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1.发明授权Apparatus for reproducing an encoded digital signal based on a frame synchronization signal 失效一种用于基于帧同步信号再现编码数字信号的装置
公开(公告)号：US5572496A
公开(公告)日：1996-11-05
申请号：US455616
申请日：1995-05-31
申请人： Hideki Hayashi , Masaru Umezawa
发明人： Hideki Hayashi , Masaru Umezawa
CPC分类号： G11B27/3027 , H04N5/935
摘要： An encoded digital signal reproducing apparatus in which a read signal from a recording medium is compared with each of thresholds different from each other to generate at least two binary-coded signals. When a first predetermined code train pattern is detected from one of the two binary-coded signals and a second predetermined code train pattern is simultaneously detected from the other of the two binary-coded signals, a frame synchronization detection signal is generated. A data signal is then decoded from the read signal on the basis of the timing at which the frame synchronization detection signal is generated. Thus, the probability of erroneous detection of the frame synchronization signal is reduced even with a high recording density, thus making it possible to correctly detect the frame synchronization signal.
摘要翻译： 一种编码数字信号再现装置，其中将来自记录介质的读取信号与彼此不同的阈值进行比较，以生成至少两个二进制编码信号。 当从两个二进制编码信号中的一个检测到第一预定代码序列模式，并且从两个二进制编码信号中的另一个同时检测到第二预定码序列模式时，产生帧同步检测信号。 然后，根据生成帧同步检测信号的定时，从读取信号对数据信号进行解码。 因此，即使具有高记录密度，帧同步信号的错误检测的概率也降低，从而可以正确地检测帧同步信号。
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2.发明授权Crosstalk canceler with digital filter for producing pseudo crosstalk component 失效串扰消除器与数字滤波器产生伪串扰分量
公开(公告)号：US5790492A
公开(公告)日：1998-08-04
申请号：US839345
申请日：1997-04-18
申请人： Masaru Umezawa , Hideki Hayashi
发明人： Masaru Umezawa , Hideki Hayashi
CPC分类号： G11B20/10101 , G11B20/10009 , G11B20/22 , G11B7/005
摘要： A crosstalk canceler cancels crosstalk components mixed into a reproduced signal of a target track from a first and a second neighboring tracks positioned on both sides of the target track formed on an optical disc. The crosstalk canceler includes: unit for reproducing a signal recorded on the tracks of the optical disc; unit for processing the reproduced signal to produce 1-bit binary data indicating data recorded on the first neighboring track and outputting first binary data; unit for producing a first pseudo crosstalk component which mixes into the reproduced signal of the target track from the first neighboring track based on the first binary data; unit for delaying an output signal corresponding to a pure recorded signal of the track preceding the target track to produce second binary data indicating data recorded on the second neighboring track and outputting second binary data; unit for producing a second pseudo crosstalk component which mixes into the reproduced signal of the target track from the second neighboring track based on the second binary data; and unit for subtracting the first and the second pseudo crosstalk components from the reproduced signal of the target track and outputting a pure recorded signal of the target track.
