CN1892869A - Information reproducing equipment - Google Patents

Abstract

In a system that records compressed video and audio signals and computer user data in units of magnetic disk sectors, in order to reproduce data at high speed in a simple manner, data recorded in a magnetic disk is layered into data in predetermined units so that each A final data is augmented with a first error correction (C1) code, forming a (C1) correction block. Sectors are generated, each sector comprising a number (C1) of correction blocks. Added to each (C1) correction block is a sector-identifying code. A second error correction (C2) code is added to all data in multiple (C1) correction blocks to record the final data in the disk so that interleaving and deinterleaving can be done in one block. The capacity of each sector is set substantially equal to the capacity of a plurality of transport packets.

Description

Information reproduction equipment (this application is a divisional application of the same-named application with application number 03101601.4 filed on February 24, 1996)

technical field

The present invention relates to an apparatus for recording and/or compressing video and audio signals and/or computer application data on a recording medium such as an optical disc.

Background technique

An optical disc dedicated to reproducing a stored signal has been described in detail in the Japanese document "CD-From Audio to Personal Computer" by Kenji Hayashi, published by Corona Ltd. on July 25, 1990. In Hiroshi Fujiwara. Compressed video and audio signals are described in detail in the Japanese document "New Moving Picture Special Group (MPEG) Text" published by ASCII Ltd. on August 1, 1994.

In the previous article, in order to add error correction codes to data written consecutively on a compact disk (CD) in advance, a CD error correction method has been described, in which the first and second error correction codes are added And by changing the amount of delay associated with the first and second correction codes for each data, oblique interleaving (incomplete interleaving of blocks) not completed within one block is performed to convert the data arrangement, and a CD is described - ROM (Read Only Memory) signal recording method in which a CD storing audio signals is used for application data. Also, according to the latter article, a method of compressing video and audio signals and a method of multiplexing the compressed signals have been described. According to these documents, although compressed video and audio signals are recorded on media and computer user data is recorded therein in data applications, any method of efficiently recording signals and data on media has not been described.

Contents of the invention

As described in "CD - From Audio to PC", the data reproduced from the compact disk of the CD player is error corrected using the first error correction (C1) code, the diagonal blocks are not completely interleaved, that is Incomplete oblique interleaving of data arrangement and error correction using a second error correction (C2) code are transmitted within one block by changing the delay amount of each data, thereby generating output data. Therefore, the error correction capability is improved by the interleaving process. Further, even when errors occurring in consecutive positions on the disk cannot be corrected, errors in the output data due to the output order of data differing from the order of data on the disk can be dispersed. Therefore, for audio data, such errors can be accurately interpolated according to data items before or after erroneous data, respectively. However, when compressed video data is recorded on a disk, correction using data interpolation based on previous and subsequent data items cannot be employed. Conversely, if interpolation is applied to this case, the margin of error is unfavorably enlarged in the output data. This problem can be solved as follows. For data recorded on the magnetic disk in the order of the first correction code sequence, error correction is performed using the first correction code. For the finally obtained data, the oblique block incomplete interleaving operation is performed. Then, error correction is performed on the interleaved data after the second error correction using the second correction code, and the data is output in the order of the first correction code sequence, thereby generating the data in the same sequence as the original sequence before the encoding operation. When recording data, the encoding process is performed in the reverse order of the above. However, when this technique is employed for data applications in a computer or the like, since error correction is performed based on the C2 code for a particular data block to be reproduced, it is necessary to reproduce the entire data of the data block within the range of the interleaving process. If the code length is small, the time period for reproducing data in this range is very short, so the influence of data reproduction on data access time is negligible. However, to reduce the redundancy of the code, if the length of the code is increased, the extended reproduction time will adversely affect the data access time. Furthermore, video data also occupies a large capacity in a compressed state. Therefore, to record such video data on a magnetic disk having a limited capacity, it is necessary to reduce the redundancy of codes representing the video data. However, when the length of the code used in code correction is lengthened and thus the block unit in which the correction code is performed is also increased to accept a value several times larger than the sector value (2048 bytes) used as a standard data unit in a computer value, data recording and reproduction operations can only be realized in block units where correction codes are completed. In addition, other problems arise even if error correction codes are added to perform data recording and reproduction operations within error blocks. As a result, when writing data of one sector on a magnetic disk usable for data recording and reproducing operations, it is necessary to write one block data including data of one sector and dummy data. Therefore, when data reading and writing operations are performed in smaller units such as in one sector unit, there arises such a problem that the recording capacity on the magnetic disk increases and a large number of useless areas occur.

