CN1996480B - Multi-level run length data conversion method and device, and Blu-ray multi-level optical storage device - Google Patents

Abstract

The present invention provides a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the method includes the following steps: a modulation step and or a demodulation step Step, wherein, the run-length limited coding that adopts is the 4 yuan (d, k) sign indicating number of code rate R=5/8 bit/symbol element, is used for converting the 5-bit source word that the decimal system user data is formed into 8 A code word composed of multi-order symbols or a code word composed of 8 multi-order symbols is converted into a 5-bit source word composed of decimal user data, wherein the code elements include '0', '1', '2 ', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 is equal to 10, indicating that the maximum number of consecutive identical symbols is 10. The present invention also provides a multi-level run length data conversion device, and a Blu-ray multi-level optical storage device using the above method or device.

Description

Multi-level run length data conversion method and device, and Blu-ray multi-level optical storage device

technical field

The present invention relates to high-density digital storage technology, and more specifically, to a multi-level run length data conversion method and device for a Blu-ray multi-level optical storage device, and to a Blu-ray system using the above-mentioned multi-level run length data conversion method and device. Multi-stage optical storage device (such as Blu-ray multi-stage read-only disc).

Background technique

Conventional optical discs all use a run length (referred to as run length) limited encoding scheme, that is, RLL (Run Length Limited, run length limited) encoding. RLL means that the channel sequence stored on the optical disc satisfies the following conditions: there are at least d '0's and at most k '0's between two '1's in the sequence. The two parameters d and k specify the minimum and maximum run lengths that may appear in the sequence, respectively. The parameter d controls the maximum transmission frequency and thus may affect the intersymbol interference when the sequence is transmitted over a band-limited channel. In binary data transmission, it is usually desirable that the received signal is self-synchronizing. Synchronization is usually reproduced using a phase-locked loop. The phase-locked loop adjusts the phase at the detection moment according to the jump of the received waveform. The maximum run length parameter k ensures an appropriate hopping frequency to meet the need for read clock synchronization. In an optical storage system, the parameter d usually takes 1 or 2, and the value of k takes about 10, and the smaller the parameter k, the better the clock recovery is. With RLL encoding, information exceeding 1 bit can be stored on a minimum record, so RLL encoding has been widely used in optical storage. Such as EFM coding for CD (d=2, k=10) and EFM+ coding for DVD (d=2, k=10). Due to the use of RLL encoding, DVD has obtained a storage density of 1.5 (bit/minimum record character).

In addition, in the optical storage system, in order to prevent or reduce the interaction between the low-frequency components of the read signal and the tracking servo signal, the modulation code is also required to suppress the low-frequency components of the encoded sequence, that is, to have a DC balance characteristic. The use of DC balanced codes also helps to eliminate the influence of low-frequency interference caused by fingerprints on the readout signal. Run-length limited codes with DC balanced properties are called DC-balanced run-length limited codes.

In the read-only (ROM) optical disc produced by DC balanced run-length limited codes, there are only two types of information symbols, pits and lands, and the pits and lands are arranged at intervals along the spiral at the center of the disc, and the length of pits and lands (Run length) is one of (d+1)T, (d+2)T, ..., (k+1)T. This kind of disc can be easily and accurately copied and produced. The current CD/DVD and future Blu-ray discs all use this technology.

For the new multi-stage optical storage technology, people also hope to use RLL modulation technology to record information, so an M (M>=2) element RLL code suitable for multi-stage systems is produced. Obviously, the traditional RLL code is M=2 RLL code. Patent WO 96/36122 proposes a set of methods for converting binary input data into multi-order channel symbols satisfying RLL constraints, and patent WO 96/36115-36129 provides specific embodiments of various parameters. However, in the multi-level read-only (ROM) optical discs produced by the method described in the above patent documents, there are M types of record characters, one of which is the same bank as the traditional optical disc, and the other M-1 types are the same banks. There are different record pits, and these record pits that are different from each other will appear continuously. Assuming that A and B are two different pits, then there will be a situation where pit A is connected to pit B in the optical disc, but in traditional optical discs, there must be a land after the pit, and there must be a pit after the land, there is no pit and pit connected situation. Such a surface structure connecting different pits makes the duplication and production of this type of read-only optical disc very difficult, mainly due to the inability to accurately control the physical shape of the joints, which increases the bit error rate when the optical disc is read. In addition, the multi-order RLL code scheme in the above patent documents does not solve the problem of controlling the DC component of the modulated channel sequence. Therefore, in the actual optical disc reading process, it is easy for the optical disc to fail to servo correctly, resulting in a high error rate or even failure to read the disc. The situation of disk reading.

Based on the above reasons, the present invention provides a novel multi-stage data encoding method and device, and provides a corresponding demodulation method and device at the same time. The new multi-level data encoding method and device proposed by the present invention can produce a new type of multi-level optical disc in which different recording pits are separated by land, that is, it has a physical structure similar to that of traditional optical discs, thereby reducing the cost of optical disc duplication and production. difficulty. In addition, the multi-order data encoding method and device provided by the present invention can also suppress the DC component of the modulated multi-order channel sequence in the low frequency band, and can better meet the requirements of the actual optical disc system.

