Matsushita Electric Industrial Co., Ltd.

Koninklijke Philips Corporation N.v.

Panasonic Corporation

Sony Corporation

Koninklijke Philips Electronics N.v.

Koninklijke Philips Electronic N.v.

Miyuki Sasaki

Yoshihisa Fukushima

Yoshiho Gotoh

Yoshiho Goto

Kaoru Murase

Hiroshi Ueda

Motoki Kato

Wilhelmus Jacobus Van Gestel

Tatsushi Bannai

Masanobu Nakamura

Steven Broeils Luitjens

Motoki Sony Corporation Kato

Masanobu Sony Corporation Nakamura

Congested rewriting in the same area is to be evaded to suppress the tendency towards occurrence of defective areas. When a streamhas been recorded, the last written address, representing the last written position, is stored. When recording a streamnext, recording is started directly following the position indicated by the last written address for the stream. The last written address, corresponding to the last address of the recording position, is stored. If the streamis erased for recording a stream, recording is started not at a position directly following the last written address of the stream, but from a position directly following the last written address of the stream. When the streamhas reached the end of a recording area, the next following data is recorded as from a position directly following the stream

Information recording method and apparatus, information reproducing method and apparatus, information recording medium, program storage medium and program

In order to perform simultaneous recording of a plurality of pieces of real time data, a large capacity of buffer memories were required. In addition, it was difficult to reproduce data which was recorded by a different apparatus. The present invention has an objective of providing an information recording medium, a simultaneous recording method, and an information recording and reproduction apparatus which guarantee simultaneous recording. The simultaneous recording is guaranteed by reproducing data in each of areas having at least a minimum size fulfilling the simultaneous recording condition which allows for the number of access operations which is twice the number of pieces of real time data to be recorded, and when the data amount in the buffer is empty, switching the current recording operation to another recording operation to continue recording.

Method and apparatus for simultaneous recording and reproducing information recording medium therefor

An information recording medium comprises a data recording area. A lead-in area and a volume space are allocated in the data recording area in advance. The volume space is constructed so as to allow a logical zone for recording at least a volume-file structure and an over-run protection area for preventing an access to an unrecorded area to be alternately allocated in the volume space. The lead-in area and the over-run protection area each include a chain volume management information area for storing chain volume management information. The chain volume management information includes address information of a subsequent logical zone and address information of a subsequent chain volume management information area.

Information recording medium, information recording method, information recording apparatus, information reproducing method and information reproducing apparatus

When recording data on a medium where a certain data rate is required, an allocation manager in the player must allocate sections of the logical space in such a way that the recording medium is efficiently filled and that an adequate data rate can be guaranteed even in the presence of defective ECC blocks. The allocation rules for the allocation manager are complex. The rules can be simplified by placing a lower limit on the size of an extent and by increasing the size of the extent depending on the number of defect ECC blocks in the extent.

Allocation of real time files

Information recording method and apparatus, information reproducing method and apparatus, information recording medium, and program storage medium with overwrite protection features limiting the possible number of rewrites

In order to perform simultaneous recording and reproduction, a large capacity of buffer memories were required. In addition, it was difficult to record data while reproducing data which was recorded by a different apparatus. The present invention has an objective of providing an information recording medium, a simultaneous recording and reproduction method, and an information recording and reproduction apparatus which guarantee simultaneous recording and reproduction. The simultaneous recording and reproduction is guaranteed by reproducing data recorded in an area having at least a minimum size fulfilling the simultaneous recording and reproduction condition which allows for four access operations, recording data in an area having at least the same size, and performing reproduction and recording alternately by switching reproduction to recording when the data amount in the reproduction buffer becomes full and switching recording to reproduction when the data amount in the recording buffer becomes empty.

Information recording medium, method for simultaneous recording and reproduction, and information recording and reproduction apparatus

Method for emptying recording buffer can be made empty by at most one access operation and at most two recording operation, in a simultaneous recording and reproduction

According to a recording method for a conventional rewritable disc, the latest data is recorded by rewriting data in an identical area. In the case of a disc of which the number of times of data rewrite is limited, this causes a problem that a defect block is easily generated. The present invention has an objective of providing an information recording medium, an information recording and reproduction method, and an information recording and reproduction system apparatus, by which data is recorded sequentially from an unallocated area after an entry sector number, and data recording is sequentially repeated from an inner portion to an outer portion.

Information recording medium, information recording method, information recording apparatus, information reproduction method, and information reproduction apparatus

Information recording medium, information recording method, information recording apparatus, information reproducing method, and information reproducing apparatus

In the case of a conventional data structure of a disk on which data is recorded by a CD-R multisession method, a dedicated command is needed to read the latest file structure recorded during the last session by reading chainedly the first address of the subsequent session recorded in the read-in area of a session, and it is necessary to close the session so as to read data by means of a reproduction-only device. According to the invention, a set of information on management of unrecorded areas and a set of information on management of file structure/file information are recorded as chain-type information (, . . . ) and are read chainedly in a volume space so as to acquire the latest management information. Open maintenance information () is recorded at the start of recording and close maintenance information () is recorded at the end of the recording. The information is read chainedly, and thus information on volume is acquired.

Information recording medium, information recording/reproducing method, and information recording/reproducing device

An information recording medium for recording a real-time file containing real-time data in such a manner that the real-time data is continuously reproducible by a playback reference model, the real-time data including at least one of video data and audio data. The playback reference model includes: a pickup for reading the real-time data from the information recording medium; a buffer memory for temporarily storing the real-time data read by the pickup; and a decoder module for reading the real-time data from the buffer memory for processing. The information recording medium includes a volume space for at least recording in sectors a file containing data and file management information for managing the file. The real-time data is recorded in at least two real-time extents each of which is allocated in logically contiguous sectors within the volume space. An (i+1)real-time extent among the at least two real-time extents is positioned at a position satisfying a real-time reproduction condition.

Growing community of inventors

Osaka, Japan

Miyuki Sasaki