JP2002335477A - Information recording medium and device for recording/ reproduction information to/from information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a user requires much time and labor in order to generate primary text information and item text information with respect to recorded information on an optical disk such as a DVD-RAM. SOLUTION: When the recording device records broadcast information, the recording device analyzes EPG(electronic program guide) information and a data broadcast program in digital broadcasting to automatically record the primary text information and the item text information. Furthermore, the reproducing device generates a menu bases on the text information generated in this way and reproduces the recorded information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a readable and writable information recording medium, and more particularly to an information recording medium on which multimedia data including various formats such as moving picture data, still picture data and audio data is recorded. Regarding the medium. Further, the present invention relates to an apparatus for recording and reproducing information on and from such an information recording medium.

[0002]

2. Description of the Related Art In the field of rewritable optical disks, the upper limit of which is about 650 MB, a phase change disk DVD-RAM having a capacity of several GB has appeared. Along with the practical use of MPEG (MPEG2), which is a coding standard for digital AV data, DVD-RAM is expected as a recording / playback medium not only for computers but also in the audio / video (AV) technology field. A major challenge in the future is how to record AV data including image data using these optical disks aiming at increasing the capacity and to realize performance and new functions that greatly exceed conventional AV devices. In addition, AV equipment is more
Another challenge is to reduce the amount of memory installed and to realize functions that are easy to use and understand for general users who are not familiar with computer technology.

[0003] In a conventional DVD-RAM video recorder, primary text information and item text information are added to recorded video data by operating a device by the user himself. However, the input of the primary text information and the item text information is very troublesome.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is an EPG (multimedia database) which is a multimedia database constructed for the purpose of supplying information on programs transmitted by broadcasting or cable transmission. Erecto
ronic Program Guide) information or data broadcasting in digital broadcasting, to obtain information about the program to be recorded, to provide an information recording medium that can be recorded as primary text information or item text information, Another object of the present invention is to provide an apparatus and a method for recording and reproducing data on and from such an information recording medium.

[0005]

In order to solve the above problems, an information recording medium according to the present invention is an information recording medium for recording a video object and management information for managing reproduction of the video object. EP sent
It is characterized in that information on a program can be extracted and recorded from G information or data broadcasting in digital broadcasting.

In the information recording medium of the present invention,
The PG information or the information on the program extracted from the data broadcast may be recorded as primary text information.

Further, in the information recording medium of the present invention,
The PG information or the information on the program extracted from the data broadcast may be recorded as item text information.

[0008] Further, a recording apparatus of the present invention is a recording apparatus for recording information on the information recording medium, comprising: means for recording the video object; means for generating and recording the management information; It is characterized by comprising means for extracting information about a program from a data broadcast, and means for recording the extracted information about the program on the information recording medium as part of management information.

[0009] Further, a reproducing apparatus of the present invention is a reproducing apparatus for reproducing the information recording medium, wherein the reading means for reading the video object, the reading means for reading the management information, and the reading means for reading the management information. Means for reproducing the video object based on the management information, reading means for reading information on the program, means for generating a menu screen based on the read information on the program, It is characterized by comprising means for selecting, and means for reproducing the selected program.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a DVD disk, a DVD recorder and a DVD player which are embodiments of an information recording medium, a recording apparatus and a reproducing apparatus according to the present invention will be described in the following order with reference to the accompanying drawings.

1. 1. System outline of DVD recorder device 2. Overview of functions of DVD recorder device Overview of DVD Disc 4. Outline of AV information to be reproduced 5. Overview of management information and playback control of AV information 6. Basic operation of playback function 7. Basic operation of recording function Summary of the Invention Detailed Embodiment (1. System Overview of DVD Recorder) FIG.
FIG. 3 is a diagram illustrating an example of an external appearance of a VD recorder device and an interface between related devices. As shown in FIG.
The recorder is loaded with a DVD, which is an optical disk, and records and reproduces video information. The operation is generally performed with a remote control.

Video information input to a DVD recorder includes both an analog signal and a digital signal. Analog signals include analog broadcasting, and digital signals include digital broadcasting. In general, analog broadcasting is received and demodulated by a receiver built in a television device,
It is input to a DVD recorder as an analog video signal such as NTSC, and digital broadcasting is performed by STB (Serial) as a receiver.
The signal is demodulated into a digital signal by a t-top box and input to a DVD recorder and recorded.

On the other hand, a DVD disk on which video information is recorded is reproduced by a DVD recorder and output to the outside. As with the input, there are both analog and digital signals as well as the input. If the signal is an analog signal, it is directly input to the television device.
After being converted into an analog signal, it is input to a television device and displayed on the television device.

On a DVD disk, video information may be recorded / reproduced by a DVD camcorder other than the DVD recorder or a personal computer. Even if it is a DVD disc on which video information is recorded outside the DVD recorder, the DVD recorder reproduces the DVD disc when it is loaded into the DVD recorder.

It should be noted that audio information is usually attached to the above-mentioned video information of analog broadcasting and digital broadcasting. The accompanying audio information is similarly recorded and reproduced by the DVD recorder. The video information is generally a moving image, but may be a still image. For example, this is the case when a still image is recorded by the photograph function of a DVD camcorder. Note that STB
Digital I / F between DVD and DVD recorder is IEEE13
94, ATAPI, SCSI, etc.

Although the example between the DVD recorder and the television device is NTSC, which is a composite video signal, a component signal for separately transmitting a luminance signal and a color difference signal may be used. Further, as for a video transmission I / F between an AV device and a television device, research and development to replace an analog I / F with a digital I / F, for example, a DVI, is being promoted, and a DVD recorder and a television device have a digital I / F. / F is naturally expected to be connected.

(2. Outline of Functions of DVD Recorder) FIG. 2 is a block diagram showing functions of the DVD recorder. The drive device includes an optical pickup 101 for reading data from a DVD-RAM disk 100, an ECC (Erro
r Correcting Code) processing unit 102, track buffer 103, switch 104 for switching input / output of track buffer 103, encoder unit 105, and decoder unit 106.

