MXPA01009020A - Information recording medium, apparatus and method for recording or reproducing the recording medium - Google Patents

Abstract

An information recording medium suitable for an optical disc such as DVD, which is capable of reading quickly the recording time information of the videodata for displaying on the menu. The recording medium stores management information (RTR.IFO) for each stream data. The management information includes a recording time information (VOB_REC_TM) that has a date and time at which the head video frame of the stream data is recorded. The management information also has an error information (VOB_REC_TM_SUB) indicative of error or fraction of the recording time information which indicates a time less than 1 second and is generated on edit operations including partial deletion.

Description

MEDIA RECORDING INFORMATION, APPARATUS AND METHOD FOR RECORDING OR REPRODUCING THE RECORDING MEDIA Technical Field The present invention relates to an information recording medium similar to an optical disc capable of being read / written on it and more particularly to a medium of recording in which multimedia data including movie data, an apparatus and a method for recording or reproducing the medium are stored. BACKGROUND OF THE ART In the field of a recordable optical disc having an upper limit of approximately 650 MB, a DVD-RAM disk of phase change type having a capacity of several GB has appeared. In addition, in addition to the practical use of MPEG (MPEG2), which is the standard for digital AV data encoding, DVD-RAM has been provided as a means of recording and playback in the AV field as well as the computer application. In other words, it is expected that the DVD-RAM will be broadcast as a medium instead of the magnetic tape, which is conventionally the typical AV recording medium. (DVD-RAM description) In recent years an increase in the density of a recordable optical disc has been developed, in such a way that it becomes possible to record video data as well as computer data and audio data. For example, a convex-concave guide groove has conventionally been formed in the signal recording face of the optical disc. While the signal has conventionally been recorded in only a flat portion or in a groove portion, it has become possible to record the signal in both the flat and the groove portion, by a flat-groove part recording method. Consequently, the recording density has been increased to approximately twice as much (see, for example, Japanese Patent Laid-open Publication No. 8-7282). In addition, a CLV or similar method has been devised and used, in which the control of a CLV (constant linear velocity recording) method, effective in an increase in recording density, can be simplified and easily used in a practice (see for example, Japanese Patent Laid-Open Publication No. 7-93873). They will be big problems in the future, how to record AV data including video data using an optical disc destined to have an increase in capacity and how to implement the performance that far exceeds a conventional AV device and new functions. By the appearance of such a recordable optical disc having a large capacity, it can be assumed that an optical disc also becomes the primary means for AV recording and playback instead of a conventional tape. The conversion of the recording media from the tape to the disc has several influences on the function and performance of an AV device. The conversion to disk has the great feature that the random access performance was considerably improved. If the tape is subjected to random access, it is usually necessary to take a time of the order of several minutes for a rewind. This is extraordinarily slow compared to the search time (20-60 ms or less) in the optical disc medium. According to the foregoing, the tape can not act as a random access device with respect to practical use. By such random access performance, the distributed recording operation of the AV data that can not be carried out by the conventional tape, can be implemented by the optical disk. Figure 34 is a block diagram showing a disk drive device of a DVD burner. In the drawing, the reference numeral 11 denotes an optical reader for reading the data of a disk, the reference numeral 12 denotes an ECC processing section (error correction code), the reference numeral 13 denotes a buffer of track, the reference numeral 14 denotes a switch for switching the input and the output to and from the track buffer, the reference numeral 15 denotes an encoder, and the reference numeral 16 denotes a decoder. The reference numeral 17 denotes an enlarged part of the disk. As shown by reference numeral 17, the data is recorded on the DVD-RAM with 1 sector = 2 KB as the minimum unit. In addition, an error correction process is executed through the ECC processing section 12 with 16 sectors = 1 ECC block. The track buffer shown by the reference numeral 13 serves to record the AV data with a variable bit rate in order to record the AV data more efficiently on the DVD-RAM disc. While a read / write ratio ("Va" in the drawing) from / to the DVD-RAM is a fixed rate, the AV data changes the bit rate ("Vb" in the drawing) according to the complexity of their contents (a video image, for example). The track buffer 13 serves to absorb the difference in the bit rate. For example, this is not required if the AV data is set at the fixed bit rate as in a video CD. By using the track buffer 13 still effectively, the AV data can be discretely provided on the disk. The description will be given with reference to Figure 35. Figure 35A is a diagram showing an address space on a disk. In the case where the AV data is recorded separately in a continuous region of [al, a2] and a continuous region of [a3, a4] as shown in Figure 35A, the AV data can be continuously reproduced by providing data stored in the track buffer 13 to decoder 16 while a search is carried out from a2 to a3. The status obtained in this time is shown in Figure 35B. The AV data read from it are input to the track buffer 13 and are output from the track buffer 13 at time ti, and the data is stored in the track buffer 13 by a ratio difference (Va- Vb) between an input ratio (Va) to the track buffer 13 and an output ratio (Vb) from the track buffer 13. This state continues up to a2 (time t2). When a quantity of data stored in the track buffer 13 for this period of time is represented by B (t2), it is sufficient that the quantity B (t2) stored in the track buffer 13 can be consumed to continuously supply the decoder 16 up to a time t3, corresponding to the data read start point of a3. In other words, if a constant amount of data is kept ([al, a2]) to be read before the search or more, the AV data can be continuously provided even if the search is generated. In the previous example, the description is given in the case where the data is read from the DVD-RAM (ie, playback), however the case in which the data is recorded in the DVD-RAM (ie, recording image) can be considered similarly. If the constant amount or more of the data is continuously recorded on the DVD-RAM as described above, image recording / continuous playback can be performed even if the AV data is distributed and recorded on the disc. (Description of MPEG) The description of the AV data will be given below. As described above, the AV data to be recorded on the DVD-RAM uses an international standard referred to as MPEG (ISO / IEC13818). Even a DVD-RAM that has a large capacity of several GBs does not always have enough capacity to faithfully record uncompressed digital AV data. Therefore, a method is required to compress and record the AV data. As a method for compressing AV data, MPEG (ISO / IEC13818) has been widely disseminated throughout the world. In recent years, LSI technology has been improved - so that MPEG encoding / decoding (LSI expansion / compression) has been put to practical use. Consequently, the DVD recorder can implement MPEG expansion / compression. The MPEG mainly has the following two characteristics in order to implement highly efficient data compression. A first characteristic is that the compression method that uses a time-correlation characteristic between frames is introduced, in addition to a compression method that uses a space frequency characteristic that has conventionally been carried out in the compression of the moving image data. In the MPEG each frame (which will also be referred to as an image in the MPEG) is classified into three kinds of parts, that is, an I image (intra-frame coding image), an image P (an image that uses intra-frame coding and a reference relationship in the past), and an image B (an image that uses intra-frame coding and reference relationships in the past and future), thus performing data compression. Figure 36 is a diagram showing a relationship between images I, P and B. As shown in Figure 36, the image P refers to the last image I or P in the past, and image B refers to the closest I or P image in the past and in the future. As shown in Figure 36, in addition, since image B refers to the I or P image in the future, the order of deployment (deployment order) of each image and the order (coding order) in the data tablets can be coincident with each other. A second feature of MPEG is that the amount of coding can be allocated dynamically for each image according to the complexity of the image. The MPEG decoder comprises an input buffer. The decoder can allocate a large amount of coding to a complex image difficult to compress by storing data in the decoder buffer in advance. The audio data used by the DVD-RAM can be selected to be used from three kinds of parts, ie MPEG audio to perform data compression, Dolby digital (AC3) and uncompressed LPCM. While the digital Dolby and the LPCM have a fixed bit rate, the MPEG audio has a variable bit rate and has a size that is not as large as the size of the video stream but can be selected from several kinds of sizes in an audio frame unit. Such AV data is multiplexed in a stream by the method referred to as MPEG system. Figure 37 is a diagram showing the structure of the MPEG system. The reference numeral 41 denotes a packet header, the reference numeral 42 denotes a packet header, and the reference numeral 43 denotes information fields. The MPEG system has a hierarchical structure that is referred to as set (pack) and packet (packet). The packet comprises the packet header 42 and the information fields 43. The AV data is divided by appropriate size from the head and stored in the information fields 43. The packet header 42 stores the ID (stream ID) to identify stored data, a decoding time DTS (Decoding Time Stamp) of data (the DTS is skipped if the decoding and the unfolding are carried out at the same time as in the audio data) and a presentation time PTS (Mark) of Presentation Time) of the data that are included in the information fields represented with an accuracy of 90 kHz, are recorded as information related to the AV data stored in the information fields 43. The set (pack) is a unit that it has a plurality of packages together. In the case of DVD-RAM, one set is used per package. Therefore, the set comprises the set header 41 and the packet (the packet header 42 and the information fields 43). The set header stores SCR (System Clock Reference) which represents, with an accuracy of 27 Mhz, a time when the data in the set is entered into the buffer of the decoder. On DVD-RAM, such an MPEG system stream is recorded using a set as a sector (= 2048 B). Next, a description of a decoder will be given to decode the MPEG system stream mentioned above. Figure 38 shows a decoder model (P-STD) of the MPEG system decoder. The reference numeral 51 denotes an STC (System Time Clock) that acts as a reference time in the decoder. The reference numeral 52 denotes a demultiplexer for decoding or demultiplexing a system current. The reference numeral 53 denotes an input buffer of a video decoder. The reference numeral 54 denotes a video decoder. The reference numeral 55 denotes a reordering buffer for temporarily storing the I and P images to absorb the difference between the order of data and the display order that is made between the I and P images and the B image as described above. . The reference numeral 56 denotes a switch for adjusting the order of the outputs of the I and P images stored in the reordering buffer and the image B. The reference numeral 57 denotes an input buffer of an audio decoder. The reference numeral 58 denotes an audio decoder. Such an MPEG system decoder serves to process the MPEG system stream mentioned above in the following manner. At the time when the STC 51 time is coincident with the SCR described in the set header, the demultiplexer 52 introduces the same set. The demultiplexer 52 serves to interpret a current ID in the packet header and to transfer the data from the information fields to the buffer of the decoder for each stream. In addition, the demultiplexer 52 collects the PTS and the DTS in the packet header. The video decoder 54 collects the image data from the video buffer 53 at the moment when the time of the STC 51 is coincident with the DTS to carry out a decoding process, and stores the I and P images in the memory intermediate reordering 55 and displays the image B. While the I and P images are decoded in the video decoder 54, the switch 56 is connected to the reordering buffer 55 to output a previous I or P image in the buffer rearrangement 55. While image B is decoded, switch 56 is connected to video decoder 54. Audio decoder 58 collects and decodes data for an audio frame from the audio buffer 57 to the time when the STC time 51 and the PTS (there is no DTS in the audio part) are coincident with each other in the same way as the video decoder 54. A description of the method for multiplexing the video is given below. MPEG system stream with reference to Figures 39A-39D. Figure 39A shows a video frame, Figure 39B shows the status in the video buffer, Figure 39C shows the MPEG system stream, and Figure 39D shows audio data. An abscissa axis indicates the time base that is common to each drawing, and each drawing is represented on the same time basis. As shown in Figure 39B, in addition, an ordinate axis indicates the use of a buffer (the amount of data storage of the video buffer), and a thick line in the drawing indicates the transition of the use of intermediate memory on a time basis. In addition, the thick line gradient is equivalent to the bit rate of the video, and indicates that the data is entered into the buffer at a constant rate. A reduction in the use of buffer in a constant interval indicates that the data is decoded. In addition, the intersection of an oblique dotted line and the time base indicates a time when data transfer from the video frame to the video buffer has begun.

