MXPA95004959A - Means of registering data and registration / reproduction device using the media of registration of da - Google Patents

Abstract

The present invention relates to a high-speed access to a multi-layer disc to be obtained, Each layer in the multi-layer disc includes a protective and internal area 2, a program area 3 and an outer protective area 5 which are placed in positions uniform radials in all layers. The top layer has the registration direction from the inner side to the outer side of the disk, and the next layer has the registration direction from the outer side to the inner side of the disk in such a way that the opposite register addresses appear alternately. The radial position of the terminal end of registration in the first upper layer coincides with the radial position of the initiation of the registration of the next second layer.

Description

• "DATA LOGGING AND RECORDING / REPRODUCTION DEVICE USING THE DATA LOGGER" INVENTORS: MAKOTO KAWAMURA, YOSHIYUKI AKIYAMA, YASUSHI FUJINAMI, JUN YONEMITSU and TOMIHIRO NAKAGAWA, Japanese citizens, domiciled in c / o Sony Corporation , 7-35 Kitashinagawa 6-chome, Shinagawa-ku, Tokyo, Japan give all their rights to SONY CORPORATION, a company duly organized and constituted in accordance with the Laws of Japan, with address at 7-35 Kitashinagawa 6-chome, Shinagawa -ku, Tokyo Japan, for the invention that is described below.

BACKGROUND OF THE INVENTION Field of the Invention This invention relates to an appropriate data recording medium for recording digital signals, for example, and a recording / reproduction apparatus used for the data recording medium.

DESCRIPTION OF THE RELATED ART Multilayer discs having a plurality of recording layers formed on a disc are already known in such a way that each layer is selectively read under focus control of an optical pickup apparatus. For example, U.S. Patent No. 5,263,011 discloses one of these multi-layer discs and a recording and reproducing apparatus using the disc. The techniques in multi-layer discs using the previously identified document does not give sufficient consideration for practical use, and it is still in the course of development. That is, there is no teaching about the actual writing and reading of data. In particular, the reproduction register of video data and / or audio data is not taken into account, using the compressed codes. On a conventional CD (compact disc), for example, your record track is formed to start from the inner side to the outer side of the disc. However, there has been no discussion of how to form record tracks on a multi-layer disc. Therefore, the conventional techniques that have been employed for single layer discs involve many problems that must be discussed hereinafter, even though they are employable in some limited cases.

OBJECTS AND SUMMARY OF THE INVENTION In view of the situation, an object of the invention is to provide a data recording means and a recording / reproduction apparatus using the data recording medium. In accordance with the invention, there is provided a disc data recording medium comprising: at least a first and a second record layer; a first register address from the inner side to the outer side of the medium, and a second register address from the outer side to the internal side of the medium which are determined as the addresses for recording the data; one of the first and second register addresses are used as the registration address of the first registration layer; . The others of the first and second registration addresses are used as the registration address of the second registration layer; and each of the record layers including a data area where the data has a sector structure, and each sector contains at least a number of layers to identify the first registration layer and the second registration layer. In the data area of each layer, the data has a sector structure, and each sector contains the number of total record layers on the disk. Registration areas are provided in such a way that an internal protective area of a respective layer overlaps with an outer protective area of another layer, and the TOC areas contain at least data for access to all layers and data to identify the respective layers . The TOC area in the upper layer is provided in a site adjacent to the data area in the upper layer. The data area of each layer has its sector structure, and the sector numbers of the respective sectors are determined according to the numbering system that allows the identification of at least the number of layers. A recording / reproducing apparatus using the data recording medium according to the invention gives access to the medium using the registration layers, the TOC areas, the structure of the sector, etc. medium. The data recording medium according to the invention can be easily accessed due to the structure of the registration tracks. Therefore, the recording / reproducing apparatus using the data recording medium according to the invention, can easily access the medium at a high speed. The foregoing, and other objects, features and advantages of the present invention will be readily apparent from the following detailed description thereof which is to be read in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view showing an aspect of the divisional areas on a disk according to the embodiment of the invention; Figures 2A and 2B are schematic views for explaining registration directions in an embodiment of the invention; Figure 3 is a schematic view illustrating an example of the TOC locations on a disk according to the invention; Figure 4 is a schematic view of an example of the dividing sectors in a disk according to the invention; Figures 5A and 5B are schematic views showing one and other examples of the Sector Directions; Figure 6 is a schematic view showing an example of the layer field; Figure 7 is a schematic view showing an example of the data representing the Number of Layers in the layer field; Figure 8 is a schematic view showing an example of the data representing the Number of Layers in the layer field; Figure 9 is a schematic view to explain a still further example of the Sector Directions; Figure 10 is a schematic view for explaining another example of TOC locations; Figure 11 is a schematic view to explain the data project of the first TOC; Figure 12 is a schematic view to explain the Project project of Disk Input in the first TOC; Figure 13 is a schematic view to explain the Layer Input project in the first TOC; Figure 14 is a schematic view to explain the project of the Track Entry in the first TOC; Figure 15 is a schematic view to explain the project of the additional TOC data; and Figure 16 is a functional diagram of a disk reproduction apparatus according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A mode of the invention will now be described. The invention is a multilayer disk wherein a plurality of recording layers is provided in the thickness direction of the disk 1. One of the disk layers closest to the surface for confrontation with a pickup apparatus is referred to as the layer of superior registration in the following description. Figure 1 is a schematic view taken from above the disk 1 to explain the areas of the multilayer disk according to the invention. The number 2 represents an internal protective area (called IGA), 3 a program area and 4 an external protective area (called OGA). In the case of the upper register LO layer, the IGA is a read input area and the OGA is a read output area. On the next Ll layer, the OGA is a read input area, and the IGA is a read output area.

