JP2003264800A - Information reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform a reproducing operation regardless of a data form recorded on a recording medium in an information reproducing device. <P>SOLUTION: The information reproducing device is provided with a discrimination processing part and a recording medium kind and the data form recorded on the recording medium are discriminated. In the case that management information recorded on the recording medium is different from a desired data form, the data form is converted and then developed on an internal memory. Since the developed management information becomes the same form at all times, the reproducing operation is efficiently performed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing technique for reading out management information of image / sound data together with image / sound data from a recording medium and performing a reproducing operation using these, particularly handling of the management information. Regarding

[0002]

2. Description of the Related Art With the increase in capacity of recording media such as optical disks and magneto-optical disks, and the progress of information compression technology,
Development of a method and apparatus for digitally compressing information amount of data such as image and sound (AV) and recording / reproducing the data is active.
Especially for DVD, which is a large-capacity optical disc, a write-once DV
A recording medium capable of recording data in real time, such as a D-R or a rewritable DVD-RAM, has become widespread, and a recording / reproducing apparatus using these has been developed.

In the recording / reproducing apparatus as described above, by using a disk-shaped recording medium, it is characterized in that it has a large capacity and that the desired data is generally accessed immediately. Therefore, management information including attributes and position information of the AV data is also recorded on the recording medium together with the AV data, and normal reproduction operation and random access are realized by using the management information.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In order to make the recorded data viewable on the existing DVD player, the recording / reproducing apparatus using the D finally uses the recorded data for general cell video or the like.
It should be in the form of a VD video format. DV
In the D video format, not only the logical structure as a file is defined for each recording data, but also the physical arrangement on the disc is defined. On the other hand, in the recording operation of the recording / reproducing apparatus, it is difficult to record the data in the form of the DVD video format in real time, and even when the additional recording operation is repeated, the recorded data, especially the management information is in the DVD video format. Since it is not necessary to form a form, the management information is recorded in a form of an arbitrary data format until a predetermined ending process (hereinafter, referred to as finalization) is performed.

The management information in such an arbitrary data format (hereinafter referred to as intermediate management information for distinguishing from the management information file after finalization) is not limited to the recording operation in the recording / reproducing apparatus, and is not limited to the finalization. Although it is also used in the reproducing operation, when the recording medium having only the recording data in the form of the DVD video format is used, the intermediate management information can be obtained from the recording medium. In that case, no particular consideration was given to how to efficiently perform the reproducing operation.

The present invention has been made in view of the above points, and its purpose is to improve efficiency regardless of whether or not intermediate management information in an arbitrary data format is recorded on a recording medium. An object of the present invention is to provide an information reproducing technique capable of performing a reproducing operation well.

[0007]

In order to achieve the above object, according to the present invention, control means for controlling the overall operation at the time of reproduction, memory means for expanding the management information, and management information from a recording medium are stored. The management information processing means for reading out and expanding in the memory means, and the discrimination means for discriminating the type of the recording medium and the data format on the recording medium are configured. The determination means determines whether the recording medium is finalized or whether data corresponding to intermediate management information is recorded on the recording medium, and the management information processing is performed according to the determination result. The means switches the form of the management information read from the recording medium. Further, when the management information of a form different from the intermediate management information is read from the recording medium, the read management information is converted into the form of the intermediate management information and then expanded in the memory means. Constitute. Since it suffices to always refer to the management information of the same form in the reproduction operation, it is possible to prevent the processing from becoming complicated and improve the efficiency.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of an information reproducing apparatus according to the present invention, and shows an information reproducing apparatus capable of reproducing AV data by using an optical disc as a recording medium. 1 is an optical disk, 2 is a drive processing unit, 3 is a buffer memory, 4 is a separating unit, 5
Is an image data decoding unit, 6 is an audio data decoding unit, 7 is an image data output terminal, 8 is an audio data output terminal, 9 is a management information processing unit, 10 is a management information expansion memory, 11 is a determination unit, and 12 is a control unit. It is a department.

The operation during reproduction will be described. In FIG. 1, the multiplexed encoded data (hereinafter referred to as stream data) is read from the optical disc 1 by the drive processing unit 2 from an arbitrary data position and is temporarily stored in the track buffer 3. Data search information and the like are read out as needed, and the track buffer 3
The stream data is read from the stream data, the image data and the audio data are separated by the separating unit 4, the stream data by the image data is decoded by a predetermined encoding method by the image data decoding unit 5, and the stream data by the audio data is the audio data. In the data decoding unit 6, the data is also decoded by a predetermined coding method and output from the image data output terminal 7 and the audio data output terminal 8 in appropriate signal formats.