As shown in FIG. 1, data is recorded on the DVD-RAM disc 100 with one sector = 2 KB as a minimum unit. Further, the ECC processing unit 12 sets 16 sectors = 1 ECC block in units of ECC blocks.
Is subjected to an error correction process.

The DVD recorder may include a semiconductor memory card or a hard disk drive as a data storage medium in addition to a DVD disk. FIG. 3 is a block diagram of a DVD recorder provided with a semiconductor memory card and a hard disk drive. Note that one sector may be 512B or 8KB. The ECC block also has one sector, 32 sectors,
It may be 64 sectors. It is expected that the sector size and the number of sectors constituting the ECC block will increase as the recordable information capacity increases.

The track buffer 103 is a DVD-RA
A buffer for recording AV data at a variable bit rate (VBR) in order to record AV data on the M disk 100 more efficiently. DVD-RAM disk 1
Since the read / write rate (Va) to 00 is a fixed rate, the bit rate (Vb) of AV data changes according to the complexity of its contents (image in the case of video). Is a buffer for absorbing the difference between

When the track buffer 103 is used more effectively, it is possible to arrange AV data discretely on the disk 100. This will be described with reference to FIG. FIG. 4A is a diagram showing an address space on a disk. As shown in FIG. 4A, the AV data is [a1, a2]
Is recorded separately in the continuous area of [a3, a4] and the continuous area of [a3, a4], the data stored in the track buffer is supplied to the decoder unit 106 while seeking from a2 to a3. Continuous reproduction of data becomes possible. FIG. 4B shows the state at this time.

The AV data whose reading has been started at the position a1 is input to the track buffer 103 at time t1, and the output of data from the track buffer 103 is started. As a result, the input rate (Va) to the track buffer and the output rate (V
Data is accumulated in the track buffer by the rate difference (Va-Vb) of b). This state continues until the search area reaches a2, that is, until time t2. Assuming that the amount of data stored in the track buffer 103 during this time is B (t2), B (t2) stored in the track buffer 103 from time t2 to time t3 when reading of data in the area a3 starts. Is only required to be supplied and supplied to the decoder 16. In other words, the amount of data read before seeking ([a1, a
If 2)) or more is secured, even if a seek occurs, continuous supply of AV data is possible.

The size of the continuous area in which AV data can be continuously supplied is expressed by the following equation when converted into the number of ECC blocks (N_ecc). In the equation, N_sec is the number of sectors constituting the ECC block, S_size is the sector size, and Tj is the seek performance (maximum seek time).

N_ecc = Vb * Tj / ((N_sec * 8 * S_size) * (1-Vb / V
a)) In addition, defective sectors may occur in the continuous area. Considering this case, the continuous area is represented by the following equation. In the equation, dN_ecc is the size of the defective sector to be accepted, and Ts is the time required to skip the defective sector in the continuous area. This size is also represented by the number of ECC blocks.

N_ecc = dN_ecc + Vb *
(Tj + Ts) / ((N_sec * 8 * S_size) * (1-Vb / V
a)) Here, an example in which data is read from the DVD-RAM, that is, the case of reproduction is described.
The same can be considered in the case of writing data to the memory, that is, in the case of recording. As described above, in the DVD-RAM, as long as data of a certain amount or more is continuously recorded, continuous reproduction / recording is possible even if AV data is recorded on a disk in a distributed manner. In DVD, this continuous area is called CDA.

(3. Overview of DVD Disc) FIG. 5 is a diagram showing the appearance and physical structure of a DVD-RAM disc which is a recordable optical disc. DVD-RAM
Is generally loaded into a DVD recorder while being housed in a cartridge. The purpose is to protect the recording surface. However, if the recording surface is protected by another configuration, or if it is acceptable, it may of course be arranged so that the recording surface can be directly loaded into the DVD recorder without being housed in the cartridge. DV
The D-RAM disk records data by a phase change method. Data recorded on the disk is managed in sector units,
Access address is attached. The 16 sectors serve as an error correction unit, are provided with an error correction code, and
It is called a C block.

FIG. 5A is a diagram showing a recording area of a DVD-RAM disc which is a recordable optical disc. As shown in the figure, the DVD-RAM disk has a lead-in area at the innermost circumference, a lead-out area at the outermost circumference, and a data area between them. The lead-in area is
A reference signal necessary for stabilizing the servo at the time of access of the optical pickup, an identification signal with another medium, and the like are recorded. The same reference signal as the lead-in area is recorded in the lead-out area. The data area is
It is divided into sectors (2048 bytes), which is the minimum access unit. In addition, DVD-RAM has a Z-CLV (Zone Constant Linear Ve
In order to realize rotation control called locity), the data area is divided into a plurality of zone areas.

FIG. 5A is a diagram showing a plurality of zone areas provided concentrically on a DVD-RAM. As shown in FIG.
It is divided into four zone areas. The rotational angular velocity of the DVD-RAM is set for each zone area so as to become faster in the zone on the inner peripheral side, and is kept constant while the optical pickup accesses in one zone. With this, DVD
-The recording density of the RAM is increased, and the rotation control during recording / reproduction is facilitated.

FIG. 5B is an explanatory diagram in which the lead-in area, the lead-out area, and the zone areas 0 to 23 shown concentrically in FIG. 5A are arranged in the horizontal direction. Each of the lead-in area and the lead-out area has a defect management area (DMA) therein.
The defect management area is an area in which position information indicating the position of a sector in which a defect has occurred and alternative position information indicating in which of the above-mentioned alternative areas a sector replacing the defective sector exists are recorded. .

Each zone area has a user area inside thereof, and has an alternative area and an unused area at the boundary. The user area refers to an area that can be used as a recording area by the file system. The replacement area is an area used when a defective sector exists.
The unused area is an area that is not used for data recording.
An unused area is provided for about two tracks. The unused area is provided because the sector address is recorded at the same position on an adjacent track in the zone, but the ZC
In the LV, since the recording position of the sector address is different in the track adjacent to the zone boundary, it is to prevent the sector address from being erroneously determined.

