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公开(公告)号：US20190279680A1
公开(公告)日：2019-09-12
申请号：US16293735
申请日：2019-03-06
Inventor： Tsuyoshi NAKASENDO , Yasumori HINO , Kohei NAKATA
Abstract: A data coding device includes an error correction coder that converts user data into ECC data by error correction coding, a modulation coder that converts the ECC data into a series of modulated code data, a detector that detects a local concentration of modulation marks/modulation spaces that are shorter than or equal to a prescribed minimum run-length plus N from the series of modulated code data, a conversion determiner that judges whether to convert the series of modulated code data into another series of modulated code data, according to a concentration, detected by the detector, of the modulation marks/modulation spaces, and a modulation data converter that converts the series of modulated code data into the another series of modulated code data.
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公开(公告)号：US20160217819A1
公开(公告)日：2016-07-28
申请号：US14991239
申请日：2016-01-08
Inventor： Kohei NAKATA , Harumitsu MIYASHITA
IPC: G11B7/007 , G11B7/0045
CPC classification number: G11B7/0079 , G11B7/00736 , G11B7/00745 , G11B7/24079 , G11B7/24085 , G11B20/1217 , G11B27/3027 , G11B2007/0013 , G11B2007/00754
Abstract: According to an optical disc, a track, where data is recorded in predetermined block units, is formed by wobbling at a spatial period in accordance with a radial position, and the track is divided into zones in a radial direction. Data is recorded in each of the zones at a predetermined line density based on a ratio n/m of the number of bits of a bit pattern of recording data to one wavelength of wobbling. The optical disc includes a first area having one of the zones, a second area having one of the zones different from the one of the zones in the first area, and a line density of data different from a line density of data in the first area, and a BCA where a zone format identifier specifying a zone table defining a boundary position of each of the zones and the ratio n/m is recorded.
Abstract translation: 根据光盘，以预定的块单位记录数据的轨迹是通过在空间周期上根据径向位置进行摆动而形成的，并且轨道被分成径向方向的区域。 基于记录数据的比特模式的比特数与摆动波长的比率n / m，将数据以预定的线密度记录在每个区域中。 光盘包括具有其中一个区域的第一区域，具有与第一区域中的一个区域不同的区域中的一个区域的第二区域和与第一区域中的数据的线密度不同的数据线密度 以及BCA，其中记录了指定限定每个区域的边界位置的区域表格和比率n / m的区域格式标识符。
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公开(公告)号：US20160189745A1
公开(公告)日：2016-06-30
申请号：US14964614
申请日：2015-12-10
Inventor： Junichi MINAMINO , Kohei NAKATA
IPC: G11B20/10
CPC classification number: G11B20/1024 , G11B7/0053 , G11B7/0941 , G11B7/24082 , G11B20/10222 , G11B2007/00754 , G11B2020/1268
Abstract: A phase error detector includes a sine wave generation circuit that generates a sine wave signal, based on a first input signal of a first period, a cosine wave generation circuit that generates a cosine wave signal, based on the first input signal, a first calculator that calculates a phase difference between the sine wave signal and a second input signal of a second period, a second calculator that calculates a phase difference between the cosine wave signal and the second input signal, and a first selection unit that outputs the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is within a predetermined range, and outputs a predetermined value having a same sign as a sign of the phase difference calculated by the first calculator when the phase difference calculated by the second calculator is out of the predetermined range.
Abstract translation: 相位误差检测器包括基于第一周期的第一输入信号产生正弦波信号的正弦波产生电路，基于第一输入信号产生余弦波信号的余弦波产生电路，第一计算器 其计算正弦波信号和第二周期的第二输入信号之间的相位差，计算余弦波信号和第二输入信号之间的相位差的第二计算器，以及输出计算出的相位差的第一选择单元 当由第二计算器计算的相位差处于预定范围内时，通过第一计算器输出由第二计算器计算出的相位差为由第一计算器计算出的相位差的符号的相同符号的预定值， 超出预定范围。
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公开(公告)号：US20220020394A1
公开(公告)日：2022-01-20
申请号：US17281686
申请日：2019-11-08
Inventor： Kohei NAKATA , Yasushi KOBAYASHI
IPC: G11B20/10 , G11B7/0045 , G11B20/12
Abstract: The present disclosure provides an optical disk device capable of reproducing data recorded on a high linear density optical disk stably. The optical disk device according to the disclosure is characterized by being equipped with a recording expected waveform generation circuit which generates, at the time of recording, an expected waveform that is expected to be obtained at the time of decoding; and a recording pulse generation circuit which generates a recording pulse for driving a laser with power and a time width suitable for an amplitude value of the recording expected waveform for each sampling point of the recording expected waveform.
