MXPA01006280A - Record carrier of a read-only type and read device - Google Patents

Abstract

A record carrier of a read-only type has information in a track. The information is subdivided in addressable blocks and a number of blocks constitute an information unit. The information unit is the minimal unit for error correction according to a format for writable record carriers. On the read-only record carrier a linking area is provided between information units. This has the advantage that compatibility with recordable record carriers is improved.

Description

Recording carrier of read-only type and playback The invention relates to a recording carrier of the read-only type consisting of information in a track. The invention also relates to a method for manufacturing a recording bearer of the read-only type in which method a recording layer of the recording bearer is provided with marks constituting a track representing information. The invention also relates to a reading apparatus for reading the recording carrier.

Recording carriers of the read-only type are well-known, for example, the compact disc (CD, for its acronym in English). Said read-only type recording carriers are manufactured in a mass production process, for example, the record carriers are stamped with replicas of a master disk. For this reason, the information is applied to the recording bearer in one step, and the track has a single continuous pattern of marks representing that information. The information is subdivided logically into blocks of blinking data words and corresponding control words, such as addresses. A steerable block is the number of data words that are handled logically as an element of the data, for example, 2048 bytes. Therefore, steerable blocks constitute logical amounts of user data that can be retrieved individually, such as computer data on a CD-ROM. On the other hand, recording carriers of the recordable type are generally provided with information on a recording apparatus by writing information signals on a track made consecutively or randomly on Selected locations. Said recording in different sessions in time can occur in a recording device or in different recorders. The recording in different sessions of adjacent information signals in the track is called union (linking). A method and an apparatus for sequentially joining the information signals recorded in a recording carrier in which it can be recorded are known in US 5,187,699. The minimum amount of information that has to be recorded without interruption by said information signal is determined, among other things, by the error correction system. This quantity is called the information unit and consists of a number of logically steerable blocks, at least one, but usually 8 or 16, and Error Correction Codes (CCE) that cover said blocks. The information units are for recording in previously defined locations indicated by the position information in the previous groove. So between the units of information there must be a limit between the signals recorded at different times, called union position. In the known joining method, after a first information signal is completely recorded, the recording process continues for a predetermined period after the last structure of the signal reaches the joining position. When a next information signal is to be recorded, the recording process starts at the joining position when adding simulated information (generally zero data) to the beginning of the next previously defined location. Therefore, the area between the information units does not contain valid information, and is called the joining area, which includes said joining position. In general, the rules for storing information in the track of a recording carrier are called format, as a format for recording carriers of the type in which it can be recorded. One problem is that the apparatus for reading various types of recording carriers must first distinguish between the read-only type and the type that can be recorded, before the reading, the signal may decode according to the correct format. Simple reading apparatuses that are equipped only for reading the format of the recording carriers of the read-only type may have problems in reading said joint area, which results in errors in the output signals.

A goal of the invention is to provide a engraving carrier and a reading device that allow an effective union and that omit begging problems. For this purpose, the engraving bearer of the type of soto reading as described in the opening paragraph has a track consisting of information subdivided into information units constituted by a predetermined number of steerable blocks, said track also being composed of connecting areas provided between the information units according to a format for engraving bearers of the type in which it can be recorded. In addition, the apparatus described in the initial paragraph is provided with means that process the signal to retrieve the information and undo the area of union. The effect of the binding area on the recording-type carrier of the read-only type is that the apparatuses need to be equipped only for reading a format and can read the discs on which it can be recorded without any disturbance of the reading process, since Union area is part of the format. Compatibility between different types of engraving bearers is also improved, since the storage capacity of the engraving bearer of the read-only type is not greater than the capacity of the type in which it can be engraved, due to the presence of bonding areas. in both types, and because the relationship between the logical addresses of fos blocks and their fixed locations can be the same in both types.

The invention is also based on the following recognition. In general, much effort is required to provide the binding for recording carriers of the type in fos that can be recorded that will be compatible with the recorder carriers of the read-only type. Such a joining system may require a high-density recording apparatus to create only a small bond area that can be addressed by the error correction system that is provided in the players for the read-only recorder carriers. In order to provide the binding area already in the disk format of read-only type, the reading device is less complicated, since it only needs to decode a format. In addition, the engraving apparatus does not require such a tight binding junction, but can create a normal size bonding area.

A preferred embodiment of the engraving carrier is characterized in that the information is encoded by means of a channel code for a coded signal that is composed of structures and in which the joining area of two structures is composed.

This has the advantage that the first structure of the joining area can be used in a recording system to facilitate the unloading area for the previous information unit, while the second structure facilitates an area of the input unit for the unit. of following information. For this reason, a minimum loss of capacity is achieved. In another ipcorporadon of the engraving bearer, at least one joining area consists of auxiliary information. This has the advantage that the auxiliary information is available externally for read-only recording carriers, for example, copy protection data, and can not easily be copied to record carriers of the type in which it can be recorded, since in the standard recording apparatus the content of the joint area can not be externally influenced. In the appended claims, other advantages and preferred embodiments according to the invention are given.