As described above, there are sectors not used for data recording at the zone boundaries. For this reason, the DVD-R is designed to continuously show only the sectors used for data recording.
AM is a logical sector number (LSN: Logicala) in order from the inner circumference.
l Sector Number) is assigned to a physical sector in the user area.

FIG. 6 shows a DV composed of logical sectors.
2 shows a logical data space of a D-RAM. The logical data space is called a volume space and records user data. The volume area manages recording data by a file system. That is, volume structure information for managing a group of sectors for storing data as a file and a group of files as a directory is recorded at the beginning and end of the volume area. The file system according to the present embodiment is called UDF and conforms to the ISO13346 standard. It should be noted that the group of sectors is not always arranged continuously in the volume space, but is partially arranged discretely. For this reason, the file system manages, as an extent, a group of sectors that are continuously arranged in the volume space among the sector groups that constitute the file, and manages the file as a set of related extents.

FIG. 7 shows the structure of directories and files recorded on the DVD-RAM. Under the route, VI
There is a DEO_RT directory under which files of various objects, which are data for reproduction, and VIDEO as management information indicating their reproduction order and various attributes.
Stores a Manager file. The object is data conforming to the MPEG standard, and includes PS_VOB,
There are TS1_VOB, TS2_VOB, AOB, and POB.

PS_VOB, AOB and POB are MPEG
TS1_VO
B and TS2_VOB are transport streams (T
S). The program stream has a data structure considering storage of AV information in a package medium, while the transport stream has a data structure considering communication media.

PS_VOB, TS1_VOB, TS2_
A VOB is an object that has both video information and audio information and is mainly composed of video information. Of these, TS
1_VOB is an object in which encoding is performed by a DVD recorder and the internal picture structure is managed in detail, and TS2_VOB is an object encoded outside the DVD recorder and has a data structure such as an internal picture structure. Unknown object.

Typically, TS1_VOB is an object in which an analog video signal input from the outside is encoded into a transport stream by a DVD recorder, and TS2_VOB is directly recorded on a disk without encoding a digital video signal input from the outside. The recorded object.

AOB and POB are MPEG program streams, AOB is an object mainly composed of audio information, and POB is an object mainly composed of still images.

The above-mentioned subject of video information and subject of audio information means that the assignment of the bit rate is large.
VOB is used for applications such as movies, and AOB
Is used for music applications.

(4. Outline of AV Information to be Reproduced) FIG.
FIG. 1 is a diagram showing the structure of MPEG data recorded as various AV objects on a DVD disk. As shown in FIG. 8, the video stream and the audio stream are respectively divided and multiplexed. In the MPEG standard, a stream after multiplexing is called a system stream. In the case of a DVD, a system stream in which information unique to the DVD is set is called a VOB (Video Object). The unit of division is called a packed packet, and has a data amount of about 2 Kbytes.

The video stream is coded according to the MPEG standard, is compressed at a variable bit rate, and has a high bit rate for a complex video such as a fast moving one. According to the MPEG standard, each picture of a video is
The pictures are coded by classifying them into pictures, P pictures, and B pictures. Of these, the I picture is subjected to spatial compression encoding that is completed within a frame, and the P picture and B picture are subjected to temporal compression encoding using correlation between frames. In MPEG, a section including at least an I picture is managed as a GOP (Group of Picture). The GOP becomes an access point in trick play such as fast-forward play. This is because it has an I-picture compressed in a frame. On the other hand, to encode an audio stream,
In the case of DVD, MPEG audio AAC, MP
In addition to AC3, encoding of AC3 or LPCM is used.

As shown in FIG. 8, a multiplexed data unit including video information constituting a GOP and accompanying audio information is called a VOBU (Video Object Unit). The VOBU may include information for managing the moving image section as header information. The system stream described in FIG. 8 includes a program stream (PS) and a transport stream (TS). The former has a data structure considering a package medium, and the latter has a data structure considering a communication medium.

FIG. 9 is a diagram for explaining the outline of the data structures of the program stream and the transport stream. The program stream is composed of fixed-length packs, which are the minimum units for transmission and multiplexing.
It has more than one packet. Both the pack and the packet have a header section and a data section. In MPEG, the data part is called a payload. In the case of DVD, the fixed length of the pack is 2 KB in conformity with the sector size. A pack can have a plurality of packets, but a pack that stores DVD video and audio has only one packet, so that one pack = 1 packet except in special cases.

On the other hand, the unit of transmission and multiplexing of the transport stream consists of fixed-length TS packets. TS
The size of the packet is 188B, which is compatible with ATM transmission, which is a communication standard. TS packet is 1
One or more collectively constitute a PES packet. The PES packet is a concept common to the program stream and the transport stream, and has a common data structure. The packet stored in the pack of the program stream is P
An ES packet is directly formed, and one or more TS packets of a transport stream are collected to form a PES packet.

The PES packet is the minimum unit of encoding, and stores video information and audio information which are commonly encoded. That is, video information and audio information of different encoding systems are not mixedly stored in one PES packet. However, if the same coding method is used, picture boundaries and audio frame boundaries are not guaranteed and both may be used. As shown in FIG.
One I picture is stored in an S packet,
A plurality of picture data may be stored in the ES packet.

FIGS. 10 and 11 show the individual data structures of the transport stream and the program stream. As shown in FIGS. 10 and 12, the TS packet is
It comprises an S packet header, an application field, and a payload part. The PID (Pack
et Identification), whereby various streams such as a video stream or an audio stream to which the TS packet belongs are identified.

The application field contains a PCR (Program Cloc).
k Reference) is stored. PCR is a reference value of the reference clock (STC) of the device that decodes the stream. The device typically demultiplexes the system stream at the timing of PCR and reconstructs it into various streams such as a video stream.