In addition, as described in "New MPEG Text", when recording video and/or audio signals compressed in a stream format including 188-byte transport packets on a CD-ROM used as a computer data recording medium , since each sector of a CD-ROM includes, for example, 2048 bytes, and the basic data capacity of other computer data recording media is similarly expressed in units of powers of 2, if video and/or audio signals are recorded on all user area to improve recording efficiency, then some transfer packets will be scattered and written in different sectors. This has the disadvantageous result of complicating the data reproduction operation. On the other hand, in order to simplify data processing, if a plurality of transport packets are written in one sector, and the useless data area of the sector is regarded as an invalid area, there will be a problem that the data recording efficiency will be reduced. The above-mentioned problems regarding data access efficiency and useless recording capacity available for recording and reproducing operations in a magnetic disk can be solved as follows. Data items input in a time series are evenly divided into data blocks, each data block including the same number of data items. Additional data is then added to each data block to form a SYNC (synchronization) block, and a synchronization code is added to the SYNC block to form a sector including C SYNC blocks (C is a natural number). A correction block consisting of P sectors is formed. Divide the correction block into C1 and C2 data blocks, add the first error correction code and the second error correction code to the C1 and C2 data blocks respectively, so as to record the data items input in a time sequence while keeping the order of the data items unchanged .

The above inconsistencies related to the processing of video and audio signals and the application of data can be resolved by the following procedure. If C main data parts (C is a natural number) of the SYNC block are used, a sector unique to the medium is formed, and the additional data in the sector unit is determined by the sector capacity being set to a multiplication of 2 square, and the integer multiple of the transport stream capacity is greater than the sector capacity and less than the sum of the sector capacity and the additional data of P blocks.

In addition, information indicating the address position of the descriptive sector is added to each SYNC block, and the increment of the position according to the descriptive information indicates the sector address of a number assigned to the sector, which facilitates reproduction of desired data.

Since all error correction codes are stored in n C1 correction blocks, the data of the target sector can be reproduced by performing data reproduction through n C1 correction blocks.

Further, a predetermined number of transport streams recorded on the medium in a sector include main data unique to the medium and the additional data formed in the sector unit in any case. That is, the transport stream cannot be dispersedly recorded in a plurality of sectors, and a sector address is assigned to each sector, thereby facilitating data access operations.

Description of drawings

These and other objects and advantages of the present invention will become more apparent with reference to the following description and accompanying drawings, in which:

Fig. 1 to Fig. 7 respectively represent the schematic diagrams of formats adopted in the first to the seventh embodiments of the information recording method of the present invention;

Fig. 8 shows the flowchart of the information regeneration method in the eighth embodiment of the present invention;

Figure 9 shows a block diagram of the structure of an information reproduction device in an eighth embodiment of the present invention;

Fig. 10 is a flow chart showing the information reproduction method in the tenth embodiment of the present invention;

Fig. 11 shows the schematic diagram of the format adopted in the information recording method of the eighth embodiment of the present invention;

Fig. 12 shows the schematic diagram of the format adopted in the information recording method of the eleventh embodiment of the present invention;

Fig. 13 shows a schematic diagram of a format that can replace the recording format of Fig. 11 in the eleventh embodiment of the present invention; and

Fig. 14 is a diagram showing a format used in the information recording method of the twelfth embodiment of the present invention.