摘要翻译： 串扰消除器从位于在光盘上形成的目标轨道的两侧的第一和第二相邻轨道抵消混合到目标轨迹的再现信号中的串扰分量。 串扰消除器包括：用于再现记录在光盘的轨道上的信号的单元; 单元，用于处理再现信号以产生指示记录在第一相邻轨道上的数据并输出第一二进制数据的1位二进制数据; 单元，用于产生第一伪串扰分量，其基于所述第一二进制数据从所述第一相邻磁道混合到所述目标磁道的再现信号中; 单元，用于延迟对应于在目标轨道之前的轨道的纯记录信号的输出信号，以产生指示记录在第二相邻轨道上的数据并输出第二二进制数据的第二二进制数据; 用于产生第二伪串扰分量的单元，其基于所述第二二进制数据从所述第二相邻轨道混合到所述目标轨迹的再现信号中; 以及用于从目标轨道的再现信号中减去第一和第二伪串扰分量并输出目标轨道的纯记录信号的单元。
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公开(公告)号：US5742576A
公开(公告)日：1998-04-21
申请号：US663780
申请日：1996-06-14
申请人： Hideki Hayashi , Masaru Umezawa , Hideki Kobayashi
发明人： Hideki Hayashi , Masaru Umezawa , Hideki Kobayashi
CPC分类号： G11B20/1403 , G11B20/10527 , G11B7/005
摘要： A digital signal reproducing apparatus which can reproduce a digital signal by a sampling clock that is accurately synchronized with a phase of a read signal. A sample value near the zero level is extracted from a sample value sequence obtained by sampling the read signal. When a sample value level of the sample value sequence has a rising tendency, a sampling clock whose phase is corrected on the basis of one of the extracted sample value and an inversion extracted sample value obtained by inverting a polarity of the extracted sample value is generated. When the sample value level of the sample value sequence has a falling tendency, a sampling clock whose phase is corrected on the basis of the other one of the extracted sample value and the inversion extracted sample value is generated.
摘要翻译： 数字信号再现装置，其能够通过与读取信号的相位精确同步的采样时钟再现数字信号。 从通过对读取信号进行采样获得的采样值序列中提取接近零电平的采样值。 当采样值序列的采样值电平具有上升趋势时，产生相位根据提取的采样值中的一个校正的采样时钟和通过反转提取的采样值的极性而获得的反转提取采样值的采样时钟 。 当采样值序列的采样值电平具有下降趋势时，产生基于所提取的采样值和反演提取的样本值中的另一个校正相位的采样时钟。
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公开(公告)号：US5995465A
公开(公告)日：1999-11-30
申请号：US949035
申请日：1997-10-10
申请人： Hideki Hayashi , Masaru Umezawa , Hideki Kobayashi
发明人： Hideki Hayashi , Masaru Umezawa , Hideki Kobayashi
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10222 , G11B20/1403 , G11B2220/2562
摘要： A digital signal reproducing apparatus has the clock signal generating device 24 having: a frequency setting device 12 for setting a desired frequency on the basis of the predetermined linear velocity and a radius position of a pickup 1; a first frequency difference signal generating device 242 for generating a binary signal E corresponding to a difference between the desired frequency fsd and the frequency fs of the sample clock signal A to be used for reproducing a reproduction digital signal; a second frequency difference signal generating device 243 for generating a pulse signal L corresponding to a difference between the frequency based on the reproduction digital signal and the frequency fs of the sample clock signal A; a phase difference signal generating device 244 for generating a pulse signal Y corresponding to a difference between the phase based on the reading signal read from the disc and the phase of the sample clock signal A; and a synchronizing device 24 for synchronizing the frequency fs and phase of the sample clock signal A with the frequency of the reading signal on the basis of the binary signal E, the pulse signal L and the pulse signal Y.
摘要翻译： 数字信号再现装置具有：时钟信号发生装置24，具有：频率设定装置12，用于根据预定的线速度和拾取器1的半径位置来设定期望的频率; 第一频率差信号发生装置242，用于产生对应于要用于再现再现数字信号的采样时钟信号A的期望频率fsd和频率fs之间的差的二进制信号E; 第二频率差信号发生装置243，用于产生对应于基于再现数字信号的频率与采样时钟信号A的频率fs之间的差的脉冲信号L. 相位差信号发生装置244，用于基于从盘读取的读取信号和采样时钟信号A的相位产生对应于相位差的脉冲信号Y; 以及同步装置24，用于根据二进制信号E，脉冲信号L和脉冲信号Y使采样时钟信号A的频率fs和相位与读取信号的频率同步。
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公开(公告)号：US5901128A
公开(公告)日：1999-05-04
申请号：US854678
申请日：1997-05-12
申请人： Hideki Hayashi , Hideki Kobayashi , Masaru Umezawa
发明人： Hideki Hayashi , Hideki Kobayashi , Masaru Umezawa
CPC分类号： G11B20/10009 , G11B7/005
摘要： A recorded information reproducing apparatus is capable of highly reliably reproducing information even from a recording medium on which recorded information including recorded signals in a low frequency band are recorded at a high density. An error voltage is subtracted from an analog read signal read from a recording medium to generate a corrected read signal. The corrected read signal is sampled to be converted into a digital corrected read sample sequence from which recorded information is decoded. Here, the sample existing at a position nearest to each zero-cross point in the corrected read sample sequence is extracted from the corrected read sample sequence to generate an extracted sample sequence. Each sample in the extracted sample sequence is converted into an analog signal having a level corresponding to the associated sample value. This analog signal is used as the above error voltage.
