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11. 发明专利

JP2004086994A Recording and reproducing device having burst error replacement means, and method for replacing burst error 有权
标题翻译：具有爆裂误差更换装置的记录和再现装置以及更换爆发误差的方法
公开(公告)号：JP2004086994A
公开(公告)日：2004-03-18
申请号：JP2002246841
申请日：2002-08-27
申请人： Fujitsu Ltd , 富士通株式会社
发明人： TAGUCHI MASAKAZU , ITAKURA AKIHIRO
IPC分类号： G11B20/10 , G11B20/18 , H03M13/45
CPC分类号： G11B20/10055 , G11B20/10009
摘要： PROBLEM TO BE SOLVED: To provide a data recording and reproducing device using iterative decoding which can demodulate data correctly even when a burst error signal is included in a reproduced signal, and can obtain effect of error correction by iterative decoding sufficiently even for the burst error signal.
SOLUTION: In the recording and reproducing device which records and reproduces a recording signal in which data are encoded by convolution codes through a partial response channel and performs the reproducing of the data from the reproduced signal by using iterative decoding using likelihood information, the data recording and reproducing device is attained by a recording and reproducing device which is characterized by being provided with a burst error detecting means for detecting a burst error part in the reproduced signal and a replacement means for replacing sampled values included in the error part to prescribed values according to the detected result of the detecting means.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：为了提供使用迭代解码的数据记录和再现装置，即使在再现信号中包括突发错误信号也能正确地解调数据，并且可以通过迭代解码获得对纠错的影响，甚至对于突发错误信号。解决方案：在记录和再现记录信号的记录和再现装置中，其中通过部分响应信道通过卷积码对数据进行编码，并通过使用似然信息的迭代解码从再生信号中再现数据，数据记录和再现装置由记录和再现装置实现，该记录和再现装置的特征在于设置有用于检测再现信号中的突发错误部分的突发错误检测装置和用于将包括在错误部分中的采样值替换为根据检测装置的检测结果设定规定值。版权所有（C）2004，JPO

12. 发明专利

JP2003006993A Data reproducing device and data recording/reproducing device 审中-公开
标题翻译：数据再现设备和数据记录/再现设备
公开(公告)号：JP2003006993A
公开(公告)日：2003-01-10
申请号：JP2001191676
申请日：2001-06-25
申请人： Fujitsu Ltd , 富士通株式会社
发明人： ITAKURA AKIHIRO
IPC分类号： G11B7/004 , G11B20/10 , G11B20/18 , H03M13/29
CPC分类号： H03M13/2975 , G11B20/10 , G11B20/18 , H03M13/2957 , H03M13/35 , H03M13/6331 , H03M13/6343 , H03M13/6362 , H03M13/658
摘要： PROBLEM TO BE SOLVED: To provide a data recording/reproducing device capable of reproducing data with a small number of errors in any recording media. SOLUTION: The data reproducing device for generating decoding data based on a reproducing signal from a recording medium in accordance with a repeated decoding method corresponding to a turbo encoding method is provided with a constant value control means for controlling the value of a communication line constant used in the repeated decoding process when decoding data is generated by the repeated decoding method.
摘要翻译：要解决的问题：提供能够在任何记录介质中再现少量错误的数据的数据记录/再现装置。解决方案：根据与turbo编码方法对应的重复解码方法，根据来自记录介质的再现信号产生解码数据的数据再现装置设置有常数值控制装置，用于控制所使用的通信线路常数的值在通过重复解码方法生成解码数据时的重复解码处理。

13. 发明专利

JPH1097744A INFORMATION RECORDING METHOD OF OPTICAL RECORDING MEDIUM AND INFORMATION RECORDING DEVICE 失效
公开(公告)号：JPH1097744A
公开(公告)日：1998-04-14
申请号：JP25067096
申请日：1996-09-20
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO , TAGUCHI MASAKAZU
IPC分类号： G11B11/10 , G11B7/00 , G11B7/0045 , G11B7/125 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To provide an information recording method by which shift of a front edge of a recording mark can be prevented. SOLUTION: Recorded data is inputted to a coder 11, and code-modulated. The modulated code is given to a control section 13, and a DSV value is calculated during the prescrijbed period. When the DSV value exceeds the prescribed value, it is judged that heat accumulation is large and a front edge of a recorded mark is affected, current values of each current sources 15a-15d are changed and set so that a power value of a laser beam is made low. The next recorded mark is formed with low power values, thereby, shift of a front edge is prevented.