The structures of the respective layers will be explained below with reference to Figures 2A and 2B. The invention involves both producing a spiral record track that separates from the inner side to the outer side of a disc and producing a spiral record track that separates from the outer side to the inner side of a disc. As for the relationship between the plurality of layers, the layers to be recorded from the inner side to the outer side of the disc and the layers to be recorded from the outer side to the inner side of the disc are alternately placed. Also, as an example, layers with even numbers, LO, L2, ... will be recorded from the inner side to the outer side of the disk, while the layers with odd numbers. Ll, L3, ... will register from the external side to the internal side of the disk. The even numbers and odd numbers used here are reference numbers assigned to the L layers only for explanation purposes, and the upper layer is assigned with an even number, LO, even if it is in the first order. That is to say, Figure 2A shows a Te track record in spial of each layer that has an even number, which is recorded from the inner side to the outer side of the disc as shown by the signal of an arrow. On the other hand, as shown in Figure 2B, the registration track To of each layer having an odd number is recorded spirally from the outer side to the inner side of the disk. In this case, reference is made to the upper layer as layer number 0, LO, where the recording continues from the internal side to the outer side of the disk. In terms of the spiral directions, the registration tracks are classified into those which have tracks of front spiral record and arrows that have tracks To of spiral record of reverse, depending on the respective layers. The layers with the front spiral record Te pits and the layers with reversed spiral record To tracks are placed to appear alternately in such a way that the data is recorded in the forward spiral record tracks in the number layers. pair LO, L2, ... and in the reverse spiral record tracks the odd-numbered layers Ll, L3, ... The upper LO layer definitely has the front spiral record track (the same address as that of typical CDs) so that a wrongly loaded disc can be distinguished even when the disc size is equal to that of typical CDs. Returning again to Figure 1, the areas of the program on the disk are formed to end in eguivalent positions. That is, the final end of the signals in each even-numbered layer and the initial end of the signals in each odd-numbered layer are approximately in the same radial positions on the disk. For example, the final end of the signals in each even number layer and the initial end of the signals in each odd number layer are placed next to each other. The approximate coincidence of their radial positions is sufficient, and their angular positions do not need to be close. More specifically, the total amount of data to be recorded on a disk is calculated, and the pickup apparatus is returned and moved in one layer to a lower layer during the reading of half the amount of the data of such so that the final end of the data reaches the same radial position as that of the internal side of the upper layer. In this way, repeated reproduction is facilitated and the access speed to move to a lower layer is increased. Therefore, as shown in Figure 1 which is taken from above the disk, the program areas of the respective layers coincide. The IGA and the OGA will be explained below. As shown in Figure 1, the internal IGA side is uniformed between the respective layers. The OGA of a respective layer is also uniformed with agüella from one of the layers that has the largest recording area (program area) in the recording medium such that the IGA and the OGA can be identified in any layer, when the reading layer is read by hopping from one layer to another close to the inner side or the outer side of the disc. On CDs, the internal data registration prohibition area and the data end are dted through the reading / readout input dtion areas. However, this is effective because the CDs are single layer. In the case of the disk according to the invention having a plurality of layers, even when the data ends in a radial position of a certain layer, another layer may have the data recorded beyond the same radial position. In this modality, even when the data in a certain layer ends up in a certain radial position, if another layer has the data registered beyond the same radical position, then the empty data (for example, the data that includes a string of zero ) is recorded in the first layer to the same radial position. Tracks that have empty data recorded are called empty tracks. If the empty data is not registered, then it may happen that the information of the head of the sector can not be found when the reading layer is changed by the focus jump from one layer of the data to another without the data. When the information of head of the sector is not obtained, it will be difficult to control the capture device and the servo control.

