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1. 发明专利

JP2002015520A ERROR CORRECTION METHOD AND INFORMATION-REPRODUCING DEVICE 失效
公开(公告)号：JP2002015520A
公开(公告)日：2002-01-18
申请号：JP2000194175
申请日：2000-06-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKAHASHI TOSHIHIKO , HONDA YASUHIRO
IPC分类号： G11B20/10 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To solve the problem that conventionally reproduction performance of signal is deteriorated, when signal processing is performed in the state where signals contain unnecessary pulses generated in reproduced signals by noises, distortions of input signals or the like. SOLUTION: The device has a signal interval detecting means for detecting an interval between pulses obtained by pulsing an inputted analog signal with a pulsing means 1 from pulses included in a pulsed output 101, and an extra pulse removing means 22 which removes a pulse in a location giving a pulse interval shorter than a specified time τ1 from that of the pulsed output 101 for a specific time by using an output 102 of a pulse interval comparison means 12 which gives the location of a pulse having τ1 or longer of the pulse interval of the pulsed output 101 for a specified time from two pulsed signals of a pulse- generating means, which generates a pulse having a width of a fixed interval with respect to the input of the pulse from the pulsed output 101. Signals, generated at timing of a fixed signal interval or shorter, are removed to correct errors.

2. 发明专利

JP2002015422A OPTICAL DISK DEVICE 失效
公开(公告)号：JP2002015422A
公开(公告)日：2002-01-18
申请号：JP2001122943
申请日：2001-04-20
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KONISHI SHINICHI , NAKAJIMA TAKESHI , MIYASHITA SEIJUN , TAKAHASHI TOSHIHIKO , AKAGI TOSHIYA , KUMON YUJI , YAMAZAKI YUKIHIRO
IPC分类号： G11B7/004 , G11B7/005
摘要： PROBLEM TO BE SOLVED: To provide an optical disk device capable of being used for both of the disk continuously to record data or the disk of sector format, and also capable of reproducing the data with the lesser error resultantly by the quick recovery of the reproduced signal after passing the scratched part even through such scratch, etc., are stuck on the disk. SOLUTION: The optical disk device is provided with a detection signal producing part for detecting the fluctuation of a DC level of the reproduction signal read out from the optical disk to produce the detection signal following this fluctuation, a selection part for receiving the detection signal produced by the detection signal producing part to select either one of this detection signal or a non-signal having no effective polarity, and a signal processing part for carrying out the specified signal process in accordance with a clamp part and the output of the clam part such as performing the clamp process to suppress the fluctuation of the DC level of the reproduced signal on the basis of the detection signal when the signal selected by the selection part is the detection signal while not performing the clamp process when the signal selected by the selection part is the non-signal.

3. 发明专利

JPH09153221A INFORMATION RECORDER, AND INFORMATION RECORDING MEDIUM AS WELL AS RECORDING METHOD 失效
公开(公告)号：JPH09153221A
公开(公告)日：1997-06-10
申请号：JP25251696
申请日：1996-09-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKAHASHI TOSHIHIKO , OKAZAKI YUKINORI
IPC分类号： G11B7/00 , G11B7/004
摘要： PROBLEM TO BE SOLVED: To make high-density recording of recording information possible by using a recording and reproducing system having an excellent characteristic to crosstalks by switching the recording polarities of information bits between adjacent tracks, thereby narrowing track pitches. SOLUTION: The reflected light from a recording medium 1009 is detected by a photodetector 1015 and is subjected to signal amplification and waveform shaping in analog signal processing 1001 and the signal is supplied to land/ groove detection 1003 and reproduction polarity switch 1002. The difference in the land/groove is detected by land/groove detection 1003 and a polarity switch command signal 1301 is outputted. The recording signal modulated by recording pulse modulation 1005 is inverted in the polarities by a polarity switch 1004 and is recorded through a laser drive 1006 at the time of recording. The reproduced signal is switched in the polarities in reproduction polarity switch 1002 by the polarity switch command signal 1301, by which the reproduction of the data is executed at the time of reproduction.

4. 发明专利

JP2004326952A Information storing and reproducing device 审中-公开
公开(公告)号：JP2004326952A
公开(公告)日：2004-11-18
申请号：JP2003121655
申请日：2003-04-25
申请人： Matsushita Electric Ind Co Ltd , 松下電器産業株式会社
发明人： TAKAHASHI TOSHIHIKO , AIDA KAZUTOSHI , OGURA YOICHI
IPC分类号： G11B20/10 , G11B5/027 , G11B5/09 , G11B20/14
CPC分类号： G11B5/09 , G11B5/027 , G11B20/10009
摘要： PROBLEM TO BE SOLVED: To efficiently equalize the waveform of an analog signal with large amplitude difference without increasing the circuit scale even while using a digital equalizer.
SOLUTION: An optical disk drive being an information storing and reproducing device has an A/D converter 14 for converting the analog signal A1 into a first digital signal D1 by sampling the analog signal A1 subjected to offset adjustment with an integer multiple frequency that is two or more than a channel clock and outputting the first digital signal D1, and the digital equalizer 15 for digitally equalizing the waveform of a reproduced signal converted into the first digital signal D1 and outputting a second digital signal D2. Since waveform equalization is applied to the digital signal that has been subjected to A/D conversion in this way, the circuit scale can be made small, and since oversampling is performed, resolution at the time of A/D conversion can be equivalently improved.
COPYRIGHT: (C)2005,JPO&NCIPI

