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    • 1. 发明授权
    • Modulating method
    • 调制方式
    • US5432799A
    • 1995-07-11
    • US64764
    • 1993-05-19
    • Yoshihide ShimpukuHiroyuki InoYasuyuki ChakiToshiyuki Nakagawa
    • Yoshihide ShimpukuHiroyuki InoYasuyuki ChakiToshiyuki Nakagawa
    • G11B7/00G11B7/004G11B7/0045G11B20/14H03M7/46H03M13/00
    • G11B20/1426
    • A method of modulating digital data to a variable-length code having parameters d, k, m, n, and r for recording information on and reproducing the same from an optical disc. The optimal range of a minimum run length d corresponding to the minimum number of successive same symbols is determined by a procedure which includes a first step to determine the minimum S/N required for obtaining a desired error rate from the relationship between a bit error rate and the S/N when d=0; a second step to obtain the relationship between a change of the numerical value d and that of the S/N by calculating, on the basis of the required minimum S/N obtained at the first step, the S/N loss caused due to the change of the numerical value d; and a third step to determine, from the relationship between the numerical value d and the S/N, the range of the value d corresponding to the S/N of the transmission characteristic dependent on an optical system and an optical disc.
    • 将数字数据调制为具有参数d,k,m,n和r的可变长度代码的方法,用于从光盘记录信息并从光盘再现信息。 对应于连续相同符号的最小数量的最小游程长度d的最佳范围由包括第一步骤的步骤来确定,该步骤确定从误码率之间的关系中获得期望误码率所需的最小S / N 当d = 0时S / N; 通过基于在第一步骤中获得的所需最小S / N计算由于第一步骤所产生的S / N损失而获得数值d与S / N的变化之间的关系的第二步骤 数值变化d; 以及第三步骤,根据数值d和S / N之间的关系,确定与取决于光学系统和光盘的传输特性的S / N相对应的值d的范围。
    • 4. 发明授权
    • Data modulation method
    • 数据调制方式
    • US5469162A
    • 1995-11-21
    • US039730
    • 1993-03-30
    • Yasuyuki ChakiYoshihide ShimpukuHiroyuki Ino
    • Yasuyuki ChakiYoshihide ShimpukuHiroyuki Ino
    • G11B20/14H03M5/14H03M7/14H03M7/00
    • H03M5/145G11B20/1426
    • In a data modulation method, m-bit data is modulated to n-bit data (n.gtoreq.m) having fewer direct current and low frequency components. A dispersion of the digital sum variation of code weights can be reduced, a direct current component is reduced and an error rate can be further reduced by selecting a plurality of modulation tables constituting the combination of one or more sub-groups of modulation data obtained by dividing a group of modulation data by a code weight having the same value based on the digital sum variation of the code weights accumulated until a time at which m-bit data is converted to n-bit code and converting next m-bit data continuously to present m-bit data to n-bit code by using the modulation tables.
    • 在数据调制方法中,m位数据被调制成具有较少直流和低频分量的n位数据(n> / = m)。 可以减少代码权重的数字和变化的偏差,通过选择构成由一个或多个调制数据的子组合组成的多个调制表来减少直流分量并且可以进一步降低错误率, 将一组调制数据除以具有相同值的代码权重,该代码权重基于累积的代码权重的数字和变化,直到将m位数据转换为n位代码并将下一个m位数据连续转换为 通过使用调制表将m位数据提供给n位代码。
    • 6. 发明授权
    • Method for converting and/or detecting data
    • 转换和/或检测数据的方法
    • US5138314A
    • 1992-08-11
    • US728732
    • 1991-07-11
    • Yoshihide ShimpukuHiroyuki InoYasuyuki Chaki
    • Yoshihide ShimpukuHiroyuki InoYasuyuki Chaki
    • G11B20/10G11B20/14
    • G11B20/10101G11B20/10009G11B20/1426
    • In a data conversion method of converting source data of M bit unit to be recorded on a recording medium into conversion data of N (>M) bit unit, n, which is a number of inter-symbol interferences permitted in a transmission path, continuous codes in the codes of the conversion data are weighted with a weighting distribution decreasing linearly from a distribution center, the weighted n continuous codes are sequentially added to form the intermediate series, and then such conversion data that the sum of absolute values of differences of codes between the intermediate series (i.e., the code length) is more than a predetermined number of times as large as a reference value of the weighting coefficient is selected as a modulation code, whereby the pattern length between the code patterns can be made larger to thereby improve the recording density remarkably with using the present recording medium and recording and/or reproducing apparatus. Further, the pattern of the reproduced signal corresponding to the data to be detected is compared with a code pattern group corresponding to each conversion data to select a similar pattern so that the conversion data recorded at a remarkably high recording density can be positively detected while using the present recording medium and recording and/or reproducing apparatus.