The PES header contains a DTS (Decoding Tim
e Stamp) and PTS (PresentationTime Stamp). DTS indicates the decode timing of the picture audio frame stored in the PES packet,
PTS indicates presentation timing such as video / audio output. Note that PTs are included in all PES packet headers.
It is not necessary to have S, DTS, and PTS,
With DTS, there is no problem in decoding and output.

The details of the structure of the TS packet are shown in FIG. As shown in FIG.
In addition to the above, a random access display flag is stored, and the flag indicates whether or not data corresponding to the head of a video / audio frame and being an access point is stored in a corresponding payload portion. Further, in addition to the above-described PID, the header part of the TS packet also stores a unit start display flag indicating the start of the PES packet, and applied field control information indicating whether or not an applied field follows.

FIG. 11 shows the structure of a pack constituting a program stream. Pack is SC in pack header
R and StreamID. The SCR is substantially the same as the PCR of the transport stream, and the StreamID is substantially the same as the PID. Since the data structure of the PES packet is common to the transport stream, PTS and DTS are stored in the PES header.

One of the major differences between the program stream and the transport stream is that the transport stream allows multi-programs. That is,
Although only one program can transmit a program stream in units of programs, the transport stream is assumed to transmit a plurality of programs at the same time. For this reason, in the transport stream, it is necessary for the playback device to identify either a video stream or an audio stream that constitutes a program for each program.

FIG. 13 shows a PAT for transmitting configuration information of an audio stream and a video stream constituting a program.
2 shows a table and a PMAP table. As shown in FIG. 13, the PMAP table stores information on a combination of a video stream and an audio stream used for each program, and the PAT table stores information on a combination of the program and the PMAP table. The playback device is P
A video stream and an audio stream constituting the program requested to be output can be detected from the AT table and the PMAP table.

Next, the above-described pack of the program stream and the arrangement of the TS packets of the transport stream on the disc will be described with reference to FIG.
As shown in FIG. 14A, 16 sectors form an ECC block. Pack (PSPa) that constitutes a video object (PS # VOB) in the form of a program stream
ck) are arranged at the sector boundary as shown in FIG. This is because both the pack size and the sector size are 2 KB.

On the other hand, a video object (TS1-VOB / TS2 # VOB) in the form of a transport stream is a unit having a size of 8 KB called a capsule.
It is arranged in the CC block. The capsule has an 18B header area, and 43 TS packets to which 6B ATS information is added are arranged in the data area. ATS information (Arrival Time Stamp information) is information generated and added by the DVD recorder, and indicates the timing at which the packet is externally transmitted to the DVD recorder.

(5. Overview of AV Information Management Information and Playback Control) FIGS. 15 and 16 show the data structure of a file called video management information (Video Manager) shown in FIG. The video management information includes object information indicating management information such as a recording position of various objects on a disc, and reproduction control information indicating a reproduction order of the objects.

FIG. 15 shows PS-VOB # 1 to PS-VOB # n and TS as objects recorded on the disc.
1-VOB # 1 to TS1-VOB # n, TS2-VOB
The case where # 1 to TS2-VOB # n are present is shown. As shown in FIG. 15, depending on the type of these objects, PS
An information table for -VOB, an information table for TS1-VOB, and an information table for TS2-VOB exist individually, and each information table has VOB information for each object.

The VOB information includes general information of the corresponding object, attribute information of the object, an access map for converting the reproduction time of the object into an address on the disk, and management information of the access map. I have. The general information includes identification information of the corresponding object, the recording time of the object, and the like. The attribute information includes video stream information (V_ATR) including the coding mode of the video stream, the number of audio streams (AST_Ns), And audio stream information (A_ATR) including a coding mode of the audio stream.

There are two reasons why an access map is required. The first is to prevent the reproduction path information from directly referring to the recording position of the object on the disk by a sector address or the like, and to be able to indirectly refer to the reproduction time of the object. In the case of a RAM medium, the recording position of the object may be changed by editing or the like. However, if the reproduction path information directly refers to the recording position of the object by a sector address or the like, the reproduction path information to be updated This is because the number increases. On the other hand, if the reproduction time is indirectly referred to, the reproduction path information need not be updated, and only the access map needs to be updated.

The second reason is that an AV stream generally has two references, a time axis and a data (bit string) axis, and there is no perfect correlation between these two references. For example, M which is an international standard for video streams
In the case of PEG-2 video, the use of a variable bit rate (a method of changing the bit rate according to the complexity of image quality) is becoming mainstream, and in this case, the proportionality between the amount of data from the head and the playback time is increasing. Since there is no relationship, random access based on the time axis cannot be performed. In order to solve this problem, the object information has an access map for performing conversion between a time axis and a data (bit string) axis.

As shown in FIG. 15, the reproduction control information has a user-defined reproduction path information table, an original reproduction path information table, and a title search pointer.

As shown in FIG. 16, the playback path includes the DV
There are two types: original definition reproduction path information that is automatically generated so that the D recorder indicates all objects recorded at the time of object recording, and user-defined reproduction path information that allows a user to freely define a reproduction sequence. The playback path is PGC information (Program Chain Informatio
n), the user-defined reproduction path information is U-PGC information, and the original reproduction path information is O-PG
It is called C information. Each of the O-PGC information and the U-PGC information is information that lists cell information, which is information indicating a cell that is a reproduction section of the object, in a table format. The playback section of the object indicated by the O-PGC information is called an original cell (O-CELL),
The playback section of the object indicated by the GC information is called a user cell (U-CELL). The cell indicates the reproduction section of the object by the reproduction start time and the reproduction end time of the object, and the reproduction start time and the reproduction end time are converted into the actual recording position information of the object on the disk by the access map described above.

As shown in FIG. 16B, a group of cells indicated by the PGC information constitutes a series of reproduction sequences that are sequentially reproduced according to the entry order of the table.