Contents of the invention

In order to overcome at least one defect in the above-mentioned prior art, the object of the present invention is to provide a multi-level run length data conversion method and device for a Blu-ray multi-level optical storage device, and a Blu-ray multi-level optical storage device using the method or device. A storage device such as a Blu-ray multi-level read-only disc is beneficial to disc duplication and production, and at the same time can control the data encoding method and device of the low-frequency component of the encoded channel sequence, and the demodulation method and device.

According to one aspect of the present invention, there is provided a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, including a modulation step: using a run-based The encoding table of the length-limited encoding and the state information of the encoder transform the input source word into a code word, and burn the code word into a Blu-ray multi-level optical storage device by laser to form a multi-level code element sequence; wherein, the run length is limited The encoding is a 4-element (d, k) code of code rate R=5/8 bit/symbol element, which is used to transform the 5-bit source word formed by the decimal system user data into a code word composed of 8 multi-order symbols, Among them, the symbol includes '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 is equal to 10, which means that consecutive identical symbols The maximum number of is 10.

In the above multi-stage run length data conversion method, the encoding table is divided into 6 sub-tables, corresponding to the 6 states of the encoder: state 1, state 2, state 3, state 4, state 5, state 6, each The subtable corresponding to the encoder state contains 32 codewords composed of 8 multi-order symbols, and the next state of the encoder corresponding to these codewords, and the subtable corresponding to the next state uses For the encoding of the next source word, the sets in the respective sub-tables are mutually disjoint.

In the above-mentioned multi-order run-length data conversion method, the modulating step comprises the following steps: Step (1): the code table is input in the memory of the main code table converter; Step (2): the main code table converter The status register initializes the current state S to be state 1, or state 5, or state 6; the value CRDS of the current run-length digital sum formed by the codeword after each multi-order channel sequence code conversion is initialized to 0, and i=1, i Indicate the serial number of the multi-order channel sequence; step (3): input the user data into the source word generator and sequentially generate the code word combination of the multi-order channel sequence: step (4): save the current state S of the encoder and the current run number and the value; Step (5): the source word generator imports new block T _i to the memory in the main code table converter, and this memory codes the codeword combination in the new block T _i : step (6): If i<2 ^b , then command i=i+1, the state information stored in the state register is the state S saved in step (4), the current run length number and CRDS of the encoder are the CRDS saved in step (4), And repeat step (5) until i = 2 ^b ; step (7): According to the stored values of 2 ^b ERDS, the DC controller selects the ERDS(j) with the smallest absolute value, j∈{1, 2,...,2 ^b } corresponds to the multi-order channel symbol sequence Ch _j as the conversion result after encoding the current block S, and at the same time make the state of the encoder S=NS(j), the current run length sum CRDS=ERDS (j); step (8): if the encoding is finished, then terminate; otherwise, go to step (3).

In the above-mentioned multi-stage run-length data conversion method, step (3) comprises the following steps: step (3.1): the source word generator divides the user data of input into the block S that length is a bit; Step (3.2): source The word generator adds b binary numbers at the beginning of the block S in step (3.1) to obtain a new block with a length of a+b bits, there are 2 ^b in total, and the value of b must satisfy that (a+b)/m is an integer, m=5 is the length of each source word, so that each new block contains (a+b)/m source words; the new block is represented by {T ₁ , T ₂ ,..., T _2b }, corresponding The multi-level channel sequence of is denoted by {X _i }, i=1, 2, ..., 2 ^b , and the symbol x _i ∈ {0, 1, 2, 3} of each multi-level channel sequence.

In the above-mentioned multi-stage run-length data conversion method, step (5) comprises the following steps: Step (5.1): the memory is based on the first m source word of the block T _i and the state information S(t inputted from the state register _i ) select the corresponding sub-table in the encoding/decoding table to obtain a group of codewords CW of n=8 multi-order symbols, and send the corresponding state information NS corresponding to the first m-bit source word in the corresponding sub-table into the state register, to be used for converting the next m source word in the new block T _i ; step (5.2): repeat the process of source word and code word conversion in the step (5.1), until finishing the encoding of T _i ; Step (5.3): the length obtained by the memory is e=(a+b)×n/m multi-level symbol sequence Ch _i , the run-length number and ERDS(i)=CRDS, and the next state NS when the encoding ends (i) sent to and stored in a storage unit of a DC controller, wherein, ERDS(i) is the current accumulated run-length digital sum of the encoder, and this value follows the encoding process of each source word in each multi-level channel sequence ongoing and constantly changing.

According to another aspect of the present invention, there is provided a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, including a demodulation step: The multi-level symbol sequence read from the Blu-ray multi-level optical storage device is divided into code words, and the code words are converted into source word output by using the decoding table based on the run length limited encoding and the decoder state information; where the run length Restricted coding is a 4-element (d, k) code with code rate R = 5/8 bits/symbol, which is used to transform a code word composed of 8 multi-order symbols into a 5-bit source composed of decimal user data word, wherein, the symbol includes '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 is equal to 10, which means that the consecutive identical symbols The maximum number of symbols is 10.