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公开(公告)号：US20190189154A1
公开(公告)日：2019-06-20
申请号：US16223698
申请日：2018-12-18
Inventor： Kohei NAKATA , Tsuyoshi NAKASENDO
IPC: G11B20/10 , G11B7/0045
CPC classification number: G11B20/1037 , G11B7/0045 , G11B20/1833
Abstract: An optical disc device includes a first error correction coding circuit that codes the recording data according to a first error correction coding format, a second error correction coding circuit that codes the recording data according to a second error correction coding format, and a recorder that converts the recording data into a recording signal and records it on an optical disc. The second error correction coding format is different in an arrangement of the recording data from the first error correction coding format. The second error correction coding format is configured to generate a second parity code with a higher degree of redundancy. The recorder records the recording data coded by the first error correction coding circuit and only the second parity code in the recording data coded by the second error correction coding circuit.
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Patent Agency Ranking
公开(公告)号：US20180129566A1
公开(公告)日：2018-05-10
申请号：US15864161
申请日：2018-01-08
Inventor： Kohei NAKATA , Yuji TAKAGI
CPC classification number: G06F11/1076 , G06F3/0619 , G06F3/064 , G06F3/0677 , G11B7/005 , G11B20/10305 , G11B20/10361 , G11B20/1217 , G11B20/1833 , G11B2020/1853 , H03M13/1515 , H03M13/19 , H03M13/2909 , H03M13/2948 , H03M13/35 , H03M13/618
Abstract: In an optical disc apparatus that records and reproduces data onto and from an optical disc in units of predetermined block, an information divider divides the data so as to reduce an amount of the data included in each of blocks when a recording state of the optical disc does not satisfy a predetermined criterion, and reproduces recording data in units of the block by adding sub-information including a value indicating the amount of the data included in each of the blocks. An error-correction encoder circuit encodes the recording data in a first error-correction code format, and a recorder converts encoded recording data into a recording signal, and records the recording signal onto the optical disc. A quality evaluator circuit produces an evaluation value indicating a recording quality based on a result of reproducing the recording signal recorded on the optical disc.
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公开(公告)号：US20180047424A1
公开(公告)日：2018-02-15
申请号：US15652787
申请日：2017-07-18
Inventor： Kohei NAKATA , Harumitsu MIYASHITA
IPC: G11B20/12
CPC classification number: G11B20/1217 , G11B2020/122 , G11B2020/1278
Abstract: An optical disk includes a disk management information area in which predetermined information is recorded in advance, and a recording system area in which information for identifying a recording system of the optical disk recorded in a predetermined position within a non-data area included in a recordable area is recorded. A method for accessing the optical disk is decided based on disk management information and the information for identifying a recording system.
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公开(公告)号：US20170256280A1
公开(公告)日：2017-09-07
申请号：US15335835
申请日：2016-10-27
Inventor： Kohei NAKATA
IPC: G11B7/09 , G11B7/1353 , G11B20/18 , G11B7/005 , G11B7/13
CPC classification number: G11B7/094 , G11B7/0037 , G11B7/005 , G11B7/09 , G11B7/0901 , G11B7/0908 , G11B7/0917 , G11B7/0943 , G11B7/13 , G11B7/1353 , G11B7/1381 , G11B20/10009 , G11B20/10388 , G11B20/10398 , G11B20/10462 , G11B20/18
Abstract: In an optical disc apparatus for reproducing information recorded on a track of an optical disc, an optical head irradiates a light beam onto the track, detects a reflected light reflected by the track, and generates a reproduction signal based on the reflected light. A decoder circuit decodes the reproduction signal, and generates a decoded signal including information recorded on the track. A correlation detector circuit calculates a cross-correlation value between the reproduction signal and the decoded signal. A servo circuit detects a deviation amount of an irradiation position of the light beam onto the track, from the reproduction signal, and controls the irradiation position of the optical head based on the cross-correlation value and the deviation amount.