摘要翻译： 记录信息再现装置即使从其中以高密度记录包括低频带中的记录信号的记录信息的记录介质也能够高度可靠地再现信息。 从从记录介质读取的模拟读取信号中减去误差电压，以产生校正的读取信号。 校正的读取信号被采样以被转换成数字校正的读取样本序列，从中记录信息被解码。 这里，从校正后的读取样本序列中提取存在于校正后的读取样本序列中最接近每个过零点的位置处的样本，以产生提取的样本序列。 提取的样本序列中的每个样本被转换成具有对应于相关联样本值的水平的模拟信号。 该模拟信号用作上述误差电压。
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公开(公告)号：US5719847A
公开(公告)日：1998-02-17
申请号：US584219
申请日：1996-01-04
CPC分类号： G11B20/20 , G11B20/10009 , G11B7/005 , G11B7/0953
摘要： An optical disk player for compensating a waveform distortion of a read signal which is caused due to a skew in the track tangential direction of an optical disk. An optical disk is constructed in a manner such that a skew amount of the irradiated portion of a recording surface of the optical disk for a light beam irradiated onto the recording surface of the optical disk is detected from the pickup and transmitting characteristics of a read signal generated from the pickup are controlled in accordance with the detected skew amount. A waveform distortion of the read signal due to a warp or distortion existing in the track tangential direction of the optical disk can be compensated and the recording data can be accurately reproduced.
摘要翻译： 一种光盘播放器，用于补偿由于光盘的轨道切线方向上的偏斜而引起的读取信号的波形失真。 光盘被构造成使得从拾取器检测到照射到光盘的记录表面上的光束的光盘的记录表面的照射部分的偏斜量，并且读取信号的发送特性 根据检测到的偏斜量来控制从拾取器产生的。 可以补偿由于存在于光盘的轨道切线方向上的翘曲或失真引起的读取信号的波形失真，并且可以准确地再现记录数据。
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公开(公告)号：US5673211A
公开(公告)日：1997-09-30
申请号：US619298
申请日：1996-03-21
申请人： Hideki Hayashi , Masaru Umezawa
发明人： Hideki Hayashi , Masaru Umezawa
CPC分类号： G11B20/10037 , G11B20/10009 , G11B20/1403 , G11B20/10203
摘要： A digital data reproducing apparatus performs an accurate data decoding by appropriately correcting a phase error as well as a level error in sample values of a read signal. When a sampling value with an absolute value smaller than a specified value is extracted from a sample value series of the read signal successively outputted from an A converter according to a timing of a sampling clock pulse, the value is obtained as an extracted value and also a slant signal indicating a positive or negative sign of a slant in a portion corresponding to the extracted sample value in the sample value series is obtained, and a phase in the sampling clock pulse is corrected according to the extracted sample value as well as the slant signal, and also a level of an output sample value from the A/D converter is corrected according to the extracted sample value, and digital data according to the sample value subjected to the level correction is decoded. With this feature, it is possible to automatically correct a phase in the sampling clock pulse as well as a level of the sample value to their optimal state, so that a high-precision sample value can be obtained, which suppresses increase of any error in decoded data.