The management information processing unit 9 reads out the management information required for the reproducing operation from the optical disk 1 via the drive processing unit 2 and expands it in the management information expanding memory 10, which is a characteristic of this embodiment. The reason is that the discrimination processing unit 11 discriminates the recording medium type and the recording data content of the optical disc 1 via the drive processing unit 2, and notifies the management information processing unit 9 of the content of the management information to be developed. To do. The management information processing unit 9 switches the management information to be read from the optical disc 1 according to the notification content from the discrimination processing unit 11, and expands the management information in the management information expansion memory 10 in a predetermined format. The control unit 12 performs integrated control of the above-mentioned units, and controls the overall reproduction operation according to the management information expanded in the management information expansion memory 10 according to an instruction input by the operator.

A recording medium type used as the optical disc 1 will be described below. Especially here, the DVD
Consider the data in the video format format or the recording medium on which the data is finally recorded in the DVD video format format.

When, for example, a DVD-R is used as the optical disc 1, the recorded data may be in the form of the DVD video format after the finalization as described above. However, in the state before the finalization, an arbitrary data format is obtained. Only the above-mentioned intermediate management information and stream data are recorded on the optical disc 1.

FIG. 2 is a diagram schematically showing an example of a disk image of the optical disk 1 before finalization as a continuous volume space. The left direction shows the inner circumference of the disc, and the right direction shows the outer circumference of the disc. Since the data is being recorded in real time, the volume space is configured to largely secure three areas, that is, area 201, area 202, and area 203. Since the data is filed at the time of finalization, only the necessary data is recorded on the optical disc 1 before the finalization. Data 204 to data 206 represent intermediate management information. Particularly, data 206 is the latest (valid) intermediate management information, and data 204 and data 205 are (invalid) intermediate management information generated before that. Is. Since the DVD-R is a write-once type, the previous intermediate management information is invalidated for each recording, and the latest intermediate management information is recorded. That is, the outermost data unit in the area 202 can be recognized as valid intermediate management information. Also, the data 207 is stream data for generating an AV data file at the time of the finalization described above.

On the other hand, a DVD-R after finalization, or a DVD-ROM used for general cell video, etc.
The data state in FIG. 3 will be described with reference to FIG. Figure 3
Shows a directory structure of recording data formed on the optical disc 1. As described above, each data is in the form of the DVD video format and is treated as a data co-file.

In FIG. 3, the root directory 300
A sub-directory 301 for the DVD video format is arranged under the sub-directory, and all management information files and AV data files as the DVD-video format are placed under the sub-directory 301. The video manager information 302 is written with integrated management information for reproducing the recorded AV data, and includes, for example, reproduction order information and AV data attribute information. The video manager menu video object set (video manager menu VOBS) 303 is an A for displaying an integrated menu for playback in a DVD player.
It is a V data file and is stream data in the same format as an AV data file described later. The video manager information backup 304 has the same contents as the video manager information 302 written therein, and is used for backup when the video manager information 302 cannot be read. In detail, the video title set information 305 describes AV data information managed in units of a plurality of units, and the video title set menu VOBS30.
AV data 6 for displaying a menu for each of the plurality of units in a DVD player is written as stream data in the same format as an AV data file described later. The video title set title VOBS307 is stream data recorded in real time as described above in the case of a DVD-R and stream data as the main title content in the case of a DVD-ROM. It is multiplexed as data. Video title set information backup 3
08 has the same content as the video title set information 305 written therein, and is used for backup when the video title set information 305 cannot be read.

In the case of DVD-R, each file except the video title set title VOBS307 among the above-mentioned files is generated and recorded at the time of finalization based on the above-mentioned intermediate management information (data 206 in FIG. 2). It That is, in FIG. 2, the video manager information 302 and the video manager menu VOBS30 described above are written after the area in which the intermediate management information is written in the area 202.
3, the video manager information backup 304, the video title set information 305, and the video title set menu VOBS 306 are generated and sequentially written. Further, the stream data in the area 203 is made into a file as the above-mentioned video title set title VOBS 307, and the video title set information backup 308 is recorded in the area after that. Area 2
In 01, file system information for physically managing each file structure is written. A Lead_in area is located inside the area 201 and L is located in the outermost area of the area 203.
The ead_out area is arranged and recorded.

Here, the management information expansion processing in the discrimination processing unit 11 and the management information processing unit 9 will be described with reference to FIG. FIG. 4 shows a processing flow in the information reproducing apparatus according to the present invention for reading the management information from the optical disk 1 when the recording medium (optical disk 1) is inserted or when the power is turned on and expanding the management information in the management information expanding memory 10. It is a thing.

