利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

89 条记录 (耗时 0.028 秒)

    Apparatus and methods for recording information signals and tracking signals on magnetic tape
    51.
    发明授权
    Apparatus and methods for recording information signals and tracking signals on magnetic tape 失效
    用于在磁带上记录信息信号和跟踪信号的装置和方法

    公开(公告)号：US5459617A

    公开(公告)日：1995-10-17

    申请号：US139635

    申请日：1993-10-20

    申请人： Naofumi Yanagihara

    发明人： Naofumi Yanagihara

    IPC分类号： G11B5/53 ,  G11B5/008 ,  G11B5/588 ,  G11B15/467 ,  H04N5/7826 ,  G11B5/02

    CPC分类号： H04N5/7826 ,  G11B5/0086 ,  G11B5/00878 ,  G11B5/588

    摘要： An apparatus for recording information and tracking signals on magnetic tape includes first and second magnetic heads for recording the information signals on the magnetic tape. The first and second magnetic heads are mounted for rotation about an axis for scanning the magnetic tape for recording the information signals in successive tracks. The first and second magnetic heads are disposed at respective positions along the axis separated from one another by substantially one track pitch and have respectively different azimuth angles. A third magnetic head serves to record the tracking signals on the magnetic tape and is mounted at a position rotationally substantially opposite a rotational position of the first magnetic head and is substantially axially aligned therewith. In accordance with a method of recording information and tracking signals on magnetic tape, the information signals are recorded on the magnetic tape with the use of first and second magnetic heads mounted for rotation about an axis at respective axial positions spaced by substantially one track pitch. The first and second magnetic heads have respectively different azimuth angles, such that the information signals are recorded at correspondingly different azimuth angles in successive tracks. The tracking signals are recorded in at least some of the successive tracks with azimuth angles substantially the same as those of the information signals in adjacent ones of the successive tracks.

    摘要翻译： 用于在磁带上记录信息和跟踪信号的装置包括用于在磁带上记录信息信号的第一和第二磁头。 安装第一和第二磁头用于围绕一个轴旋转以便扫描磁带以将信息信号记录在连续轨道中。 第一和第二磁头设置在沿相互分开的基本上一个磁道间距的轴线的相应位置处，并且分别具有不同的方位角。 第三磁头用于将跟踪信号记录在磁带上，并且安装在与第一磁头的旋转位置大致相反的位置处，并基本上与第一磁头的旋转位置相对准。 根据在磁带上记录信息和跟踪信号的方法，利用第一和第二磁头将信息信号记录在磁带上，该第一和第二磁头安装成围绕轴线旋转，在相应的轴向位置处以基本上一个轨道间距间隔开。 第一和第二磁头分别具有不同的方位角，使得信息信号在相继的轨道中以相应不同的方位角记录。 跟踪信号被记录在至少一些连续轨道中，方位角与基本上相邻轨道中信息信号的方位角基本相同。

    Method and apparatus for detecting tracking errors
    52.
    发明授权
    Method and apparatus for detecting tracking errors 失效
    检测跟踪错误的方法和装置

    公开(公告)号：US5233488A

    公开(公告)日：1993-08-03

    申请号：US699322

    申请日：1991-05-13

    申请人： Naofumi Yanagihara

    发明人： Naofumi Yanagihara

    IPC分类号： G11B15/467

    CPC分类号： G11B15/4678

    摘要： Tracks scanned by a playback head are provided with a first signal recorded in every nth track, a second signal recorded in a track which precedes and is adjacent to each nth track and a third signal recorded in a track which follows and is adjacent to each nth track. When a preceding track is scanned, the second signal recorded therein is detected; and at a time delayed from the detection of that second signal, the first signal picked up as a crosstalk component is sensed. When a following track is scanned, the third signal recorded therein is detected; and at a time delayed from the detection of the third signal, the first signal picked up as a crosstalk component is sensed. The difference between the first signal sensed when a preceding track is scanned and the first signal sensed when a following track is scanned is indicative of a tracking error.

