Abstract:
PURPOSE:To reduce reproducing data error by reducing cross talk between adjacent tracks and to increase recording density by reducing a guard band which between the tracks. CONSTITUTION:Unique patterns 23 and magnetic clock patterns 22 continuing radially are provided on a magnetic disk 21, and data segments 24 are provided between them. A head 26 is connected to a reproducing amplifier 28 corresponding to the patterns 23, 22 and head 26 is connected to a recording amplifier 33 corresponding to the segment 24 in a recording mode. An external clock CKO synchronizing with the pattern 22 is formed in a clock generation circuit 31, and a data existing point clock CKd is formed by that and inputted to a D flip-flop 32 supplying recording data to the amplifier 33. A recording is performed while magnetization inversion phases are shifted by 180 deg. from each other between the adjacent tracks since the clock CKd has phase difference of 180 deg. between even-numbered and odd-numbered tracks. The cross talk is reduced since reproducing pulse positions of a reproducing subject track and an adjacent track are not superposed mutally.
Abstract:
PURPOSE:To eliminate the need for a FIFO memory for correcting a time base and to simplify the constitution by using a code data storage memory as a time correction memory, as well, at the time of decoding for which the algorithm of wood is used. CONSTITUTION:A partial response class IV code is used as a modulation code and a Viterbi decoding method, sometimes, the decoding system of Wood is adopted as a decoding system. In such a state, a digital reproducing code is supplied directly to a decoding circuit 40 and a decoding processing is executed and also by a write clock WCK from a PLL circuit 20, decoding data are written in the memory of the decoding circuit 40 and by a read clock RCK in which time bases obtained from a clock generating circuit 21 are complete, the data are read. Thus, as for the decoding data, influence by an inter-code interference is eliminated and also its data become the data from which a jitter is eliminated. In such a manner, a time correction FIFO memory becomes unnecessary and the circuit configuration is simplified.
Abstract:
PROBLEM TO BE SOLVED: To provide an information processor capable of obtaining appropriate shading correction coefficient, an information processing method and an information processing program.SOLUTION: The digital microscope system includes: an illumination optical system that emits a beam of illumination light; a stage having an opening through which the illumination light transmits, the stage loading a preparation aligning to the position of the opening; an objective lens for magnifying an image disposed facing to the illumination optical system being interposed by the stage; a magnification imaging unit having an imaging element for taking images magnified by the objective lens; a white image acquisition section that acquires an image formed on the imaging element of the magnification imaging unit as a white image while emitting the illumination light from the illumination optical system in a state that the opening of the stage is opened and an imaging point of the illumination optical system is adjusted to a focal point of the objective lens of the magnification imaging unit; and a calculation section that calculates a shading correction coefficient by using the taken white image.
Abstract:
PROBLEM TO BE SOLVED: To obtain the image of a fluorescent-stained biological sample, without degrading image quality. SOLUTION: Exciting light for making a fluorescent material marked on a target in a biological sample SPL lie in a non-excited state and for making a fluorescent material marked on a control with the probe lie in an excited state is emitted from an exciting light source 51, to take the image of the entire slide glass SG including the biological sample SPL as a dark field thumbnail image by a thumbnail camera 14, so that the dark field thumbnail image including the entire fluorescent-stained biological sample SPL can be obtained without degrading the image quality. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To increase detection accuracy of information recorded by groove wobbling. SOLUTION: For reproduction of read-only information such as address information recorded by groove wobbling, viterbi decoding is used for decoding an information word represented by a plurality of phase changes of wobbling. In this case, as an encoding rule for representing a 1-bit information word, by decoding the information word by viterbi decoding based on a state transition decided by an encoding rule where a minimum intercode distance exceeds 1, the detection accuracy of address information or the like is increased, and a recording operation or the like is more stably performed under conditions where external disturbances occur. Especially, based on the encoding rule of the 1-bit information word, transition is degenerated in the state of the viterbi decoding process, and efficient decoding processing which causes no increase in circuit scale is carried out. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To perform appropriate error correction without increasing data capacity in the case of combining a trellis code and an expansion partial response class 4 to use. SOLUTION: A magnetic disk drive 1 makes the configuration of a data string to be four interleaves in the case of performing encoding/decoding obtained by combining the trellis code obtained by confining an encoding ratio as 16/18 with the expansion partial response class 4.
Abstract:
PROBLEM TO BE SOLVED: To improve the reliability of data by strengthening the correcting ability for the error of data in the manner of effectively utilizing the alternate recording region prepared as the alternating region in the case a defective sector is generated in the data recording region. SOLUTION: Codes C2 are added for every data amount corresponding to a recording track T of a magnetic disk with respect to the data constituting the AV data stream, or the like. Then, the data are written into the data recording region A1 of the magnetic disk, and also a code C2 is written into the vacant region not being used as the alternating sector among the alternate recording region A2 of the magnetic disk.
Abstract:
PROBLEM TO BE SOLVED: To efficiently suppress the occurrence of data errors while ensuring real time performance in the case of recording or reproducing data such as compressed image data where the real time performance is essential. SOLUTION: In this data recorder, a temporary storage register 34 temporarily stores information denoting the importance of a cluster being the recorded unit of data in the case of recording the data being the components of an AV data stream on a magnetic disk 5. On the occurrence of a write error, the importance of a cluster having the write error is recognized by referencing the temporary storage register 34 and the degree of retrial of writing the cluster having the write error on the magnetic disk again is selected depending on the importance of the cluster.
Abstract:
PURPOSE:To reliably reproduce the ID of a sector without being influenced by the position of a disk in its radial direction when the recording head and the reproducing head are separately installed. CONSTITUTION:Each sector is divided into a servo data recording area 1 and a data recording area 2, and a clock mark 11 and wobble marks 12, 13 are formed in the area 1. At the head of the data recording area 1 of each sector, an ID recording area 2h is formed, and it is divided into two ID recording areas--2a for the time of reproducing mode and 2b for the time of recording mode. These areas are arranged on the inner and outer peripheral sides respectively in a displaced manner. By this arrangement, ID information can be reliably read even when the scanning positions are displaced from each other because the recording head W and the reproducing head R are separated at a specified interval in the radial direction. The area 2a functions as a gap at the time of continuously recording the sector and the drop of efficiency on the format is prevented by arranging the area 2a on the upstream side from the area 2b.
Abstract:
PURPOSE:To reduce time delay required for decoding data and detecting errors by providing an exclusive OR operation means for latch means themselves at a latch means serially connected which constitutes a shift register performing a viterbi-decoding method. CONSTITUTION:A processing circuit 10 processing samples of even column and a processing circuit 20 processing even column are constituted. A shift register operation circuit 2 viterbi-decodes reproduced data based on algorithm using differential metric, while performs CRC operation. In the circuit 2, four signals are generated by a selecting signal from a switching circuit 1, MERGE- EVEN and DATA-EVEN from a comparator 23, and MERGE-ODD and DATA- ODD from a comparator 23, successively latched by FF with timing of a clock, and a result of CRC operation can be obtained. Viterbi-decoding and CRC operation is performed at the same time, and delay time required for decoding data and detecting errors is greatly reduced.