First, when the processing is started (S401), the discrimination processing section 11 acquires the recording medium type of the optical disc 1 via the drive processing section 2 (S402). Recording medium type is D
In the case of VD-ROM, the discrimination processing unit 11 notifies the management information processing unit 9 to read the management information in the DVD video form, and the management information processing unit 9 notifies the management information in the DVD video form.
That is, the video manager information 302 and the video title set information 305 in FIG. 3 are read from the optical disc 1 (S408). When the recording medium type is DVD-R,
The discrimination processing unit 11 is an optical disc via the drive processing unit 2.
Acquires whether 1 has been finalized (S40)
3). If it has been finalized, the determination processing unit 11 continues.
Acquires via the drive processing unit 2 whether or not there is data corresponding to the intermediate management information that can be recognized as a file on the optical disc 1 (S404). If there is no data corresponding to the intermediate management information, the management information processing unit 9 reads the management information in the DVD video form from the optical disc 1 by the same processing as in the case of the DVD-ROM (S40).
8). DVD whose recording medium type is not finalized
In the case of -R, and in the case of a DVD-R that has been finalized but the data corresponding to the intermediate management information can be recognized as a file, the determination processing unit 11 causes the management information processing unit 9 to read the management information in the intermediate management information form. The management information processing unit 9 reads the management information in the form of intermediate management information, that is, the data 206 in FIG. 2 from the optical disc 1 (S405). The management information read out as the intermediate management information form is expanded as it is in the management information expansion memory 10 (S406), but the management information read out as the DVD video form has the necessary contents as the intermediate management information. After conversion (S409), it is expanded in the management information expansion memory 10 (S406). With the above, the management information expansion processing is ended (S407).

By the above processing, the management information expanded in the management information expanding memory 10 always has the intermediate management information form, so that the reproducing operation is performed in the same form regardless of the recording medium type. Just refer to it,
Complicated processing can be avoided.

In the above embodiment, the case where some data is always recorded on the recording medium has been described. However, a recording medium on which nothing is recorded may be used as a matter of course, and in that case. The management information in the new intermediate management information format may be expanded in the management information expansion memory 9. Specifically, it is determined that nothing is recorded at the time when the management information is read in S405 or S408, and in that case, new management information is expanded.

[0021]

As described above, according to the present invention, management information is adaptively switched according to the recording medium type and the data state recorded therein to read the management information, and the management information is internally stored in a desired format. By expanding, it becomes possible to perform the reproducing operation efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an information reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing an example of a disk image.

FIG. 3 is a diagram showing an example of a directory structure of recording data.

FIG. 4 is a diagram showing a flow of a management information reading process.

[Explanation of symbols]

1 ... Optical disc 2 ... Drive processing unit 3 ... Buffer memory 4 separation unit 5 ... Image data decoding unit 6 ... Voice data decoding unit 7 ... Image data output terminal 8 ... Audio data output terminal 9 ... Management information processing unit 10 ... Memory for developing management information 11 ... Discrimination processing unit 12 ... Control unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Isobe             292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa             Ceremony Hitachi Digital Media Development Book             Department F-term (reference) 5C053 FA24 GB06 GB21 HA40 KA01                 5D044 AB07 BC05 CC06 DE04 DE43                       DE44 FG18 GK12

Claims (3)

[Claims] 1. An information reproducing apparatus for reproducing image / sound data recorded on a recording medium according to management information recorded on the recording medium, and a control means for controlling the overall operation at the time of reproducing. A memory means for expanding the management information; a management information processing means for reading the management information from the recording medium and expanding the management information in the memory means; and a type of the recording medium and a data format on the recording medium. The management information processing unit is configured to notify the management information processing unit of a determination result according to the type of the recording medium and the data format on the recording medium. An information reproducing apparatus characterized in that the format of the management information read from the recording medium is appropriately switched according to the determination result. 2. The information reproducing apparatus according to claim 1, wherein the management information expanded in the memory means has a first format, and the discriminating means is recorded on the recording medium. If it is determined that the existing management information is in the second format, the management information processing means converts the management information in the second format into the first format and then expands it in the memory means. An information reproducing apparatus characterized by being configured as follows. 3. The information reproducing apparatus according to claim 2, wherein when the determining unit determines that the data is not recorded on the recording medium, the management information processing unit is of the first format. An information reproducing apparatus characterized in that new management information is expanded in the memory means.