Next, the TOC (Table of Contents) will be explained with reference to Figure 3. Figure 3 shows the project of the record tracks, showing respective layers in a cross-sectional view of the disk. The number 2 represents the IGA, 3 represents the program areas and 4 represents the OGA. The arrows show the moving directions of the pickup device. Between the even-numbered layers and the even-numbered layers, the positions are standardized to register the IGA and the OGA. That is, the TOC of the LO layer (TOCO) and the TOC of layer L2 (TOC2) are placed in the same area. Therefore, the time required for the IGA can be reduced. The TOC of all layers (TOC00) is recorded in the upper layer. Therefore, the states of all the layers of the disk can be identified by reference to the IGA of the first LO layer alone. If the first layer LO contains the TOC of another layer, TOC00 for example, then TOCO in its own layer registers in a location closer to the program area to facilitate identification from the other layer. Therefore, the time from the IGA to the beginning of the program can be shortened. The TOC00 contains an important data that defines the disk. For example, if both conventional single layer discs and multi layer discs are acceptable as normal discs, then the TOC00 contains ID to distinguish whether the disc is single layer or multiple layer. In another example, the TOC00 contains the information indicating the total layers of a multilayer disk. In addition, by linking the TOCO with the TOCn of the respective layers, the TOC00 can have access first during an access request so that TOC determines which layer will get access next. In addition, the TOC00 may contain the largest program area radius of all the layers to prevent the pickup apparatus from reading the areas beyond the largest radius. Therefore, when different disks with different sizes are normalized, it can be avoided that a small disk is exceeded (drop of the pickup device of the program area). The data recorded on the disk has a sector structure. The sectors will be explained below with reference to Figures 4, 5A and 5B. Figure 4 shows schematically the sector structure of the first layer LO. In the example of Figure 4, a disc of a constant angular velocity (CAV) type is taken for reasons of simplification. In reality, however, a constant linear velocity type (CLV) disk is used taking into account the recording density.

The data in each layer is recorded in the sectors unit (00 to 255). Taking into account that the data of all the layers constitute a single program, it is easy to assign consecutive numbers to the sector addresses of a plurality of layers. For example, in the second layer not illustrated, sector addresses (256 to 511) are used, and in the third layer, sector addresses (512 to 767) are used. In addition, the description of the layer numbers is necessary to facilitate the selection of a respective layer. In this regard, as shown in Figure 5A, the number of layers of each sector is recorded in the subcode SC. In addition to the number of layers, the cutting direction, such as from the inner side to the outer side of the disk (or vice versa), in reverse spiral, or the like, is preferably recorded in subcode SC. Instead of describing the layer number as the subcode, combined codes can be registered with the layer number and the sector addresses as sector directions of the multilayer disk. That is, the number of layers is added as a primary bit of the sector addresses. In this case, the layer number of the top layer must be 0. Therefore, the sector addresses of the top layer are (0000 to 0255). With respect to the other layers, the sequence of the layer numbers coincides with the physical sequence of the layers. Avoid skipping layer numbers or replacing the order to facilitate switching from one layer to another. It is also possible that the layer information registered in the subcode contains the number of total record layers on the disk in addition to the layer number. Figure 6 shows this example. In Figure- 6, a one-byte layer field contains the field of the 3-bit number (b5 to b3) of the total layers and the field of the 3-bit layer number (b2 to bO). Figure 8 shows the definition of the layer numbers. Although only the LO and Ll layer numbers are defined here, the use of the field is the same as shown in Figures 5A and 5B. Figure 7 shows the definition of the numbers of the total layers. Here 1 and 2 are defined as numbers of the total record layers. For example, if both the single-layer discs and conventional multi-layer discs are acceptable as normal discs, this field is used to determine whether a disc is single-layer or multi-layer. It is further explained in another example of the header information of the sector such as the sector address. The header information contains a track number, sector address, copyright code, application code, and so on in addition to the layer number. Each track number is a 16-bit code, and values (0 to 65533) are assigned as the track numbers in the program area of the disk, where 65534 is the number of tracks in the OGA and 65535 is the number of tracks. track of the IGA. Each sector address has a length of 24 bits. In the following description, $ represents 16 figures. Each sector address is a code of two 24 bit add-ons. In the LO, L2, ..., spiral front layers, the direction of the sector increases from the inner side to the outer side of the disc. In the layers Ll, L3, ..., in reverse spiral, the direction of the sector increases from the external side to the internal side of the disk. If the record is started from $ 000000 internal in the forward spiral layers, then the registration in the backscattered layers is carried out in such a way that the address of the internal sector becomes $ 800,000, for example. In each radial position of the disk, the relation between the direction of the sector SAdO of the layer LO and the direction of the sector Sadl of the layer Ll is: SAdl = SAdO XOR $ 7FFFFF In this way, the sector directions in the same radial position Both in the front spiral layers and in the reverse spiral layers can be converted by a single calculation because the exclusive logical sum (XOR) can be calculated with $ 7FFFFF. In the case of CLV discs, in particular, the number of sectors in a track varies with the radius. Therefore, it is effective for the servo circuit to use a current position (radial information) of the acquisition apparatus to know the number of tracks that will be skipped when giving access to a specific sector. Radial information can also be obtained from the sector address by reference to the table, for example. In this case, if the sector directions are determined without taking into account the direction of the front spiral and the reverse spiral direction, then different tables must be prepared for the front spiral direction and the direction is reverse spiral. If the direction of the external sector is not normalized, then the radial information of the reference table is not calculated, and the calculation or measurement of the number of total sectors in a track will be required. Since this example is configured to assign sector numbers that facilitate the conversion of sector addresses, either in the forward spiral layers or the reverse spiral layers by simple calculation, each sector direction in any layer can be easily converted in radial information. In this way the quantity of the tables that are required can be reduced, and high-speed access is obtained. Figure 9 shows a disk project with the addresses determined in the manner explained above. The sector address of the last sector in the IGA (internal protective area) of the LO layer is equal to (-1). The track number for all sectors in IG3 is equal to 65535. The application code of all sectors in the IGA is equal to 0. The number of sectors in all program areas of a disk is the same. Tracks not used in the program area or areas on a disc are encoded as empty tracks. The internal (first) sector of the program area of the LO layer is equal to 0 (ie, $ 000000). The external sector address (last) of the program area of layer Ll is equal to $ 7FFFFF. The relationship referred to in the foregoing, namely ($ 7FFFFF = $ 00000 XOR $ 7FFFFF) exists between the two. Figure 9 shows an example of a double layer disk with three tracks in the program area of the LO layer and two tracks in the program area of the layer Ll. For example, tracks 0, 1, 2 and 3 contain user data, and track 4 is an empty track. The number of tracks in the first track of the layer Ll is equal to the highest number of tracks in the LO layer increased by one.

