Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-06-29
2002-12-03
Tran, Thai (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C360S013000, C369S083000
Reexamination Certificate
active
06490404
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an information recording medium and an editing apparatus therefor, particularly, relates to a rewritable information recording medium which is divided into a plurality of sectors having predetermined volume of data, and relates to an editing apparatus and method of editing audiovisual information recorded in the information recording medium.
2. Description of the Related Art
It is commonly performed that data of digital audiovisual information are compressed and the compressed data are recorded in an information recording medium with recent progress and development of information processing technology. With respect to video information, particularly, a total volume of information content is huge. Therefore a high degree compression technology is utilized for an information recording medium so as to utilize limited volume of information content of the information recording medium effectively. The high degree compression technology is represented by not only data compression by correlation within one frame, which is a unit of video, but also a method of compressing data by correlation among a plurality of frames, which are adjacent to each other temporally. It is widely utilized for recording and transmitting video information.
In case of editing a result of data compression of video information, it is impossible to delete a frame by frame if a frame correlation is utilized. It is caused by that a frame to be referred can not be decoded if a referring frame to be correlated is deleted. Therefore, it is commonly prepared for a subsequent editing process that a plurality of frames are grouped in blocks and the blocks are encoded so as to be able to process them independently without processing frame correlation among the blocks. These block data, which are encoded block by block basis, are well known that each data volume varies by complexity of video signal in a block or a degree of correlation among frames.
Block data mentioned above are recorded on an information recording medium. However, it is necessary to be considered that a search operation can easily be performed in a reproduction process with arranging the block data in a sector from a head of the sector so as to occupy an integer number of sectors. It is realized by a well-known method that block data are encoded with including embedded data at an end of the block data. Accordingly, block data are recorded in an information region “A” as shown in FIG.
1
.
It is commonly performed that a video information is grouped in blocks by an individual number of frames so as to compress the video information efficiently. In other words, it shall be considered that a displaying period of each block shown in
FIG. 1
is different from each other by a frame period as a unit. In addition thereto, a volume of block data is different from each other as shown in
FIG. 1
since compression ratio per block is different from each other.
In case that the above mentioned method is compared with other method such as linear pulse code modulation (PCM) which is not compressed and has a proportional relation between a elapsed time and a total volume of coded data, it is conceivable that a search reproduction starting reproduction from a block data array at a designated timing is very difficult by the above mentioned method.
To solve the above-mentioned problem, the Japanese Patent Laid-open Publication No. 9-23404/1997, which is titled as “Medium Recording Method, Apparatus Therefore and Medium Reproduction Apparatus”, discloses that a search reproduction is performed by using a collation table which is previously recorded as a collation table of time recording location. According to the medium recording method disclosed in the above mentioned Japanese Patent Laid-open Publication, video information as prescribed main information is encoded by the MPEG (Moving Picture Experts Group) system, which is an international standard of moving picture, and a plurality of GOPs (Group of Pictures), which is a unit of compression, are produced, then the produced plural GOPs are recorded on a recording medium. In case that the video information is divided by a predetermined time unit, a start address of data at each time unit is produced and recorded on a recording medium in conjunction with plural GOPs.
According to the medium recording method, a collation table of time recording location is composed of arrays of reproduction start address at each predetermined time unit. Encoded data are grouped in blocks by a compression unit, GOP. The recording method records information indicating a head portion of a GOP as a reproduction start address. The
FIG. 1
shows an arrangement of data array as one concept.
The current method mentioned above functions properly for a search reproduction under a condition of not updating a block data array such that a block data array is recorded on a read-only medium. However, some problems may happen when the block data array is updated. In case that a block data array is recorded on a rewritable recording medium, contents of the block data array can be edited. For example, it is conceivable that a reproduction is skipped by a block data unit during a period of “s” as shown in FIG.
2
. Generally, it is not necessary to erase a block data to be skipped since information, which designates reproduction sections and reproduction sequence of the reproduction sections, is recorded on a recording medium as reproduction control data.
In case of skipping the block data “D” shown in
FIG. 2
, the reproduction period “s” for two block data “D” becomes zero in the reproduction mode, that is, two block data “D” equivalent to the reproduction period “s” are not reproduced and the reproduction is forwarded to the subsequent blocks after the block data “D”. In addition thereto, the reproduction start address
3
shall be deleted from the collation table of time recording location since the reproduction start address
3
designates the section to be skipped. Further, all reproduction start addresses after the reproduction start address
4
and subsequent reproduction start addresses must be updated so as to designate correct location since the period “s” is independent of a period “u”. Accordingly, it is necessary to recalculate address information based upon a correlation between a capacity of blocks subsequently to the block “D” and a reproduction period, and an editing process is disposed to be very complicated.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an information recording medium recorded with a collation table of time recording location, which is suitable for editing of assigning a sectional skip, in conjunction with encoded data. Another object of the present invention is to provide an editing apparatus, which can assure simple and high speed editing.
In order to achieve the above object, the present invention provides, according to an aspect thereof, an information recording medium which comprises a first recording region recorded with a plurality of block data continuing in time sequence, wherein the plurality of block data are compressed by an encoding system of varying an amount of codes per each block after temporally continuing information signals are divided into a plurality of blocks, and comprises a second recording region recorded with at least more than one collation table of time recording location, wherein the collation table of time recording location is composed of more than one collation data by every fixed time interval for reproducing an arbitrary block data out of the plurality of block data recorded in the first recording region and time compensating data.
According to the aspect of the present invention, there provided an information recording medium which is further characterized by that the collation data includes a block data location information of designating a block data out of the plurality of block data recorded in the first recording region, which is reproduced at a timing
Kuroiwa Toshio
Sugahara Takayuki
Suzuki Junzo
Anderson Kill & Olick
Lieberstein Eugene
Meller Michael N.
Tran Thai
Victor Company of Japan , Limited
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