FIG. 17 shows objects, cells, PGCs,
FIG. 3 is a diagram specifically illustrating a relationship between access maps. As shown in FIG. 17, the original PGC information 50 includes at least one piece of cell information 60, 61, 62, 63.
The cell information 60... Specifies an object to be reproduced, and specifies the object type and the reproduction section of the object. The recording order of the cell information in the PGC information 50 indicates the reproduction order when the object specified by each cell is reproduced.

One piece of cell information 60 includes type information (Type) 60a indicating the type of the object designated by the cell information 60.
And an object ID which is object identification information
(Object ID) 60b and start time information (Start_PTM) 60c in the object on the time axis
And end time information (En) in the object on the time axis.
d_PTM) 60d.

At the time of data reproduction, the cell information 60 in the PCG information 50 is sequentially read, and the object specified by each cell is reproduced for the reproduction section specified by the cell.

The access map 80c converts the start time information and the end time information indicated by the cell information into position information of the object on the disk.

The map information described above is generated and recorded together with the object at the time of recording. In order to generate a map, it is necessary to analyze the picture structure in the data of the object. Specifically, it is necessary to detect the position of the I picture shown in FIG. 9 and to detect time stamp information such as PTS, which is the reproduction time of the I picture shown in FIGS. 10 and 11.

Here, a description will be given of a problem that occurs when map information of PS-VOB, TS1-VOB, and TS2-VOB is generated. PS-VOB, TS1-VOB
Is mainly generated by a DVD recorder encoding a received analog broadcast into an MPEG stream as described with reference to FIG. Therefore, the information of the I picture and various time stamps is generated by itself,
The data structure inside the stream is clear to the VD recorder, and there is no problem in generating map information.

Next, regarding TS2-VOB, as described with reference to FIG.
The D recorder directly records on the disk without encoding. For this reason, unlike the PS-VOB, the position and time stamp information of the I picture are not generated by themselves, so that the data structure inside the stream is not clear for the DVD recorder, and the information is detected from the digital stream to be recorded. Is required.

For this reason, the DVD recorder uses a TS that records a stream encoded outside the recorder.
As for 2-VOB map information, an I picture and a time stamp are detected as follows. First, the detection of the I picture is performed by detecting the random access display information of the application field of the TS packet shown in FIG.
The detection of the time stamp is performed by detecting the PTS of the PES header. For the time stamp, instead of the PTS, use the PCR in the application field.
Alternatively, the ATS, which is the arrival timing at which the TS packet is transmitted to the DVD recorder, may be used instead. In any case, the DVD recorder does not analyze the data structure of the video layer of the MPEG stream, but detects the position of the I picture based on the information of the system layer which is the upper layer. This is because the load on the system is large to perform the analysis of the video layer to generate the map information.

In some cases, it is impossible to detect the system layer. In this case, since no map information can be generated, it is necessary to indicate that there is no valid map information. In the DVD recorder, these are indicated by the map management information shown in FIG. As shown in FIG. 15B, the map management information has map validity information and a self-encoding flag. The self-encoding flag indicates that the object is an object encoded by the DVD recorder itself, indicates that the internal picture structure is clear, and indicates that the time stamp information of the map information and the position information of the I picture are accurate. The map validity information indicates whether there is a valid access map.

Examples of cases where the system layer cannot be detected include a case where no applicable field is set and a case where a digital stream is not an MPEG transport stream in the first place. Since various formats of digital broadcasting can be established in countries around the world, it is naturally expected that DVD recorders record objects for which maps cannot be generated. For example, DV assuming digital broadcasting in Japan
When a D recorder is used in the United States and a digital broadcast in the United States is recorded, there are cases where an object for which a map cannot be generated is recorded.

However, the DVD recorder can reproduce the objects for which no map information is generated, sequentially from the beginning. In this case, by outputting the recorded digital stream to the STB corresponding to the stream via the digital I / F, the video can be reproduced.

Next, the primary text information will be described. Primary text information is a program,
It is described in the playlist and the selected entry point, and is used to identify the program, the playlist, and the selected entry point. Primary text information is "ISO /
IEC646: 1983 (ASCII) "and another character set.

FIG. 18 shows an example of using primary text information. In this example, the player reads the primary text information of all programs,
The figure shows that the user can easily select a program to be reproduced.

The specific data structure of the primary text information will be described below. The size of the primary text information is 128 bytes, which is divided into two subfields. The first subfield is 64 bytes, the second
The subfield is also 64 bytes. The first subfield includes ISO / IEC646: 1983 (ASCI
The primary text information is described in the character set I), and the primary text information is described in another character set defined in the video management information in the second subfield.

Here, if the character set in the video management information is “00h”, it is assumed that the primary text information is not recorded in the second subfield. Both the first and second subfields are filled with text data, and if either subfield is not used for describing primary text information, that subfield is filled with '00h'. If the primary text data is 64 bytes or less, the rest is '00
h '.

Next, item text information will be described. The item text information is used as auxiliary information with respect to the primary text information.
9 (a). FIG.
In (a), a character set represents a character code used for describing text data. Also,
The Identifier Code is for identifying the category of the text information, and an example of the Identifier Code is shown in FIG. Such item text information is referred to as a link by a search pointer from the corresponding primary text information.

(6. Basic Operation of Reproduction Function) Next, FIG.
A reproduction operation of a DVD recorder player that reproduces the above-mentioned optical disk using will be described. As shown in FIG. 20, the player has an optical pickup 201 for reading data from the DVD-RAM disk 100, an ECC processing unit 202 for performing error correction on the read data, and temporarily stores the read data after error correction. Track buffer 203 and moving image object (PS_VOB)
Decoder 20 for reproducing a program stream such as
5 and a TS decoder 20 for reproducing a transport stream of a digital broadcast object (TS1_VOB)
6, an audio decoder 207 for reproducing an audio object (AOB), and a still image object (P
OB), a switch 210 for switching data input to each of the decoders 205, 206,..., And a control unit 211 for controlling each part of the player
And

Data recorded on the DVD-RAM disk 100 is read from the optical pickup 201 and passed through the ECC processing unit 202 to the track buffer 20.
3 is stored. The data stored in the track buffer 203 includes a PS decoder 205, a TS decoder 206,
The signal is input to one of the audio decoder 207 and the still image decoder 208, decoded, and output. At this time,
The control unit 211 determines data to be read based on the reproduction sequence indicated by the reproduction path information (PGC) shown in FIG. That is, in the example of FIG.
First, the partial section (CELL # 1) of OB # 1 is reproduced,
Next, control is performed to reproduce the partial section (CELL # 2) of VOB # 3 and finally reproduce it as VOB # 2 (CELL # 3).

