公开(公告)号：US5684784A

公开(公告)日：1997-11-04

申请号：US565076

申请日：1995-11-30

申请人： Yasuo Iwasaki ,  Nobuhiro Chiba

发明人： Yasuo Iwasaki ,  Nobuhiro Chiba

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/14 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/19 ,  G11B27/30

CPC分类号： G11B27/3027 ,  G11B20/10 ,  G11B20/1258 ,  G11B20/1833 ,  G11B27/19 ,  G11B7/14 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10595 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/00745 ,  G11B7/0079

摘要： A data recording apparatus which simultaneously records data to a plurality of radially divided recording areas of a disc recording medium by the CAV method, including a data dividing unit for dividing the input data into amounts of data proportional to the radial lengths of the plurality of recording areas and a plurality of data recording units for simultaneously recording the data to the corresponding recording areas at data recording rates proportional to the radial lengths of the recording areas; a data reproducing apparatus which reproduces data recorded by such a data recording apparatus including a plurality of data reproducing units, provided corresponding to the data recording areas, for simultaneously reproducing data from the recording areas, and a data rearranging unit for rearranging the data reproduced from the recording areas to the same order as the original input data; and a data recording/reproducing apparatus including such a data recording apparatus and data reproducing apparatus.

摘要翻译： 一种数据记录装置，其通过CAV方法同时将数据记录到盘记录介质的多个径向划分的记录区域，包括数据划分单元，用于将输入数据分成与多个记录的径向长度成比例的数据量 区域和多个数据记录单元，用于以与记录区域的径向长度成比例的数据记录速率同时将数据记录到相应的记录区域; 再现由这样的数据记录装置记录的数据的数据再现装置，该数据记录装置包括对应于数据记录区域提供的多个数据再现单元，用于同时从记录区域再现数据;以及数据重新排列单元，用于重新排列从 记录区域与原始输入数据的顺序相同; 以及包括这种数据记录装置和数据再现装置的数据记录/再现装置。

公开(公告)号：US20050232605A1

公开(公告)日：2005-10-20

申请号：US11152500

申请日：2005-06-14

申请人： Nobuhiro Chiba

发明人： Nobuhiro Chiba

IPC分类号： G06F3/06 ,  G11B20/12 ,  G11B27/10 ,  G11B27/30 ,  H04N5/781 ,  H04N5/85 ,  H04N9/804 ,  H04N9/806

CPC分类号： H04N9/8042 ,  G11B27/3027 ,  G11B2220/2516 ,  H04N5/781 ,  H04N9/8063

摘要： This invention relates to a data recording and reproduction apparatus, wherein video data VD and audio data AD are recorded in a recording medium while they are mixed in a compressed state respectively, and are reproduced from this recording medium. The video data is recorded in a recording medium in units of a predetermined length, and subsequently thereto, the audio data is recorded in the recording medium in units of a predetermined length. To each head portion of the video data and audio data, header data VH and AH, which are identification information for identifying these data, are added. When the video data and audio data recorded at different areas in the recording medium are reproduced, the access time is shortened by making the head seeking operation on the basis of the header data and reducing the number of seeking operation.

摘要翻译： 数据记录和再现装置本发明涉及数据记录和再现装置，其中视频数据VD和音频数据AD被分别记录在记录介质中，同时它们被分解成压缩状态，并从该记录介质再现。 视频数据以预定长度为单位记录在记录介质中，随后以预定长度为单位将音频数据记录在记录介质中。 对于视频数据和音频数据的每个头部，添加作为用于识别这些数据的识别信息的标题数据VH和AH。 当记录在记录介质中不同区域的视频数据和音频数据被再现时，通过根据标题数据进行头部寻找操作并减少寻道操作次数来缩短访问时间。

公开(公告)号：US5821883A

公开(公告)日：1998-10-13

申请号：US934708

申请日：1997-09-22

申请人： Nobuhiro Chiba ,  Yasuo Iwasaki

发明人： Nobuhiro Chiba ,  Yasuo Iwasaki

IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B20/10 ,  G11B20/14 ,  H03M5/14 ,  H03M7/14 ,  H04L25/49 ,  H03M7/00

CPC分类号： H03M5/145 ,  G11B20/10009 ,  G11B20/1426

摘要： A data modulation apparatus for modulating data by run-length limited (1,7) modulation including constant data adding means for receiving input data and adding constant data after the input data, status data producing means for performing, in each modulation period, logical operations on at least part of the data output by the constant data adding means of each modulation period and the status data of the modulation period immediately before each modulation period to produce status data of each modulation period, and modulated data producing means for performing, in each modulation period, logical operations on the data output by the constant data adding means of each modulation period and the status data of the modulation period immediately before each modulation period to perform run-length limited (1,7) modulation and produce modulated data. Also, a data demodulation apparatus, run-length limited (1,7) modulated data recording apparatus, and a recording medium used with the same.