In the above multi-level run length data conversion method, the decoding table is divided into 6 sub-tables, corresponding to the 6 states of the decoder: state 1, state 2, state 3, state 4, state 5, state 6, respectively corresponding to For 6 decoder states, the sub-table corresponding to each decoder state contains 32 codewords composed of 8 multi-level symbols, and the next state of the encoder corresponding to these codewords, and, The sub-table corresponding to the next state is used for decoding the next source word, and the sets in each sub-table are mutually disjoint.

In the above-mentioned multi-stage run-length data conversion method, the demodulation step includes the following steps: Step (1): Input the code word based on the run-length limited encoding into the memory of the decoding table converter and the memory of the state discriminator respectively ,; step (2): input the multi-order code element sequence to be decoded into the code word divider to obtain a code word combination composed of 8 multi-order code elements; step (3): send the current code word CW into the decoding Table converter; step (4): the current code word CW and the next code word following it are sent to the state discriminator; step (5): the state discriminator outputs the state S of the current code word CW, and the next The state NS corresponding to the sub-decoding table of the code word NCW; step (6): after the DC controller receives the S, NS and the code word CW from the code word segmentation of the step (5), it judges according to the decoding table Whether the next state of the current codeword CW is the selected NS in step (5), if so, output the source word corresponding to the codeword CW, otherwise, output the information that cannot be decoded.

According to another aspect of the present invention, there is provided a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the method includes the above modulation steps and the above demodulation steps.

According to another aspect of the present invention, a multi-level run length data conversion device for a Blu-ray multi-level optical storage device is provided, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the device includes a multi-level run length A length-constrained encoding device comprising: a source word generator, a device for extracting a bit from input data and obtaining 2 ^b new data blocks of length a+b by adding b bit data; main code table converter , used to store the encoding/decoding table based on the run-length limited encoding, and convert the data source word into the encoding/decoding table conversion circuit of the channel code word by referring to the encoding/decoding table and state information, and the DC controller, using According to the run-length digital sum of the channel sequence obtained after encoding each new data block, the final encoding output result is determined; wherein, the run-length limited encoding is a 4-element (d , k) code, which is used to transform the 5-bit source word composed of decimal user data into a code word composed of 8 multi-order symbols, wherein the symbols include '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 equals 10, which means that the maximum number of consecutive identical symbols is 10.

In the above-mentioned multi-stage run length data conversion device, the coding table is divided into 6 sub-tables, corresponding to the 6 states of the encoder respectively: state 1, state 2, state 3, state 4, state 5, state 6, each The subtable corresponding to the encoder state contains 32 codewords composed of 8 multi-order symbols, and the next state of the encoder corresponding to these codewords, and the subtable corresponding to the next state uses For the encoding of the next source word, the sets in each sub-table are mutually disjoint.

According to another aspect of the present invention, a multi-level run length data conversion device for a Blu-ray multi-level optical storage device is provided, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the device includes a multi-level run length A length-limited decoding device, which includes: a state discrimination circuit, which is used to determine the state it belongs to in the encoding/decoding table according to the information of the channel code word formed by 8 multi-order symbols; and a decoding table conversion circuit, which stores There is an encoding/decoding table based on run-length limited encoding, which is used to automatically select a sub-table for demodulating the current codeword according to the status information of the current and immediately following codewords. The channel code word is converted into 5 data source words; Wherein, run-length-limited code is the 4 yuan (d, k) yard of code rate R=5/8 bit/symbol element, is used for forming 8 multi-order code elements The code word of is converted into a 5-bit source word composed of decimal user data, wherein the symbol includes '0', '1', '2', and '3', and d+1=3 represents the continuous same symbol The minimum number is 3, and k+1 is equal to 10, indicating that the maximum number of consecutive identical symbols is 10.

In the above-mentioned multi-level run length data conversion device, the decoding table is divided into 6 sub-tables, corresponding to the 6 states of the decoder: state 1, state 2, state 3, state 4, state 5, and state 6, respectively corresponding to For 6 decoder states, the sub-table corresponding to each decoder state contains 32 codewords composed of 8 multi-level symbols, and the next state of the encoder corresponding to these codewords, and, The sub-table corresponding to the next state is used for decoding the next source word, and the sets in each sub-table are mutually disjoint.

According to another aspect of the present invention, there is provided a multi-level run length data conversion device for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the device includes the above-mentioned multiple A first-order run-length limited encoding device and the above-mentioned multi-order run-length limited decoding device.

According to another aspect of the present invention, a Blu-ray multi-level optical storage device is provided, which has recording pits formed by laser inscription, and the recording pits correspond to stored data modulated by the above-mentioned run-length limited encoding.