Hereinafter, as an example, a complex image A will be described in the video data. Because an image A requires a large amount of coding as shown in Figure 39b, the data transfer to the video buffer must start at a time ti in the drawing instead of the decoding time of image A. (Reference will be made to a time from the start time of data entry ti to the decoding as vbv_delay (delay)). As a result, the AV data is multiplexed at the position (time) of the video set shown in an oblique line. On the other hand, the transfer of audio data that does not require control of dynamic encoding amount as opposed to video data, need not be done particularly before the decoding time. For this reason, in general, multiplexing is carried out a le before the decoding time. Accordingly, the video data and the audio data that is reproduced at the same time are multiplexed in the state in which the video data is preceded. In the MPEG, the time in which the data can be stored in the buffer memory is restricted, and all the data, with the exception of data of still images, are defined in such a way that they must leave the buffer towards the decoder within a second after being entered into the buffer. For this reason, a displacement of the multiplexing of the video data and the audio data is a maximum of one second (strictly speaking, there is an additional displacement due to the rearrangement of the video data). While the video has been followed by the audio in this example, the audio can also be followed by the video with respect to the theory. When a simple image with a high compression ratio is prepared for the video data and the audio data is transferred unnecessarily fast, such data can be created intentionally. However, the precedence can be given within a maximum of one second based on MPEG restrictions. (Description of Tape Media). Next, the tape means will be described. Figure 40 is a diagram illustrating a tape that has been widely used in a conventional manner for AV recording. Speaking briefly, the recording band of each data is assigned horizontally to a tape with respect to one direction of operation thereof, and the tape is constituted by a video recording band, an audio recording band, and a band. of time code recording. In the time code recording band a recording date corresponding to each video frame recorded in the image recording band is recorded. By displaying the time code information together with the corresponding image information, a user can know how long an image that is being viewed was recorded. The present invention solves the following problems that obstruct the expected performance of the DVD-RAM as AV recording medium in the next generation described in the prior art, to maximize it, and implements a DVD recorder, which is the favorite and largest use. of a large capacity recordable DVD-RAM optical disc. The maximum characteristic of a DVD recorder is the random access performance in which high-speed access can be given to a desired location by a user, which can not be implemented by conventional tape media. A menu is used to effectively delineate the random access performance. Figure 41 shows an example of a menu display on the DVD recorder. The DVD recorder displays a list of program information recorded on the DVD-RAM. When the user selects a program in the menu, the DVD recorder searches for AV data for the selected program and starts playing it. The recording date and time information shown in Figure 41 is essential information for the menu. For example, in a disk that stores a series of dram, the user can see programs in the order of the recording of images with reference to a date and time of recording. A one-time search takes several hundred milliseconds in a random access operation. The speed of the random access is not enough to repeat the search to collect the recording date and time information of each program to display it in the menu. For example, in the case where there are 100 programs recorded on the DVD-RAM, it takes a time of 500 milliseconds for the search of each program, a time of 50 seconds (= 100 x 500 milliseconds) is required to collect the information from date and time of recording about all the programs. More specifically, after the user inserts the DVD-RAM into the DVD recorder, and waits 50 seconds, a menu screen is displayed for the first time. Therefore, it is difficult to say that the random access function which is the largest feature of the DVD recorder can be used effectively. EXPOSITION OF THE INVENTION In order to solve the above problems, this invention provides a suitable information recording medium for an optical disc such as the DVD, which updates the high-speed reading operation of recording date and time information for stored AV data. . The invention also provides an apparatus and method for recording or reproducing data in the recording medium.

In a first aspect of the invention, a recording medium is provided. The recording medium comprises video data and administration information including recording time information indicative of the date and time at which the video data was recorded. In the recording medium, the recording time information may comprise main time information including information of the date and time of recording of the video data represented by year, month, day, hour, minute and second, and information of error time including fraction of time of the date and time of recording of video data that are less than one second. In a second aspect of the invention, an apparatus for recording data in the recording medium is provided. The apparatus comprises a receiving unit for receiving a request to erase a part of the user's video data; and an update unit for updating the recording time information when the video data part is deleted according to the received request. In a third aspect of the invention, an apparatus for reproducing data from the recording medium is provided. The apparatus comprises a computing unit for calculating a recording time to be displayed by adding the elapsed time spent from a header of the video data to the recording time information of the video data during the data reproduction operation and a synthesizer unit to synthesize the calculated recording date and time information and the video data. In a fourth aspect of the invention, a method for recording data in a recording medium is provided. The method comprises receiving a request to delete a part of the user's video data; and updating the recording time information when the video data part is deleted according to the received request. In a fifth aspect of the invention, a method for reproducing data from the recording medium. The method comprises calculating a recording time to be displayed by adding the elapsed time spent from a header of the video data to the recording time information of the video data during the data reproduction operation and synthesizing the date and time information. calculated recording time and video data. (Related Reference) It should be noted that this application is based on application No. 11-061296 filed in Japan, the content of which is incorporated herein by reference. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a diagram showing the logical structure of a disk in the second mode.

Figure 2 is a diagram showing a structure in an AV file for a moving image or movie data. Figure 3 is a diagram showing a structure in an AV file for a still image. Figure 4 is a diagram showing the relationship between AV data and administration information. Figure 5 is a diagram showing the structure of RTR_VMG. Figure 6 is a diagram showing the structure of RTR_VMGI. Figure 7 is a diagram illustrating the VERN and TM_ZONE formats. Figure 8 is a diagram showing the structure of PL_SRP. Figure 9 is a diagram illustrating the PL_TY and PL_CREATE formats. Figure 10 is a diagram illustrating a PTM recording format. Figure 11 is a diagram illustrating a recording format S_VOB_ENTN. Figure 12 is a diagram showing the structure of M_AVFIT. Figure 13 is a diagram illustrating the formats V_ATR and A_ATR.

Figure 14 is a diagram illustrating the SP_ATR and SP_PLT formats for a moving image. Figure 15 is a diagram showing the structure of M_AVFI. Figure 16 is a diagram showing the structure of M_VOBI. Figure 17 is a diagram illustrating a VOB_TY format. Figure 18 is a diagram showing the structure of TMAPI. The figure 19 is a diagram illustrating a VOBU_ENT format. Figure 20 is a diagram showing the structure of S_AVFIT. Figure 21 is a diagram illustrating the formats V_ATR and OA_ATR. Figure 22 is a diagram illustrating the SP_ATR and SP_PLT formats for a still image. Figure 23 is a diagram showing the structure of S_AVFI. Figure 24 is a diagram showing the structure of S_VOB_ENT. Figure 25 is a diagram illustrating an S_VOB_ENT_TY format. Figure 26 is a diagram showing the structure of UD_PGCIT. Figure 27 is a diagram showing the structure of TXTDT_MG. Figure 28 is a diagram showing the structure of PGCI. Figure 29 is a diagram illustrating a PG_TY format. Figure 30 is a diagram showing the structure of Cl. Figure 31 is a diagram that illustrates a format C_TY Figure 32 is a diagram showing the structure of C_EPI. Figure 33 is a diagram illustrating an EP_TY1 format. Figure 34 is a block diagram showing the disk drive device of a DVD burner. Figure 35A is a diagram showing an address space on a disk. Figure 35B is a graph showing the amount of data storage in a track buffer. Figure 36 is an image correlation diagram in an MPEG video stream. Figure 37 is a diagram showing the structure of an MPEG system stream. Figure 38 is a diagram showing the structure of a decoder (P-STD) of the MPEG system. Figure 39A is a diagram showing video data. Figure 39B is a graph showing the use of the video buffer. Figure 39C is a diagram showing the current of the MPEG system. Figure 39D is a diagram showing audio data. Figure 40 is a diagram showing the structure of a recording band on a tape. Figure 41 is a diagram illustrating a method for generating a menu from current data. Figure 42 is a diagram illustrating a method for generating a menu based on management information. Figure 43 is a diagram illustrating a method for generating recording date information during playback. Figure 44 is a diagram showing the structure of the DVD burner. Figure 45 is a diagram illustrating a method for modifying recording date information during editing. Figure 46 is a partial erasure operation flow diagram. Figure 47 is an operation flow diagram of erasing the back of the VOB in the partial erasure operation. Figure 48 is an operation flow diagram of erasing the front of VOB in the partial erasure operation. Figure 49A is a diagram illustrating the partial erasure of the portion that includes a VOB header. Figure 49B is a diagram illustrating the partial erasure of the middle portion of VOB. Figure 49C is a diagram illustrating the partial erasure of the portion that includes the VOB tail. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail using a DVD burner and a DVD-RAM according to one embodiment of the present invention. (Logical Structure of the DVD-RAM) First of all, the logical structure of the DVD-RAM with reference to Figure 1. Figure 1 shows a physical sector address on a disk and a data structure on the disk which can be seen through a file system.

