公开(公告)号：US06285640B1

公开(公告)日：2001-09-04

申请号：US09356355

申请日：1999-07-19

申请人： Yasuhiro Hayashi ,  Kouichi Mitani

发明人： Yasuhiro Hayashi ,  Kouichi Mitani

IPC分类号： G11B700

CPC分类号： G11B20/1403 ,  G11B2020/10916 ,  H03L7/0995 ,  H03L7/113 ,  H03L2207/06

摘要： This invention prepares two control voltage to be input to a VCO circuit. The first control voltage is used to continuously change the oscillation frequency of the VCO circuit. The second control voltage is used to continuously change the first control voltage/oscillation frequency characteristics. The invention also includes a phase detecting circuit for comparing the phase of the data read from a disk with that of the output from the voltage-controlled oscillator, a frequency detecting circuit for comparing the frequency of the data read from the disk with that of the output from the voltage-controlled oscillator, a first filter circuit for equalizing signals representing the detection results obtained by the phase detecting circuit and the frequency detecting circuit, and a second filter circuit for extracting only a low-frequency component from the output from the first filter circuit. The output from the first filter circuit is used as the first control voltage. The output from the second filter circuit is used as the second control voltage. The second control voltage is changed to always keep the first control voltage at a predetermined voltage.

公开(公告)号：US06496470B2

公开(公告)日：2002-12-17

申请号：US09904496

申请日：2001-07-16

申请人： Yasuhiro Hayashi ,  Kouichi Mitani

发明人： Yasuhiro Hayashi ,  Kouichi Mitani

IPC分类号： G11B700

CPC分类号： G11B20/1403 ,  G11B2020/10916 ,  H03L7/0995 ,  H03L7/113 ,  H03L2207/06

摘要： This invention prepares two control voltage to be input to a VCO circuit. The first control voltage is used to continuously change the oscillation frequency of the VCO circuit. The second control voltage is used to continuously change the first control voltage/oscillation frequency characteristics. The invention also includes a phase detecting circuit for comparing the phase of the data read from a disk with that of the output from the voltage-controlled oscillator, a frequency detecting circuit for comparing the frequency of the data read from the disk with that of the output from the voltage-controlled oscillator, a first filter circuit for equalizing signals representing the detection results obtained by the phase detecting circuit and the frequency detecting circuit, and a second filter circuit for extracting only a low-frequency component from the output from the first filter circuit. The output from the first filter circuit is used as the first control voltage. The output from the second filter circuit is used as the second control voltage. The second control voltage is changed to always keep the first control voltage at a predetermined voltage.

摘要翻译： 本发明准备两个控制电压输入到VCO电路。 第一控制电压用于连续改变VCO电路的振荡频率。 第二控制电压用于连续改变第一控制电压/振荡频率特性。 本发明还包括一个相位检测电路，用于比较从磁盘读取的数据的相位与来自压控振荡器的输出的数据的相位;频率检测电路，用于将从磁盘读取的数据的频率与 来自压控振荡器的输出，用于对表示由相位检测电路和频率检测电路获得的检测结果的信号进行均衡的第一滤波器电路和用于从第一滤波器的输出中仅提取低频分量的第二滤波器电路 滤波电路。 第一滤波电路的输出用作第一控制电压。 第二滤波电路的输出用作第二控制电压。 第二控制电压被改变为始终将第一控制电压保持在预定电压。

公开(公告)号：US5982724A

公开(公告)日：1999-11-09

申请号：US886541

申请日：1997-07-01

申请人： Yasuhiro Hayashi ,  Kouichi Mitani

发明人： Yasuhiro Hayashi ,  Kouichi Mitani

IPC分类号： G11B19/28 ,  G11B20/14 ,  H03L7/099 ,  H03L7/113 ,  G11B7/00

CPC分类号： G11B20/1403 ,  H03L7/0995 ,  H03L7/113 ,  G11B2020/10916 ,  H03L2207/06

摘要： This invention prepares two control voltage to be input to a VCO circuit. The first control voltage is used to continuously change the oscillation frequency of the VCO circuit. The second control voltage is used to continuously change the first control voltage/oscillation frequency characteristics. The invention also includes a phase detecting circuit for comparing the phase of the data read from a disk with that of the output from the voltage-controlled oscillator, a frequency detecting circuit for comparing the frequency of the data read from the disk with that of the output from the voltage-controlled oscillator, a first filter circuit for passing signals representing the detection results obtained by the phase detecting circuit and the frequency detecting circuit, and a second filter circuit for extracting only a low-frequency component from the output from the first filter circuit. The output from the first filter circuit is used as the first control voltage. The output from the second filter circuit is used as the second control voltage. The second control voltage is changed to always keep the first control voltage at a predetermined voltage.

摘要翻译： 本发明准备两个控制电压输入到VCO电路。 第一控制电压用于连续改变VCO电路的振荡频率。 第二控制电压用于连续改变第一控制电压/振荡频率特性。 本发明还包括一个相位检测电路，用于比较从磁盘读取的数据的相位与来自压控振荡器的输出的数据的相位;频率检测电路，用于将从磁盘读取的数据的频率与 从压控振荡器输出的第一滤波器电路，用于传递表示由相位检测电路和频率检测电路获得的检测结果的信号的第一滤波器电路，以及用于从第一滤波器的输出仅提取低频分量的第二滤波器电路 滤波电路。 第一滤波电路的输出用作第一控制电压。 第二滤波电路的输出用作第二控制电压。 第二控制电压被改变为始终将第一控制电压保持在预定电压。