The first sector address of the OGA (external protective area) of the LO layer is equal to the last sector address in the program area incremented by one. The number of tracks of all sectors in the OGA is equal to 65534. The application code of all the sectors in the OGA is equal to 0. In single-layer disks, a project of the LO layer can be used. Figure 10 shows the location of the TOC on a double layer disk. Each layer contains three copies of the TOC. The TOC of each layer is placed in the IGA, and includes a first TOC and an additional TOC. The TOC is registered as one or more consecutive sectors. In the LO layer, the first addresses of the TOC sector are: -3072, -2048 and -1024. In the Ll layer, the first addresses of the TOC sector are: (-1 XOR $ 7FFFFF), (-1025 XOR $ 7FFFFF) and (-2049 XOR $ 7FFFFF). For a single-layer disk, the location of the TOC of the LO layer is applicable. The first sector project of the TOC is provided in Figure 11. The individual fields will be explained below. The "System ID" contains "HDCD" encoded in accordance with ISO 646. The "System Version Number" is the number of the description of the high-density CD system used for the disk. The first two bytes contain the major version number encoded according to ISO 646, and the last two bytes contain the minor version number encoded according to ISO 646. For example, the major version number is "01", and the number of = nor is "00". The "TOC Sectors Number" is a two-byte field that contains the coded number of sectors in the TOC. The "TOC Sector Number" is a coded number that indicates the sector sequence throughout the TOC. "0" is always registered for the first sector of the TOC. The "Disk Input" contains some parameters that indicate the properties of the disk. The disk input field project is provided in Figure 12. The "Disk Size", for example, of the disk input is a one-byte field that contains the coded outer diameter of the disk in millimeters. All bytes in the reserved field have the value of $ 00. The "Number of Layers" is a one-byte field that contains the encoded number of the data record layers on the disk. The "Number of Tracks" is a two-byte field that contains the encoded number of total tracks on the disk. "Decentering the Number of Logical Tracks" is used as an off-center value when converting the number of physical tracks to the number of logical tracks. Even when the number of physical tracks is readjusted "O" in the front head of each disk, a single track number space may be provided through a plurality of disks using the "Decentralized Number of Logical Tracks". The "Disk Application ID" contains the application code of the disk. If the disk contains an application code and zero or more empty tracks, then the disk application ID is equal to the track application code or the application ID equals $ FF. The "Volume ID" is an ISO 646 code of 16 bytes and contains the identification of the disk. A group of disks with an identical volume ID is called a volume set. The number of disks in a volume set is encoded in two bytes of the size of the volume set. The address number of a sector containing the disk information is encoded in a "Disk Information Sector" of 24 bit. The disk information sector is a code of 2 add-ons. If the disk information is not available for a disk, then the value of the disk information sector is set to -l. Off-centering of the byte within the data field of the disk user is encoded as the "Disk Information Decentral" of two bytes. If the disk information does not. is available for a disk, then the offset value of the disk information is set to $ FFFF.