The control unit 211 can acquire the type of the cell to be reproduced, the corresponding object, the reproduction start time of the object, and the reproduction end time from the cell information of the reproduction path information (PGC) shown in FIG. . The control unit 211 inputs the data of the section of the object specified by the cell information to a suitable decoder. On this occasion,
The control unit 211 specifies an object to be reproduced based on the Object ID of the cell information. Further, the control unit 2
Reference numeral 11 denotes a cell which is a reproduction section of the specified object, by using StartPTM and EndPTM of the cell information.
Is converted to the address of the disk information using the access map of the corresponding VOB information.

The player according to the present embodiment further comprises:
It has a digital interface 204 for supplying an AV stream to the outside. As a result, the AV stream can be supplied to the outside via a communication protocol such as IEEE1394 or IEC958. This is especially true for TS2-VOBs that have not encoded themselves.
Since there is a case where the corresponding decoder does not exist inside the player, the external S
It can be output to a TB and played back on that STB.

When directly outputting digital data to the outside, the control section 211 determines whether random access reproduction is possible or not based on the map management information shown in FIG.
If the access point information flag is valid, the access map has the position information of the I picture. Therefore, if there is a request for fast-forward playback or the like from an external device, the control unit 211 can output digital data including an I picture to the external device via the digital I / F.
If the time access information flag is valid, time access is possible. Therefore, in response to a time access request from an external device, the control unit 211 can output digital data including picture data corresponding to the designated reproduction time to the external device via the digital I / F. .

(7. Basic Operation of Recording Function) Next, FIG.
The configuration and operation of a DVD recorder according to the present invention, which records and reproduces data on and from the optical disk by using a DVD, will be described. As shown in FIG. 21, the DVD recorder displays a user ID and receives a request from the user.
/ F section 222, a system control section 212 for managing and controlling the entire DVD recorder, an analog broadcast tuner 213 for receiving VHF and UHF, an encoder 214 for converting an analog signal into a digital signal and encoding it into an MPEG program stream, digital satellite broadcasting , A digital broadcast tuner 215, an analyzer 216 for analyzing an MPEG transport stream sent by a digital satellite, a display 217 such as a television and a speaker,
A decoder 218 for decoding the AV stream. The decoder 218 includes the first and second decoders shown in FIG. The DVD recorder further includes a digital I / F unit 219, a track buffer 220 for temporarily storing write data, and a drive 221 for writing data to the DVD-RAM disk 100. The digital I / F unit 219 is an interface that outputs data to an external device by a communication unit such as IEEE1394.

In the DVD recorder thus configured, the user I / F section 222 first receives a request from the user. The user I / F unit 222 transmits a request from the user to the system control unit 212, and the system control unit 212
Interprets the request from the user and makes a processing request to each module.

Recording includes self-encoding in which input digital data is encoded by itself, and outside encoding in which encoded digital data is recorded on a disk without encoding.

(7.1 Recording Operation by Self-Encoding) First, for self-encoding recording, the operation of encoding and recording an analog broadcast to PS-VOB will be specifically described below. System control unit 2
12 requests reception to the analog broadcast tuner 213 and encoding to the encoder unit 214.

The encoder 214 video-encodes the AV data sent from the analog tuner 213,
Audio encoding and system encoding are performed and sent to the track buffer 220. Encoder section 214
Is the MPE that is encoding immediately after encoding starts.
The time stamp information of the head data of the G program stream is converted to the reproduction start time (PS_VOB_V_S_P
TM) to the system control unit 212, and then sends information necessary for creating an access map to the system control unit 212 in parallel with the encoding process. This value is
Start_P of cell information shown in FIG. 17 generated later
Set to TM. The time stamp information is generally PTS, but may be replaced by SCR.

Next, the system control unit 212
21, and the drive 221 extracts the data stored in the track buffer 220 and
The data is recorded on the VD-RAM disk 100. At this time, the above-mentioned continuous area (CDA) is searched from the recordable area on the disc, and data is recorded in the searched continuous area.

The end of recording is instructed by a stop request from the user. The recording stop request from the user is transmitted to the system control unit 212 through the user I / F unit 222, and the system control unit 212
3 and a stop request is issued to the encoder unit 214.

The encoder 214 has a system controller 212
In response to the request to stop encoding, the encoding process is stopped, and the time stamp information included in the end data of the MPEG program stream that was finally encoded is sent to the system control unit 212 as the reproduction end time (PS_VOB_V_E_PTM). This value is set in End_PTM of the cell information shown in FIG. PTS is usually set as the time stamp information, but SCR may be used instead.

After the encoding process is completed, the system control section 212 uses the information received from the encoder 214 to generate the PS-VOB VOB information (PS-VOB information) shown in FIG.
VOBI) and playback control information. Here, the generated VOB information includes an access map suitable for the object type and map management information. System control unit 21
2 sets the map validity information of the map management information to valid and turns on the self-encoding flag.

As the reproduction control information, an original reproduction path (O-PGC information) shown in FIG. 16 in which the recorded object is one of the reproduction targets is generated. The generated O-PGC information is added to the original reproduction path table. The original reproduction path (O-PGC information) has cell information. The type information of the cell information includes "PS-VO
B ”is set.

Lastly, the system control unit 212 requests the drive 221 to end the recording of the data stored in the track buffer 220 and to record the PS-VOB VOB information (PS_VOBI) and the reproduction control information. The drive 221 stores the remaining data in the track buffer 220 and these information on the DVD-RAM disk 100.
And the recording process ends.