To sum up, the present invention proposes a data encoding method, device, and demodulator for a Blu-ray multi-stage optical storage device (for example, a red-ray ROM disc), which is beneficial to disc duplication and production, and at the same time can control the low-frequency components of the encoded channel sequence. Methods and devices. The new multi-level data encoding method and device proposed by the present invention can produce a new type of multi-level optical disc in which different recording pits are separated by land, that is, it has a physical structure similar to that of traditional optical discs, thereby reducing the cost of optical disc duplication and production. difficulty. In addition, the multi-order data encoding method and device provided by the present invention can also suppress the DC component of the modulated multi-order channel sequence in the low frequency band, and can better meet the requirements of the actual optical disk system servo circuit. On the other hand, the decoding process of this code is also very simple, and it can be processed in units of codewords, and since only the next codeword needs to be referred to during decoding, a circuit structure with minimal propagation of decoding errors can be realized. In addition, the optical storage system using the 4-element (2,9) RLL code proposed by the present invention has the characteristics of significantly improving the storage capacity and data transmission rate of the storage system without changing the laser wavelength and optical numerical aperture, and is compatible with Current optical storage systems maintain maximum compatibility.

Description of drawings

In order to clarify the above-mentioned and other objects, features and advantages of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the accompanying drawings:

Fig. 1 shows the block circuit diagram of the encoding device for this 4 yuan (2,9) RLL code according to the embodiment of the present invention;

Fig. 2 shows the flow chart of the encoding method of the 4 yuan (2,9) RLL code according to the embodiment of the present invention;

Fig. 3 shows the flow chart of the demodulation steps of the 4-yuan (2,9) RLL code according to an embodiment of the present invention;

FIG. 4 shows a circuit block diagram of a decoding device for the quaternary (2,9) RLL code according to an embodiment of the present invention.

Detailed ways

In order to clarify the above and other objects, features and advantages of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

According to one aspect of the present invention, there is provided a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the method includes a modulation step: using Based on the encoding table of the run-length limited encoding and the state information of the encoder, the input source word is converted into a code word, and the code word is recorded into the Blu-ray multi-level optical storage device by laser to form a multi-level code element sequence;

Wherein, the run-length limited code is a 4-element (d, k) code with code rate R=5/8 bits/symbol, which is used to transform the 5-bit source word composed of decimal user data into 8 multi-order codes A code word composed of elements, wherein, the symbol includes '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 is equal to 10 , indicating that the maximum number of consecutive identical symbols is 10.

In the above multi-stage run length data conversion method, the encoding table is divided into 6 sub-tables, corresponding to the 6 states of the encoder: state 1, state 2, state 3, state 4, state 5, state 6, each The subtable corresponding to the encoder state contains 32 codewords composed of 8 multi-order symbols, and the next state of the encoder corresponding to these codewords, and the subtable corresponding to the next state uses For the encoding of the next source word, the sets in each sub-table are mutually disjoint.

The present invention also provides a multi-level run length data conversion method for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, including a demodulation step: The multi-level symbol sequence read out from the storage device is divided into codewords, and the codewords are converted into source words for output by using the decoding table based on run-length limited encoding and decoder state information; wherein, the run-length limited encoding is a code A 4-element (d, k) code with a rate R=5/8 bits/symbol is used to convert a code word composed of 8 multi-order symbols into a 5-bit source word composed of decimal user data, wherein the code Elements include '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 is equal to 10, representing the maximum number of consecutive identical symbols The number is 10.

In the above multi-level run length data conversion method, the decoding table is divided into 6 sub-tables, corresponding to the 6 states of the decoder: state 1, state 2, state 3, state 4, state 5, state 6, respectively corresponding to For 6 decoder states, the sub-table corresponding to each decoder state contains 32 codewords composed of 8 multi-level symbols, and the next state of the encoder corresponding to these codewords, and, The sub-table corresponding to the next state is used for decoding the next source word, and the sets in each sub-table are mutually disjoint.

Apparently, the multi-order run length data conversion method according to the present invention may include the above-mentioned modulation step and demodulation step at the same time.

Table 1 shows an encoding/decoding table of a quaternary (2, 9) RLL code designed according to the embodiment of the encoding and modulation method of the present invention for converting input binary user data into new multi-level data. Table 1 is as follows:

5 bit source word state 1 State 2 state 3 State 4 State 5 State 6 CW NS CW NS CW NS CW NS CW NS CW NS 00000 00011111 1 00111000 3 01111111 1 03333333 1 11111110 2 33333300 1 00001 00022222 1 00111000 4 02222222 1 03333000 1 11111110 1 33333300 2 00010 00033333 1 00111000 5 01111110 1 03333000 2 22222220 1 33333300 3 00011 00001111 1 00111000 6 01111110 2 03333000 3 22222220 2 33333300 4 00100 00002222 1 00333000 3 02222220 1 03333000 4 33333330 1 22200000 1 00101 00003333 1 00333000 4 02222220 2 03333000 5 33333330 2 22200000 2 00110 00000111 1 00333000 5 03333330 1 03333000 6 11111100 1 22200000 3 00111 00000222 1 00333000 6 03333330 2 00333333 1 11111100 2 22200000 4 01000 00000333 1 00111100 3 01111100 1 01110000 1 22222000 1 22200000 5 01001 00011110 1 00111100 4 01111100 2 01110000 2 22222000 2 22200000 6 01010 00022220 1 00222200 3 03333300 1 01110000 3 22222200 1 33330000 1