In Figure 11, the "Layer O Input" contains information about the upper layer (LO), and the "Layer 1 Entry" contains information about Ll. Its contents are absolutely the same. The "Layer Input" project is provided in Figure 13. The 16 bytes of the layer input contain parameters of the layer where TOC is placed. "The Layer Number is a one-byte field indicating the number of layers. The "First Address" provides the address of the first sector sector in the program area of the layer The "First Address" is the value of the lowest sector address in the layer. The sector address of the last sector in the layer program area The "Ultimate Address" is the highest sector address value in the layer The "First Number Offset" (two bytes) provides the value of the first track number in the layer program area The "Number of Tracks" provides the number of tracks in the program area of the layer One byte of the "Layer Type" provides the type of the layer. value 0 indicates type I, value 1 indicates type II, and v alor 2 indicates type III. The values $ 1 and $ FF mean Reserved. The Reserved field has a value of $ 00. Other fields of Figure 11 are also explained. The "Editor Input" is a 64-byte field that contains the information about the disk editor. The "Manufacturer's Entry" is a 32-byte field that contains information about the manufacturer of the disk. The Reserved field has a value of $ 00. The "Track Entry" contains the data about a track on the disc. Track Entry 0 contains the data about the first track on the disc. All bytes in an unused Track Entry are graduated to $ 00. The Track Entrance N project is provided in Figure 14. 24 bits of the "Track Initiation Direction" (2-complement code) provides the sector address of the first sector in the track. The first sector in a track is the sector with the Direction, of the lowest Sector in the track. 24 bits of the "End of Track Direction" (code of 2 complements) provides the sector address of the last sector on the track. The last sector in one. track is the sector with the highest Sector Direction on the track. The "Track Copyright Code" is a one-byte field. If the Copyright Codes for all sectors on the track are the same, then the Track Copyright Code is equal to the Copyright Code of the sectors on the track, or the Track Copyright Code is equal to 255. The "Track Application Code" is a one-byte field. If the track is a single application track, then the Track Application Code is equal to the Application Code that is not empty. If the track is an application track mixed with sectors that have a plurality of Application Codes, then the Track Application Code is equal to 255. If the Track Entry describes an empty track, then the Track Application Code is equal to 254. The "Track Information Sector" is a 2-bit code of 24 bits, and indicates the address of the sector containing the track information. If the Track Information is not available for the track, then the value is set to -1. The project of the Additional TOC Sectors is provided in Figure 15. The value of the Byte Position in Figure 15 provides a starting position of a field in the data field of the user of a sector. Byte Position 0 is the first byte in the user data field of a sector. The individual fields in the project of the Additional TOC sector have the same definition as that of the individual fields in the First TOC Sector project shown in Figure 11, and its explanation is omitted. An apparatus for recording and reproducing multilayer discs according to the invention will now be explained. The data classes are immaterial for the multilayer discs according to the invention. However, for explanatory purposes only, Figure 16 shows an apparatus for decoding the variable rate data (encoded) as an apparatus used to record and reproduce the digital data of the movies that have a large amount of data in accordance with the standard. MPEG (Group of Film Experts) for example,. In Figure 16, the data on the optical disk 11 is reproduced by a pick-up apparatus 12. The pick-up apparatus 12 radiates laser light to the optical disk 11 and reproduces the data on the optical disk 11 of the reflected light. The signal reproduced by the acquisition apparatus 12 is sent to a demodulator 13 which in turn demodulates the reproduced signal from the acquisition apparatus 12 and transfers it to a sector detector 14. The sector detector 14 detects a sector data recorded in each sector of the supplied data, and supplies it to a layer separator 29. The layer separator 29 separates the address of the sector and the layer number of the sector data. The sector address SAd is supplied to a ring buffer controller 16, and the sector detector 14 sends the data to the next circuit 15 ECC, maintaining the synchronization of the sector. If the address is not detected or when the detected address is not contiguous, for example, then the sector detector 14 transfers a sector number error signal through the ring buffer controller 16 to a hop detector 28. track. If the layer separator 29 can not detect the discontinuity of the layer number, or if the detected layer number is not equal, then the layer separator 29 supplies a layer number error signal through the buffer controller 16. from ring to track 28 detector. A circuit 15 Ecc detects an error in the supplied data of the sector detector circuit 14, and then corrects the error using redundant bits added to the data, and transfers the corrected data to the ring buffer (FIFO) 17 for the runway jump . When circuit 15 ECC can not correct the error in the data, provides an error signal to track skitter discriminator 28. The ring buffer controller 16 controls the writing and reading of the ring buffer 17 and monitors an output of the code request signal from a multiple data splitter 18 to request the data. The track skip discriminator 28 monitors the output of the controller 16 of the ring buffer. When a track skip is regulated, the ring buffer controller 16 sends a track missing signal to a track skip circuit 17 so that the pickup apparatus 12 jumps from one track to another on the low optical disk 11 the reproduction 11. The track skip discriminator 28 detects an error signal of the sector number of the sector detector 14, the layer number error