摘要:
In a read only type optical disk and a write type optical disk (1) each thereof having a data recording area (18) and a spare area (17), first encoded data for error detection and correction are recorded in the data recording area (18, 25). In the case of the read only type optical disk (1), the spare area (17) is used as a check sector (22, 31) in which second encoded data are recorded. When error correction by first error control means (7) becomes impossible while sectors in the data recording area (18, 25) are reproduced, second error control means (10) performs error correction by using the check sector (22, 31) corresponding to an associated error sector. In the case of the write type optical disk (1), the spare area (17) is used as an alternate sector. A defective sector detected by defective sector detecting means (10) is alternately recorded by being replaced by the alternate sector through sector alternating means (9).
摘要:
An optical disc for recording, reproducing or erasing data is radiated with an erasing light beam (10) and a recording-reproducing light beam (9) sequentially to record or reproduce the data with the recording-reproducing light beam and erase the data with the erasing light beam. In rewriting the data, the erasing light beam is radiated in advance of the recording-reproducing light beam on a data section of the disc, and the old data is erased by temperature increase and annealing by the erasing light beam, while new data is recorded by temperature increase and quenching with the recording-reproducing light beam set to the recording light intensity. After recording the new data, the light intensity of the erasing light beam is gradually decreased and turned off. In rewriting the sector data, the erasing light beam is radiated on the data section in advance of the recording-reproducing light beam, and by the temperature increase and annealing with the erasing light beam, the old data is erased, while new data is recorded by temperature increase and quenching with the recording-reproducing light beam set to the recording light intensity. After recording the new data, the light intensity of the erasing light beam is turned off after being modulated for a predetermined time. By doing so, the process of the temperature and quenching is eliminated which otherwise might be required at the time of turning off the erasing light beam, thereby preventing occurrence of a recording trace and a defect of the recording medium by a thermal shock.
摘要:
Playing a data signal from an illegally produced data storage medium can be effectively disabled regardless of the type of storage medium so that copying can be prevented effectively at low cost. An encrypted data signal encrypting a copy-controlled data signal has superimposed thereto as a digital watermark identification data identifying the data signal as an encrypted signal. A data storage medium records this encrypted data signal, a data signal player reproduces the signal, and a data signal recorder records the signal.
摘要:
A method of selectively accessing a desired recording layer on a multi-layered optical disk is described. The multi-layered optical disk comprises a first recording layer (3; 7a) superposed on a first base plate (2), a second recording layer (4; 7c) superposed on a second base plate (2), and a spacer (5) of adhesive disposed between the first recording layer (3; 7a) and the second recording layer (4; 7c). Each recording layer (3, 4; 7a, 7b, 7c) has an identification section (ID a , ID b ). Information is recorded on and/or reproduced from the recording layers (3, 4; 7a, 7b, 7c) by a focused light beam. The method comprises changing the focus of the light beam and detecting zero cross points of respective focusing error signal S curves, each S curve corresponding to a respective recording layer, until the same number of zero cross points as an ordinal number of the desired recording layer is detected. The correct selection of the recording layer (3, 4; 7a, 7b, 7c) is confirmed by reading an identification section (ID a , ID b ) thereof which stores its recording layer address.
摘要:
A method of selectively accessing a desired recording layer on a multi-layered optical disk is described. The multi-layered optical disk comprises a first recording layer (3; 7a) superposed on a first base plate (2), a second recording layer (4; 7c) superposed on a second base plate (2), and a spacer (5) of adhesive disposed between the first recording layer (3; 7a) and the second recording layer (4; 7c). Each recording layer (3, 4; 7a, 7b, 7c) has an identification section (ID a , ID b ). Information is recorded on and/or reproduced from the recording layers (3, 4; 7a, 7b, 7c) by a focused light beam. The method comprises changing the focus of the light beam and detecting zero cross points of respective focusing error signal S curves, each S curve corresponding to a respective recording layer, until the same number of zero cross points as an ordinal number of the desired recording layer is detected. The correct selection of the recording layer (3, 4; 7a, 7b, 7c) is confirmed by reading an identification section (ID a , ID b ) thereof which stores its recording layer address.
摘要:
An information recording medium of the present invention includes: a volume space in which user data is recorded; a spare area including a replacement area which may be used in place of a defective area included in the volume space; and a defect management information area in which defect management information for managing the defective area is recorded. The defect management information includes status information indicating whether the defective area is replaced by the replacement area.
摘要:
A multimedia optical disk is provided. The multimedia optical disk includes a data area for storing objects which include moving picture data and at least one of audio data and sub-picture data. The multimedia optical disk also includes an index area for storing reproduction orders of the objects. Route information in the index area includes a sequence of addresses of objects whose alignment represents a reproduction order. Chain control information in the index area corresponds to the route information. The chain control information, being effective in reproducing objects specified by the alignment of the sequence of addresses (objects specified by the alignment of the sequence of addresses are called a chain), instructs the reproduction apparatus to have a navigation control of the chain. A piece of moving picture data having a certain time period is reproduced at the same timing as a piece of audio data and a piece of sub-picture data. A piece of sub-control information, being effective in reproducing moving picture data, sub-picture data, and audio data stored in a small unit instructs the reproduction apparatus to have a navigation control of the data stored in the same small unit.
摘要:
The present invention relates to a method for recording an AV file using an information recording disk in which data is recorded/reproduced by sectors. The recording method includes the steps of: determining whether or not input data is AV data; detecting a defective sector existing in an assigned data recording area; when the input data is AV data while a defective sector is detected in the data recording area, allocating a defective extent including the defective sector; recording AV data in continuous sectors while skipping the defective extent; and allocating an area of continuous sectors where only the AV data is recorded as one AV extent.