5 bit source word state 1 State 2 state 3 State 4 State 5 State 6 CW NS CW NS CW NS CW NS CW NS CW NS 01011 00033330 1 00222200 4 01111000 1 01110000 4 22222200 2 33330000 2 01100 00001110 1 00333300 4 02222200 1 01110000 5 33333000 1 33330000 3 01101 00002220 1 00333300 3 02222200 2 01110000 6 33333000 2 33330000 4 01110 00003330 1 00333000 2 02222000 1 00222000 1 11111000 1 33330000 5 01111 00011100 1 00111100 2 03333300 2 00222000 2 11111000 2 33330000 6 10000 00011110 2 00222200 1 03333300 3 00222000 3 11111000 3 22220000 4 10001 00022220 2 00222200 2 03333300 4 00222000 4 11111000 4 22220000 3 10010 00033330 2 00111000 1 01111100 3 00222000 5 11111000 5 22220000 2 10011 00001110 2 00333000 1 01111100 4 00222000 6 11111000 6 22220000 1 10100 00002220 2 00111100 1 02222200 3 03330000 1 11111100 3 22220000 5 10101 00011100 2 00111000 2 02222200 4 03330000 2 11111100 4 22220000 6

5 bit source word state 1 State 2 state 3 State 4 State 5 State 6 CW NS CW NS CW NS CW NS CW NS CW NS 10110 00011100 3 00333300 2 01111000 3 03330000 3 22222000 3 11110000 1 10111 00011100 4 00333300 1 01111000 4 03330000 4 22222000 4 11110000 2 11000 00022200 1 00111110 2 01111000 5 03330000 5 22222000 5 11110000 3 11001 00022200 2 00111110 1 01111000 6 03330000 6 22222000 6 11110000 4 11010 00022200 3 00222220 1 01111000 2 02220000 1 22222200 3 11110000 5 11011 00022200 4 00222220 2 02222000 2 02220000 2 22222200 4 11110000 6 11100 00033300 1 00333330 2 02222000 3 02220000 3 33333000 3 33300000 6 11101 00033300 2 00333330 1 02222000 4 02220000 4 33333000 4 33300000 5 11110 00033300 3 00111111 1 02222000 5 02220000 5 33333000 5 33300000 4 11111 00033300 4 00222222 1 02222000 6 02220000 6 33333000 6 33300000 3

The encoding/decoding table contains 6 sub-tables, corresponding to 6 encoder states. In the encoding/decoding table shown in Table 1, different codewords composed of 8 multi-level symbols {0, 1, 2, 3} belong to the code tables corresponding to 6 states, and the 6 states are respectively state 1, state 2, state 3, state 4, state 5 and state 3, the corresponding code tables are sub-table 1, sub-table 2, sub-table 3, sub-table 4, sub-table 5 and sub-table 6.

In the encoding/decoding table shown in Table 1, the source words composed of 5-bit binary numbers are represented by their corresponding binary forms. In the encoding/decoding table shown in Table 1, each source word has a 'next state' corresponding to it in the 6 sub-tables, and the value of 'next state' defines the source word after the encoder converts the source word. The state that should be entered afterwards. The encoder selects the subtable corresponding to the state for encoding according to the current state. After the code conversion is completed, it will automatically enter the next state and select the corresponding subtable for the encoding of the next source word. Repeat the above process until End of encoding. Using the 4-element (2,9) RLL code modulation of the present invention, the source word of 5 bits can be converted into a code word composed of 8 multi-order symbols, and its code rate R=5/8 (bit/symbol).

Preferably, the modulation step of the present invention may contain the following steps:

Step (1): a kind of coding table based on run-length limited coding is input in the memory of main coding table converter, and this run-length limited coding is a kind of code rate R=5/8 bit/symbol 4 Element (d, k) sign indicating number, in order to code the source word that 5 binary numbers are formed into the code word that 8 multi-order code elements are formed, and described multi-order code element belongs to set {0,1,2,3}; The d=2 indicates that the number of symbol '0' between two non-zero symbols is at least 2, and k=9 indicates that the number of symbol '0' between two non-zero symbols is at most 9; The encoding table is divided into 6 sub-tables, corresponding to the states of 6 encoders respectively, and the sub-table corresponding to each encoder state contains 32 codewords composed of 8 multi-order symbols, and these codewords The next state of the corresponding encoder, and the sets in each subtable are disjoint; the "next state" refers to the new state that the encoder should enter after converting the source word, and select the The subtable corresponding to the entered state is used for the encoding of the next source word;

Step (2): initialize the current state S of the state register in the main code table converter to be the state 1, or state 5, or state 6; convert each multi-order channel sequence code to be formed by codewords The value CRDS of the current run-length digital sum is initialized to 0, and i=1, where i represents the serial number of the multi-stage channel sequence;

Step (3): Input the user data into the source word generator and follow the steps below to generate the codeword combination of the multi-order channel sequence:

Step (3.1): the source word generator divides the input user data into blocks S whose length is a bit;