These and other aspects of the invention will be apparent and described below with reference to the incorporations described by way of the example in the following description and with reference to the accompanying drawings, in which: Figure 1 shows a gravure carrier, The Figure 2 shows a reading apparatus, Figure 3 shows a number of attached information units, and Figure 4 shows a joining area. The corresponding elements in the different figures have identical reference numbers.

Figure 1a shows a disk-shaped engraving carrier 11 having a track 19 and a central hole 10. The track 19 is arranged according to a spiral pattern of turns that substantially constitute parallel tracks in the information layer. The engraving holder can be read optically, it is called an optical disc, and it is read-only type. The information is represented in the information layer by markings that can be detected optically along the track, for example, slits manufactured when pressing. The track consists of position information, such as addresses, to indicate the location of the data blocks. A number of blocks constitute an information unit, which is provided with error correction codes and is the minimum amount of data required for an error correction process in a reading device. Figure 1b is a cross section taken along the line b-b of engraving carrier 11, in which a transparent substrate 15 is provided with a reflective layer 16 and a protective layer 17. The track 14 can be implemented as a slit or elevation, and the marks are provided in the longitudinal direction of the track representing the information. The engraving carrier 11 carries information represented by marks, which result in a modulated signal when they are detected optically. The modulated signal is subdivided into structures. A structure is a previously defined amount of data proceeded by a synchronization signal. In general, these structures also consist of error correction codes, such as parity words, which are related to the number of data blocks, that is, a large number of structures. With the DVD system, an example of said engraving system is known, in which the structures carry 172 data words and 10 parity words, the example of which is used in the following description. The data is organized in blocks of 2 KB and in units of information that are composed of 16 blocks, for so much, the size of this unit is 32KB of user data. The unit consists of a number of structures containing error corrector codes (CCE) to correct errors in user information in the unit, and contains 2 layers of error correction. The first error corrector layer (called C1) corrects small errors, such as random errors, and the second layer (called C2) corrects large errors, such as failure errors. A recording device must be able to write and / or rewrite said block independently. Therefore, a block is preceded by an input acid area that does not contain user data, but a pattern dedicated to establishing the electronic reading system (for example, gain frequency and PLL phase). In addition, in general, the block is also propordona with a discharge area to avoid an abrupt end of the reading signal, which can disrupt the electronic reading system. Thus, there is an area of union between the units for engraving bearers in which it can be recorded. The size of the area union can be equal to a block of data or, induso, to a unit of information. According to the invention, the joining area is introduced into the read-only engraving carrier having a content equal to or similar to that of the recording carrier in which it is to be written. The advantage is that the reading apparatus does not have to detect which type of engraving bearer is to be read, since the format of the data storage is the same. In an embodiment, the joining area consists of 2 structures. There will always be some errors in a binding position, but any errors that may occur when the unit is recorded can be placed in the first structure, while the errors just from a grab can be placed in the second structure. In another incorporation, the junction area is subdivided into a download field that follows the previous data block, a spade and an input ddo field that precedes the next data block. Figure 2 shows a reproduction apparatus for reading a engraving carrier 11, said engraving carrier is identical to the engraving carrier shown in figure 1. The apparatus is provided with a drive unit 21 for rotating the recording carrier 1, and a read head 22 for sweeping track 19 on the engraving carrier. The apparatus is provided with a posidon unit 25 for placing the read head 22 on the track in the radial direction (perpendicular to the direction of the track). The read head consists of an optical system of type conoddo to generate a beam of radiation 24 guided through optical element and focused to the radiating point 23 in a track of the information layer of the recording carrier. The radiator beam 24 is generated by a radiation source, such as a laser diode. The read head also consists of a focusing acrodder for moving the focus of the radiation beam 24 along the optical axis of said beam and a track gripper for a fine position of the point 23 in a radial direction in the center of the beam. track. The track actuator can be composed, for example, of coils for moving radially a optical element or a piezo element to change the angle of a reflecting element with respect to the optical axis of the beam 24. The radiation reflected by the information layer can be detected with a normal sensor, such as a four-quadrant diode, at the head of the optical element. 22 reading to generate a LED signal and in addition the signals of the detector include a track error and a focus error signal, which are applied to said track and casting actuators. A reading means 27 processes a LED signal to recover the data, such reading means is of the usual type, for example, it consists of a channel decoder. The recovered data is passed to a data selector 28. The data selector selects the information units and jumps the read signal from the junction areas between the information units. The selected data is passed to the error correction unit 29, which performs error correction to generate an output signal 30. In a different embodiment, there are no separate data selectors, since the error correction unit is propordona with a conductor of estrudura that detects the structures in the LED signal, and undoes the union struduras and combines the strudings that constitute a unit of information. The apparatus is also provided with a control unit 20 for redirecting commands from a user or a host computer to control the apparatus via the control lines 26, for example, a system bus, connected to the drive unit 21, the unit of posidon 25, the LED means 27 and the data selector 28 and, possibly, also the error corrector unit 29. For this purpose, the control unit 20 consists of a system of control cubicles, for example, a microprocessor, a program memory and control doors, to carry out the usual control procedures. The control unit 20 can also be implemented as a state machine in logic circuits.

Figure 3 shows a number of joined information units. A part of a logical sequence 31 of information units is indicated. A first information unit 32 is called N-1 and is followed by a joining area 33. Thereafter, a next information unit 34 is called N, followed by a joining area 35 and a third information unit 36 called N + 1 Each pair of information units is separated by a joint area and, therefore, in a recordable system, it is possible to record a compatible record carrier without difficulties. It should be noted that the sequence as shown in FIG. 3 is present in a read-only recording carrier that does not require any binding area. However, since the reproducing apparatus is arranged to face the joining areas, any recorded recording carrier can be read reliably in the same apparatus. In one embodiment, the joint area has a length of two courses as described below with reference to Figure 1. Figure 4 shows a joint area. A detail of the logical sequence 31 of the information units is indicated. The preceding information unit 32 is called N-1 and is followed by a junction area 33 and the next information unit 34 is called N. The junction area 33 is subdivided into a discharge field 41 adjacent to the preceding unit 32, a spade 42, and an input ddo field 43 immediately before the data area of next unit F. The input ddo field and the discharge field may be filled with a predetermined pattern of marks, usually short marks to synchronize a LED clock when the LED is made. The spade 42 does not have a specific content of prescribed data in the engraving bearer of the type in which it can be recorded, since it remains unrecorded. By recording several information units consecutively, the swords can also be recorded. On the LED-only disc, the space may be an unrecorded area or may have some random data pattern. For the engraving, the space has the advantage that the field of discharge and the field of entry do not overlap and, therefore, are reliable and without unexpected errors. In another embodiment, the binding area in the LED-only engraving carrier can be used to accommodate auxiliary data, such as access control data, a decoding dave or a unique disk identification number. In particular, the swordstock can advantageously be used to store copy control information, since in a recorder, the content of the binding area can not be externally influenced by the user and, in particular, the space can not be filled. Although the invention has been explained by incorporating using the CD and DVD optical engraving format, it can be applied to any format used to store information units. For example, the engraving bearer may also be a disc or a magnetic-type tape. It should be noted that the invention can be implemented by means of hardware and software, and that in this document the phrases' consists of 'and' consists of 'do not include any other elements or steps than the ones listed and the word' a 'preceding any element does not exempt the presence of a plurality of said elements, that any reference sign does not limit the area of the claims, that' means' can be a single element or a plurality and that various' means' can be represented by the same hardware element. In addition, the area of the invention is not limited to the incorporations and the invention lies in each novel feature or combination of characteristics described above.

Claims (7)

1. CHAPTER CLAIMING Having described the invention, it is considered as a novelty and, therefore, the content is claimed in the following: CLAIMS 1. A recording carrier of the type of soto reading that is composed of information in a track, the information is subdivided into units of information (32, 34, 36) that are constituted by a predetermined number of dirigible blocks, the track also It consists of junction areas (33, 35) provided between the information units according to a format for recording carriers of the type that can be recorded.
2. 2. A gravure carrier according to claim 1, wherein the information is encoded for a coded signal consisting of structures and wherein the junction area (33, 35) consists of two conditions.
3. A recording bearer according to claim 1, wherein the junction areas (33, 35) are composed of a discharge field (41), a spade (42) and an entry field (43). ).
4. 4. A recording carrier according to claim 1, wherein at least one joining area (33) consists of auxiliary information.
5. 5. Method for manufacturing a recording-type carrier of the LED-only type, in which a layer of information of the recording carrier is provided with marks that constitute a track representing information, in which the information is subdivided into units of information ( 32, 34, 36) constituted by a predetermined number of steerable blocks, and wherein the track is propordonated with junction areas (33, 35) between the information units according to a format for engraving bearers of the type in which it can be recorded.
6. 6. A reading device for reading a recording-type carrier of the read-only type consisting of information in a track, f information subdivided into information units (32, 34, 36) constituted by a predetermined number of steerable blocks, said The track further comprises junction areas (33, 35) provided between the information units according to a format for engraving bearers of the type in which it can be recorded, said apparatus being propriounded with means that process the signal (28) for recover the information and get rid of the union areas.
7. 7. The reading apparatus according to claim 6, wherein the means that process the signal (28) comprises means for deriving the auxiliary information from at least one joining area (33).