Detailed ways

A first embodiment of the present invention is described with reference to FIG. 1 . Fig. 1 is a recording format of recording information in the first embodiment of the present invention. This figure specifies the data arrangement of a correction block. In Figure 1, SYNC represents a synchronization signal that specifies the first position of the SYNC block, SA represents a sector address that specifies a value assigned to a sector, and additional data is appended to the main data to represent e.g. Information on the characteristics of the main data, "main data" is the main record information, C2 represents the second error correction code (hereinafter abbreviated as C2 code) added to the additional data and the main data, and C1 represents the second error correction code added to the additional data and the main data An error correction code (hereinafter abbreviated as C1 code). Divide the main data input in a timing sequence into 128 bytes (represented as 128B in Figure 1) units and add 2 bytes (2B) of additional data to each 128 byte unit, thus generating 128 rows (Figure 1 128 blocks in 1). A byte is collected at the same position in each row including 130 (128+2) byte data, and a 14-byte C2 code is generated to finally constitute a C2 correction block. The 14-byte C2 code is arranged along the direction indicated by the arrow 10 . As a result, the obtained C2 code constitutes 14 rows of 130 bytes (14 blocks in Fig. 1). Added to each of the 142 (128+14) rows of 130 bytes is an 8-byte C1 code to form a C1 correction block (indicated by arrow 102). Thus, for the additional data consisting of 128 rows x 2 bytes and the main data consisting of 128 rows x 128 bytes, 130 C2 blocks and 142 C1 blocks are generated. Further, 16 consecutive C1 correction blocks constitute one sector. Therefore, this sector includes 2048 (128*16) bytes of main data. Each sector of data to be recorded on the disk is designated with a unique numerical value (sector address). That is, a 3-byte sector address is added to each C1 correction block together with a synchronization signal SYNC to form a SYNC block. As described above, a correction block is constituted which can indeed realize C1 and C2 corrections within 128*128 byte units of main data. Data items are written on the media in order starting with the highest SYNC block and ending with the lowest SYNC block. As such, data is written within each SYNC block in the direction starting at the leftmost position.

According to the first embodiment, in the operation of reproducing the data stored in the target sector of the magnetic disk, it is only necessary to perform data reproduction on the correction block included in the corresponding sector. In this way, desired data within a sector can be decoded at high speed and converted into output data. However, since a sector address is added to each SYNC block, the target sector can be easily determined, and thus the data of the sector can be output at high speed. In addition, only subdividing data continuously input at one timing can form a C1 correction block with the order of data maintained. Therefore, when the data is corrected based on the C1 code at the reproduction stage to output the corrected data in the order of the processing, the final data is output in the same order as the input data recorded on the magnetic disk. Compared with C2 code data error correction, C1 code error correction can produce output data more quickly, thereby obtaining an advantageous effect: it is convenient to implement such special regeneration operations as variable speed data regeneration and reverse data regeneration. Incidentally, in the description of the first embodiment, additional data, C1 code, C2 code, sector address, and synchronization signal are all added to main data in this order. However, to obtain the above-mentioned beneficial effects, the order of operations can only be changed when the relationship between the corresponding codes and signals shown in FIG. 1 remains unchanged. Further, the C1 code is added to the additional data, but the C1 code is not provided to the sector address. As such, the same advantageous effects can be obtained regardless of the presence or absence of the C1 code for additional data and sector addresses. Furthermore, although the additional data is placed on the left side of the main data, the above-mentioned effect can be obtained even if the additional data is arranged in the middle or on the right. Similarly, to obtain the same beneficial effect, the C1 code located on the right side of the main data in the first embodiment can also be located at the middle point or on the right side of the main data. Each C1 correction block including C2 codes is located within the last 14 blocks of a correction block. However, to obtain the above effects, the C1 block can also be arranged in the middle or before the other 128 C1 correction blocks. In addition, the number of bytes, blocks and sectors in Fig. 1 can also be changed appropriately, and the same beneficial effect can also be obtained.

Referring next to FIG. 2, a second embodiment of the present invention will be described. FIG. 2 shows the layout of the correction block in FIG. 1 corresponding to one sector. In this figure, the contents of SYNC, SA, C1 and additional data are the same as those shown in FIG. 1, respectively. Further, it is assumed that the C2 code is also added as in FIG. 1 . Transport (TS) packets shown in this figure have a fixed length and include data items such as video signals represented in compressed form. In Fig. 2, main data includes a transport packet. In FIG. 1, the additional data in one sector (ie, 16 blocks) includes 32 bytes. In Fig. 2, the 12-byte area of 6 blocks is allocated as a common additional data area, and has no direct relationship with the input data. The remaining 10 blocks (ie, 20-byte area) are designated as an area for storing additional data or main data according to the input data. Specifically, when the main data is in the form of a transport packet, the main data is recorded therein. In other cases, additional data is additionally recorded.

As described above, according to the second embodiment, when the main data is in the form of transport packets, the area for recording the main data satisfies the expression (1) shown in FIG. recorded in this area. Furthermore, since the common additional data area is provided regardless of the format of the main data, data can be efficiently written on the recording medium regardless of whether the main data is in the form of a transport packet. However, in the case where the common additional data area of FIG. 2 is used to record a code indicating whether the main data is in the form of a transfer packet, the data can be accurately realized on the magnetic disk for the above two data forms. This advantage is obtained even when the data layout changes between disk sectors. Even if the numerical values shown in this embodiment are changed, the same advantages can be obtained as long as the condition of the expression (1) is satisfied.