    • 7. 发明授权
    • Modulating method and demodulating method as well as modulating
apparatus and demodulating apparatus
    • 调制方法和解调方法以及调制装置和解调装置
    • US5400023A
    • 1995-03-21
    • US29133
    • 1993-03-10
    • Hiroyuki InoYoshihide ShimpukuYasuyuki ChakiToshiyuki Nakagawa
    • Hiroyuki InoYoshihide ShimpukuYasuyuki ChakiToshiyuki Nakagawa
    • G11B20/14H03M5/14H03M7/46
    • H03M5/145G11B20/1426
    • A modulating method and apparatus and a demodulating method and apparatus in which a variable length code (d, k;m, n;r) which can provide a greater minimum reversal distance to allow recording of a higher density than ever is provided. According to the modulating method and apparatus, digital data of a basic data length of m bits is modulated into a variable length code (d, k;m, n;r) of a basic code length of n bits, and where the distance between adjacent ones of the digital data is represented by T, the minimum reversal distance of the variable length code is equal to or greater than 2.0 T and the minimum length of a run of a same symbol is equal to or greater than 4. The demodulating apparatus demodulates the digital data back into the variable length code and comprises storage means for storing therein a plurality of tables for converting the digital data into the variable length code, discriminating means for discriminating the binding length of the digital data, and selecting means for selecting one of the tables in accordance with a result of discrimination of the discriminating means.
    • 提供了可以提供更大的最小反转距离以允许记录比以往更高密度的可变长度码(d,k; m,n; r)的调制方法和装置以及解调方法和装置。 根据调制方法和装置,m比特的基本数据长度的数字数据被调制成n比特的基本码长度的可变长度码(d,k; m,n; r),并且其中 数字数据中的相邻数字由T表示,可变长度码的最小反转距离等于或大于2.0T,同一符号的行程的最小长度等于或大于4.解调装置 将数字数据解调回可变长度码,并且包括用于在其中存储用于将数字数据转换成可变长度码的多个表的存储装置,用于鉴别数字数据的绑定长度的鉴别装置,以及用于选择一个 根据识别装置的辨别结果。
    • 9. 发明授权
    • Method and apparatus for detecting synchronizing signals by latching
successived count values that represent time between received sync
pulses for comparison to a predetermined sync pattern of count values
    • 用于通过锁存表示接收到的同步脉冲之间的时间的连续计数值来检测同步信号的方法和装置,用于与计数值的预定同步模式进行比较
    • US5646966A
    • 1997-07-08
    • US84860
    • 1993-06-29
    • Yasuyuki ChakiHiroyuki Ino
    • Yasuyuki ChakiHiroyuki Ino
    • G11B20/10G11B20/14G11B20/22G11B27/30H04L7/00
    • G11B27/3027G11B20/14G11B20/225
    • A synchronization signal detector for detecting synchronization signals or frame synchronization signals recorded on a recording medium includes a binary-valued signal detector for translating RF signals into binary-valued signals, an edge detection circuit for extracting edge portions of the binary-valued signals, a counter for counting the number of clocks generated by an external source between the edge portions, a number of latch circuits for holding successive clock count values between the edge portions and for successively shifting the clock values held by them, value coincidence circuits for comparing the numbers of clocks between transitions of the synchronization patterns and the clock count values held by the counter and the latch circuits and for outputting a signal indicating a coincidence in case of complete coincidence between the numbers of clocks and the clock count values and an AND circuit for taking a logical sum of the outputs of the value coincidence circuits and the edge detector for producing a detection output of the synchronization signal. The synchronization signal may be detected efficiently with a short delay time and by a simple circuit construction even if the synchronization signal pattern is of a longer length. A demodulator utilizing the synchronization signal detector is also disclosed.
    • 用于检测记录在记录介质上的同步信号或帧同步信号的同步信号检测器包括用于将RF信号转换成二值信号的二进制值信号检测器,用于提取二进制值信号的边缘部分的边缘检测电路, 用于对边缘部分之间的外部源产生的时钟数进行计数的计数器,用于在边缘部分之间保持连续时钟计数值并且用于连续移位它们保持的时钟值的多个锁存电路,用于比较数字的值一致电路 在同步模式的转换之间的时钟和由计数器和锁存电路保持的时钟计数值之间的时钟,并且用于在时钟数和时钟计数值之间完全一致的情况下输出指示一致的信号,以及用于采取的AND电路 值符合电路的输出的逻辑和 边缘检测器,用于产生同步信号的检测输出。 即使同步信号图案具有较长的长度,也可以以短的延迟时间和简单的电路结构有效地检测同步信号。 还公开了利用同步信号检测器的解调器。