Step (3.2): The source word generator adds b binary numbers at the beginning of the block S described in step (3.1) to obtain a new block with a length of a+b bits. There are 2 ^b in total, and the value of b will satisfy (a +b)/m is an integer, m=5 is the length of each source word, so that each new block contains (a+b)/m source words; the new block uses {T ₁ , T ₂ ,. .., T _2b }, the corresponding multi-order channel sequence is represented by {X _i }, i=1, 2, ..., 2 ^b , the symbol x _i ∈ {0 of each multi-order channel sequence, 1,2,3};

Step (4): save the value of the state S of the current encoder and the digital sum of the current run length;

Step (5): source word generator imports new block T _i to the storage device described in the main code table converter, and this storage device encodes the codeword combination in the new block T _i in the following steps:

Step (5.1): the memory selects the corresponding sub-table in the encoding/decoding table according to the first m-bit source word of the block T _i and the input state information S(t _i ) from the state register, and obtains n= 8 code words CW of one group of multi-order symbol elements, the state information NS corresponding to the first m source word in the corresponding sub-table is sent into the state register simultaneously, to be used for in the new block T _i The next m-bit source word is converted;

Step (5.2): repeat the process of source word and code word conversion in step (5.1), until finishing the coding to _T ;

Step (5.3): memory is with the length bit e=(a+b)*n/m multistage symbol sequence Ch _i that obtains, the run-length number and ERDS(i)=CRDS and next state NS( i) Send and save in a storage unit of a DC controller, wherein, ERDS(i) is the current accumulated run-length digital sum of the encoder, and this value follows the encoding process of each source word in each multi-level channel sequence and constantly changing;

Step (6): If i<2 ^b , then command i=i+1, let the state information stored in the state register be the state S saved in step (4), and the current run length and CRDS of the encoder be the state S saved in step (4) The preserved CRDS, and repeat step (5), until i=2 ^b ;

Step (7): The DC controller selects the ERDS(j) with the smallest absolute value according to the stored 2 ^b ERDS values, and the number corresponding to j ∈ {1, 2, ..., 2 ^b } Order channel symbol sequence Ch _j as the conversion result after current block S encoding makes the state S=NS (j) of coder simultaneously, current run length figure sum CRDS=ERDS (j);

Step (8): If the encoding is finished, stop; otherwise, go to step (3).

Preferably, the demodulation step of the present invention is characterized in that: the method contains the following steps in sequence:

Step (3.1): input the code word based on run-length limited encoding into the memory of decoding table converter and the memory of state discriminator respectively, this run-length limited decoding is a kind of code rate R=5/8 bit/ The 4-element (d, k) code of the code element decodes the code word composed of 8 multi-order code elements into a source word composed of 5 binary user data at the same time, and the multi-order code element belongs to the set {0, 1, 2 , 3}, said d=2 represents that the number of symbol '0' between two non-zero symbols is at least 2, and k=9 represents the number of symbol '0' between two non-zero symbols There are at most 9; the encoding/decoding table is divided into 6 sub-tables, corresponding to the states of 6 encoders respectively, and the sub-table corresponding to each encoder state contains 32 codes composed of 8 multi-order symbols words, and the next state of the encoder corresponding to these codewords, and the sets in each sub-table are disjoint; the "next state" refers to the coder should enter after converting the source word New state, and select the subtable corresponding to the entered state to be used for the encoding of the next source word;

Step (3.2): the multi-order code element sequence to be decoded is input to the codeword divider to obtain a codeword combination composed of 8 multi-order code elements;

Step (3.3): send the current code word CW into the decoding table converter;

Step (3.4): send the current code word CW and the next code word following it into the state discriminator;

Step (3.5): the state discriminator outputs the state S of the current codeword CW, and the state NS corresponding to the sub-decoding table of the next codeword NCW;

Step (3.6): after the DC controller receives the code word CW that S, NS that step (3.5) went out and the code word segmentation that goes out, judge whether the next state of current code word CW is step (3.5) according to decoding table ) in the selected NS, if so, output the source word corresponding to the code word CW, otherwise, output the information that cannot be decoded.

The present invention also provides a multi-level run length data conversion device for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the device includes a multi-level run length limited encoding device , which includes: a source word generator, which is used to extract a bit from the input data and obtain 2 ^b new data blocks with a length of a+b by adding b bit data; a main code table converter, used to store data based on Encoding/decoding table for run-length limited encoding, and by referring to encoding/decoding table and state information, converting data source word into encoding/decoding table conversion circuit of channel codeword, and DC controller, used for each The run-length digital sum of the channel sequence obtained after the encoding of the new data block determines the final encoding output result; wherein, the run-length-limited encoding is a 4-element (d, k) code of code rate R=5/8 bits/symbol, It is used to transform the 5-bit source word composed of decimal user data into a code word composed of 8 multi-order symbols, where the symbols include '0', '1', '2', and '3', d +1=3 means that the minimum number of consecutive identical symbols is 3, and k+1 equals 10, which means that the maximum number of consecutive identical symbols is 10.