signal of the layer separator 29 and the signal that has occurred in error from the circuit 15 ECC, and sends a track skip signal to a tracking servo circuit 27 so that the pickup apparatus 12 jumps from one track to another on the optical disc 11 under play. The data output from the ring buffer memory 17 is applied to the multiple data separator 18. The separator 19 of the header of the multiple data separator separates the head of the packing and the head of the package of the supplied data from the intermediate ring memory 17, supplies them to the separating control circuit 21 and at the same time supplies the multiple division data in time to the input terminal G of a switching circuit 20. The output terminals (selective terminals) Hl, H2 of the switching circuit 20 are coupled to the input terminals of a video code buffer 23 and an audio code buffer 25. An output of the video code buffer 23 is coupled with the input of the video decoder 24 and an output of the audio code buffer 25 with the input of an audio decoder 26. A code request signal from the video decoder 24 enters the video code buffer and a code request signal from the video code buffer 23 enters the multiple data separator 18. The video data decoded by the video decoder 24 complies with the MPEG standard referred to above, wherein three different images by three different coding methods, namely the intra-frame encoded image. (normally called the I-image), the inter-frame predictive coded image (usually called the P-image) and the bi-directional inter-frame predictive coded image (usually called the B-image), provide a predetermined group (called GOP). Similarly, a code request signal from the audio decoder 26 enters the audio code buffer 25 and a code request signal from the audio code buffer 25 enters the multiple data separator 18. . The audio data decoded by the audio decoder 26 can here again meet the MPEG standard, or it can be either a compressed digital audio code data or an uncompressed audio data by ATRAC (mark) proposed by the present Applicant. The behaviors of the respective elements of the data decoding apparatus are explained below. The acquisition apparatus 12 radiates laser light towards the optical disc 11 and reproduces the data recorded on the optical disc 11 of the reflected light. The reproduction signal from the pickup apparatus 12 is supplied to and demodulated in the demodulator 13. The data demodulated by the demodulator 13 enters the ECC circuit 15 through the detector 14 of the sector for error detection and correction. If the sector number (address assigned to each sector of the optical disk 11) is not properly detected, then an error signal of the sector number of the track skitter discriminator 28 is sent. When a piece of information is found that can not be corrected, the ECC circuit 15 sends the signal that an error has occurred to the track skip discriminator 28. The corrected data is supplied from the ECC circuit number 15 to the ring buffer 17 and stored therein. The output (sector data) of the sector detector 14 is supplied to the layer separator 29 and is separated into the layer number LNo. and the sector address SAd. As he . Layer number as the address of the sector are supplied to the ring buffer controller 16. If the layer number (layer number registered in a sector of the optical disc 11) is not normally detected in the layer separator 29, a layer number error signal is sent to the track skitter discriminator 28. The ring buffer controller 16 reads the layer number LNo. and the sector address SAd, and designates a write address (write indicator (WP)) in the ring buffer 17 corresponding to the Sad address. When the optical disk 11 is first reproduced by the data decoding apparatus, the information about the optical disk 11, either single layer or multiple layers, and how many layers it has, is important for the servo circuit. Therefore, during the first reproduction of the optical disk 11, the number of recording layers on the disk is provided from the layer separator 19 to the driver controller not illustrated, and to the servo circuit 27. In this way reliable reproduction is ensured. In addition, the ring buffer controller 16 designates a read address (read indicator (RP)) of the data written in the ring buffer 17 based on the code request signal from the multiple data separator 18. of next step, then reads the data of the read indicator (RP), and supplies the same to the multiple data separator 18. The separator 19 of the head of the multiple data separator 18 separates the bundling head and the bundle header from the supplied data from the ring buffer memory 17 and supplies them to the separator control circuit 21. According to the ID information stream of the package head supplied from the separator 19 of the head, the control circuit 21 of the separator sequentially connects the input terminal G with the output terminals (selective terminals) Hl, H2 for appropriately separating the division multiple data into time and supplying the same to a corresponding code buffer. The video code buffer 23 generates a code request to the multiple data separator 18, depending on the amount of the code buffer currently retained therein, and stores the received data. The video code buffer 23 accepts a code request from the video decoder 24, and supplies the data retained therein. The video decoder 24 reproduces the video signal from the supplied data, and sends it through the output terminal 31. Depending on the amount of the code buffer currently held within, the audio code buffer 25 issues a code request to the multiple data separator 18 and stores the received data. The audio code buffer 25 accepts a code request from the audio decoder 26 and supplies the data retained therein. The audio decoder 26 reproduces the audio signal of the supplied data and sends it through the output terminal 32. Therefore, the video decoder 24 requests the data to the video code buffer 23, the video code buffer 23 in turn issues a request to the multiple data separator 18 and the multiple data separator 18 issues a request to the ring buffer controller 16. In response, the data flows from the intermediate memory 17 in the opposite direction in relation to the address of the requests.

