公开(公告)号：US06307822B1

公开(公告)日：2001-10-23

申请号：US09443155

申请日：1999-11-18

申请人： Jae-Seong Shim ,  Yong-Kwang Won ,  Hyun-Soo Park ,  Il-Kwan Kim

发明人： Jae-Seong Shim ,  Yong-Kwang Won ,  Hyun-Soo Park ,  Il-Kwan Kim

IPC分类号： G11B509

CPC分类号： G11B20/10009 ,  G11B20/1426

摘要： A data reproduction apparatus for an optical disc system is provided. Included is an analog-to-digital converter (ADC) for sampling an input RF signal and outputting the sampled result, an adder for adding the sampled signal and an asymmetry correction signal. The added signal is output. A blank/defect detector is provided for generating a blank detection signal if no change in data is detected from the added signal during a predetermined interval of time. A correction signal generator is provided for calculating a digital sum value (DSV) from the received added signal, generating an asymmetry correction signal based on the calculated DSV, and outputting the generated asymmetry correction signal to the adder. A waveform equalizer is provided for waveform-equalizing the added signal. A decoder is provided for decoding the waveform-equalized signal and outputting the result. The correction signal corrector temporarily stops a DSV calculation operation with respect to the interval of the corresponding added signal, if the blank detection signal is output. Thus, an asymmetry of the RF signal is corrected to enhance quality of the reproduced data.

摘要翻译： 提供了一种用于光盘系统的数据再现装置。 包括用于对输入RF信号进行采样并输出采样结果的模数转换器（ADC），用于将采样信号相加的加法器和不对称校正信号。 添加的信号被输出。 提供空白/缺陷检测器，用于在预定的时间间隔期间，如果在添加的信号中没有检测到数据变化，则产生空白检测信号。 提供校正信号发生器，用于根据接收到的加法信号计算数字和值（DSV），基于所计算的DSV产生不对称校正信号，并将所生成的不对称校正信号输出到加法器。 提供了波形均衡器，用于对添加的信号进行波形均衡。 提供解码器，用于对波形均衡的信号进行解码并输出结果。 如果输出空白检测信号，则校正信号校正器临时停止关于相应的相加信号的间隔的DSV计算操作。 因此，校正RF信号的不对称性以提高再现数据的质量。

公开(公告)号：US06580775B1

公开(公告)日：2003-06-17

申请号：US09449735

申请日：1999-11-26

申请人： Hyun-Soo Park ,  Jae-Seong Shim ,  Yong-Kwang Won

发明人： Hyun-Soo Park ,  Jae-Seong Shim ,  Yong-Kwang Won

IPC分类号： H03D324

CPC分类号： H03L7/091 ,  G01R23/10 ,  G11B20/1403 ,  H03L7/113

摘要： A method of detecting a frequency of a digital phase locked loop in an optical disc reproduction and/or recording apparatus, which includes (a) detecting an edge point of an input signal, (b) sampling a previous and following input signal on the basis of the detected edge point into a predetermined frequency, (c) counting a number of reference clock signals between the detected edge point and a sample which is positioned previously, adding a count value and an interval of time corresponding to the count value to obtain a frequency count value at the edge point, and (e) comparing the obtained frequency count value with a predetermined reference value, to enhance the frequency according to the comparison result can detect frequency having high resolution with only a reference clock frequency without heightening a frequency of a reference clock signal, to thereby enhance the quality of data. The frequency having the high resolution with only the reference clock frequency without heightening the frequency of the reference clock signal is detected, to thereby enhance the quality of data.

摘要翻译： 一种在光盘再现和/或记录装置中检测数字锁相环的频率的方法，包括：（a）检测输入信号的边沿点，（b）基于上述和之后的输入信号进行采样 （c）计数检测到的边缘点与先前位于的样本之间的参考时钟信号的数量，增加与计数值相对应的计数值和时间间隔，以获得 在边缘点处的频率计数值，以及（e）将获得的频率计数值与预定参考值进行比较，以根据比较结果增强频率，可以仅利用参考时钟频率来检测具有高分辨率的频率，而不增加频率 一个参考时钟信号，从而提高数据的质量。 检测到仅具有参考时钟频率的高分辨率的频率而不增加参考时钟信号的频率，从而提高数据的质量。

公开(公告)号：US06324144B1

公开(公告)日：2001-11-27

申请号：US09443150

申请日：1999-11-18

申请人： Yong-Kwang Won ,  Jae-Seong Shim

发明人： Yong-Kwang Won ,  Jae-Seong Shim

IPC分类号： G11B700

CPC分类号： G11B20/10203 ,  G11B20/10037

摘要： An apparatus for correcting asymmetry existing in a reproduction signal corrects the asymmetry by signal-processing the reproduction signal from an optical disk in digital form. The asymmetry correction apparatus changes the threshold values for counting the sign bits of the reproduction signal and the asymmetry correction values although discontinuous intervals exist on the optical disc, thereby providing an effect of easily varying an adaptive speed with respect to the discontinuous signal.

摘要翻译： 用于校正再现信号中存在的不对称的装置通过以数字形式对来自光盘的再现信号进行信号处理来校正不对称性。 不对称校正装置改变用于计数再现信号的符号位的阈值和不对称校正值，尽管在光盘上存在不连续的间隔，从而提供相对于不连续信号容易地改变自适应速度的效果。