摘要翻译： 一种用于通过游程长度限制（1,7）调制来调制数据的数据调制装置，包括用于接收输入数据并在输入数据之后加上常数数据的常数数据添加装置，状态数据产生装置用于在每个调制周期中执行逻辑运算 在每个调制周期的常数数据添加装置输出的数据的至少一部分和紧邻每个调制周期的调制周期的状态数据之间，以产生每个调制周期的状态数据;以及调制数据产生装置， 调制周期，对每个调制周期的常数数据加法装置输出的数据进行逻辑运算，以及紧接在每个调制周期之前的调制周期的状态数据，以执行游程限制（1,7）调制并产生调制数据。 此外，数据解调装置，游程限制（1,7）调制数据记录装置，以及与其一起使用的记录介质。

公开(公告)号：US5557594A

公开(公告)日：1996-09-17

申请号：US360349

申请日：1994-12-21

申请人： Nobuhiro Chiba ,  Yasuo Iwasaki

发明人： Nobuhiro Chiba ,  Yasuo Iwasaki

IPC分类号： G11B20/14 ,  G11B27/30 ,  G11B7/013

CPC分类号： G11B27/3027 ,  G11B20/1426

摘要： To improve the reliability of reproduction by performing signal processing so that substantially (almost) all DC is eliminated when digital data is recorded on a recording medium such as a magneto-optical disk. When data is recorded on a recording medium such as a magneto-optical disk, generally the digital data is modulated and encoded before being recorded, but sometimes the modulation code is not DC free due to a recording channel code of an NRZI system, etc. According to the present invention, data is divided into parts each having a certain constant length so as to prevent the DC component from building up. A resynchronization signal RESYNC is inserted in the break between the parts, the data is preliminarily modulated and encoded subsequent to the RESYNC, the DC component thereof is counted, and the pattern of the RESYNC is changed in the direction so that the phase becomes a minus value when the sum of the DC components DSV (digital sum value) up to before that RESYNC is a plus value and becomes a plus value when the sum is a minus value, that is, the DSV converges to zero, and the changed data is subjected to modulation and encoding, thereby to reduce the DC component of the recording data.

摘要翻译： 为了通过执行信号处理来提高再现的可靠性，使得当将数字数据记录在诸如磁光盘的记录介质上时，基本上（几乎）全部DC被消除。 当数据被记录在诸如磁光盘的记录介质上时，通常在记录之前对数字数据进行调制和编码，但是有时调制码由于NRZI系统的记录信道码而不是无DC的。 根据本发明，数据被分成各自具有一定长度的部分，以防止DC分量的积聚。 重新同步信号RESYNC被插入在这些部分之间的断点中，数据在RESYNC之后被预先调制和编码，其DC分量被计数，并且RESYNC的模式沿着相位变为负的方向改变 当直到分量DSV（数字和值）之前的RESYNC为正值并且当和为负值时变为正值时，即DSV收敛为零，并且改变的数据为 进行调制和编码，从而减少记录数据的DC分量。

公开(公告)号：US5848037A

公开(公告)日：1998-12-08

申请号：US627140

申请日：1996-04-03

申请人： Yasuo Iwasaki ,  Nobuhiro Chiba ,  Kazumichi Hatate

发明人： Yasuo Iwasaki ,  Nobuhiro Chiba ,  Kazumichi Hatate

IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12

CPC分类号： G11B20/10203 ,  G11B11/10515 ,  G11B20/1217 ,  G11B7/00745

摘要： A part of the reference signal used as the reference in recording and reproduction is recorded with the polarity thereof being inverted in a data recording medium or in a data recording apparatus in order to positively reproduce recorded data with a simple configuration. When identification signal NRZI for each sector is repeatedly recorded, for example, a part of this identification signal is recorded with the polarity thereof being inverted.