14. 发明专利

JP2000348351A OPTICAL DISK RECORDING MEDIUM, ITS TILT DETECTING METHOD AND DETECTOR, AND RECORDING/REPRODUCING DEVICE 失效
公开(公告)号：JP2000348351A
公开(公告)日：2000-12-15
申请号：JP16207599
申请日：1999-06-09
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO
IPC分类号： G11B7/24 , G11B7/007
摘要： PROBLEM TO BE SOLVED: To obtain a tilt detecting method and a detector therefor facilitating the manufacture of the optical disk recording medium and to obtain the optical disk recording medium realizing this detecting method. SOLUTION: On the optical disk recording medium, a 1st wobble area WA formed on one of the left side or right side of a track and a 2nd wobble area WB formed on another side are arranged so that they are shifted back and forth relative to each other along the information recording track constituted of the land part L or groove part G. When the amplitude ratio L1/L2 of tracking error signals obtained from the 1st and 2nd wobble area WA, WB on the land part L and the amplitude ratio G1/G2 of tracking error signals obtained from the 1st and 2nd wobble areas WA, WB on the groove part G are equal, the tilt is judged as zero. Also, the correction of tilt is made so as to be L1/L2=G1/G2.

15. 发明专利

JPH08241524A METHOD AND DEVICE FOR REPRODUCING OPTICAL RECORDING MEDIUM 失效
公开(公告)号：JPH08241524A
公开(公告)日：1996-09-17
申请号：JP4301995
申请日：1995-03-02
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO , MATSUURA MICHIO , IZUMI HARUHIKO
IPC分类号： G11B7/00 , G11B7/005
摘要： PURPOSE: To obtain a method and device for surely reproducing even for an optical recording medium recorded with high density. CONSTITUTION: A pit 2 is formed on a land 4 of an optical disk 1. Reflected light reflected by the optical disk 1 is reflected by a beam splitter 8, and is made incident on a photodetector 10 to be detected. The photodetectors 11 are arranged on both sides of an objective lens 9 in the direction of a track while inclining at a prescribed angle a piece each, and the reflected light rotation angel of which is large and returning to no objective lens 9 is made incident on the photodetectors 11 to be detected. The output signals of two photodetectors 11 and the output signal of the photodetector 10 are added by an adder 12, and the sum signal is imparted to a signal processing circuit 13 to be processed to form a proper signal such as an audio signal, or a video signal.

16. 发明专利

JP2003223764A DATA REPRODUCING DEVICE 审中-公开
公开(公告)号：JP2003223764A
公开(公告)日：2003-08-08
申请号：JP2002016136
申请日：2002-01-24
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO
IPC分类号： G11B20/10 , G11B20/18 , H03M13/29
摘要： PROBLEM TO BE SOLVED: To provide a data reproducing device that can decode the data correctly while suppressing the drop of the transfer rate. SOLUTION: In a data reproducing device that generates decoded data by applying a decoding process to the reproduced signals from a recording medium according to the repetitive decoding matching the turbo encoding and reproduces the recorded data by applying predetermined error correction to the above decoded data, the data reproducing device has an error detector (48) to detect errors in the above decoded data, a first decision means (48, S2) to decide whether it is possible or not to correct the errors detected by the above detector (48), and a decoding controller (48, S3) to stop the above decoding process when it is possible. COPYRIGHT: (C)2003,JPO

17. 发明专利

JP2002157842A DATA REPRODUCING DEVICE 失效
公开(公告)号：JP2002157842A
公开(公告)日：2002-05-31
申请号：JP2000354915
申请日：2000-11-21
申请人： FUJITSU LTD
发明人： TAGUCHI MASAKAZU , ITAKURA AKIHIRO , UCHIDA AKIYOSHI
IPC分类号： H04N5/92 , G11B5/008 , G11B5/012 , G11B7/00 , G11B20/10 , G11B20/14
摘要： PROBLEM TO BE SOLVED: To provide such a data reproducing device as is capable of processing data detection based on read data without being restricted by reading processing without deteriorating the format efficiency of recorded data. SOLUTION: The data reproducing device which samples a reproducing signal from the recorded data in a recording medium synchronizing with the first clock signal and reproduces the recorded data based on the sample value has a store means for storing the sample values in order and a data detection processing means which fetches a sample value from the storage means in synchronization with the second clock signal different from the first clock signal and processes the fetched sample value in accordance with a prescribed algorithm to detect data. Thus, the data reproducing device reproduces the recorded data based on detected data obtained by the data detection processing means.