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19.发明申请公开(公告)号：US20160293200A1
公开(公告)日：2016-10-06
申请号：US14666488
申请日：2014-08-20
Inventor： Kohei NAKATA , Yasumori HINO , Harumitsu MIYASHITA , Junichi MINAMINO , Yoshihisa TAKAHASHI
IPC: G11B7/005 , G11B7/2407 , G11B20/12 , G11B7/0045
CPC classification number: G11B7/0053 , G11B7/0037 , G11B7/0045 , G11B7/00718 , G11B7/00736 , G11B7/0079 , G11B7/2407 , G11B7/24082 , G11B20/1217 , G11B20/1252 , G11B2007/00754 , G11B2020/1242 , G11B2020/1268 , G11B2020/1277 , G11B2020/1294
Abstract: A track of an optical disk is formed by wobbling and divided into zones, a clock ratio of a recording clock to a wobble clock is preset for each zone, a wobble signal is detected from the optical disk, the wobble clock is generated from the wobble signal, a present position is identified by reproducing ADIP indicating a position of the track from the wobble signal and the wobble clock, the recording clock is generated with respect to the wobble clock, a data address present position is identified from the present position, a start end position of the ADIP in a recording target zone, a start end position of the data address in the recording target zone, and the clock ratio, a recording start position is identified based on the data address present position; and the data is recorded from the recording start position of the recording target zone.
Abstract translation: 通过摆动形成光盘的轨道并将其划分为区域，为每个区域预设记录时钟与摆动时钟的时钟比，从光盘检测摆动信号，从摆动产生摆动时钟 信号，通过从摆动信号和摆动时钟再现指示轨道的位置的ADIP来识别当前位置，相对于摆动时钟产生记录时钟，从当前位置识别数据地址存在位置， 记录目标区域中的ADIP的开始结束位置，记录目标区域中的数据地址的开始结束位置和时钟比，基于数据地址存在位置来识别记录开始位置; 并且从记录目标区域的记录开始位置记录数据。
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公开(公告)号：US20160284380A1
公开(公告)日：2016-09-29
申请号：US15172579
申请日：2016-06-03
Inventor： Kohei NAKATA , Yasumori HINO
CPC classification number: G11B20/10222 , G11B7/0037 , G11B7/005 , G11B20/10009 , G11B20/10037 , G11B20/10046 , G11B20/14
Abstract: An optical disc apparatus includes a synchronizer that generates a reproduction clock signal synchronized with a reproduction signal of information recorded in an optical disc medium, and generates a digital reproduction signal synchronized with the reproduction clock signal, an adaptive equalizer that generates a post-adaptive-equalization digital reproduction signal, and a maximum likelihood decoder that performs maximum likelihood decoding of the post-adaptive-equalization digital reproduction signal to generate a binary signal. The apparatus also includes an expected waveform generator that generates an expected waveform from the binary signal, a phase-advance waveform generator that generates a phase-advance waveform, a phase-delay waveform generator that generates a phase-delay waveform, and a metric detector that detects a phase error. In the optical disc apparatus, the synchronizer controls the phase of the digital reproduction signal using the phase error.
Abstract translation: 光盘装置包括产生与记录在光盘介质中的信息的再现信号同步的再现时钟信号的同步器，并产生与再现时钟信号同步的数字再现信号，自适应均衡器， 均衡数字再现信号，以及执行后自适应均衡数字再现信号的最大似然解码以产生二进制信号的最大似然解码器。 该装置还包括从二进制信号产生预期波形的预期波形发生器，产生相位提前波形的相位推进波形发生器，产生相位延迟波形的相位延迟波形发生器，以及度量检测器 它检测相位误差。 在光盘装置中，同步器使用相位误差来控制数字再现信号的相位。
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