In the above-mentioned multi-stage run length data conversion device, the coding table is divided into 6 sub-tables, corresponding to the 6 states of the encoder respectively: state 1, state 2, state 3, state 4, state 5, state 6, each The subtable corresponding to the encoder state contains 32 codewords composed of 8 multi-order symbols, and the next state of the encoder corresponding to these codewords, and the subtable corresponding to the next state uses For the encoding of the next source word, the sets in each sub-table are mutually disjoint.

The present invention also provides a multi-level run length data conversion device for a Blu-ray multi-level optical storage device, wherein the track pitch of the Blu-ray multi-level optical storage device is less than 0.52 microns, and the device includes a multi-level run length limited decoding device , which includes: a state identification circuit, which is used to determine the state of the channel code word formed by 8 multi-order symbols according to the information of the channel codeword in the encoding/decoding table; Encoding/decoding table with limited encoding, which is used to automatically select a sub-table for demodulating the current codeword according to the status information of the current and immediately following codewords, and convert the channel codeword composed of 8 multi-order symbols into 5 data source words; Wherein, run-length-limited encoding is 4 yuan (d, k) sign indicating number of code rate R=5/8 bit/symbol element, is used for the code word that 8 multi-order symbols form is transformed into A 5-bit source word composed of decimal user data, where the symbols include '0', '1', '2', and '3', d+1=3 means that the minimum number of consecutive identical symbols is 3 , k+1 is equal to 10, indicating that the maximum number of consecutive identical symbols is 10.

In the above-mentioned multi-level run length data conversion device, the decoding table is divided into 6 sub-tables, corresponding to the 6 states of the decoder: state 1, state 2, state 3, state 4, state 5, and state 6, respectively corresponding to For 6 decoder states, the sub-table corresponding to each decoder state contains 32 codewords composed of 8 multi-level symbols, and the next state of the encoder corresponding to these codewords, and, The sub-table corresponding to the next state is used for decoding the next source word, and the sets in each sub-table are mutually disjoint.

According to the above description, it is obvious that the multi-level run-length data conversion device according to the present invention can also include the above-mentioned multi-level run-length limited encoding device and multi-level run-length limited decoding device at the same time

FIG. 1 shows a circuit block diagram of an encoding device for the quaternary (2,9) RLL code proposed according to the present invention. The source word generator 204 divides the input user data into a block S with a length of a bit, and adds b binary numbers at the beginning of the block S to obtain a new block T with a length of a+b. Since there are 2 ^b combinations of binary numbers of length b, the source word generator 204 will output 2 ^b different new blocks {T ₁ , T ₂ ,..., T _2b }, each new block at this time T _i contains (a+b)/m source words, where m is the length of source words, where m=5. Taking a=58, b=2 as an example, for each block S, the source word generator 204 can generate 2 ² =4 new blocks T, namely 00S, 01S, 10S and 11S.

In Fig. 1, the main encoding/decoding table converter 201 is composed of an encoding/decoding table 202 and a state register 203, wherein the encoding/decoding table 202 adopts the encoding/decoding table shown in Table 1, but other similar encoding tables can also be used. /decode table. Enter the source word B (t) of 201 of main compilation/decoding table converter according to the encoding rule of coding/decoding table 202, and according to the state S (t) of current coder, select corresponding subtable to be converted into corresponding 8 more Codeword X(t) composed of sub-order code elements, at the same time, the next state NS corresponding to source word B(t) in the subtable is sent to the state register, and the value in the state register indicates that the next source word B The state S(t+1) that the encoder is in at the transition of (t+1). The codeword X(t) forms a multi-level symbol sequence after parallel-to-serial conversion, and sends it to the DC controller 205 in FIG. 1 .

The DC controller 205 stores the encoding result corresponding to each new block T _i in the storage unit, and selects the final multi-level data conversion result by comparing the run-length digital sum (RDS: RunningDigital Sum) at the end of each block encoding, and output the selected result. Here we define the run-length sum sequence {RDS _i } of the multi-order channel sequence {xi} ( _xi ∈ {0, 1, 2, ₃ }) formed by codewords after encoding conversion as:

${\mathrm{<span\; class="notranslate">\; RDS</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\underset{\mathrm{<span\; class="notranslate">\; j</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 1</span>}}{\overset{\mathrm{<span\; class="notranslate">\; i</span>}}{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; RDS</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

y _i =2 _xi -(M-1), (2)

Where y ₀ =0, RDS ₀ =0, M is the order, M=4, and the sequence {y _i } is the multi-order polar sequence corresponding to the multi-order channel sequence {xi _} . Since the source word generator 204 generates 2 ^b different new blocks, different multi-order channel sequences will be obtained after modulating these new sequences, and the DC controller 205 chooses to make the run-length sum {z _i } The encoding result with the smallest absolute value is taken as the encoding result, so that the run length number corresponding to the sequence {xi _} and the value of {RDS _i } satisfy:

N ₁ ≤ RDS _i ≤ N ₂ , (3)

Where N ₁ (-1000≤N ₁ ≤0) and N ₂ (0≤N ₂ ≤1000) are two finite constants. In this way, the components of the coded multi-order channel sequence in the low frequency band can be controlled.