Note that the analog broadcast may be encoded into TS1-VOB. In this case, encoder 2
14 converts an analog signal into a digital signal,
The encoder must encode the transport stream, and the type information in the cell information is “TS1
−VOB ”.

(7.2 Recording Operation by Outside Encoding) Next, recording by outside encoding will be specifically described through the operation of recording a digital broadcast. In this case, the type of the recorded object is TS2-VOB.

A digital broadcast recording request by a user is transmitted to the system control unit 212 through the user I / F unit 222. The system control unit 212 requests reception to the digital broadcast tuner 215 and data analysis to the analysis unit 216. MPE sent from digital broadcast tuner 215
The G transport stream is transferred to the track buffer 220 through the analysis unit 216. The analysis unit 216
An encoded MPEG transport stream (TS2-VOB) first received as a digital broadcast
As the information necessary for generating the VOB information (TS2_VOBI), the time stamp information of the leading data of the transport stream is included in the start time information (TS2_VOB).
_V_S_PTM), and the system control unit 21
Send to 2. The start time information is set in Start_PTM of the cell information generated later and shown in FIG. This time stamp information becomes PCR or PTS. Also,
ATS, which is the timing when the object is transmitted to the DVD recorder, may be used instead.

[0097] The analysis unit 216 further analyzes the system layer of the MPEG transport stream and detects information necessary for creating an access map. Regarding the position of the I picture in the object, as described above, the random access indicator (random_ac) in the adaptation field in the TS packet header is used.
ses_indicator).

Next, the system control unit 212
The drive 221 outputs a recording request to the track buffer 220 and records the data on the DVD-RAM disk 100. At this time, the system control unit 212 instructs the drive 221 on the basis of the allocation information of the file system where to record on the disc. At this time, the above-mentioned continuous area (CDA) is searched from the recordable area on the disc, and data is recorded in the searched continuous area.

The end of recording is instructed by a stop request from the user. The recording stop request from the user is transmitted to the system control unit 212 through the user I / F unit 222, and the system control unit 212
5 and a stop request is sent to the analysis unit 216.

The analysis unit 216 receives the analysis stop request from the system control unit 212, stops the analysis processing, and displays the time stamp information included in the data of the end section of the last analyzed MPEG transport stream at the display end time (TS
2_VOB_V_E_PTM) as the system control unit 2
Send to 12. This value corresponds to the End of the cell information shown in FIG.
_PTM is set. This time stamp information is P
CR or PTS. Alternatively, ATS, which is the timing at which the object is transmitted to the DVD recorder, may be used instead.

After the digital broadcast receiving process is completed, the system control unit 212, based on the information received from the analysis unit 216, uses the TS2-VOB VOB information (T
S2_VOBI) and playback control information. here,
The generated VOB information includes an access map suitable for the object type and map management information. The system control unit 212 can detect the position of the I picture in the object, and generate a valid access map.
Set the map validity information of the map management information to valid.
The self-encoding flag is set to OFF.
If a valid access map cannot be generated, the map validity information is set to invalid. As a case where a valid access map cannot be generated, a case where an unsupported digital broadcast is received, a case where there is no random access information in an applicable field, and the like are considered. Also,
When directly input from the digital I / F, there may be a case where the stream is not an MPEG transport stream. In this case, the map validity information is set to be invalid.

As the reproduction control information, an original reproduction path (O-PGC information) shown in FIG. 16 in which the recorded object is one of the reproduction targets is generated. The generated O-PGC information is added to the original reproduction path table. The original reproduction path (O-PGC information) has cell information. The type information of the cell information includes "TS2-VO
B ”is set.

Lastly, the system control unit 212 requests the drive 221 to end the recording of the data stored in the track buffer 220 and to record the VOB information (TS2_VOBI) for TS2-VOB and the reproduction control information. The drive 221 stores the remaining data in the track buffer 220 and these information on the DVD-RAM disk 100.
And the recording process ends.

The operation has been described above based on the recording start and end requests from the user. For example, in the case of timer recording used in a VTR, the system control unit automatically starts recording instead of the user. And an end request are issued, but the operation of the DVD recorder is not essentially different.

(8. Outline of the Invention) Next, the outline of the present invention will be described. The present invention obtains information on a program to be recorded from EPG information and data broadcasting in digital broadcasting when a broadcast is recorded as described in (7. Basic operation of recording function), and outputs primary text information and An information recording medium that can be recorded as item text information and a recording device that enables such recording are provided. In addition, the present invention also provides a reproducing apparatus that reads primary text information and item text information from the information recording medium, generates a menu screen based on the information, and enables easy selection and reproduction of recorded information.

(9. Detailed Embodiment) It is assumed that information broadcast on a DVD-RAM disk is recorded as described in (7. Basic operation of recording function). At this time, the primary text information is obtained from the EPG information and recorded as shown in the flowchart of FIG.

First, the recording device receives a broadcast to be recorded (step 501). Here, EPG is added to the received broadcast.
It is determined whether or not information is included (step 50).
2). If the EPG information is not included in step 502, the process proceeds to step 511, and the broadcast information is stored in the DVD as described in (7. Basic operation of recording function).
-Record on RAM disk and finish. Step 502
In the case where EPG information is included, the EPG information is analyzed to obtain necessary information (step 50).
3). The information acquired at this time includes program title information, broadcast date and time information, program time information, channel information, regional information, genre information, cast information, digest information, and other additional information.

Next, the video data received by the recording device is recorded on a DVD-RAM disk (step 504),
The information obtained in step 503 is recorded as primary text information in the video data management area of the DVD-RAM disk (step 505), and the process ends. When recording the primary text information, the acquired data is recorded in the data structure described in (5. Management information of AV information and outline of reproduction control). If there is a change in the EPG information in the program, steps 504 and 505 may be repeated there.

