal which seems to be a C signal as a C signal once at least to effect computation between that signal and current line data, whereby when the result thereof indicates that considering that signal as C signal is correct, that signal is used as C signal, while when erroneous, that signal is not used as C signal. Thus, drawbacks, e.g., dot crawl of Y signal and/or half tone or color shift of C signal do not occur.

摘要翻译： 亮度信号/颜色信号分离电路包括彩色信号分离电路，用于从合成图像信号获得部分地包括亮度信号分量的第一颜色信号，用于通过消除亮度来获得包括分色误差信号的第二颜色信号的计算电路 从第一颜色信号获取信号分量，以取出第一和第二颜色信号的第二高电位信号和参考电位，从而取出不包括色分离误差信号的第三颜色信号，以及亮度信号分离电路 用于从复合信号和第三颜色信号获得亮度信号。 该电路构成为首先考虑作为C信号的似乎是C信号的信号，一次至少在该信号和当前行数据之间进行计算，由此当其结果表明考虑到该信号为C信号是正确的时， 该信号用作C信号，而当错误时，该信号不用作C信号。 因此，不会发生缺点，例如Y信号的点爬行和/或C信号的半色调或色移。

公开(公告)号：US4864404A

公开(公告)日：1989-09-05

申请号：US209650

申请日：1988-06-21

申请人： Yasutoshi Matsuo

发明人： Yasutoshi Matsuo

IPC分类号： H04N5/911 ,  H04N5/923

CPC分类号： H04N5/911 ,  H04N5/923

摘要： A noise reduction circuit for use in a video signal recording and/or reproducing apparatus for eliminating noise components from an input luminance signal comprises a high pass filter circuit for extracting a high frequency signal component from the input luminance signal, a first limiter circuit for limiting the high frequency signal component at a first limiting level, a multiplier circuit for determining the degree of preemphasis and/or deemphasis by multiplying a predetermined coefficient to the limited signal, summing and subtracting circuits respectively for adding and subtracting the output signal of the first amplifying means to and from the input luminance signal, and a feedback loop for feeding back the output signal of the high pass filter circuit to its input port. The feedback loop comprises a second multiplier circuit which modifies the amplitude of the signal passing therethrough by a second level which is set substantially higher than the first level of the first limiter circuit.

摘要翻译： 用于从输入亮度信号中消除噪声分量的视频信号记录和/或再现装置中使用的降噪电路包括：用于从输入亮度信号中提取高频信号分量的高通滤波器电路，用于限制 在第一限制电平的高频信号分量，乘法电路，用于通过将预定系数与限制信号相乘来确定预加重和/或去加重的程度，分别用于对第一放大器的输出信号进行加法和减法， 来自输入亮度信号的装置，以及用于将高通滤波器电路的输出信号反馈到其输入端口的反馈回路。 反馈回路包括第二乘法器电路，其将通过其的信号的幅度修改第二电平，该第二电平被设置为大大高于第一限幅器电路的第一电平。

公开(公告)号：US4860105A

公开(公告)日：1989-08-22

申请号：US195585

申请日：1988-05-18

申请人： Hironao Sakaguchi ,  Masaji Yoshida ,  Yasutoshi Matsuo

发明人： Hironao Sakaguchi ,  Masaji Yoshida ,  Yasutoshi Matsuo

IPC分类号： H04N5/923

CPC分类号： H04N5/923

摘要： A noise reduction circuit for a video signal recording and/or reproducing apparatus comprises a high pass filter for extracting high frequency signal component form the input luminance signal, a limiter circuit for limiting the high frequency signal component, a multiplier for determining the degree of preemphasis and/or deemphasis by multiplying the limited signal, and summing and subtracting circuits respectively for adding and subtracting the high frequency signal component processed by the limiter circuit and the multiplier to and from the original luminance signal. The limiter circuit has an amplitude characteristic which changes a gradient so as to have a characteristic curve of at least three different gradient slopes interconnected in succession with an increase in amplitude of the signal supplied thereto.