5. 发明专利

JP2004213870A Address reproduction circuit, optical disk drive, and address reproduction method 审中-公开
公开(公告)号：JP2004213870A
公开(公告)日：2004-07-29
申请号：JP2003420205
申请日：2003-12-17
申请人： Matsushita Electric Ind Co Ltd , 松下電器産業株式会社
发明人： NAKAJIMA TAKESHI , MIYASHITA SEIJUN , KIMURA NAOHIRO , TAKAHASHI TOSHIHIKO , ISHII TAKAFUMI
IPC分类号： G11B20/14 , G11B7/005 , G11B20/18
摘要： PROBLEM TO BE SOLVED: To reproduce address information with high reliability even when the quality of wobble signal deteriorates. SOLUTION: An address reproduction circuit of this invention is an address reproducing circuit for reproducing the address information on the basis of a reproduced signal read from an optical disk provided with a guide groove having a wobbling shape showing modulated address information. The address reproduction circuit is provided with an A/D conversion part for converting an analog wobble signal included in the reproduced signal into a digital wobble signal and a maximum likelihood decoding part for generating an address signal showing address information having maximum likelihood from the digital wobble signal on the basis of a state transition rule defined by the modulation rule of the modulated address information. COPYRIGHT: (C)2004,JPO&NCIPI

6. 发明专利

JP2004048707A Automatic gain control apparatus and automatic gain control method 有权
公开(公告)号：JP2004048707A
公开(公告)日：2004-02-12
申请号：JP2003133398
申请日：2003-05-12
申请人： Matsushita Electric Ind Co Ltd , 松下電器産業株式会社
发明人： TAKAHASHI TOSHIHIKO
IPC分类号： G11B20/10 , H03G3/00
摘要： PROBLEM TO BE SOLVED: To provide an automatic gain control apparatus and an automatic gain control method in which automatic gain control (AGC) is applied to a plurality of CAPA signals having different signal characteristics. SOLUTION: The automatic gain control apparatus is provided with a VGA 11 for amplifying an amplitude of an input analog signal having a plurality of CAPA having the different signal characteristics with a gain; an A/D converting means 12 for sampling an output of the VGA 11 into a digital signal and sampling the digital signal; a signal discriminating means 17 for detecting a signal length of the digital signal; an amplitude information extracting means 13 for extracting amplitude information of a digital signal of a desired signal length based upon the detected signal length and a control gate 16 inputted from the outside; an AGC means 14 for generating a control signal for controlling the VGA 11 based upon the amplitude information; and a D/A converting means 15 for converting the control signal into an analog signal and outputting it to the VGA 11. COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2001250341A ASYMMETRY DETECTING DEVICE, JITTER DETECTING DEVICE AND RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JP2001250341A
公开(公告)日：2001-09-14
申请号：JP2000392982
申请日：2000-12-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKAJIMA TAKESHI , KONISHI SHINICHI , MIYASHITA SEIJUN , TAKAHASHI TOSHIHIKO
IPC分类号： G11B20/14 , G11B7/004 , H04L7/033
摘要： PROBLEM TO BE SOLVED: To detect the jitters and asymmetry of regenerative signals by using sampled data. SOLUTION: The asymmetry detecting device has a clock former which forms a clock signal in accordance with the regenerative signals, an analog-to- digital converter which samples the regenerative signals in synchronization with the clock signal, a decider which decides whether the magnitude of each of a plurality of the sample data obtained by sampling is above a prescribed level or not and a detector which detects the asymmetry of the regenerative signal by using the prescribed sample data in accordance with the output from the decider. The jitter detecting device has a clock former which forms the clock signal in accordance with the regenerative signals, an analog-to-digital converter which samples the regenerative signals in synchronization with the clock signal, and the decider which decides whether the magnitude of each of a plurality of the sample data obtained by sampling is above the prescribed level or not and the detector which detects the jitter of the regenerative signal by using the prescribed sample data in a plurality of the sample data in accordance with the output from the decider.