In the portion of the head of the address of the physical sector an input groove region is provided in which a reference signal necessary to stabilize a servomechanism, an identification signal with other means and the like is recorded. A data region is connected to the input groove region. Logically available data is recorded in this portion. Finally, an output groove region is provided, which has the same reference signal as the input groove region or the like. the administration information for a file system referred to as volume information is recorded at the head of the data region. Since the filing system is not directly related to the contents of the present application, it will be omitted. It is possible to deal with data on the disk as a directory or file, as shown in Figure 1 through the file system. All the data that will be processed by the DVD recorder is placed in a DVD_RTR directory immediately below a ROOT directory as shown in Figure 1. The file that will be treated by the DVD recorder is divided into 2 classes in general. of files, that is, an administration information file and one or more AV files. The AV file records a RTR_MOV.VRO 103 file to record a moving image or movie and a RTR_ST0.VR0 105 file to record a still image and audio data that is recorded along with the still image. Figure 2 is a diagram showing the structure of the RTR_M0V.VR0 103 file that stores the moving image. As shown in Figure 2, M_VOB (Movie Video Object) is provided which is the MPEG program stream in the RTR_MOV.VRO 103 file in the order of recording. The M_VOB comprises VOBUs (Units of Objects of Video), each of which is a unit of 0.4 to 1.0 seconds based on a video playback time. The VOBU comprises V_PCK (Video Set), A_PCK (Audio Set) and SP_PCK (Sub-Image Set). Each set is constituted in a unit of 2 kB. In addition, the video data in the VOBU comprises at least one GOP (Group of Images). The GOP is an MPEG video decoding unit and is constituted by a plurality of P and B images when using the I image as the head. Figure 3 is a diagram showing the structure of the RTR_STO.VRO 105 file in which a still image and audio data are recorded. As shown in Figure 3, S_V0B (Fixed Image Video Object) which is a stream of the MPEG program for the still image is provided in the RTR_STO.VRO 105 file in the order of image recording. A big difference between the M_VOB and the S_VOB is that in the S_VOB the moving image data and the audio data are not mutually multiplexed; but the audio data (part of Audio) is recorded successively after the still image data (part of Video), in addition to the recording of the still image data instead of the moving image data. In addition, the S_VOB is constituted by a VOBU, and the VOBU is constituted by the V_PCK, the A_PCK and the SP_PCK. (AV Data and Administration Information) Next, a description of the relationship between the M_VOB and the S_VOB described above will be given, and the administration information with reference to Figure 4. As described above, the AV data has two kinds of information. data, that is, the M_VOB for a movie image and the S_VOB for a still image. Each M_VOB has management information M_V0B1, and the attribute information of the corresponding M_V0B is recorded in M_V0B1. In the case of the S_VOB, if the administration is carried out for each S_VOB, the amount of administration information is increased. Therefore, there is S_VOGI administration information for each group S_V0G which is a set of S_VOBs. The S_VOGI records the attribute information of a corresponding S_VOB group. It is important that there is no linearity between the time and the amount of data in the MPEG data stream. As described above, a compression method is performed using a time and compression correlation feature using a variable length coding method referred to as VBR in order to implement a highly efficient MPEG stream compression. . Accordingly, the time and amount of data or address information does not uniquely correspond to each other. The M-VOBI has a filter (TMAP) to convert a time and an address, and the S_VOGI has a filter (Inputs S_VOB) to convert a fixed image number and an address in a group. Next, a description for the administration information of a playback sequence will be given. The reproduction sequence is defined as a sequence (PGC) of a cell indicative of a partial or total range of the M_VOB and the S_VOG. The playback sequence has two kinds of parts, that is, an original PGC that refers to all the AV data on the disk and a user-defined PGC that selects a user's preference of the AV data on the disk and defines it. an order of reproduction (several definitions can be obtained). Reference is also made to the original PGC as a set of programs (Program Set), and includes a layer referred to as a program (Program) having a plurality of cells logically packed between them. The user-defined PGC is also referred to as a playlist (Play List) and does not include Program in between, unlike the original PGC. (Administration Information File) The contents of the "RTR.IFO" administration information file will be described below with reference to Figures 5 to 33. "RTR_VMG" (Figure 5): The administration information that is made Reference as RTR_VMG (Real Time Recording Video Management) is recorded in the RTR.IFO 101 file. The RTR_VMG comprises seven RTR_VMGI tables, M_AVFIT, S_AVFIT, ORG_PGCI, UD_PGCIT, TXTDT_MG and MNFIT. Each table will be described in detail below: "RTR_VMGI" (Figure 6): The RTR_VMGI (Real Time Recording Video Management Information) comprises VMGI_MAT and PL_SRPT..

"VMGI_MAT" (Figure 6): The VMGI_MT (Video Management Information Management Table) stores the following information as information related to the entire disk. A player and a recorder can read the VMGI_MAT first to obtain approximately structural information of the disk. VMG_ID (Video Management Identifier): The VMG_ID stores an identifier "DVD_RTR_VMGO" which indicates that the video recording data is recorded on this disk. RTR_VMG_EA (End Address RTR_VMG): The final address of the RTR_VMG is recorded here. VMGI_EA (Final Address VMGI): The final address of the VMGI is recorded here. VERN (Version Number): The version number of a recording format of the video recording data is recorded according to the format shown in Figure 7. TM_ZONE (Time Zone): A time zone is recorded here for use of all date and time information recorded on this disc. As shown in Figure 7, TM_ZONE comprises TZ_TY (type of time zone) and TZ_0FFSET (time zone offset). TZ_TY indicates that Greenwich mean time is used as universal time and as standard time for each region for date information reference.

TZ_OFFSET records a time difference between the date and the Greenwich mean time. STILL_TM (Fixed Time): A static length of time obtained when displaying a still image without sound is recorded. CHRS Character Set Code for Text Primary): A character set code for a primary text is recorded here, which will be described later. M_AVFIT_SA (M_AVFIT Start Address): Here is the start address of M_AVFIT. When M_AVFIT is accessed, a search is made to this start address. S_AVFIT_SA (S_AVFIT Start Address): Here is the start address of S_AVFIT. When accessing S_AVFIT, a search is made to this start address. ORG_PGCI_SA (Start Address of 0RG_PGCI): Here is the start address of ORG_PGCI When accessing ORG_PGCI, a search is made to this start address. UD PGCIT SA (Start address of UD PGCIT SA): Here is the start address of UD_PGCIT. When accessing UD_PGCIT, a search is made to this start address. TXTDT_MG_SA (TXTDT_MG_SA Start Address): Here is the start address of the TXTDT_MG When TXTDT_MG is accessed, a search is made to this start address. MNFIT_SA (MNFIT_SA Start Address): The MNFIT start address is recorded here. When MNFIT is accessed, a search is made to this start address. "PL_SRPT" (Figure 8): PL_SRPT (Play List Search Indicator Table) is a table comprising PL_SRPTI and PL_SRPs. "PL_SRPTI" (Figure 8): PL_SRPTI (Playlist Search Indicator Table Information) stores the following information to access PL_SRP. PL_SRP_Ns (PL_SRP number): The number of PL_SRPs is recorded here. PL_SRPT_EA (Final Address of PL_SRPT): The final address of PL_SRPT is recorded here. "PL_SRP" (Figure 8): In addition, the following information to give access to the user defined PGC which are current data of the playlist, is recorded in PL_SRP (Play List Search Indicator): PL_TY (Type of Playlist): Any of the following values is recorded as a value to identify the type of a playlist according to the description format shown in Figure 9. 0000b: Moving images only. 0001b: Only still images. 0010b: Hybrid of moving images and still images PGCN (PGC number): The corresponding PGC number is recorded here to the playlist. The PGC number indicates the recording order of the PGC information in UD_PGCIT which will be described later. PL_CREATE_TM (Play List Recording Time): Here the information about the date and time the playlist was created is recorded according to the description format shown in Figure 9. PRM_TXTI (Primary Text Information) ): Text information indicative of the contents of the playlist is recorded here.