摘要翻译： 在记录和再现中用作参考的参考信号的一部分被记录为其极性在数据记录介质或数据记录装置中被反转，以便以简单的配置积极地再现记录的数据。 当每个扇区的识别信号NRZI被重复记录时，例如，记录该识别信号的一部分，其极性被反转。

公开(公告)号：US5012361A

公开(公告)日：1991-04-30

申请号：US334556

申请日：1989-04-07

申请人： Nobuhiro Chiba ,  Yoshihiro Murakami

发明人： Nobuhiro Chiba ,  Yoshihiro Murakami

IPC分类号： G11B20/18 ,  H04N5/7826 ,  H04N5/92 ,  H04N5/923 ,  H04N5/926 ,  H04N5/93 ,  H04N5/945 ,  H04N9/802

CPC分类号： H04N9/802 ,  G11B20/1813 ,  G11B20/1876 ,  H04N5/78266 ,  H04N5/9201 ,  H04N5/923 ,  H04N5/926 ,  H04N5/93 ,  H04N5/945

摘要： In an apparatus, such as a digital video tape recorder, for reproducing data signals recorded on helical scan recording tracks each having a plurality of sectors, with two adjacent tracks forming a segment and three segments forming a field, changes of sector and segment identical data are detected during reproduction, and an error signal is generated when a change in a segment occurs without a change in a sector. Either an error correction circuit or a concealing circuit receives the error signal, and is activated to perform error correction or error concealment. As a result, high quality reproduction is achieved, even in a shuttle reproduction mode.

公开(公告)号：US5526135A

公开(公告)日：1996-06-11

申请号：US312178

申请日：1994-09-26

申请人： Nobuhiro Chiba

发明人： Nobuhiro Chiba

IPC分类号： H04N5/783 ,  H04N5/926 ,  H04N7/26 ,  H04N7/30 ,  H04N5/76 ,  H04N5/78

CPC分类号： H04N19/86 ,  H04N5/9264 ,  H04N5/783

摘要： A recording and/or reproducing apparatus for grouping input video data at an interval of a predetermined number of pixels and encoding each block by a DCT circuit, a quantization circuit and an entropy encoding circuit, recording the encoded data on a magnetic tape, and reproducing the magnetic tape for producing block-by-block data, which is decoded to produce output video data, includes a filtering circuit for reducing horizontal and vertical frequency components generated by repetitive occurrences of the respective data blocks. For a differential speed playback mode, such as shuttle playback, the video data reproduced and decoded during the differential speed playback mode is passed through the filtering circuit for producing a satisfactory playback image in which block components are suppressed even for the differential speed playback mode.

摘要翻译： 一种记录和/或再现装置，用于以预定数量的像素的间隔对输入视频数据进行分组，并通过DCT电路，量化电路和熵编码电路对每个块进行编码，将编码数据记录在磁带上，再现 用于产生逐块数据的磁带（其被解码以产生输出视频数据）包括滤波电路，用于减少通过相应数据块的重复出现产生的水平和垂直频率分量。 对于诸如穿梭重放的差分速度重放模式，在差速重放模式期间再现和解码的视频数据通过滤波电路，用于产生即使对于差速重放模式也抑制块分量的令人满意的重放图像。

公开(公告)号：US5239430A

公开(公告)日：1993-08-24

申请号：US588034

申请日：1990-09-25

申请人： Yoshinori Koishikawa ,  Nobuhiro Chiba ,  Yoichiro Asato

发明人： Yoshinori Koishikawa ,  Nobuhiro Chiba ,  Yoichiro Asato

IPC分类号： G11B15/087 ,  G11B15/18 ,  G11B20/12 ,  G11B20/18 ,  G11B27/00 ,  H04N9/802

CPC分类号： G11B15/1875 ,  G11B15/087 ,  G11B20/1208 ,  G11B20/1803 ,  G11B20/1809 ,  G11B20/1876 ,  G11B27/005 ,  H04N9/802 ,  G11B2020/10592 ,  G11B2220/90

摘要： In a digital information signal reproducing apparatus in which a first digital audio signal and a second digital audio signal having the same contents are recorded on two oblique tracks which are close to each other on a record tape while the latter is run at a normal speed, and in which the first and second digital audio signals are reproduced from the tape by plural rotary heads; a head position controller is operative to control a scanning position of each of the rotary heads so that the latter scan the tracks during variable speed reproduction when the tape is run at a speed different from the normal speed, and to cause the heads to periodically jump over a plurality of the tracks; a detector detects when the rotary heads controlled by the head position controller jump over the plurality of tracks; and a processor responsive to the detector for switching the first digital audio signal and the second digital audio signal, as in a cross-fading operation, for a predetermined period when a jump is detected and selecting one of the first digital audio signal and the second digital audio signal depending on an error state in a period other than such predetermined period, thereby ensuring that error correction capability is not lowered at the time of variable speed reproduction.