摘要翻译： 数字数据再现装置通过适当地校正读取信号的采样值中的相位误差和电平误差来执行精确的数据解码。 当根据采样时钟脉冲的定时从A / D转换器连续输出的读取信号的采样值序列提取具有小于指定值的绝对值的采样值时，获得该值作为提取值 并且获得表示在采样值序列中与提取的采样值相对应的部分中的倾斜的正或负符号的倾斜信号，并且根据提取的样本值来校正采样时钟脉冲中的相位，以及 根据提取的采样值来校正来自A / D转换器的倾斜信号和输出采样值的电平，并且解码根据经过电平校正的采样值的数字数据。 利用该特征，可以将采样时钟脉冲中的相位和采样值的电平自动校正为其最佳状态，从而可以获得高精度的采样值，从而抑制任何误差的增加 解码数据。
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8.发明授权
公开(公告)号：US5663945A
公开(公告)日：1997-09-02
申请号：US571241
申请日：1995-12-12
申请人： Hideki Hayashi , Masaru Umezawa
发明人： Hideki Hayashi , Masaru Umezawa
CPC分类号： G11B20/1403 , H03L7/091 , H03L7/0994 , G11B7/005 , H03L2207/50 , H03L7/093
摘要： A digital PLL circuit in a recording information reproducing apparatus, wherein a sampled value is obtained by A/D converting a read signal read from a recording medium at a sampling timing according to a reproduction clock signal, a phase error occurring in the read signal is detected on the basis of the sampled value, an oscillation data signal sequence whose data value increases or decreases at a changing period corresponding to the phase error is generated, the oscillation data signal sequence is converted to an analog signal, an oscillation signal is formed, and a signal obtained by converting the oscillation signal to a square wave is set to a reproduction clock signal for sampling.
摘要翻译： 一种记录信息再现装置中的数字PLL电路，其中通过根据再现时钟信号在采样定时对从记录介质读取的读取信号进行A / D转换来获得采样值，读取信号中出现的相位误差为 根据采样值进行检测，生成数据值在与相位误差对应的变化期间增减的振荡数据信号序列，将振荡数据信号序列变换为模拟信号，形成振荡信号， 并将通过将振荡信号转换为方波而获得的信号设置为用于采样的再现时钟信号。
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9.发明授权
公开(公告)号：US5444680A
公开(公告)日：1995-08-22
申请号：US196861
申请日：1994-02-15
申请人： Masaru Umezawa , Hiroki Kuribayashi
发明人： Masaru Umezawa , Hiroki Kuribayashi
CPC分类号： G11B20/10222 , G11B20/10009 , G11B20/1426 , G11B7/005
摘要： A digital signal reproducing apparatus which is capable of accurately reproducing a digital signal from a recording medium on which signals are recorded at a high density. A read signal outputted from a pickup is converted into a binary signal which is synchronized to produce a synchronized binary signal. From this synchronized binary signal, a synchronized short pulse binary signal portion is detected which has an inversion interval shorter than a predetermined period and thus may violate a run length limit. The apparatus determines whether the center position on the time base of the short pulse binary signal portion before synchronization is closer to the sampling timing existing immediately before the short pulse binary signal portion or closer to the sampling timing existing immediately after the short pulse binary signal portion. The logic of the synchronized binary signal at the sampling timing determined as being closer is inverted to correct erroneously read data.
摘要翻译： 一种数字信号再现装置，其能够以高密度记录信号的记录介质精确地再现数字信号。 从拾取器输出的读取信号被转换成同步的二进制信号以产生同步的二进制信号。 从该同步的二进制信号中，检测到具有比预定时间段短的反转间隔的同步短脉冲二进制信号部分，从而可能违反游程长度限制。 该装置确定在同步之前的短脉冲二进制信号部分的时基上的中心位置是否更接近于短脉冲二进制信号部分之前存在的采样定时，或更接近短脉冲二进制信号部分之后存在的采样定时 。 确定为更接近的采样定时处的同步二进制信号的逻辑被反转以校正错误读取的数据。
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