For example, in the case where a television program is recorded in images, the name of the program is recorded. In addition, the primary text information is constituted by a field for the ASCII code and a field for a specified set of character codes by the aforementioned CHRS. IT_TXT_SRPN (IT_TXT_SRP Number): When information indicative of the contents of the playlist is optionally recorded as IT_TXT in addition to the primary text mentioned above, the IT_TXT_SRP number is recorded as link information for the IT_TXT to be recorded in the TXTDT_MG. The number IT_TXT_SRP indicates the order of recording in TXTDT_MG that will be described later. THM_PTRI (Condensed Indicator Information): The condensed information that is representative of the playlist is described. "THM_PTRI" (Figure 8): In THM_PTRI the following information indicative of the position of a condensate is recorded. CN (Cell number): Here is recorded the cell number that includes a condensate. The cell number indicates the order of recording the cell information in the UD_PGCI to which the playlist corresponds.

THM_PT (Condensate Point): When a cell indicated by the aforementioned CN is in a film cell, the display time of a video frame to be used as a condensate is recorded according to the PTM description format shown in the Figure 10. The PTM is given according to the reference time of a timestamp described in the MPEG program stream. Further, when the cell indicated by the aforementioned CN is a still image cell, the fixed image VOB input number of a still image to be used as the condensate is recorded according to a description format S_VOB_ENTN shown in the Figure 11. The fixed-image VOB input number indicates the recording order of the fixed-image VOB input in a fixed-image VOB group indicated by this cell. "M_AVFIT" (Figure 12): The M_AVFIT (AV File Information Table of Moving Image) stores management information corresponding to the moving image AV file "RTR_MOV.VRO" and comprises M_AVFITI, M_VOB_STI and M_AVFI. "M_AVFITI" (Figure 12): The M_AVFITI (Information Table Information AV File of Moving Image) stores the following information necessary to give access to M_VOB_STI and M_AVFI.

M_AVFI_Ns (Number of AV File Information of Moving Image): Here the number of successive AVFI information fields is indicated. When the value is "0", there is no AVFI, while when the value is "1", AVFI exists. In addition, the presence of the AVFI also corresponds to that of the RTR_MOV.VRO which is the AV file for moving images. M_VOB_STI_Ns (Number of M_VOB_STI): Here the number of successive M_VOB_STI fields is indicated. M_AVFIT_EA (Final address M_AVFIT): The final address of M_AVFIT is recorded here. "M_VOB_STI" (Figure 12): The M_VOB_STI (Current Information VOB of Movie) stores the following information as the current information of the film VOB. V_ATR (Video Attribute): The following video attribute information is recorded according to a format shown in Figure 13. Video compression mode: Any of the following values are recorded here to identify a video compression mode . 00b: MPEG-1 01b: MPEG-2 TV System: Here are recorded any of the following values to identify a television system. 00b: 525/60 (NTSC) 01b: 625/50 (PAL) Aspect ratio: Here, any of the following values are recorded to identify a resolution ratio. 00b: 4 x 3 01b: 16 x 9 line21_switch_l: Here are recorded any of the following values to identify whether or not closed capture data (subtitles) were recorded for a field 1 in a video stream. lb: Recorded 0b: Not recorded line21_switch_2: Here are recorded any of the following values to identify whether or not closed capture data (subtitles) was recorded for a field 2 in the video stream. lb: Recorded Ob: Not recorded Video resolution: Any of the following values are recorded here to identify a video resolution. 000b: 720 x 480 (NTSC), 720 x 576 (PAL) 001b: 702 x 480 (NTSC), 702 x 576 (PAL) 010b: 352 X 480 (NTSC), 352 x 576 (PAL) 011b: 352 x 240 (NTSC), 352 x 288 (NTSC) PAL) 100b: 544 x 480 (NTSC), 544 x 576 (PAL) 101b: 480 X 480 (NTSC), 480 X 576 (PAL) AST_Ns (Number of Audio Currents): Here is recorded the number of streams of audio recorded in the corresponding VOB. SPST_Ns (Number of Sub-Picture Currents): The number of sub-picture currents recorded in the corresponding VOB is recorded here. A_ATR0 (Audio Current Attribute 0): The following audio attribute information corresponding to an audio stream 0 (corresponding to the audio stream # 1 described above) is recorded according to a format shown in Figure 13. Mode Audio coding: Any of the following values are recorded to identify an audio compression method. 000b: Dolby AC-3 001b: MPEG audio that has no extended current 010b: MPEG Audio that has extended current 011b: Linear PCM Application Signaler: Here are recorded any of the following values to identify the information of the application. 00b: Without application 01b: Mixed audio channel number 10b: With auxiliary voice Quantize / DRC: When MPEG audio is used, any of the following values are recorded here to identify the presence of DRC information (Dynamic Range Control) ). 00b: DRC data is not included in the MPEG stream. 01b: DRC data is included in the MPEG stream. When using LPCM audio, the following value is recorded here to identify the Quantization. 00b: 16 bits fs: Here the following value is recorded to identify a sampling frequency 00b: 48 kHz Number of Audio Channels: Here are recorded any of the following values to identify the number of audio channels. 0000b: one channel (monaural) 0001b: two channels (stereo) 0010b: three channels 0011b: four channels 0100b: five channels 0101b: six channels 0110b: seven channels 0111b: eight channels 1001b: two channels (dual monophonic) Transfer speed bits: Here are recorded any of the following values to identify the bit rate of 0000 0001b 64 kbps 0000 0010b 89 kbps 0000 0011b 96 kbps 0000 0100b 112 kbps 0000 0101b 128 kbps 0000 0110b 160 kbps 0000 0111b 192 kbps 0000 1000b 224 kbps 0000 1001b: 256 kbps 0000 1010b: 320 kbps 0000 1011b: 384 kbps 0000 1100b: 448 kbps 0000 1101b: 768 kbps 0000 1110b: 1536 kbps It is important that only the bit rate of a basic current excluding a current is recorded extended, when the corresponding audio stream is the MPEG audio stream that has the current extended. The reason is that the extended current can not be expressed by the aforementioned fixed bit rate because it carries out the compression using the variable length coding method. A_ATR1 (Audio Stream Attribute 1): The following audio attribute information, corresponding to an audio stream 1 (corresponding to the audio stream # 2 provided for later recording described above) is recorded according to a format shown in Figure 13. The individual fields are the same as the A_ATR0 mentioned above. SP_ATR (Sub-Image Attribute): The following sub-image attribute information is recorded according to a format as shown in Figure 14.

Application Signaler: Here are recorded any of the following values to identify the application information. 00b: Without application 01b: Subtitles 10b: Animation SP_PLT (Sub-image Color Palette): The color palette information for a sub-image is recorded according to the format shown in Figure 14. "M_AVFI" (Figure 15 ): M_AVFI (AV File Information of Moving Image) comprises information necessary to give access to the movie VOB (M_VOB, M_AVFI_GI, M_VOBI_SRP and M_VOBI. "M_AVFI_GI" (Figure 15): The M_VOBI_SRP_Ns is recorded in the M_AVFI_GI (General Information of AV File Information of Moving Image.) M_VOBI_SRP_Ns (Search Indicator Number of VOB Movie Information): The number of M_VOBI_SRP is recorded here. "M_VOBI_SRP" (Figure 15): The M_VOBI_SRP (Movie VOB Information Search Indicator) stores address information to access each M_VOBI. M_VOBI_SA (Movie VOB Information Start Address): The start address of M_VOBI is recorded here. The address indicated here can be used in search operation to access the VOB information. "M_VOBI" (Figure 16): The M_VOBI (Movie VOB Information) comprises movie VOB management information, M_VOB_GI, SMLI, AGAPI, TMAPI, and CP_MNGI. "M_VOBI_GI" (Figure 16): The M_VOB_GI (General Movie VOB Information) stores the following information as general information of Movie VOB. VOB_TY (VOB type): VOB attributes information is recorded here according to the format shown in Figure 17. TE: Here are recorded any of the following values to identify the status of the VOB. 0b: Normal status lb: Status of temporary deletion A0_STATUS: Here are recorded any of the following values to identify the status of the audio stream 0. 00b: Original status 01b: Re-recorded status A1_STATUS: Any of the following are recorded here values to identify the status of the audio stream 1. 00b: Original status 01b: Re-recorded status 10b: Model status for subsequent recording llb: Later recorded status APS: Here are recorded any of the following values to identify the control information of analog copy prevention signal. 00b: Without APS 01b: Type 1 10b: Type 2 llb: Type 3 SML_FLG: It is any of the following values to identify whether or not the VOB is played along with the VOB present just before, or not. 0b: Uniform reproduction is impossible. lb: Uniform reproduction is possible. A0_GAP_LOC: Here are recorded any of the following values indicative of the presence of an audio reproduction space in the audio stream 0 and VOBU having a multiplexed audio reproduction space range. 00b: Without audio playback space 01b: The audio playback spaces are multiplexed to a VOBU head. 10b: The audio reproduction spaces are multiplexed to a second VOBU. llb: The audio reproduction spaces are multiplexed to a third VOBU. Al_GAP_LOC: Here are recorded any of the following values indicative of the presence of an audio reproduction space in audio stream 1 and VOBU having a multiplexed audio reproduction space range. 00b: Without audio playback space 01b: The audio playback spaces are multiplexed to a VOBU head. 10b: The audio reproduction spaces are multiplexed to a second VOBU. llb: The audio reproduction spaces are multiplexed to a third VOBU. VOB_REC_TM (VOB Recording Time): Here is recorded the time and date on which the VOB was recorded in the same format as the PL_CREATE_TM shown in Figure 9 It is important that the recording time indicate the recording date and time of the video display box of the VOB head and the VOB_REC_TM 111 must also be corrected when the video frame of the VOB head is changed by editing or partial deletion. When a recording time is to be displayed in synchrony with the VOB playback, as commonly observed in a camera-recorder, the recording time to be displayed can be obtained by adding a time elapsed in the VOB to VOB_REC_TM 111. VOB_REC_TM_SUB (Error Information VOB Recording Time): The VOB_REC_TM_SUB 113 is a field to absorb the V0B_REC_TM 111 error that will be modified when the VOB head video frame is changed by editing and partial deletion in the VOB. The VOB_REC_TM 113 has information only about the year, month, day, hour, minute and second, as shown in Figure 9. Therefore, in the case where the editing or deletion is carried out in each frame or field , the VOB_REC_TM 111 can not provide enough precision. Consequently, the fraction or error generated by the editing or deletion is recorded in this field VOB_REC_TM_SUB 113. M_VOB_STIN (Number M_VOB_STI): Here the number M__VOB_STI corresponding to the VOB is recorded. The number M_VOB # STI shown here is the order of recording in the table M_VOB_STI mentioned. VOB_V_S_PTM (VOB Video Start PTM): Here the VOB deployment start time is recorded with the same reference time of the time stamp in a stream. VOB_V_E_PTM (VOB Video End PTM): Here is recorded the final deployment time of the VOB with the same reference time of the time stamp in a stream. It should be noted that the timestamp in the stream indicates the start time of display of the frame, while VOB_V_E_PTM stores the final deployment time, that is, a time obtained by adding the period of one frame to the start time of the frame. deployment. "SMLI" (Figure 16): The SMLI (Uniform Information) stores the following information necessary for uniform reproduction with the latest VOB. In addition, this field is provided only when "lb" is recorded in the aforementioned SML_FLG.

VOB_FIRST_SCR (VOB Head SCR): SCR is recorded in the first set of VOB. PREV_VOB_LAST_SCR (Last SCR of the Previous VOB): Here the SCR of the last previous VOB set is recorded. "AGAPI" (Figure 16): The AGAPI (Audio Space Information) stores the following information necessary to process an audio playback space in a decoder. In addition, this field is provided in the case when a value other than "00b" is recorded in any of the aforementioned A0_GAP_LOC or Al_GAP_LOC. VOB_A_STP_PTM (VOB Audio Stop PTM): The audio playback space time is recorded here, that is, the time the decoder temporarily stops audio playback, with the same reference time of the timestamp in a stream. VOB_A_GAP_LEN (VOB Audio Space Length): The length of time of an audio playback space is recorded with an accuracy of 90 kHz. "CP_MNGI" (Figure 16): The CP_MNGI (Copy Management Information) comprises copy management information for the VOB, CPG_STATUS and CPGI. CPG_STATUS (Copy Protection Status): As the copy protection status of the VOB, the values are recorded here to identify "copy-free" or "copy of a generation". CPGI (Copy Protection Information): The copy protection information applied to the VOB is recorded here. "TMAPI" (Figure 18): The TMAPI (Time Map Information) comprises TMAP_GI, TM_ENT and VOBU_ENT. "TMAP_GI" (Figure 18): The TMAP_GI (TMAP General Information) comprises TM_ENT_Ns, VOBU_ENT_Ns, TM_OFS and ADR_OFS. Each field is as follows. TM_ENT_Ns (TM_ENT number): The number of TM_ENT fields that will be described later is recorded here. VOBU_ENT_Ns (Number of VOBU_ENT): Here the number of fields of VOBU_ENT that will be described later. TM_OFS (Time Shift): Here is recorded the displacement value of a time map with a precision of a video field.

ADR_OFS (Address Shift): Here a shift value is recorded in the AV file of the VOB head. "TM_ENT" (Figure 18): The TM_ENT (Time Entry) comprises the following fields as access point information for each TMU constant interval. The TMU for NTSC is 600 video fields (NTSC), while the TMU for PAL is 500 video fields. VOBU_ENTN (VOBU_ENT number): Here is the VOBU entry number that includes a time indicated by TM_ENT (TMU x (N-1) + TM_OFS for N-th TM-ENT). TM_DIFF (Time Difference): Here a difference between the time indicated by the TM_ENT and the VOBU deployment start time indicated by the aforementioned VOBU_ENT is recorded. VOBU_ADR (VOBU address): Here is recorded a head address in the VOB of the VOBU indicated by the VOBU_ENTN mentioned above. "VOBU_ENT" (Figure 19): VOBU_ENT (VOBU Input) stores the following structure information of the corresponding VOBU in a format shown in Figure 19. By adding successive fields in order, it is possible to obtain time and address information necessary to access to the VOBU that is desired. ISTREF_SZ: Here is recorded the number of sets from a VOBU head set to a set that includes the latest data from the head I image in the VOBU. VOBU_PB_TM: The length of the VOBU's playing time is recorded here. V0BU_SZ: The amount of VOBU data is recorded here. "S_AVFIT" (Figure 20): S_AVFIT (Fixed Image AV File Information Table) here the administration information corresponding to the still image AV file "RTR_STO.VRO" is recorded, and comprises S_AVFITI, S_VOB_STI and S_AVFI. "S_AVFITI" (Figure 20): S_AVFITI (Information Table Information of AV File of Fixed Image) stores the following information necessary to access S_VOB_STI and S_AVFI. S_AVFI_Ns (Fixed Image AV File Information Number): Here "0" or "1" is recorded as the S-AVFI number. This value also corresponds to the fixed image AV file number, that is, the presence of the RTR_STO file. VRO S_VOB_STI_Ns (VOB Current Information Number of Fixed Image): Here the S_VOB_STI number that will be described later is recorded. S_AVFI_EA (Final Direction of AV File Information of Fixed Image): Here is the final address of S_AVFI. "S_VOB_STI" (Figure 20): In S_VOB_STI (Fixed Image VOB Current Information) the following information is recorded as current information of the still image VOB. V_ATR (Video Attri): Here the Video compression mode is recorded, TV system, aspect ratio and video resolution as information of video attris. The individual fields are the same as V_ATR in the aforementioned M_VO_STI. OA_ATR (Audio Stream Attri): Audio encoding mode, Signalizer Application, Quantization / DRC, fs, and Number of Audio channels are recorded as information of audio stream attris. The individual fields are the same as A_ATR0 in the aforementioned M_VOB_STI. SP_ATR (Sub Image Attri): Here the application flag is recorded as sub-image attri information. The field is the same as SP_ATR in the M_VOB_STI mentioned above. SP_PLT (Sub-image Color Palette): Here the color palette information for a sub-image is recorded. A recording format is the same as SP_PLT in the M_VOB_STI mentioned above. "S_AVFI" (Figure 23): S_AVFI (AV File Information of Fixed Image) includes information necessary to access VOG, S_AVFI_GI, S_VOGI_SRP and S_VOGI of still image. "S_AVFI_GI" (Figure 23): S_AVFI_GI (General Information Information AV File Fixed Image) stores S_VOGI_SRP_Ns. S_VOGI_SRP_Ns (Fixed Image VOB Group Search Indicator Number): The number of S_VOGI_SRP fields that will be described later is recorded here. "S_VOGI_SRP" (Figure 23): S_VOGI_SRP (Static VOB Group Information Search Indicator) stores S_VOGI_SA.

The start address of S_VOGI is recorded in the S_VOGI_SA (Fixed Image VOB Group Information Start Address). "S_VOGI" (Figure 23): The S_VOGI (Image Group VOB Information Fixed) comprises the administration information of VOB, S_VOGI_GI, S_VOB_ENT and CP_MNGI of still image. "S_VOG_GI" (Figure 23): The following information is recorded as the general information of a fixed image VOB group in S_VOG_GI (General Information of Fixed Image VOB Group). S_VOB_Ns (Number of Fixed Image VOBs): The number of still image VOBs in the fixed image VOB group is recorded here. S_VOB_STIN (Number S_VOB_STI): Here is recorded the S_VOB_STI number of S_VOB_STI that stores the current information of the still image VOB. The number S_VOB_STI is the order of recording in the table S_VOB_STI mentioned above. FIRST_VOB_REC_TM (First VOB Recording Time): The recording date and time information of the first still image (head) VOB in the still image VOB group is recorded here.

LAST_VOB_REC_TM (Last VOB Recording Time): The recording date and time information of the last still image VOB in the still image VOB group is recorded here. S_VOB_SA (Fixed Image VOB Group Start Address): Here is the start address of the fixed image VOB group in the RTR_STO.VRO file. "CP_MNGI": CP_MNGI (Copy Management Information) stores copy management information related to the fixed-image VOB group. The individual fields are the same as the CP_MNGI of the aforementioned M_VOBI. "S_VOB_ENT" (Figure 24): S_VOB_ENT (Fixed Image VOB Input) corresponds to the individual still image VOBs in the fixed image VOB group, and is divided into the following types A and B depending on the presence of data of audio "S_VOB_ENT (Type A)" (Figure 24): Type A comprises S_VOB_ENT_TY and V_PART_SZ. The individual fields are as follows. S_VOB_ENT_TY (Fixed Image VOB Input Type): The type information of the still image VOB is recorded here in a format shown in Figure 25. MAP_TY: Here are recorded any of the following values to identify type A or type B. 00b: Type A 01b: Type B TE: Here are recorded any of the following values to identify the status of the fixed image VOB. 0b: Normal status lb: Temporary erase status SPST_Ns: The number of sub-picture streams in the still image VOB is recorded here. V_PART_SZ (Video Part Size): The amount of fixed image VOB data is recorded here. "S_VOB_ENT (Type B)" (Figure 24): Type B has A_PART_SZ and A_PB_TM in addition to S_VOB_ENT_TY and V_PART_SZ. The individual fields are as follows. S_VOB_ENT_TY (Fixed Image VOB Input Type): VOB type information of fixed image is recorded here. The individual fields are the same as in Type A mentioned above. V_PART_SZ (Video Part Size): The amount of data of a video part in the still image VOB is recorded here. A_PART_SZ (Audio Part Size): The amount of data of an audio part in the still image VOB is recorded here. A_PB_TM (Audio Playback Time): The playback time length of the audio part of the still image VOB is recorded. "UD_PGCIT" (Figure 26): UD_PGCIT (PGC Information Table Defined by the User) comprises UD_PGCITI, UD_PGCI_SRP and UD_PGCI. "UD_PGCITI" (Figure 26). UD_PGCITI (Information Table Information PGC Defined by the User) stores the following information that constitutes the table of information PGC defined by the user. UD_PGCI_SRP_Ns (PGC Information Search Indicator Number Defined by the User); The number of UD_PGCI_SRP is recorded here. UD_PGCIT_EA (Final Address of the PGC Information Table Defined by the User): Here is the final address of UD_PGCIT. "UD_PGCI_SRP" (Figure 26): UD_PGCI_SA is recorded in UD_PGCI_SRP (PGC Information Search Indicator Defined by the User). UD_PGCI_SA (PGC Information Start Address Defined by the User): The start address of UD-PGCI is recorded in UD_PGCI_SA. A search is performed to a recorded address when accessing the PGCI. "UD_PGCI" (Figure 26): The details of the UD_PGCI (PGC Information Defined by the User) will be described in the following PGCI. "0_PGCI" (Figure 5): The details of the 0_PGCI (Original Information PGC) will be described in the following PGCI. "TXTDT_MG" (Figure 27): TXTDT_MG (Text Data Management) comprises TXTDTI, IT_TXT_SRP and IT_TXT. The individual fields are as follows. "TXTDTI" (Figure 27): TXTDTI (Text Data Information) comprises CHRS, IT_TXT_SRP_Ns and TXTDT_MG_EA. CHRS (Character Set Code): Here a character set code is found to be used by the IT_TXT. IT_TXT_SRP_Ns (Search Indicator Number IT_TXT): The IT_TXT_SRP number is recorded here. TXTDT_MG_EA (Final Address of Administration of Text Data): The final address of the TXTDT_MG is recorded here. "IT_TXT_SRP" (Figure 27): IT_TXT_SRP (Search Indicator IT_TXT) stores the following as access information to the corresponding IT_TXT. IT_TXT_SA (IT_TXT Start Address): The start address of the IT_TXT is recorded here. When IT_TXT is accessed, a search is made to this address. IT_TXT_SZ (IT_TXT size): The IT_TXT data size is recorded here. When the IT_TXT is going to be read, only data with this size is read. "IT_TXT" (Figure 27): The IT_TXT comprises a plurality of sets or a set, each set having IDCD (Code Identification), TXT (Text) corresponding to the IDCD and TMCD (Termination Code). When there is no TXT corresponding to the IDCD, the IDCD and the TMCD can make a set without TXT. The IDCD is defined as follows. Gender code: 30h: Movie 31h: Music 32h: Drama 33h: Animation 34h: Sports 35h: Documentary 36h: News 37h: Atmospheric State 38h: Education 39h: Hobbies 3Ah: Entertainment 3Bh: Art (performance, opera) 3Ch: Shopping Code Input Source: 60h: 61h transmission station: 62h Camacho: Photo 63h: 64h Memo: Other "PGCI" (Figure 28): PGCI (Information PGC) has a data structure that is common to 0_PGCI and UD__PGCI, and comprises PGC_GI, PGI, CI_SRP and Cl. "PGC_GI" (Figure 28): PGC_GI (PGC General Information) comprises PG_Ns and CI_SRP_Ns as PGC general information. The individual fields are as follows. PG_Ns (Number of Programs): The number of programs in the PGC is recorded here. For the PGC defined by the user, "0" is recorded in this field because the PGC defined by the user does not have programs. CI_SRP_Ns (CI_SRP number): The CI_SRP number that will be described later is recorded. "PGI" (Figure 28): PGI (Program Information) comprises PG_TY, C_Ns, PRM_TXTI, IT_TXT_SRPN and THM_PTRI. The individual fields are as follows. PG_TY (Program Type): Here is recorded the following information indicative of the status of this program using a program shown in Figure 29. Protect (protect): 0b: Normal status lb: Protection status C Ns (Number of Cells) : The number of cells in this program is described. PRM_TXTI (Primary Text Information): Text information indicative of the contents of this program is recorded here. The details are the same as in the aforementioned PL_SRPT. IT_TXT_SRPN (IT_TXT_SRP number): In the case where information indicative of the contents of this program is optionally recorded as the IT_TXT in addition to the primary text mentioned above, the IT_TXT_SRP number recorded in the TXTDT_MG is recorded in this field. THM_PTRI (Condensed Indicator Information): Here the condensed information that is representative of this program is described. The details of THM_PTRI are the same as in the THM_PTRI of the aforementioned PL_SRPT. "CI_SRP" (Figure 28): CI_SRP (Cell Information Search Indicator) stores address information to access the cell information. CI_SA (Cell Information Start Address): Here the address of the cell information start is recorded. In the case in which the cell is accessed, a search is carried out to this address.

"Cl" (Figure 30): Cl (Cell Information) is classified in MI_CI for a moving image and S_CI for a still image. "M_CI" (Figure 30): M_CI (Information of Moving Image Cell) comprises M_C_GI and M_C_EPI. "M_C_GI" (Figure 30): M_C_GI (General Information of Moving Image Cell) has the following basic information that constitutes a cell. C_TY (Cell Type): The following information to identify a moving image cell and a still image cell are recorded in a format shown in Figure 31. C_TY1: 000b: Moving Image Cell (Movie) 001b: Cell Fixed Image M_VOBI_SRPN (Movie VOB Information Search Indicator Number): Recorded the VOB movie information search indicator number to which this cell corresponds. In the case in which access is given to a data stream to which this cell corresponds, first access is given to a search indicator number of movie VOB information indicated by this field.

