Abstract:
PURPOSE:To surely obtain the information of a sector even if a defect is generated in a segment of a header by recording the information of its sector and the information of the succeeding sector in a control information recording area of each sector. CONSTITUTION:In a control information recording area of each sector, information of its sector and information of the sector which succeeds its sector are recorded. Therefore, in a ROM mark 15 provided together with an area 14, a reference clock area 16, and a sector number 17 in a header H2, information as to whether, for instance, three sectors which succeed this sector are ROM sectors or not is recorded together with information as to whether this sector is the ROM sector or not. In such a way, even if a defect is generated in a header of one sector, information of this sector is obtained surely.
Abstract:
PROBLEM TO BE SOLVED: To enable a user to receive the distribution of content such as a music or video without any stress even when any high speed network environment is not prepared, and to reduce the labor of the user in the distribution or use of contents. SOLUTION: A content download system is configured of content providing media (3, 4) having a hologram memory 1 in which content data are recorded as download data and a download device 50 for reading and acquiring content data from the hologram memory installed in the content providing medium. Mass content is attached to a poster or book or the like by a hologram memory, and the content data are downloaded from the hologram memory. Thus, it is possible to save any labor on a high speed communication line or system. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To enhance the design of a recording medium itself in a hologram recording medium for recording computer data. SOLUTION: The optical recording medium as a hologram memory contains is used to record data in a first form such as computer data and data in a second form such as image data that can be recognized by a person on the optical recording medium. That is, the recording medium is used as a recording medium with a large capacity for computer data, as well as recording image data visually recognized by a person are recorded so as to make the image visible in the appearance of the medium. Since the recorded data in the first form are computer data which are premised as being read out by a reproducing apparatus, the reproducing apparatus reads out reproduced images of the recorded data in the first and second forms from the optical recording medium, and then extracts only the recorded data in the first form. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To detect unintended track jump in an extremely short time. SOLUTION: A track jump detecting apparatus is provided with a biphase decoder 29 for sequentially reading out ADIP from a track in which music data of a magneto-optical disk 100 and generating bit data BDI including addresses, a BCH decoder 30 and a CRC decoder 31 decoding a read-out address value ADI based on the bit data BD1, an address interpolation circuit 34 and an address adding circuit 35 generating an interpolation address value AD2 succeeding to an address by performing interpolation processing for the read-out address value AD1, a parity generating circuit 36 generating interpolation bit data BD2 having an equal data form as the bit data BD1 based on the interpolation address value AD2, and a comparator 38 detecting unintended track jump by comparing delay bit data BD3 in which the bit data BD1 is delayed slightly with the interpolation bit data BD2 by each bit unit. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk unit in which a control in track jump is stabilized, an inter-track movement to an adjacent track is made possible even for an optical disk of a land/groove recording system. SOLUTION: A tracking serve control part of the optical disk unit is provided with an offset signal generator 301 which is an offset means which gives an offset to a tracking error signal and an accumulator 302, a polarity reversing device 303 which is a polarity reversing means which reverses the polarity of the tracking servo of a servo loop, and a system controller 25 which is a controlling means which controls the offset means and the polarity reversing means. The inter-track movement of an optical head to an adjacent track is performed by giving the offset to the tracking error signal by the offset means and reversing the polarity of the tracking servo by the polarity reversing device 303 while the servo loop is closed.
Abstract:
PROBLEM TO BE SOLVED: To read a same address even from a land side by recording addresses used in common by the land side and a groove side of the optical disk by means of a wobbling method from both side walls of either of them, e.g. the groove side. SOLUTION: Relating to the optical disk where a land or a groove in a concentrical or spiral form are formed alternately, in the case of recording address information by wobbling both side walls of grooves, a modulation pattern is decided depending on a wobble modulation pattern for a succeeding groove (a groove (a) of A in figure) opposed to a groove (e.g. a groove (b) of A in figure) with a land (a land between (b) and (a) of A in figure) inbetween so that the same address information is obtained from the land (the land between (b) and (a) of A in figure) in contact with the groove (e.g. a groove (b) of A in figure).
Abstract:
PROBLEM TO BE SOLVED: To reduce an effect due to an offset to the other side beam by one side beam between two beams. SOLUTION: Grooves 1 (WAO, WBO, WA1, WA2) modulated with only one side are formed sequentially by turning on or off one side laser beam between two laser beams according to a modulating signal, and relating to an optical disk recorded with the required data by the grooves 1, the grooves 1 are formed by wobbling one side laser beam so as not to affect the other side laser beam. Thus, the matter that the light intensity of one side beam is added to the other not wobbling side beam only by the wobbling much is eliminated, and the offset has no effect on the other side groove.
Abstract:
PROBLEM TO BE SOLVED: To execute the demodulation processing of a frequency modulation signal a with simple constitution and to exactly demodulate digital data even if there is a deformation by a defect, etc., of a recording medium in the frequency modulation signal. SOLUTION: The address information ADM after bi-phase modulation is subjected to frequency modulation and is recorded as a groove wobble. A wobble signal SWB which is a reproducing signal of this groove wobble is modulated to a binary signal PWB. The wobble signal SWB has 4 waves at the time of a '1' and 3 waves at the time of a '0' in correspondence to the 1 bit (bi-phase 1 bit) of address information ADM. Demodulation processing is executed in a detecting circuit 67 by using a clock signal CK24 synchronized with the pulse signal PWB having a frequency of 24 times the bit frequency of the bi-phase. In this processing, the '1' and '0' are decided by utilizing the coincident number of the edge detection signal of the binary signal PWB and the window pulses relating to the patterns of the binary signals respectively corresponding to '1' and '0' of the digital data.
Abstract:
PROBLEM TO BE SOLVED: To dispense with an additional circuit for reproducing control information by detecting address information and control information independently from the wobble signal of an optical disk to enable the control information to be reproduced with the same reproducing means as that of the wobble signal. SOLUTION: Channel data is supplied from a wobble signal decoding circuit to an 8-bit shift register 56. A CTM comparator circuit 58 outputs a CTM detection signal to a system controller when the channel data coincide with CTM(control track mark) data. A synchronization detecting circuit synchronizes ADIP (address information) data and parameter information with respect to the wobble signal subjected to a biphase modulation by detecting SYNC data being independent codes and the CTM data. Then, the ADIP data and data of a control track area can be detected by being separated.
Abstract:
PROBLEM TO BE SOLVED: To cope with various kinds of recording and reproducing systems and also to enhance a recording capacity and to simplify a clock system by forming address sink. in segment data areas of respective address segments. SOLUTION: In each zone, (n) pieces of segments are formed in one round track and (m) pieces of them are made to be address segment and (n-m) pieces of them are made to be data segments. Moreover, header sink. of first clock extracting patterns to be used for extracting a clock are formed in respective segments and address synchs. of second clock extracting patterns for extracting a clock to be used for reproducing recorded track addresses are formed in respective address segments. Thus, since a clock can be formed every read-in address even when a device is in a seek, it is made unnecessary to set a common clock in an internal and outer peripheral direction and since same density recordings in internal and outer peripheral zones can be performed over whole areas, the recording capacity is enhanced.