Referring next to Fig. 3, a third embodiment of the present invention will be described. FIG. 3 shows the data layout of the correction block of FIG. 1 corresponding to the six SYNC blocks. In this figure, SYNC, SA, C1 and additional data are the same as those shown in FIG. 1 . In addition, it is assumed that the C2 code is also added as in Fig. 1 . Each transport packet of FIG. 3 is formed in the same manner as in FIG. 2 . When recording transport packets in this embodiment, m (m is a natural number; 2 in this example) transport packets are written in the main data area for every n (n is a natural number; 3 in this example) SYNC blocks , what is written into the remaining 8 byte areas in the main data area is meaningless dummy data. According to this embodiment, data can be efficiently written on the recording medium regardless of whether the main data is in the form of a transport packet. However, when the common additional data area of FIG. 2 is used to write a code indicating whether the main data is in the form of a transport packet, data reproduction can be properly performed regardless of the form of the data. Furthermore, although it is necessary to detect the timing of n SYNC blocks, timing information may be recorded instead of dummy data, or may be recorded as a sector address or part of additional data. As long as the expression (2) shown in Figure 3 is satisfied, the third

Example values.

Referring now to FIG. 4, a fourth embodiment of the present invention will be described. Except for S0 and S1, the components in Fig. 4 are the same as those in Fig. 3 . Reference symbols S0 and S1 in FIG. 4 denote synchronization signals having composition patterns different from each other. Signals S0 and S1 are applied to each SYNC block. The S0 composition pattern occurs for every n SYNC blocks. Therefore, decoding operations such as data correction and transport packet detection can be correctly performed.

Next, a fifth embodiment of the present invention will be described with reference to FIG. 5 . Figure 5 shows the SYNC and SA fields in Figure 1 in detail. Additional data, main data, C1 code, and C2 code are the same as those in FIG. 1 . SAu, SAm, and SA1 together represent a 3-byte sector address. That is, SAu, SAm, and SA1 refer to the highest address, middle address, and lowest address, respectively. The sector address is written eight times for each sector. Fig. 5 shows sector data from the nth sector to the n+7th sector. A value in parentheses appended to SA1 represents a sector address represented by SAu, SAm, and SA1. BA represents a number assigned to a SYNC block in the correction block. The relevant values in parentheses represent, as an example, a numerical value assigned to the unit of each two blocks, ie, an address of one block is assigned to each two blocks. If the sector address is an address other than any sector address assigned to the main data, the sector address attached to the SYNC block recording the C2 code can be assigned in an arbitrary manner. In Fig. 5, a special natural number K is assigned to each SYNC block including the C2 code. Further, instead of a block address, a code can be specified which can identify the first SYNC block of the modified block, or which can identify a sync signal having a special pattern unique to the first SYNC block. The parity code is associated with a group of SAu and BA or a group including SAm and SA1. S0 and S1 are sync signals representing the first position of each SYNC block. These signals have mutually different composition patterns, where S0 represents one recording cycle of sector addresses. A SYNC block including S0 is considered to include SAu and BA, and a SYNC block written to S1 is assumed to include SAm and SA1.

As described above, according to this embodiment, sector address information can be properly determined at high speed without decoding the C1 code, thereby increasing the data access speed. Although the sector address consists of three bytes and the block address (BA) has one byte and is written for every second block in this embodiment, the present invention is not limited to these values. Also, since the parity is also added to the block address, the accuracy of the block address location information is also improved. In addition, the accuracy of reading out the sector address and the accuracy of correcting data based on the C2 code can also be improved. Further, only data continuously input in one timing is subdivided to form a C1 block, and its input order remains unchanged. Therefore, during data reproduction, when the data is corrected based on the C1 code and then output in the order of processing, the order of recording input data is maintained in the data output operation. Due to this fact, in addition to the advantage that the sector address can be properly read out at high speed, data can be output at a higher speed than in the case where the C2 code is also used to correct the data. This results in an advantageous effect of facilitating reproduction of special data such as variable speed data reproduction and reverse data reproduction.

Next, a sixth embodiment of the present invention will be described with reference to FIG. 6 . This figure shows the SYNC and SA fields in Figure 1 in detail. Components other than S0, S1, SA, BA, and parity are the same as those in FIG. 5 . SA represents a sector address, and SA is written 16 times for each sector. FIG. 6 shows the data of the nth sector to the n+7th sector, where the value in parentheses appended to SA represents a sector address. BA represents a number assigned to a SYNC block within the correction block. The value in parentheses of BA represents the numerical value of a block address for each block as an example. If the sector address is an address other than the sector address of any main data, the sector address attached to the SYNC block in which the C2 code is recorded can be designated in an arbitrary manner. In Fig. 6, a special natural number K is assigned to each SYNC block including the C2 code. The parity code is associated with 3-byte SA and 1-byte BA. S0 and S1 are sync signals representing the first position of each SYNC block. These signals have mutually different composition patterns, in which S0 represents the first position of the correction block.

As described above, according to this embodiment, the sector address information can be determined accurately at high speed without decoding the C1 code, so the data access speed is increased. Thanks to the synchronization signal and the block address, the first position of the correction block can be detected more reliably. Although the sector address consists of three bytes and the block address (BA) has one byte in this embodiment, the present invention is not limited to these values. Also, since the first position of the correction block can be determined according to the type of the synchronization signal, similar advantages can be obtained even when the block address is lost. On the contrary, since the block address is provided, the first position of the correction block can be detected, and the same advantage can be obtained without distinguishing the synchronous signals S0 and S1. Furthermore, since parity is also provided to the block address, the accuracy of the position information indicated by the block address is improved. In addition, the accuracy of reading out the sector address and the accuracy of correcting data based on the C2 code can also be improved. Further, only data continuously input in one timing is subdivided to form a C1 block with the input order unchanged. Therefore, in data reproduction, when the data is corrected based on the C1 code and then output in the processing order, the input data recording order is maintained in the data output operation. Due to this fact, in addition to the advantage that sector addresses can be accurately read out at high speed, data can be output at a faster speed than in the case where the C2 code is also used to correct data. This results in an advantageous effect of facilitating reproduction of special data such as variable speed data reproduction and reverse data reproduction.

A seventh embodiment of the present invention will be described below with reference to FIG. 7 . Fig. 7 shows a data arrangement format of a correction block used in the recording method of the seventh embodiment. Since the difference between FIG. 7 and FIG. 1 is only the operation of adding C1 code and C2 code to data, the description of other components is omitted. Although the correction blocks C1 and C2 in FIG. 1 only include the data of one correction block, another method of composing data constituent items is now used. The data composition method will be described below. Use a delay P (P: is a natural number except 130 (bytes), 130 (bytes) is the total number of bytes of additional data and main data in one line) and additional data and main data formed in the same way as in Figure 1 data to form data, thereby forming a C2 correction block. Attached is a 14-byte C2 code. For example, the nth C2 correction block in the figure is represented by arrow 701 . And, when such an arrow is drawn from the left end to the bottom end instead of drawing to the right end, as shown in arrow 702 of FIG. That is, the data combining operations continue along arrows 702 and 703 to finally obtain a C2 correction block. Thereafter, an 8-byte C1 code is added to each row, resulting in a C1 correction block. Added to each C1 block in a similar manner to FIG. 1 is a sector address and a synchronization signal, thereby forming a correction block. Data items are written on the recording medium in the same manner as in FIG. 1 .

According to this embodiment, target sector data can be reproduced at a high speed at the same speed as that formed for the data arrangement of Fig. 1 . Furthermore, compared to the case of FIG. 1, the code redundancy of the seventh embodiment can be reduced by SYNC, SA, additional data, and C1 code of the SYNC block recording the C2 code. Furthermore, since only the data continuously input in one timing is subdivided to form a C1 block whose input order remains unchanged, when the data is corrected according to the C1 code during data reproduction and then output in the processing order, the data output The record order of the input data in the operation is maintained. Due to this, when compared with the case where the C2 code is also used to correct the data, in addition to the advantage that the sector address can be read accurately at high speed, the data output speed can also be accelerated. This produces an advantageous effect of facilitating the reproduction of special data such as variable speed data reproduction and reverse data reproduction. Incidentally, each of the embodiments shown in FIGS. 2 to 6 is also applicable to the seventh embodiment. Next, an eighth embodiment of the present invention will be described with reference to FIGS. 8 and 11 . Fig. 8 shows a flowchart of a method for reproducing data from a magnetic disk according to an eighth method, and Fig. 11 shows by way of example the format of the oblique data interleaving process used in the method. In FIG. 8, reference numeral 802 denotes a C1 error correction process, and 803 denotes a step of detecting header information attached to each block or group of blocks. Header information is recorded as, for example, partial additional data or sector addresses. In this case, the header information includes a code indicating a method of interleaving recorded information. Numeral 804 denotes a step of checking the header information to decide whether the interleaving type is the orthogonal block complete type or the oblique block incomplete type, the numeral 805 denotes the deinterleaving process of the oblique block incomplete type, and the numeral 807 denotes the deinterleaving process of the orthogonal block complete type , numerals 806 and 808 both denote C2 error correction steps for correcting errors based on the C2 code attached to the correlation data. Numeral 809 denotes a processing step of determining a data reproduction end. In the example of the orthogonal block complete type interleaving process, the C2 code is added to the data as shown in FIG. 1 . Fig. 11 shows an example of the oblique block incomplete type interleaving process. The only change in this figure relative to figure 7 lies in the arrangement of C2 correction blocks. As in Fig. 7, it is constituted in the same manner as in Fig. 7 with a delay P (P is a natural number except 130 (byte), and 130 (byte) is the total number of bytes of one line of additional data and main data) The appended data and the main data are combined to generate a C2 correction block. Thereafter, a 14-byte C2 code is added to the block. However, operations along the fold lines shown in Figure 7 are not employed. Consequently, the arrangement of Figure 11 differs from Figures 1 and 7 in that there are no such correction blocks terminating at blocks C1 and C2 respectively. Therefore, in order to decode the data of the desired sector, it is also necessary to reproduce the unnecessary output (data for C2 correction). However, the folding process of Fig. 7 is unnecessary. In the C2 correction steps 806 and 808, corrections have been effected for the data of the C2 block obtained by the de-interleaving processes 805 and 807, respectively. The C1 error correction loop, the deinterleaving loop and the C2 error correction loop are executed simultaneously or sequentially. In addition, although the C1 modification step 802 is basically common to both interleaving processes, when the number of bytes of block data varies, a conversion operation is implemented to transfer control to the relevant operation step.

According to the embodiment described above, even when the oblique block interleaving is not completely performed on the compressed video signal to be continuously reproduced, and the application data on the computer or the like is to be completed, the data can be accessed at a higher speed in sector units. The stored data can also be accurately reproduced during the complete interleaving process of the orthogonal blocks. In this regard, as described in connection with the eighth embodiment, it is not necessary to use the recording format of FIG. 11 in the orthogonal block full interleave operation. That is, according to the present invention, the recording format can only be effectively used as an independent unit. Further, this format can be effectively employed with each of the embodiments described with respect to FIGS. 2-6. That is, only the correction code of FIG. 11 is reproduced in FIGS. 2 to 6 . In addition, the oblique interleaving method of FIG. 13 may be employed instead of the method shown in FIG. 11 . Fig. 13 differs from Fig. 11 only in that the C1 code is included in the C2 correction block. And, according to the data reproducing method of the present embodiment, for either method in the two interleaving methods, when the data is corrected according to the C1 code and the data item order is not changed to output the data, the input data in the output operation order can be maintained. In addition to the advantageous effect that the sector address can be determined accurately at high speed, data can be output at a faster speed than the case where the C2 code is also used for data correction. This leads to the advantage of facilitating the reproduction of special data such as variable speed data reproduction and reverse data reproduction. The oblique interleave method of FIG. 13 can be partially changed so that input data is arranged in a timing sequence according to the arrangement order of C2 correction block rows. This improved method is also applicable to the eighth embodiment, although data reproduction with only C1 correction has no superior performance in this regard. And, when the above-mentioned method is used together with each of the embodiments corresponding to FIGS. The advantages of data recording efficiency in these areas.

Next, a ninth embodiment of the present invention will be described with reference to FIG. 9 . Fig. 9 shows a block diagram of a data reproducing apparatus in a ninth embodiment of the present invention. In the description of this embodiment, it is assumed that the orthogonal block complete interleave operation and the oblique block incomplete interleave operation are performed according to the data formats of FIG. 1 and FIG. 11 respectively. Reference numerals 901 to 903 denote input processing means, header readout means, and random access means, respectively. Numeral 904 denotes a device for generating write addresses for reproduced data, numeral 905 denotes a device for generating read and write addresses for C1 error correction, numeral 906 denotes a switching device, and numeral 907 denotes a device for generating and quadrature The device for reading and writing addresses of C2 error correction related to block complete type deinterleaving, numeral 908 represents the device for generating the reading and writing addresses of C2 error correction related to oblique block incomplete type deinterleaving, numeral 909 denotes error correction means for implementing C1 and C2 error correction, numeral 910 denotes means for generating read addresses of output data, and numeral 911 denotes output processing means. The input device 901 performs decoding and synchronous read operation on the input signal and writes the obtained input data in the RAM 903 . In this operation, a write address is generated by the address generating means 904 . Furthermore, the reading means 902 detects the header of the input data and selects the address generating means 907 or 908 according to the header information. The address generator 905 is used to read out the data in the RAM903 to the error correction device and write the data in the device 909 into the RAM903 respectively. Incidentally, since the C1 block structure is basically common to both types of interleaving methods, the addresses generated by the device 905 according to the relevant interleaving methods do not need to undergo translation operations. However, when the number of bytes is changed, a conversion operation is performed to transfer control to the related process. Both devices 907 and 908 control the sequence of data reading or writing so that device 909 can complete error correction in the C2 block unit shown in FIG. 1 or 11 , thereby completing corresponding deinterleaving operations. The conversion device 906 responds to the switching signal from the header reading means 902 to select 907 or 908 the generated address. After completing the C1 error correction, no matter what the operation mode is, the data should be read from the RAM 903 according to the read address from the device 911, that is, the data should be read in the order in which they were recorded on the disk. The resulting data is then transferred to output means 911 in sector units to thereby output the data.

According to the ninth embodiment, a data reproduction apparatus implementing the data reproduction method related to the eighth embodiment is realized.

A tenth embodiment of the present invention will be described below with reference to FIG. 10 . Fig. 10 is a flowchart showing a method of reproducing data from a magnetic disk in the tenth embodiment. FIG. 10 is different from FIG. 8 only in steps 1001 to 1003 related to the detection interleaving method, so only this part of the process will be described.

Reference numeral 1001 denotes a sector table readout process for reading out a correspondence table including correspondences between sector addresses and interleave patterns from a specific area of the magnetic disk. Numeral 1002 represents the step of detecting the sector address, and numeral 1003 is the step of selecting an interleaving method according to the table obtained in step 1001 and the sector address detected in step 1002. Other operation steps are basically the same as those in FIG. 8 .

According to the tenth embodiment, since the interleave pattern is recognizable in advance for each area in the magnetic disk, the advantageous effect of the operation of Fig. 8 can be easily obtained. An eleventh embodiment of the present invention will be described below with reference to FIG. 12 . Fig. 12 is a flowchart showing a method of recording data on a magnetic disk according to an eleventh embodiment of the present invention. In the description of this embodiment, the orthogonal block complete interleaving and oblique block incomplete interleaving of FIGS. 1 and 11 will be used as examples, respectively. In Fig. 12, reference numeral 1101 represents the step of selecting the complete interleaving of the orthogonal blocks or the complete interleaving of the oblique blocks, the numeral 1104 is the step of performing incomplete interleaving of the oblique blocks, and the numeral 1102 is the step of completing the complete interleaving of the orthogonal blocks. Numerals 1105 and 1103 represent steps of adding C2 codes to corresponding data, numeral 1106 represents a step of adding a title to data, and numeral 1107 represents a step of adding C1 codes to data. In step 1101, when the recorded data includes, for example, compressed video and audio signals, oblique blocks are selected to be incompletely interleaved; when the data is, for example, data stored on a computer or similar device, orthogonal blocks are selected to be fully interleaved. When it is assumed in step 110 that the oblique blocks are not completely interleaved, in step 1104 a C2 block is formed as shown in FIG. 11 . In step 1105, a data correction operation is performed on the obtained data, thereby completing incomplete oblique block interleaving on the input data. In step 1101, when the orthogonal block is fully interleaved, the C2 block shown in Figure 1 is formed in step 1102, and then the data correction is performed on the C2 block in step 1103, so that the orthogonal block is completely interleaved on the input data. staggered. In step 1106, a code indicating that the corresponding sector is related to oblique interleaving or orthogonal interleaving is added as a header. Step 1107 of adding C1 code is common to any data. However, in either of the two interleaving modes, when the number of bytes between C1 blocks changes, control is passed to an appropriate process. Incidentally, the operation cycle for increasing the C1 code and the operation cycle for increasing the C2 code are performed simultaneously or sequentially. In step 1106, when the title includes SA and no C2 code is added as shown in FIGS. 1 and 11, the operation as shown in FIG. 12 is performed. However, when the title is recorded together with the C2 code as additional data, the operation of step 1106 is performed immediately after step 1101 is performed.

According to the eleventh embodiment, it is possible to realize a disk data reproducing apparatus in which data in a target sector of a disk can be reproduced at high speed, and also compressed video signals and the like on the disk can be reproduced. Furthermore, it is possible to record data including only compressed video signals or the like on a magnetic disk so that the recorded signals can be reproduced by a device with a simple structure.

A twelfth embodiment of the present invention will be described below with reference to FIG. 14 . In the description, it is assumed, for example, that an input signal is constituted in a fixed-length transport packet, and an identification code indicating that the data is recorded by the method of FIG. 2, 3, or 4 is added to the data. Fig. 14 shows an identification code indicating that an input signal is in the shape of a transport packet and a sector address. In FIG. 14, the three bytes included in FIG. 5 and FIG. 6, that is, the 24-bit sector address is represented by 23 bits, and the highest bit is designated as an identification code. For example, when the identification code is set to eg 0, the input signal is in the form of a transmission packet, and when the identification code is eg 1, the input signal is in other forms. In this regard, the positions of the sector addresses shown in FIGS. 5 and 6 are used as the positions of the identification codes in the modification block.

According to the twelfth embodiment, the data reproducing apparatus can recognize the recording format based on the identification code, and thus can accurately reproduce the data on the magnetic disk. However, in this embodiment, although the identification code indicating whether the input signal is in the form of a transport packet is stored in the partial sector address area of FIG. 5, it is also possible to store the identification code in the section of FIGS. part of the block address field.

According to the present invention, the advantage obtained is that data can be easily retrieved in sector units and at the same time the operation of reproducing data can be performed at high speed in sector units. Since the sum of the main data of one sector having a capacity represented by a power of 2 and the additional data partially added to the sector is equal to the data capacity of a plurality of transport packets, users who can apply compressed video signals and data The data is effectively recorded on the disk, and at the same time, the invalid and unused area in the recording area of the disk is reduced. Further, when the output data is generated only by performing the C1 correction, the data can be output in the same order as the data input, which facilitates the reproduction operation of special data.

In addition, the medium for recording data according to the present invention includes, of course, optical disks, magnetic disks, and optical-magnetic disks, and its external shape is not limited to a disk shape. Further, it is not necessary to continuously record data on the medium.

While the present invention has been described with reference to specific illustrative embodiments, the invention is not limited to these embodiments but only by the appended claims. Apparently, those skilled in the art can make changes or modifications to the embodiments without departing from the scope and concept of the present invention.

Claims (2)

1. one kind is used for by the reclaim equiment at a signal of the information recording carrier of sector record data regeneration, each sector comprises a plurality of synchronization blocks, each synchronization blocks comprises a synchronizing signal, and in a synchronization blocks, store a sign indicating number that is used to discern described sector in each sector, the synchronizing signal that is different from all synchronization blocks in this sectors of other described primary importances that do not comprise the described sign indicating number that is used to discern this sector comprising the synchronizing signal of a certain synchronization piece of the primary importance of the described sign indicating number that is used to discern this sector, and comprise the sign indicating number that is used for discerning a sector described primary importance synchronization blocks synchronizing signal with comprise be used to discern another sector yard the synchronizing signal of synchronization blocks of described another sector of primary importance identical, described equipment comprises:

According to the difference between the synchronizing signal of the synchronizing signal of the certain synchronization piece of the described primary importance that comprises the described sign indicating number that is used for discerning described sector and all other synchronization blocks of described sector of the described primary importance that does not comprise the described sign indicating number that is used to discern this sector detect be used to discern described sector yard the device of primary importance;

Information according to detected described position detects described yard the device that is used to discern the sector;

Discern and export the device of desired data according to the described sign indicating number that is used to discern the sector.

2. according to the reclaim equiment of claim 1, it is characterized in that the code length that is recorded in the synchronizing signal of all synchronization blocks on the recording medium is equal to each other.

Images