C_EPI_Ns (Cell Entry Point Information Number): The point entry number present in this cell is recorded here. C_V_S_PTM (Cell Video Start Time): The playback start time of this cell is recorded in a format shown in Figure 10. C_V_E_PTM (Cell Video End Time): The final reproduction time of this cell is record in the format shown in Figure 10. The effective range of this cell in the VOB to which this cell corresponds is specified using the C_V_S_PTM and C_V_E_PTM. "M_C_EPI" (Figure 32): M_C_EPI (Moving Image Cell Entry Point Information) is classified into a type A and a type B depending on the presence of a primary text. "M_C_EPI (Type A)" (Figure 32): M_C_EPI (Type A) comprises the following information indicative of an entry point. EP_TY (Type of Entry Point): The following information to identify the type of this entry point is recorded according to a format shown in Figure 33. EP_TY1: 00b: Type A 01b: Type B EP_PTM (Point Time of Input): A time is recorded in which an entry time is set according to the format shown in Figure 10. "M_C_EPI (Type B)" (Figure 32): M_C_EPI (Type B) has the following PRM_TXTI in addition to the EP_TY and EP_PTM included in type A. PRM_TXTI (Primary Text Information): Here is recorded text information indicative of the contents of the locations indicated by this entry point. The details are the same as in the aforementioned PL_SRPT. "S_CI" (Figure 30): S-CI (Fixed Image Cell Information) comprises S_C_GI and S_C_EPI. "S_C_GI" (Figure 30): S_C_GI (General Information of Fixed Image Cell) has the following basic information that constitutes a cell. C_TY (Cell Type): Information is recorded to identify a moving image cell and a still image cell. The details are the same as in the aforementioned moving image cell. S_VOGI_SRPN (Fixed Image VOB Group Information Search Indicator Number): Recorded here is the fixed image VOB group information search indicator number to which this cell corresponds. In the case where access is given to the data stream to which this cell corresponds, access is first given to a search indicator number of fixed image VOB group information indicated by this field. C_EPI_Ns (Cell Entry Point Information Number): The number of entry points present in this cell is recorded. S_S_VOB_ENTN (Start Fixed Image VOB Number): The playback start still image VOB number of this cell is recorded in the format shown in Figure 11. The still image VOB number is the order in the S_V0G indicated by the S_VOGI_SRPN mentioned above. E_S_VOB_ENTN (VOB number of Final Fixed Image): The final playback image VOB number of this cell is recorded in the format shown in Figure 11. The still image VOB number is the order in the S_VOG indicated by the aforementioned S_VOGI_SRPN. The effective range of this cell in the S_VOG to which the cell corresponds is specified when using the S_S_VOB_ENTN and E_S_VOB_ENT. "S_C_EPI" (FIGURE 32): S_C_EPI (Fixed Image Cell Entry Point Information) is classified into type A and type B depending on the presence of a primary text. "S_C_EPI (Type A)" (Figure 32): S_C_EPI (Type A) comprises the following information indicative of an entry point. EP_TY (Type of Entry Point): The following information to identify the type of this entry point is recorded according to the format shown in Figure 33. EP_TY1: 00b: Type A 01b: Type B S_VOB_ENTN (Entry Number of Fixed Image VOB): Here a fixed image number is recorded in which the entry point is set according to the format shown in Figure 11. "S_C_EPI (Type B)" (Figure 32): S_C_EPI (Type B) has the following PRM_TXTI in addition to the EP_TY and S_VOB_ENTN included in S_C_EPI of type A. PRM_TXTI (Primary Text Information): Here is recorded text information indicative of the contents of locations indicated by this entry point. The details are the same as in the aforementioned PL_SRPT. (Record Date and Time Information). Next, a description will be given for a method for calculating recording date and time in a menu screen and a playback display screen from the aforementioned data structure. As described above, the recording date and time are recorded as V0B_REC_TM (VOB recording time information) in the M_VOB_GI (General Movie VOB Information). This time indicates the date and time when the head frame (in the order of display) of the corresponding VOB was recorded. More specifically, the recording date and time for each frame in the VOB can be obtained by adding the time elapsed in the VOB to this value. Figure 42 shows an example of the recording date and time information displayed on the menu screen. As described above, in the DVD-RAM, a program and a playlist are set as a logical reproduction sequence of which the user is aware of physically recorded AV data. More specifically, the DVD recorder does not display a program list based on the VOB on the menu screen. But the recorder displays the program list based on the program and the playlist, and the recording date information. The recording time information is handled for each VOB. Therefore, the DVD recorder needs to know a time elapsed in the VOB and add the elapsed time to the VOB_REC_TM in order to obtain the recording time information in the head of each program and each playlist. The time spent in the VOB of the program's head frame and the playlist can be obtained by using the following equation. elapsed time = C_V_S_PTM-VOB_V_S_PTM (1) where C_V_S_PTM represents the program start time information of the program or Head cell of the play list. By adding the elapsed time obtained by equation (1) to VOB_REC_TM which is the recording time information of the VOB corresponding to the Cell, the recording time information of the program or playlist can be obtained. Next, an example of the recording time information displayed on the playback display screen will be described with reference to Figure 43. To obtain the recording time information displayed on the screen during the reproduction operation, it is necessary to take Consideration of another time elapsed in the reproduction. As described above, since the time elapsed from the VOB head to the cell head can be obtained by equation (1), an elapsed time (Telapse) can be counted from the cell head during playback. (Structure of the DVD Recorder) Next, the structure of the DVD recorder will be described with reference to Figure 44. In the drawing, the DVD recorder comprises a user interface 7801, a system controller 7802, an input section 7803, a 7804 encoder, an output section 7805, a decoder 7806, a track buffer 7807 and a disk drive 7808. The user interface 7801 accepts a screen for the user and the user's request. The 7802 system controller has a clock and serves to fully carry out the administration and control. Input section 7803 includes an AD converter to receive audio and video signal. The output section 7805 produces audio and video data. The decoder 7806 decodes an MPEG stream. (DVD Recorder Recording Operation) The recording operation of the DVD recorder will be described below. Upon receiving a request for the user's program recording through the user interface 7801, the system controller 7802 notifies the encoder 7804 about an encoding initiation request. The encoder 7804 performs video and audio coding by encoding the audio and video signal sent from the input section 7803, and multiplexes AV data and provides the data as the MPEG system current (VOB) shown in Figure 37 to the track buffer 7807. At the same time, the system controller 7802 sends a write request to the disk drive 7808 for the DVD-RAM. The disk drive 7808 collects the data stored in the track buffer 7807 and records the same data in the DVD-RAM. further, the system controller 7802 collects the date and time information from an internal clock and temporarily stores the date and time information in the internal memory simultaneously with the start of image recording. When the user requests to stop the recording or a final recording time arrives, the system controller 7802 receives a request to stop the recording through the user interface 7801. The system controller 7802 notifies the encoder 7804 about the request for detention of - recording. The encoder 7804 stops a coding process. In addition, the encoder section 7804 returns set number information including the size of each VOBU, a reproduction interval and the head I image of the system controller 7802 at the same time as the end of the encoding process. The system controller 7802 generates a time map based on the VOBU information received from the encoder 7804. Then the system controller 7802 notifies the disk unit 7808 about the recording stop request. The disk drive 7808 ends the recording process when the operation is finished for the recording data remaining in the track buffer 7807 for the DVD-RAM, and notifies the 7802 system controller of the termination. When the process of the encoder 7804 and the disk drive 7808 is terminated, the system controller 7802 generates VOBI management information of the recorded VOB, and records the same VOBI management information in the M_AVFIT (image AV file information table). moving) . In addition, the corresponding PGI (program information) and the M_CI (moving picture cell information) are generated and are taxed in ORG_PGCI (original PGC information). In addition, the system controller 7802 records the date information that has been collected and recorded in the internal memory in VOB_REC_TM of the VOB in the M_VOBI (dynamic VOB information) as the recording time information. (DVD Recorder Recording Operation) The recording operation of the DVD recorder will be described below. When the user inserts the DVD-RAM into the 7808 drive, the 7808 drive notifies the 7802 system controller about the DVD-RAM insert. Then the system controller 7802 reads the administration information file "RTR.IFO" recorded on the DVD-RAM through the disk drive 7808 and stores the management information file in the internal memory. Next, the system controller 7802 notifies the user about the program information recorded on the DVD-RAM with a menu screen through the user interface 7801. As shown in Figure 42, the menu includes a number of program or a playlist number, and the recording time information of a program or a playlist. The recording date and time information can be calculated by adding the elapsed time in the VOB obtained as described above for the VOB_REC_TM. The user selects a desired program from the menu and sends an instruction to the user interface 7801, thereby notifying the system controller 7802 about the selected program through the user interface section 7801. The system controller 7802 obtains a Play start address from the head of M_CI (moving picture cell information) of the program or playlist, which is specified by the user and the M_VOBI (movie VOB information) corresponding to this cell, to send a request to read the AV data from this address to the disk unit 7808. When the request is received, the disk unit 7808 reads data from the address specified in the DVD-RAM and stores the read data in the track buffer 7807. The system controller 7802 gives a decoding start request to the decoder 7806. The decoder 7806 collects the data stored in the track buffer 7807 and performs a decoding process, which reproduces video and audio data through the output section 7805. In addition, the system controller 7802 adds the elapsed playing time (Telapse) that is counted for each time information box of recording the cell head, to obtain the recording time information for each frame, and notifying the decoder 7806 about the information of date and time of recording obtained. The decoder 7806 synthesizes the recording date and time information received with the video data, and outputs the synthesized data through the output section 7805. (VOB Data Editing) The following will describe the case in which VOB data is edited. As described with reference to Figure 16, the VOB_REC_TM recording time information of the VOB has information represented by year, month, day, hour, minute and second. There is no problem while recording and playing the VOB and deleting on a VOB unit are repeated. However, if a part of the VOB is deleted, the following problems arise. For example, when the first 10 seconds and 58 fields (29 frames) of the VOB are erased, the VOB_REC_TM should add the 10 seconds and 58 fields with respect to VOB_REC_TM indicating the recording date and time of the VOB head frame. At this time, the VOB_REC_TM can not perform accurate recording of a frame (field). Therefore, the VOB_REC_TM sum only 10 seconds without fraction of 58 fields (29 pictures). If the original VOB_REC_TM is "09:00:00, March 1, 1999", it becomes "09:00:10, March 1, 1999" after the partial erase execution. Consequently, an error of 58 fields is created (29 frames). This error is accumulated by repetition of the partial deletion process. For example, if the partial erasure for 10 seconds and 58 fields (29 frames) described above is carried out 100 times, an error of 5800 (= 100 x 58) fields is accumulated (approximately 96 seconds). Consequently, the error generated when editing is recorded in the VOB_REC_TM_SUB (VOB recording date difference information) in the M_VOBI (movie VOB information). The following relationship is formed before and after the partial erasure of the VOB head. VOB_REC_TM before partial clearing + VOB_REC_TM_SUB before partial clearing - partial clearing time = VOB_REC_TM after partial clearing + VOB_REC_TM_SUB after partial clearing (2) For example, as shown in Figure 45, when the VOB_REC_TM before partial clearing is "09:00:00 March 1, 1999" and the time or period to be deleted from the VOB is 10 seconds and 58 fields (29 frames), the VOB_REC_TM after deletion stores "09:00:10, March 1, 1999"and the VOB_REC_TM_SUB stores" 58 fields (29 frames) ". It is noted that VOB_REC_TM_SUB can record error information in each frame, or error information represented by timestamp.