18. 发明专利

JP2000173194A PLL CIRCUIT, PLL CIRCUIT CONTROLLER AND DISK DEVICE 失效
公开(公告)号：JP2000173194A
公开(公告)日：2000-06-23
申请号：JP35125798
申请日：1998-12-10
申请人： FUJITSU LTD , FUJITSU VLSI LTD
发明人： NIWA TAKAHIRO , ITAKURA AKIHIRO
IPC分类号： G11B20/14 , H03L7/08 , H03L7/089 , H03L7/14 , H03L7/191
摘要： PROBLEM TO BE SOLVED: To provide a PLL circuit normally generating an output signal even when a noise is incorporated in a reference signal, and the pulse of the reference signal is lacked. SOLUTION: The PLL circuit 19 is provided with a period information generative circuit 37 and a control circuit 31. The period information generative circuit 37 generates a period information signal (k) of a prescribed period containing the period that the reference signal RC rises next is estimated by counting an output signal CLK. The control circuit 31 generates the next output signal CLK based on the reference signal RC when the reference signal rises in the prescribed period based on the period information signal (k), and inactivates a phase comparator 32 when the reference signal RC does not rise in the prescribed period to keep the generated output signal CLK.

19. 发明专利

JPH10302319A OPTICAL RECORDING MEDIUM, TILT DETECTOR, OPTICAL DISK DEVICE TILT DETECTING METHOD AND TILT CORRECTING METHOD 失效
公开(公告)号：JPH10302319A
公开(公告)日：1998-11-13
申请号：JP10792397
申请日：1997-04-24
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO , MATSUURA MICHIO
IPC分类号： G11B7/24 , G11B7/007 , G11B7/09 , G11B7/095 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To eliminate the necessity of a complex tilt detecting mechanism by providing a land section or groove section adjacent to each other in both sides of each of a plurality of positions of two tracks with a portion where the center line of a track direction is displaced. SOLUTION: A position detection circuit detects a tilt detecting position P by means of a data signal obtained from an optical head and notifies it to a tilt detection circuit. This tilt detecting position P displaces the center position of only a groove G or a land L in both sides of a traveling track 7 and changes the space frequency of the traveling track. On the other hand, a tilt correction circuit corrects, on the mirror surface of an optical recording medium, a tilt amount detected by the tilt detection circuit based on a tracking error signal outputted from a tracking error detection circuit. An offset amount proportional to the detected tilt amount is forcibly corrected by an off-track correction circuit and thus, even when there is tilting, the center of spot intensity is maintained around a track.

20. 发明专利

JPH0991788A MAGNETO-OPTICAL RECORDING METHOD AND DEVICE THEREFOR 失效
公开(公告)号：JPH0991788A
公开(公告)日：1997-04-04
申请号：JP24023195
申请日：1995-09-19
申请人： FUJITSU LTD
发明人： ITAKURA AKIHIRO , IZUMI HARUHIKO
IPC分类号： G11B11/10 , G11B7/00 , G11B7/0045 , G11B11/105
摘要： PROBLEM TO BE SOLVED: To obtain a device capable of suppressing the shift and jitter of the front side edge of a recording mark and capable of a high density recording by respectively making light powers in a mark forming area and a space forming area prescribed pulse trains. SOLUTION: A light power is respectively raised from a bottom power Pb to a first writing power Pw1 and fallen to a second writing power Pw2 after 3.1/2sec, (Pw1 >Pw2 ). Thereafter, the light power is made to be a power train in which the power Pw1 and the power Pw2 are made to be alternated in accordance with a clock cycle. Then, the light power is fallen from the power Pw1 to the power Pb and enters into the space forming area while maintaining it as it is. In this area, the light power is made to be elapsed for T time while maintaining the power Pb as it is and thereafter, the power is made to be a pulse train in which the power Pb and a power Pa (Pa >Pb ) are made to be alternately repeated in accordance with the clock cycle.

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