FIG. 23 shows the data structure of the EPG information.
The data structure of the EPG is not limited to the one shown in FIG. 23 and may have another data structure as long as it shows details of a broadcast program. In the present embodiment, a DVD-RAM disk has been described, but the present invention may be applied to other optical disks, hard disk drives, magnetic recording devices, and semiconductor memories.

It is assumed that the program information may be obtained by analyzing a data broadcast in a digital broadcast instead of the EPG information. Of course, it may be obtained from both EPG information and data broadcasting. The data structure of the data broadcast at this time is ARIB (Association of Radio Industries).
and Business), ATSC (Advanced Television Syst
em Committee), DVB (Digital Video Broadcast)
Shall conform to the specifications specified in In particular, in the case of ARIB, as shown in FIGS. 24 and 25, program information can be obtained by analyzing a descriptor in an EIT (Event Information Table).

It should be noted that whether or not a data broadcast is included is determined especially by the PMT in the case specified by ARIB.
(Program Map Table) It is possible to determine whether or not the data coding system descriptor is arranged in the component described in the second loop. Good.

Note that the obtained program information may be recorded as item text information instead of primary text information. At this time, the program information is converted into the data structure of the item text information shown in FIG. 19 and recorded. Of course, when the menu is generated, it may be obtained from both the primary text information and the item text information.

Note that flag information for identifying primary text information and item text information automatically created by a device may be included in the management information of the information recording medium. For example, in the case of item text information, it is assumed that the item text information is stored in Text DataManager as shown in FIG. In this case, the flag is provided in the search pointer, but the Identifier in the item text is
You may have it in Code.

[0114]

According to the prior art, primary text information, which is identification information for information recorded on an information recording medium,
Although it was necessary for a human to input and add item text information, the present invention makes it possible to acquire information on a program from EPG information and data broadcasting in digital broadcasting and automatically add the information. By using this text information as a menu screen at the time of reproduction, it becomes easy to search for a program to be reproduced.

[Brief description of the drawings]

FIG. 1 is a view for explaining an example of the external appearance of a DVD recorder device and an interface with related devices;

FIG. 2 is a block diagram of a drive device of the DVD recorder.

FIG. 3 is a block diagram of a drive device of a DVD recorder having an HDD and a semiconductor memory;

FIG. 4 is a view for explaining a continuous area on a disk and a data storage amount in a track buffer;

FIG. 5 is a diagram for explaining the external appearance and physical structure of a disk.

FIG. 6 is a view for explaining a logical data space of a disk;

FIG. 7 is a view for explaining the directory and file structure of a disk.

FIG. 8 is a diagram showing a configuration of a video object.

FIG. 9 is a view for explaining an MPEG system stream.

FIG. 10 illustrates an MPEG-TS stream.

FIG. 11 is a diagram for explaining an MPEG-PS stream.

FIG. 12 illustrates a TS packet.

FIG. 13 illustrates a PAT table.

FIG. 14 is a view for explaining the arrangement of video objects on a disc.

FIG. 15 illustrates a data structure of video management information.

FIG. 16 is a view for explaining the data structure of video management information.

FIG. 17 is a view for explaining the relationship between PGC information, object information, and objects of video management information.

FIG. 18 is a view for explaining the concept of primary text information.

FIG. 19 is a view for explaining the data structure of item text information.

FIG. 20 is a block diagram showing a functional configuration of a playback device.

FIG. 21 is a block diagram illustrating a functional configuration of a recording apparatus.

FIG. 22 is a flowchart for acquiring and recording program information from EPG information.

FIG. 23 is a data structure diagram of EPG information.

FIG. 24 is a data structure diagram of EIT.

FIG. 25 is an explanatory diagram of a descriptor in an EIT.

FIG. 26 is a diagram showing an example of an automatically generated flag in item text information.

[Explanation of symbols]

 Reference Signs List 100 DVD-RAM disk 101, 201 Optical pickup 102, 202 ECC processing unit 103, 203, 220 Track buffer 104, 210 Switch 105, 214 Encoder 106, 205, 206, 218 decoder 207 Audio decoder 208 Still image decoder 211 Control unit 212 System control unit 213 Analog broadcast tuner 215 Digital broadcast tuner 216 Analysis unit 217 Display unit 219 Digital I / F unit 221 Drive 222 User I / F unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/85 H04N 5/85 Z 5/92 5/92 H 5/93 5/93 E 7/025 7 / 08 A 7/03 7/035 (72) Inventor Hirofumi Hamasaka 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 5C052 AA04 CC11 DD04 DD06 FA04 FA05 FB01 FB05 GC05 5C053 FA25 GA11 GB37 JA22 LA01 LA07 LA11 5C063 AB03 AB07 DA07 DA13 5D044 AB05 AB07 BC06 CC04 DE02 DE48 DE57 GK08 5D110 AA17 AA26 AA28 DA11 DE01

Claims (5)

[Claims] An information recording medium for recording a video object and management information for managing the reproduction of the video object, wherein the information recording medium is an EPG (Elect) transmitted from a broadcast station.
(Ronic Program Guide) An information recording medium capable of extracting and recording information on a program from information or data broadcasting in digital broadcasting. 2. The information recording medium according to claim 1, wherein the EPG information or the information on the program extracted from the data broadcast is recorded as primary text information. 3. The information recording medium according to claim 1, wherein EPG information or information on the program extracted from data broadcasting is recorded as item text information. 4. A recording apparatus for recording information on an information recording medium according to claim 1, wherein: means for recording the video object; means for generating and recording the management information;
A recording apparatus comprising: means for extracting information about a program from EPG information and data broadcasting; and means for recording the extracted information about the program on the information recording medium as part of management information. 5. A reproducing apparatus for reproducing the information recording medium according to claim 1, wherein said reading means reads said video object, said reading means reads said management information, and said reading means reads out said management information. Means for playing the video object based on management information;
Reading means for reading information on the program, means for generating a menu screen based on the read information on the program, means for selecting a program from the menu screen, and means for reproducing the selected program. A playback device, comprising: