Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-02-11
2003-01-07
Boccio, Vincent (Department: 2618)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C386S349000, C369S030040
Reexamination Certificate
active
06504993
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a technique for recording content data, such as video data, on an optical information recording medium, such as a DVD-R (Digital Versatile Disk-Recordable) or a DVD-RAM.
2. Description of Related Art
As a data compression technique for moving picture images, the MPEG (Moving Picture Image Coding Expert Group) system is well known. Moreover, the DVD video is well known as an optical disk that contains video data compressed by the MPEG
2
data compression technique and navigation data showing the reproduction method of the video data. The logical format and the reproduction method of the DVD video are described in detail in Japanese Patent Application Laid-Open No. Hei 8-273304. These items have been selected to formulate the DVD Video Standard.
More specifically, data on DVD video is formed in volume and file structures, and the formats of volume and file structures are prescribed in Micro UDF (Universal Disk Format) and ISO (International Standard Organization) 9660. Information about the format of the volume and file structure (volume data, file structure data) is described in the management area provided in Micro UDF and ISO 9660.
The DVD-R is interoperable with the DVD video and is a write once read many type optical disk into which the user can record information. Detailed description about the DVD-R is given, for example, in “DVD-R: Recordable by the User” in Denshi Gijutsu (Electronics Technology), August, 1996 pp. 10-14.
SUMMARY OF THE INVENTION
According to the literature mentioned above, the DVD-R have the same logical format as that of the DVD video, and therefore information can be reproduced from a DVD-R in the same manner as with a DVD video disk. However, when a user records video data in a DVD-R, as shown in
FIG. 19
, he transfers video data, which is to be recorded on a DVD-R
109
, from his video camera
101
or the like into a VTR
102
. The video data sent to the VTR
102
is compressed by an MPEG encoder
103
, and recorded as material data in memory
104
. Then, a DVD authoring system
105
is used to edit the video data to generate a file of the same format as that of logical data in conformity with the DVD Video Standard, the file is temporarily recorded in a large-capacity intermediate medium
106
, such as a tape device. After all necessary files are complete, a DVD formatter
107
is used to convert those files into the physical format in conformity with the DVD Video Standard, and the files are recorded in a DVD-R
109
by a cutting machine
108
as a recording device.
As has been described, in the conventional DVD-R, it is necessary to generate a file of the logical data format in conformity with the DVD Video Standard, temporarily record in a large-capacity intermediate medium, such as a tape device, then covert those files into the physical format in conformity with the DVD Video Standard, and record the files on a DVD-R. Therefore, the recording data requires at least twice as long as reproducing recorded data.
Description will be given of the reasons why the above-mentioned steps are required.
A data unit to be reproduced includes data pack strings each of which are obtained by compressing according to the MPEG format, content data including at least any of an audio signal, a main video signal and a sub picture signal, and dividing the content data into packets. The data unit further includes a navigation pack, which is placed at the head of the data pack string and contains reproduction information about the data pack string and navigation information describing the relation of the data unit with other data units. The content data is reproduced on the basis of navigation information.
A set of data units mentioned above is called a data cell. Data cells are reproduced successively in time series. Cell reproduction information concerning reproduction of data cells is written in a table outside data cells and is referred to at playback as navigation data.
A video stream includes at least one set of data cells and is called a video object (VOB). One or more video objects that have a common attribute is called a video object set (VOBS). Therefore, in an ordinary movie with one story, one video object corresponds to one video object set, and one video stream concludes with one video object set. Video title set information (VTSI), which describes information for use in reproducing a video object set and attribute information, and a backup of video title set information (VTSI_BUP) are respectively arranged before and after the video object set, and those items of information constitute a video title set (VTS).
A maximum of 99 video title sets can be placed on a DVD-R, and a video manager (VMG) that describes information for managing the video title sets is arranged just before a group of video title sets.
As is understood from the foregoing, video title set information (VTSI) as navigation data for a video object set is undetermined until the end of recording of a video object set. A video manager for managing the respective video title sets is undetermined until recording of all video title sets is finished. Volume and file structure data for managing the contents on the disk as files and directories is undetermined until all data are recorded on the disk are determined.
On the contrary, according to the DVD Video Standard, the video manager, the volume and file structure data are recorded in the leading portion (more specifically, the inner circumference portion) of a recordable user area on the disk. For this reason, when video data is recorded on a DVD-R, as shown in
FIG. 19
, from compressed data to be recorded, files are generated in the logical data format in conformity with the DVD Video Standard, and are temporarily recorded in a large-capacity intermediate medium
106
, such as a tape device. After all files are complete, in other words, after it has become possible to determine a video manager and volume and file structure data, it is necessary for the DVD formatter
107
to perform sectoring and modulation according to the physical format in conformity with the DVD Video Standard, and the cutting machine
108
sequentially records data starting from the inner circumference portion of the DVD-R
109
.
As described above, until all video title sets to be recorded on the DVD-R are determined, a video manager is not determined and cannot be recorded. A DVD-R without a video manager recorded thereon cannot be played on the DVD video reproducing device. Therefore, with a current DVD-R, it is impossible to record TV programs or commemorative pictures and reproduce them immediately afterwards as we do with a video tape recorder (VTR) or a video-movie.
The present invention has been made with the above problem in mind and has as its object to enable the pictures taken with a video camera to be directly recorded on an optical recording medium (optical disk), such as a DVD-R in a format reproducible on a DVD video reproducing device without using an intermediate medium. Another object is to enable a scene to be recorded in such a way that discontinuity does not occur when it is reproduced.
To solve the above problem, according to the present invention, there is provided a DVD recorder for recording content data including any of input main video signal, sub picture signal, and audio signal on an optical information recording medium in a recording format in conformity with the DVD Video Standard, the DVD recorder comprising:
data compression means for compressing the content data at a fixed data compression rate;
data formatting means for adding reproduction information for the content data and navigation data showing the relation with other content data to the content data compressed by the data compression means, and converting the content data into a format in conformity with the DVD Video Standard;
data recording means for recording on an optical information recording medium the content data converted into a format in conformity with the DVD Video Standard by t
Boccio Vincent
Dickstein , Shapiro, Morin & Oshinsky, LLP
Nippon Columbia Co. Ltd.
LandOfFree
DVD recording device and recording method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with DVD recording device and recording method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DVD recording device and recording method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3025319