When the amount of the data consumed in the video decoder 24 in a unit time decreases due for example to the processing of the data in simple images continued for a certain time, the amount of the data read from the ring buffer 17 also decreases. In this case, the amount of data stored in the ring buffer 17 increases. In order to avoid possible overflow, the track skip discriminator 18 calculates (detects) the amount of the data currently stored in the ring buffer 17 by means of a write indicator (WP) and a read indicator ( RP). When the amount of the data exceeds a predetermined reference value, the track skitter discriminator 18 determines a possibility of overflow in the ring buffer 17 and sends a track skip command to the tracking servo circuit 27. When the track skitter discriminator detects a sector number error signal of the sector detector 14 or a signal that an error has occurred from the ECC circuit number 15, it calculates the amount of the data retained in the ring buffer 17. in view of the write indicator (WP) and the read indicator (RP), and determines a necessary amount of data for reliable reading from the ring buffer 17 to the multiple data separator 18 during a revolution of the disk 11 (during the wait time of one turn of disk 11). When the amount of the remaining data in the ring buffer memory 17, a subflow in the ring buffer 17 does not occur even when the data is read from the ring buffer 17 at a maximum transfer rate. Therefore, the track skip discriminator 28 determines that the error can be corrected by reproducing the location of the error again by the pick-up apparatus 12, and sends a track skip command to the tracking servo-circuit 27. When the track skip command is sent from the skip track discriminator 28, the tracking servo circuit 27 acquires the position for playback by the pick-up apparatus 12 so that it jumps to the internal position of a track. Then, in the ring buffer controller 16, writing of a new data to the ring buffer memory 17 is forbidden until the position for reproduction reaches the position before the jump after another revolution of the optical disk 11, is say, until the sector number obtained from the detector 14 of the sector coincides with the sector number just before the track skip, and the data already stored in the ring buffer 17 is transferred to the multiple data separator 18 if it is necessary. After the track skip, even if the sector number obtained from the sector sector 14 matches the sector number just before the track skip, if the amount of data stored in the ring buffer 17 exceeds the predetermined reference value , that is, if there is a possibility of overflow in the ring buffer memory 17, then the writing of the data in the ring buffer 17 is not resumed, and another track jump is carried out. When the reproduction of the first layer is terminated, the address of the sector SAd arrives at a predetermined address, for example, the address (255). The ring buffer controller 16 which detected the predetermined address supplies a layer switching signal to the focusing servo circuit 30 and the tracking servo circuit 27. The focusing servo circuit 30 shifts the focusing of the pickup apparatus 12 from the first layer to the second Gap. The follow-up servo circuit 27 interrupts the tracking servo control for a period of time until the change of focus to the second layer is achieved. The reason why the tracking servo control is interrupted once is that a tracking error signal is not obtained during the dislocation of the focus from the first layer to the second layer. When the tracking is complete, the detector 14 of the sector sends a sector data of the second layer and the layer number Ln n = l) and the sector direction SAd (= 256) are obtained by the layer separator 19. If the recorded data is a video data in accordance with the MPEG standard, the first image of the second layer of preference is called Intra (image I) to minimize the decoding time. A certain period of time is set so that the focus of the pickup apparatus 12 moves from one layer to another. However, the ring buffer 17 can store a quantity of data corresponding to time, and the continuous reproduction of the movable images is ensured. If the amount of the stored data is insufficient, the problem can be solved as will be explained below. For example, the same data can be written in both the outer track and the first layer, and the outer track of the second layer in such a way that the direction of movement of the pickup apparatus can be reversed at a point in the middle of the track. As another method to solve the problem, immediately before the first layer ends, that is, when the direction of the sector reaches up to about 253 and 254, for example, all the data after that can be written into the memory 17 intermediate ring to the extent that it does not cause overflow of the ring buffer 17. The ring buffer memory 17 usually has extra space for storing the data in order to avoid subflow and overflow. Therefore, a flag for investment can be contained in a predetermined sector number, if the number of sectors is set, or in the subcode of the sectors if the number of sectors is variable. Although the arrangement of Figure 16 is for a disc reproduction apparatus, a disc registration apparatus can be produced using a recording capable disc such as a magneto-optical disc, a phase change type disc, and so on. successively as the optical disk 11. In this case, sector synchronization signals, sector addresses, and other such information are pre-prepared in a format and the data is recorded in predetermined locations using the pre-prepared information in format. Even though a specific example has been described as the top registration layer having the registration address from the internal side to the external side, the registration address may be opposite. Furthermore, even when the example uses spiral tracks, the invention is also applicable to a different example using concentric tracks. As explained above, since the data recording medium according to the invention is configured to alternately change the registration direction between a plurality of recording layers, it facilitates the transfer from one layer to another at a high speed and allows access Quick. Furthermore, with the recording / reproducing apparatus for this data recording medium, the change from one layer to another during recording or reproduction is uniform and high-speed access is possible. Having described a specific preferred embodiment of the present invention with reference to the accompanying drawings, it will be understood that the invention is not limited to that precise embodiment, and that various changes and modifications may be made therein by a person skilled in the art. without deviating from the scope or spirit of the invention as defined in the appended claims.