(Partial Erase Operation) The partial erasure operation will be described below with reference to Figures 46 through 48. As shown in Figure 46, the system controller 7802 receives the request to delete a part of the VOB from the user through the user interface 7801 (Sil). The user request includes the delete start position and the erase period. It is determined if the part to be deleted includes a VOB queue according to the request (S12). When the part to be deleted includes the VOB queue (see Figure 49C), the deletion process is carried out for a back part of VOB (S13). When the part to be deleted does not include the VOB queue, it is determined if the part to be deleted includes the VOB head (S14). When the part to be deleted includes a VOB head (see Figure 49A), the deletion process for a VOB front part (S15) is carried out. When the part to be deleted includes the VOB head (see Figure 49B) the VOBI corresponding to the VOB designated by the user is doubled (S17). The reason why the VOBI is duplicated is that in the case of Figure 49B the partial erasure divides VOB into two parts and therefore needs to obtain VOBI used for a new VOB generated by the partial erasure. Then the erasing process for a back part of VOB is carried out for the subsequent VOB newly generated by the partial erasure (S18). The deletion process for a VOB front part is carried out for the front VOB newly generated by the deletion (S19). After the erasing process for a VOB front part, in which the erasing process is completed for a back part of VOB, or both, the substantial VOB data is erased (S16). The deletion process for a back part of VOB in steps S13 and S19 is carried out as follows. Referring to Figure 47, the final VOB presentation time (VOB_V_E_PTM) is subtracted by deletion time (Tdelete) (S131). It is noted that in the case as shown in Figure 49B, a time T "delete that is measured from the VOB queue before deletion is used as the erase time (Tdelete) .Then the time map corresponding to time The deletion process for a VOB front part of steps S15 and S18 is carried out. as follows: Referring to Figure 48, the erase time (Tdelete) is added to the VOB presentation start time (VOB_V_S_PTM) (S151) It is noted that in the case as shown in Figure 49B, a T'delete time that is measured from the VOB head before deletion is used as the erase time (Tdelete) Subsequently the editing process is carried out to update the VOB_REC_TM and VOB_REC_TM_SUB (S152-S156). obtained by dividing the deletion time Tdelete po r 60 fields (= 1 second) is added to VOB_REC_TM_SUB (S152). It is determined if the value of VOB_REC_TM_SUB is equal to or greater than 60 fields (= 1 second) (S153). When the value of VOB_REC_TM_SUB is equal to or greater than 60 fields, VOB_REC_TM_SUB is subtracted to 60 fields (S154), and VOB_REC_TM_SUB is added for one second (S155). When you move the value of VOB_REC_TM_SUB by 60 fields, VOB_REC_TM_SUB stores error of a recording start date and time that is less than 1 second. Then VOB_REC_TM is summed by erase time (Tdelete) represented in year, month, day, hour, minute and second (S156). Then the time map corresponding to the erase time (Tdelete) is erased from the front (S157). In the previous description, 1 second is treated as 60 fields in the case of the NTSC format used in Japan and the USA. A number of fields for a second depends on the TV format, in the case of the PAL format, of the European standard, 1 second is treated as 50 fields. As described above, the DVD-RAM in this mode stores recording date and time information for video data in the administration file. Therefore it is possible to quickly display a menu screen in the playback with reference in the recording time information. The DVD-RAM also has error information in addition to the recording time information. Accordingly the modification of the recording time information is carried out accurately when the editing operation such as partial erasure is carried out. Although the DVD-RAM recorder has been described in this modality, the present invention is not restricted to DVD-RAM, but can be applied to any recordable disc. In the previous description of the present modality, the recording date and time displayed in the menu are obtained in the head of the program, that is, in the headbox of the head cell. However, the date and time can be obtained in a default optional video frame (for example, 10 seconds after the frame from the top frame). The recording date and time information displayed in the middle of the reproduction were obtained by adding a time elapsed from the cell head to the data and time of the cell head in the previous description of the present modality. However, it can be obtained by adding the recording time information in each VOBU head which is calculated based on the VOBU_ENT (VOBU input) in the M_VOBI (movie VOB information) to the time elapsed in the VOBU. Furthermore, the recording time information to be displayed during the reproduction operation is displayed not for each frame but in only a time obtained by the aforementioned calculation, based on the VOBU_ENT. Although the present invention has been described in relation to specific embodiments thereof, many other modifications, corrections and applications are apparent to those skilled in the art. Accordingly, the present invention is not limited to the disclosure provided herein but is limited only to the scope of the appended claims.

Claims (32)

1. CLAIMS 1. A recording medium comprising: video data; and administration information including recording time information indicative of the date and time at which the video data was recorded. The recording medium according to claim 1, wherein the recording time information comprises a main time information that includes information of date and time of recording of the video data, represented by year, month, day, hour, minute and second, and an error time information that includes a fraction of the time of the date and time of recording the video data that is less than one second. 3. The recording medium of claim 2, wherein the error time information includes a fraction of time represented in the field unit. The recording medium according to claim 2, wherein the error time information includes a fraction of time represented by a timestamp. An apparatus for recording data in the recording medium according to claim 2, comprising: a receiving unit for receiving from the user a request to erase a part of video data; and an update unit for updating the recording time information when the video data part is deleted according to the received request. The apparatus according to claim 5, wherein the update unit updates the recording time information by adding a time to be deleted, which is expressed in year, month, day, hour, minute and second, at a value of the main time information for the video data, when the part of the video data including a head of the video data is erased. The apparatus according to claim 6, wherein the update unit updates the recording time information by adding a fraction of the time of the time to be erased to a value of the error time information when the part of the data Video that includes a head of the video data is erased. An apparatus for reproducing data from the recording medium according to claim 1, comprising: a calculating unit for calculating a recording time to be displayed by adding the elapsed time spent from a head of the video data to the recording time information of the video data during the data reproduction operation; and a synthesizing unit for synthesizing the calculated recording date and time information and the video data. 9. A method for recording data in the recording medium according to claim 2, comprising: receiving from the user a request to erase a part of video data; and updating the recording time information when the video data part is deleted according to the received request. The method according to claim 9, wherein the recording time information is updated by adding a time to be deleted that is expressed in year, month, day, hour, minute and second to a value of the main time information for video data when the part of the video data that includes a head of the video data is deleted. The method according to claim 10, wherein the recording time information is updated by adding a fraction of the time of the time to be erased to a value of the error time information when the part of the video data that includes a video data head is erased. A method for reproducing data from the recording medium according to claim 1, comprising: calculating a recording time to be displayed by adding the elapsed time spent from a head of the video data to the recording time information of the video data during the data reproduction operation; and synthesizing the calculated recording date and time information and the video data. 13. A recording medium comprising: video data; and administration information including a recording time information indicative of the date and time at which the video data was recorded, wherein the recording time information comprises a main time information that includes date and time information recording of the video data, represented by year, month, day, hour, minute and second, and an error time information including fraction of time of the date and time of recording of the video data that is less than a second. 14. The recording medium according to claim 13, wherein the error time information includes fraction of time represented in video fields. 15. The recording medium according to claim 13, wherein the error time information includes a fraction of time represented by a timestamp. The recording medium according to claim 13, wherein a video image represented by the video data comprises a plurality of video frames and where the recording time information indicates the date and time at which it is recorded. recorded a video head frame, of the plurality of video frames. 17. An apparatus for recording data in the recording medium according to claim 16, comprising: a receiving unit for receiving a request from a user to erase a part of the video image; and an update unit for updating the recording time information when the video image part including the video head frame is erased according to the received request. The apparatus according to claim 17, wherein the update unit updates the recording time information by adding time of the deleted video image part expressed in year, month, day, hour, minute and second, to a value of the main time information when the part of the video image that includes the video head frame is erased. 19. The apparatus according to claim 18, wherein the update unit updates the recording time information by adding the fraction of time of the part of the deleted video image that is less than one second, to a value of the information of error time when the part of the video image including the video head frame is erased. The apparatus according to claim 19, wherein the error time information and the fraction time include time represented in video fields. 21. An apparatus for reproducing data from the recording medium according to claim 16, comprising; a calculation unit for calculating the recording time of a frame to be displayed by adding the elapsed time spent from the video head frame to a value of the recording time information of the video data during the data reproduction operation; and a synthesizing unit for synthesizing the calculated recording time information and the video data. 22. A method for recording data in the recording medium according to claim 16, comprising the steps of: receiving a request from the user to erase a part of the video image; and updating the recording time information when the part of the video image including the video head frame is erased according to the received request. The method according to claim 22, wherein the recording time information is updated by adding the time of the part of the deleted video image that is expressed in year, month, day, hour, minute and second, to a value of the main time information when the part of the video image including the video head frame is erased. The method according to claim 23, wherein the recording time information is updated by adding the fraction of time of the part of the deleted video image that is less than one second, to a value of the information of error time when the part of the video image including the video head frame is erased. 25. The method according to claim 24, wherein the error time information and the fraction of time include the time represented in video fields. 26. A method for reproducing data from the recording medium according to claim 16, comprising the steps of: calculating the recording time of a frame to be displayed by adding the elapsed time passed from the video head frame to a value of the recording time information during the data reproduction operation; and synthesize the calculated recording time and video data. 27. A system for recording data on an optical disk, comprising: the optical disc including video data of a video image comprising a plurality of video frames and administration information including a recording time information indicative of the date and time at which the picture was recorded. video head of the plurality of video frames, wherein the recording time information comprises a main time information including recording date and time information of the video head frame represented by year, month, day, hour, minute and second, and an error time information including a fraction of time of the date and time of recording of the video head frame that is less than one second, a receiving unit to receive a request from a user to erase a part of the video image; and an update unit for updating the recording time information when the part of the video image including the video head frame is erased according to the received request. The system according to claim 27, wherein, when a plurality of successive frames including the video head frame is erased, the update unit changes a value of the main time information to a value of a first information. of time obtained by adding time from the deleted frames represented by year, month, day, hour, minute and second, to a value of the main time information, and changing a value of the error time information to a value of one second time information obtained by adding a fraction of the time of the deleted frames less than one second to an error time information value. 29. The system according to claim 28, wherein, when the value of the second time information is equal to or greater than one second, the update unit updates the value of the main time information to a value of a third time information obtained by adding a second to the value of the first time information, and updating the value of the error time information to a value of a fourth time information obtained by subtracting a second of the second time information. 30. The system according to claim 27, wherein the error time information includes the fraction of time represented in video fields. 31. The system according to claim 27, wherein the error time information includes the fraction of time represented by a timestamp. 32. A system for reproducing data from an optical disc, comprising: the optical disc including video data of a video image comprising a plurality of video frames and administration information including a recording time information indicative of the date and time in which a video head frame of the plurality of video frames was recorded, wherein the recording time information comprises a main time information including recording date and time information of the video head frame represented by year, month, day, hour, minute and second, and an error time information that includes the time fraction of the recording date and time of the video head frame that is less than one second, a unit of calculation to calculate the recording time of a frame to be displayed by adding the elapsed time passed from the video head frame to an information value of recording time during the data reproduction operation; and a synthesizing unit for synthesizing the calculated recording time and video data.