    Method and apparatus for converting image information
    54.
    发明授权
    Method and apparatus for converting image information 失效
    用于转换图像信息的方法和装置

    公开(公告)号：US06658157B1

    公开(公告)日：2003-12-02

    申请号：US09605035

    申请日：2000-06-27

    申请人： Kazushi Satoh ,  Takeshi Kubozono ,  Shintaro Okada ,  Yu Liu ,  Naofumi Yanagihara

    发明人： Kazushi Satoh ,  Takeshi Kubozono ,  Shintaro Okada ,  Yu Liu ,  Naofumi Yanagihara

    IPC分类号： G06K936

    CPC分类号： H04N19/00 ,  G06F17/147 ,  H04N19/122 ,  H04N19/132 ,  H04N19/146 ,  H04N19/152 ,  H04N19/18 ,  H04N19/40 ,  H04N19/61 ,  H04N19/70

    摘要： A technique is disclosed for reducing the bit rate of a bit stream coded into a compressed form according to the MPEG-2 standard, without causing significant degradation in image quality of a decoded image. An inverse DCT converter dequantizes a MPEG-2 bit stream and outputs resultant discrete cosine transform coefficients for each DCT block. A band limiter replaces the values of high-frequency components of the discrete cosine transform coefficients in the horizontal direction, with 0. A quantizer quantizes the discrete cosine transform coefficients using a quantization step value different from the original value.

    摘要翻译： 公开了一种用于根据MPEG-2标准降低编码成压缩形式的比特流的比特率的技术，而不会导致解码图像的图像质量的显着劣化。 逆DCT转换器对MPEG-2比特流进行去量化，并输出每个DCT块的合成离散余弦变换系数。 频带限制器用水平方向将离散余弦变换系数的高频分量的值替换为0.量化器使用不同于原始值的量化步长值来量化离散余弦变换系数。

    Method and system for improved digital video data processing using 4-point discrete cosine transforms
    56.
    发明授权
    Method and system for improved digital video data processing using 4-point discrete cosine transforms 失效
    使用4点离散余弦变换改进数字视频数据处理的方法和系统

    公开(公告)号：US06215909B1

    公开(公告)日：2001-04-10

    申请号：US08971904

    申请日：1997-11-17

    申请人： Ching-Fang Chang ,  C. C. Lee ,  Naofumi Yanagihara

    发明人： Ching-Fang Chang ,  C. C. Lee ,  Naofumi Yanagihara

    IPC分类号： G06K936

    CPC分类号： G06F17/147 ,  G06T9/007

    摘要： Methods and systems for data compression and decompression are disclosed. Specifically, the method for data compression of the present invention receives four inputs representing pixel information of an image and performs a combination of a 4-point discrete cosine transform (DCT) and a weighting function to obtain four outputs representing digital representations of an image. The method for data decompression receives four inputs representing digital representations of an image and performs a combination of an inverse weighting function and a 4-point inverse discrete cosine transform (IDCT) to obtain pixel components of an image. The methods and systems of the present invention may be used in optimizing digital video encoders and decoders.

    摘要翻译： 公开了用于数据压缩和解压缩的方法和系统。 具体地，本发明的数据压缩方法接收表示图像的像素信息的四个输入，并且执行4点离散余弦变换（DCT）和加权函数的组合，以获得表示图像的数字表示的四个输出。 用于数据解压缩的方法接收表示图像的数字表示的四个输入，并执行逆加权函数和4点逆离散余弦变换（IDCT）的组合以获得图像的像素分量。 本发明的方法和系统可用于优化数字视频编码器和解码器。

    1/16 size real time decoding of digital video
    57.
    发明授权
    1/16 size real time decoding of digital video 失效
    数字视频1/16尺寸实时解码

    公开(公告)号：US6104838A

    公开(公告)日：2000-08-15

    申请号：US970338

    申请日：1997-11-14

    申请人： Ching-Fang Chang ,  Naofumi Yanagihara

    发明人： Ching-Fang Chang ,  Naofumi Yanagihara

    IPC分类号： G06T9/00 ,  H04N7/26 ,  H04N7/30 ,  G06K9/36 ,  H04N7/12

    CPC分类号： H04N19/60

    摘要： A system and method to decode encoded video images in such a manner as to maintain high quality images while reducing the computation time needed to decode the images. The system takes into account that the resultant display generated may only have a fraction (1/16) of the resolution of the original image. Thus, optimizations are realized by modifying the inverse discrete cosine transform (IDCT) and inverse weighting (IW) processes to process only the portion of the image to be displayed.

    摘要翻译： 一种解码编码视频图像的系统和方法，以便在减少解码图像所需的计算时间的同时保持高质量图像。 系统考虑到生成的结果显示可能仅具有原始图像的分辨率的分数（+ E，fra 1/16 + EE）。 因此，通过修改逆离散余弦变换（IDCT）和反加权（IW）处理来仅处理要显示的图像的部分来实现优化。

    Method and apparatus for recording digital video signals
    59.
    发明授权
    Method and apparatus for recording digital video signals 失效
    用于记录数字视频信号的方法和装置

    公开(公告)号：US5835664A

    公开(公告)日：1998-11-10

    申请号：US841114

    申请日：1997-04-29

    申请人： Yuka Oikawa ,  Naofumi Yanagihara ,  Nobuaki Izumi

    发明人： Yuka Oikawa ,  Naofumi Yanagihara ,  Nobuaki Izumi

    IPC分类号： G11B15/12 ,  G11B15/18 ,  G11B20/10 ,  H04N5/7826 ,  H04N5/783 ,  H04N5/92 ,  H04N9/804 ,  H04N9/87

    CPC分类号： H04N9/8047 ,  G11B15/125 ,  G11B15/1875 ,  H04N5/783 ,  H04N5/78266 ,  H04N9/87

    摘要： A method and an apparatus for reproducing digital video signals in which every one-frame data of the digital video signals are recorded on n tracks of a recording medium by an inclined azimuth recording system are varying speed reproduced by a rotary head having n heads with a varying playback speed such that A=a(t.multidot.m.+-.1)/n, where a is a constant equal to 1 or 2 and m is a constant which is an integer other than 0. A picture corresponding to the digital video signals read out with the varying playback speed S is displayed on the screen. In this manner, non-continuous lines caused by temporal difference in neighboring macro-blocks during varying speed reproduction may be rendered less obtrusive for improving the picture quality of the varying speed reproduced picture.

    摘要翻译： 一种用于再现数字视频信号的方法和装置，其中通过倾斜方位记录系统将数字视频信号的每一帧数据记录在记录介质的+ E，uns + + EE磁道上，是由旋转 头部具有不同重放速度的n个头，使得A = a（txm +/- 1）/ n，其中+ E，uns a + EE是等于1或2和+ E的常数，uns m + EE是常数 其是除了0之外的整数。在屏幕上显示与以变化的重放速度S读出的数字视频信号相对应的图像。 以这种方式，由于变化速度再现期间的相邻宏块的时间差引起的非连续线可能变得不那么突出，以提高变速再现图像的图像质量。

    Method and apparatus for modifying the quantization step of each macro-block in a video segment
    60.
    发明授权
    Method and apparatus for modifying the quantization step of each macro-block in a video segment 失效
    用于修改视频段中的每个宏块的量化步长的方法和装置

    公开(公告)号：US5677734A

    公开(公告)日：1997-10-14

    申请号：US515529

    申请日：1995-08-15

    申请人： Yuka Oikawa ,  Naofumi Yanagihara ,  Nobuaki Izumi

    发明人： Yuka Oikawa ,  Naofumi Yanagihara ,  Nobuaki Izumi

    IPC分类号： H04N5/92 ,  G11B20/10 ,  H04N7/54 ,  H04N9/804 ,  H04N11/02 ,  H04N7/12

    CPC分类号： H04N9/8047 ,  H04N19/126 ,  H04N19/149 ,  H04N19/176 ,  H04N19/192 ,  H04N19/60 ,  H04N19/88 ,  H04N7/54 ,  H04N19/146

    摘要： A method and apparatus for recording digital video signals in which digital video signals in the form of DCT coefficients, obtained by e.g., discrete cosine transform, are quantized and compressed so as to be recorded on a recording medium. A first quantization step decision unit determines a quantization step in terms of a video segment made up of plural macro-blocks as a unit so that the quantity of quantized data is less than a pre-set data quantity. A second quantization step decision unit determines a quantization step in terms of the macro-blocks as a unit so that the quantity of quantized data is less than the pre-set data quantity. A quantization unit quantizes the digital video signals with the quantization steps determined by the first quantization step decision unit and the second quantization step decision unit. This enables efficient encoding and improved picture quality.

    摘要翻译： 用于记录数字视频信号的方法和装置，其中通过例如离散余弦变换获得的DCT系数形式的数字视频信号被量化和压缩，以便被记录在记录介质上。 第一量化步骤决定单元以由多个宏块构成的视频段为单位确定量化步长，使得量化数据量小于预设数据量。 第二量化步骤决定单元以宏块为单位来确定量化步长，使得量化数据量小于预设数据量。 量化单元利用由第一量化步长决定单元和第二量化步骤决定单元确定的量化步长量化数字视频信号。 这使得能够进行有效的编码和改进的图像质量。