Claims (10)

N O V E D A D I N V E N C L I N Having described the invention, it is considered as a novelty, and therefore, the content of the following CLAIMS is claimed as property:

1. A data record medium in the form of a disc comprising: at least one first and second recording layers - a first registration address from the internal side to the external side of the medium and a second recording direction from the external side to the external side of the medium that is determined as the addresses for the record data; one of the first and second register addresses is used as the registration address of the first registration layer; the other of the first and second registration addresses is used as the registration address of the second record cap; and each of the record layers includes a data area where the data has a sector structure, and each sector contains at least a number of layers for 0 identify the first record layer and the second record layer. The data recording medium according to claim 1, wherein: the data recorded in the data areas of the first and second recording layers is regulated to have the structure of the sector; and each sector contains at least one layer number. 3. The data recording medium according to claim 1, wherein: the data recorded in the data areas of the first and second recording layers is regulated to have the structure of the sector, and each sector contains at least a number of record layers on the disk. The data recording medium according to claim 1, wherein: the final end of the data in the first recording layer and the initial end of the data in the second recording layer are placed in circles essentially equal in diameter. 5. A recording apparatus comprises a means for recording the data in a disc data recording medium comprising: at least a first and a second recording layer; a first recording direction from the inner side to the outer side of the medium and a second recording direction from the outer side to the outer side of the medium which. it is determined as the addresses to record the data; one of the first and second register addresses is used as the registration address of the first registration layer; the other of the first and second register addresses is used as the registration address of the second register layer; and each of the record layers includes a data area where the data has a sector structure and each sector contains at least a number of layers to identify the first registration layer and the second registration layer. 6. A recording apparatus comprises means for recording the data in a disc-shaped data recording medium comprising: at least a first and a second recording layer; a first registration address from the internal side to the external side of the medium and a second registration address from the external side to the external side of the medium which is determined as the addresses as the registration data; one of the first and second register addresses is used as the register address of the first register layer; another of the first and second register addresses is used as the registration address of the second register layer; and each of the record layers includes a data area where the data has a sector structure, and each sector contains at least a number of record layers on the disk. 7. A reproduction apparatus comprises a means for reproducing the data of a data record medium in the form of a disk comprising: at least a first and a second record layer; a first registration address from the internal side to the external side of the medium, and a second registration address from the external side to the external side of the medium that is determined as the addresses for the registration data; one of the first and second register addresses is used as the registration address of the first registration layer; the other of the first and second register addresses is used as the registration address of the second register layer; and each of the record layers includes a data area where the data has a sector structure and each sector contains at least a number of layers to identify the first registration layer and the second registration layer. 8. A reproduction apparatus comprising a means for reproducing the data of a disc data recording medium comprising: at least a first and a second recording layer; a first registration address from the internal side to the external side of the medium, and a second registration address from the external side to the external side of the medium which is determined as the addresses for recording the date- one of the first and second registration addresses it is used as the registration address of the first registration layer; another of the first and second registration addresses is used as the registration address of the second registration layer; and each of the record layers includes a data area where the data has a sector structure, and each sector contains at least a number of record layers on the disk. 9. A recording / reproducing apparatus comprising: means for recording the data in a data record medium in the form of a disk; and means for reproducing the data from the data recording medium wherein the data recording means comprises: at least a first and a second record layer; a first registration address from the internal side to the external side of the medium, and a second registration address from the external side to the external side of the medium which are determined as the addresses for recording the data; one of the first and second registration addresses is used as the registration address of the first registration layer; the other of the first and second registration addresses is used as the registration address of the second registration layer; and each of the record layers includes a data area where the data has a sector structure, and each sector contains at least a number of layers to identify the first registration layer and the second registration layer. 10. A recording / reproducing apparatus comprising: means for recording the data in a disc-shaped data recording medium; and a means for reproducing the data of the data recording medium wherein the data recording means comprises: at least a first and a second record layer; a first registration address from the internal side to the external side of the medium, and a second registration address from the external side to the external side of the medium which are determined as the addresses for recording the data; one of the first and second register addresses is used as the registration address of the first registration layer; the other of the first and second register addresses are used as the register addresses of the second register layer; and each of the record layers includes a data area where the data has a sector structure, and each sector contains at least a number of record layers on the disk. SUMMARY OF THE INVENTION High-speed access to a multi-layer disk will be obtained. Each layer in the multilayer disc includes a protective and internal area 2, a program area 3 and an outer protective area 5 that are placed in uniform radial positions in all layers. The top layer has the registration direction from the inner side to the outer side of the disk, and the next layer has the registration direction from the outer side to the inner side of the disk in such a way that the opposite register addresses appear alternately. The radial position of the recording terminal end in the first upper layer coincides with the radial position of the registration initiation in the next second layer. In testimony of which, I have signed the previous description and novelty of the invention as a proxy of SONY CORPORATION, in Mexico City, Federal District, today November 28, 1995.