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1. 发明授权

US07508741B2 Optical disc recording and reproduction apparatus having automatic gate signal generation modes 失效
标题翻译：具有自动门信号生成模式的光盘记录和再现装置
公开(公告)号：US07508741B2
公开(公告)日：2009-03-24
申请号：US11641886
申请日：2006-12-20
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B15/02
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

2. 发明申请

US20080037388A1 Optical disc recording and reproduction apparatus having automatic gate signal generation modes 有权
标题翻译：具有自动门信号生成模式的光盘记录和再现装置
公开(公告)号：US20080037388A1
公开(公告)日：2008-02-14
申请号：US11798713
申请日：2007-05-16
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B7/00
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

3. 发明授权

US07292510B2 Optical disc recording and reproduction apparatus having automatic gate signal generation modes 失效
公开(公告)号：US07292510B2
公开(公告)日：2007-11-06
申请号：US11035272
申请日：2005-01-14
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B7/00
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.

4. 发明授权

US07768891B2 Optical disc recording and reproduction apparatus having automatic gate signal generation modes 有权
标题翻译：具有自动门信号生成模式的光盘记录和再现装置
公开(公告)号：US07768891B2
公开(公告)日：2010-08-03
申请号：US11798713
申请日：2007-05-16
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B11/00
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

5. 发明申请

US20090147641A1 Optical disc recording and reproducing apparatus 审中-公开
公开(公告)号：US20090147641A1
公开(公告)日：2009-06-11
申请号：US12320774
申请日：2009-02-04
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B7/00
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.

6. 发明授权

US06459667B1 Optical disc recording and reproducing apparatus having automatic gate signal generation modes 有权
标题翻译：具有自动门信号产生模式的光盘记录和再现装置
公开(公告)号：US06459667B1
公开(公告)日：2002-10-01
申请号：US09206953
申请日：1998-12-08
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B509
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

7. 发明授权

US07515512B2 Optical disc recording and reproduction apparatus 失效
标题翻译：光盘记录和再现装置
公开(公告)号：US07515512B2
公开(公告)日：2009-04-07
申请号：US11377189
申请日：2006-03-17
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B15/02
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

8. 发明申请

US20070091748A1 Optical disc recording and reproduction apparatus having automatic gate signal generation modes 失效
标题翻译：具有自动门信号生成模式的光盘记录和再现装置
公开(公告)号：US20070091748A1
公开(公告)日：2007-04-26
申请号：US11641886
申请日：2006-12-20
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B5/09
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

9. 发明申请

US20060245319A1 OPTICAL DISC RECORDING AND REPRODUCTION APPARATUS 失效
标题翻译：光盘记录和再现设备
公开(公告)号：US20060245319A1
公开(公告)日：2006-11-02
申请号：US11377189
申请日：2006-03-17
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B19/02
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.
摘要翻译：一种用于通过使用光盘作为记录介质来记录和从光盘再现数据的光盘记录和再现装置，包括模拟处理装置，包括用于对从光盘读取的信号进行二值化的二值化单元，以及用于控制在光盘中记录和再现信号的伺服单元; 同步时钟发生装置，用于产生与从光盘读取的信号同步的同步时钟信号; 地址检测装置，用于基于从光盘读取的信号检测表示光盘上的物理位置的地址信息，并且当检测到地址信息时，输出指示地址信息的信号和指示已经检测到地址的信号 ; 用于将光盘的扇区计数值保持为记录单位的扇区计数器，并根据同步时钟信号和从地址检测装置输出的信号来更新扇区计数值; 以及门信号产生切换装置，用于根据表示地址已经被信号的信号，基于扇区计数器中保存的扇区计数值和从模拟处理装置获得的信息，产生控制模拟处理装置的信号从地址检测装置输出。

10. 发明授权

US06643235B2 Optical disc recording and reproducing apparatus having automatic gate signal generation modes 失效
公开(公告)号：US06643235B2
公开(公告)日：2003-11-04
申请号：US10218409
申请日：2002-08-15
申请人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
发明人： Yukio Iijima , Nobuaki Minakuchi , Hidemi Takahashi , Yasushi Ueda , Makoto Okazaki
IPC分类号： G11B509
CPC分类号： G11B19/04 , G11B7/0037 , G11B7/0053 , G11B7/00745 , G11B19/122 , G11B20/10 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/1426 , G11B27/19 , G11B27/24 , G11B27/3027 , G11B2020/10888 , G11B2020/1269 , G11B2020/1274 , G11B2220/20 , G11B2220/2537
摘要： An optical disc recording and reproducing apparatus for recording and reproducing data in and from an optical disc by the use of the optical disc as a recording medium, comprises analog processing means including a binarization unit for subjecting a signal read from the optical disc to binarization and a servo unit for controlling recording and reproducing a signal in and from the optical disc; synchronous clock generating means for generating a synchronous clock signal which is synchronized with the signal read from the optical disc; address detecting means for detecting address information indicating a physical position on the optical disc based on the signal read from the optical disc, and outputting a signal indicating the address information and a signal indicating that the address has been detected when the address information has been detected; a sector counter for holding a sector count value of a sector as a recording unit on the optical disc, and updating the sector count value according to the synchronous clock signal and the signal output from the address detecting means; and gate signal generation switching means for generating gate a signal which controls the analog processing means, based on one of the sector count value held in the sector counter and information obtained from the analog processing means, according to the signal indicating that the address has been detected, which is output from the address detecting means.

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