8. 发明专利

JPH05242659A 失效
公开(公告)号：JPH05242659A
公开(公告)日：1993-09-21
申请号：JP4255492
申请日：1992-02-28
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAKAHASHI TOSHIHIKO
IPC分类号： G11B7/00 , G11B7/004 , G11B7/005 , G11B20/00 , G11B20/10 , G11B20/18 , G11B27/36
摘要： PURPOSE:To improve the reliability of recorded data regarding the verifying operation of an optical disk device, etc. CONSTITUTION:An envelope 201 is detected by an envelope detection circuit 2 and after information about the vibration and fluctuation of a reproducing signal is detected at an envelope emphasis circuit 21, it is amplified. A reproducing signal 101 is modulated using a modulation circuit 22 by the output signal 211. Thus, when a reproduction for the verifying operation is executed immediately after information is recorded, a certain amount of data error is expanded on purpose, the quality of data is reduced on the surface, it is made easy to generate an error at a host device, the reproduction is executed in an extremely difficult condition and a recording is completed only when it is made readable and therefore, the quality of information recorded in a storage carrier is assured at a high level.

9. 发明专利

JP2006252645A Jitter detector 有权
标题翻译：智能探测器
公开(公告)号：JP2006252645A
公开(公告)日：2006-09-21
申请号：JP2005066457
申请日：2005-03-10
申请人： Matsushita Electric Ind Co Ltd , 松下電器産業株式会社
发明人： OGURA YOICHI , TAKAHASHI TOSHIHIKO , KONISHI SHINICHI
IPC分类号： G11B7/005 , G11B20/10
CPC分类号： G11B20/10212 , G11B20/10037 , G11B20/10046 , G11B20/10194 , G11B20/10425 , G11B20/10481 , G11B20/14 , G11B20/22 , G11B2220/2537
摘要： PROBLEM TO BE SOLVED: To provide a jitter detector capable of extracting high precision jitter at high speed. SOLUTION: After performing waveform shaping of a reproduced RF signal 3 detected from an optical disk medium 1, it is converted into a digital RF signal 6 by a sampling clock 8 with a cycle which is twice that of a channel clock. After that, a portion of offset fluctuation of high frequency is compensated by an offset compensation circuit 9, data missed in the time direction is restored by a Nyquist interpolation filter 23. The high precision jitter is extracted by using a digital signal arithmetic circuit 29 after selecting a position for extracting the jitter according to reproduction speed of the optical disk medium 1 and an computing power of the digital signal arithmetic circuit 29 from its output signal by a jitter detection preprocessing circuit 28. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：提供能够高速提取高精度抖动的抖动检测器。解决方案：在从光盘介质1检测到的再现RF信号3进行波形整形之后，通过采样时钟8将其转换成数字RF信号6，周期是通道时钟的两倍。之后，通过偏移补偿电路9补偿高频偏移波动的一部分，通过奈奎斯特内插滤波器23恢复在时间方向上遗漏的数据。通过使用数字信号运算电路29，经过数字信号运算电路29，提取高精度抖动根据抖动检测预处理电路28，根据其输出信号选择根据光盘介质1的再现速度提取抖动的位置和数字信号运算电路29的计算能力。（C） JPO＆NCIPI

10. 发明专利

JP2006134542A Optical disk recording and reproducing device 有权
标题翻译：光盘记录和再现设备
公开(公告)号：JP2006134542A
公开(公告)日：2006-05-25
申请号：JP2004325575
申请日：2004-11-09
申请人： Matsushita Electric Ind Co Ltd , 松下電器産業株式会社
发明人： OGURA YOICHI , TAKAHASHI TOSHIHIKO , HAYASHI HIROAKI , IZUMI MITSUHIKO , ICHIYANAGI MASARU , KONISHI SHINICHI
IPC分类号： G11B7/0045 , G11B7/005 , G11B7/125
CPC分类号： G11B7/0053 , G11B7/00375 , G11B7/1263 , G11B7/24082 , G11B20/10009 , G11B20/1403 , G11B27/24 , G11B2220/2575
摘要： PROBLEM TO BE SOLVED: To provide an optical disk recording and reproducing device in which quality of recorded digital data can be satisfactorily guaranteed even at high speed recording/reproducing and circuit scale and power consumption can be reduced. SOLUTION: This device is provided with a first analog/digital converter 35 in which a push-pull signal 14 detected from an optical disk medium 1 is shaped by a light difference signal shaping circuit 21 and converted to a digital sampling signal 38 by a sampling clock 37 synchronized with a channel frequency, a series of means by which wobble amplitude information 77 at the time of recording is detected from the digital sampling signal 38, a series of means by which address polarity information 60 and address positional information at the time of reproduction are detected, and a recording laser power control circuit 113 controlling recording laser power to power suitable for recording on the basis of the wobble amplitude information 77. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：解决的问题：为了提供即使在高速记录/再现也可以令人满意地保证所记录的数字数据的质量的光盘记录和再现装置，并且能够降低功率消耗。解决方案：该装置设置有第一模拟/数字转换器35，其中从光盘介质1检测到的推挽信号14由光差信号整形电路21整形并转换成数字采样信号38 通过与信道频率同步的采样时钟37，从数字采样信号38检测到记录时的摆动幅度信息77的一系列装置，通过这些装置将地址极性信息60和地址位置信息检测再现时间，以及记录激光功率控制电路113，其基于摆动振幅信息77控制记录激光功率以适合于记录的功率。（C）2006年，JPO和NCIPI

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