For those skilled in the art, by reading the description of the modulation code encoding/demodulation step and its device in this patent, the encoding method and device described in this patent can be easily realized by hardware or software, or a combination of hardware and software .

In order to achieve the above object, the present invention provides a novel 4-yuan (2,9) RLL code of a code rate R=5/8 (bit/symbol), which can convert the source word formed by 5 binary user data into A code word composed of 8 multi-level symbols, wherein the multi-level symbols belong to the set {0, 1, 2, 3}. On the premise that other parameters remain unchanged, the multi-level storage system using the 4-element (2,9) RLL code can increase the storage capacity and data transmission rate by about 25% compared with the original 2-level DVD storage system.

According to the novel multi-level data encoding method and device proposed by the present invention, the multi-level symbol sequence obtained satisfies the run-length constraint of d=2, k=9, that is, the number of consecutive occurrences of the same symbol in the sequence is at least d+1=3 times , the maximum is k+1=10 times. In addition, in order to facilitate the duplication and production of discs, the adjacent non-zero symbol strings in the channel symbol sequence must be replaced by zero symbol strings satisfying the (2,9) RLL constraint separated. The parameter d=2 determines that the minimum run length that may appear in the channel sequence is 3T, and the parameter k=9 determines that the maximum run length that may appear in the channel sequence is 10T.

The encoding/decoding table is characterized by being divided into 6 sub-tables, corresponding to 6 encoder states respectively. The sub-table corresponding to each state contains 32 sub-tables of channel codewords composed of 8 multi-order symbols, and the next state of the encoder corresponding to these channel codewords, and the set of channel codewords in each sub-decoding table is different. intersect.

The demodulation method and device thereof are characterized in that they can easily determine the state to which the code word composed of 8 multi-order symbols belongs; they have the ability to select the current code word required for decoding according to the current code word and its subsequent code word information. The device of the sub-decoding table used; the device of obtaining the corresponding source word by using the current code word and the selected decoding table.

According to the present invention, a multi-stage optical storage device for Blu-ray can be provided, which has recording pits formed by laser inscription, and the recording pits correspond to the stored data modulated by the above-mentioned run-length limited encoding.

FIG. 2 shows a flowchart of the modulation steps of the above-mentioned quaternary (2,9) RLL code. Specific steps are as follows:

Step 1: initialize the current state S of the state register 203 to state 1, state 5 or state 6, initialize the current run number and value CRDS to 0, get i=1, and enter step 2;

Step 2: input user data to the source word generator 204 shown in Table 1, the source word generator divides the user data into a block S with a length of a bit, and the source word generator 204 adds b binary numbers at the beginning of the block S Count and obtain 2 ^b new blocks {T ₁ , T ₂ , ..., T _2b } whose length is a+b, where a+b is selected as an integer multiple of the source word length m (where m=5) in the coding table , go to step 3;

Step 3: Save the state S of the current encoder, the run length number and the value of CRDS, and go to step 4;

Step 4: the block T _i is input to the master code table converter 201, select the corresponding subtable in the code/decode table 202 according to the state information stored in the status register 203, and the first m (=5) bits of the block T _i The source word is converted into a code word of n (=8) multi-order symbols, and the next state information NS corresponding to the m source word is sent into the state register 203 simultaneously, and this state information is used to block T _i Convert the next m-bit source word of the source word, repeat the above source word and code word conversion process until the encoding of the block T _i is completed; the obtained length is e=(a+b)×n/m multi-order channel code Yuan sequence Ch _i , run length sum ERDS(i)=CRDS, next state NS(i) are sent into and stored in the storage unit of DC controller 205 when encoding finishes, and wherein CRDS is the current accumulative run length sum of encoder , the value is constantly changing with the encoding process, enter step 5;

Step 5: make i=i+1, if i<2 ^b then make the state information stored in the state register 203 be the state S saved in step 3, the current run number and CRDS of the encoder are the CRDS saved in step 3, and enter Step 4, otherwise go directly to step 6;

Step 6: The DC controller 205 selects the multi-order channel corresponding to the ERDS(j) (j ∈ {1, 2, ..., 2 ^b }) with the smallest absolute value according to the stored 2 ^b ERDS values Symbol sequence Ch _j is as the output result after current block S coding, makes the state S=NS (j) of coder simultaneously, current run length figure sum CRDS=ERDS (j), enters step 7;

Step 7: If the encoding is finished, stop the operation, otherwise go to step 2.

The demodulation steps and decoding device for the multi-order symbol sequence obtained by the quaternary (2,9) RLL code of the present invention will be described below. Fig. 4 shows a flowchart of the demodulation steps of the quaternary (2, 9) RLL code proposed according to the present invention. Firstly, by segmenting the multi-order symbol sequence obtained by detecting the regenerated signal, a codeword is formed with 8 consecutive multi-order symbols as a group; then, according to the current codeword information to be decoded and the following codeword Word information, and decode the current code word according to the decoding rule shown in Figure 3, and output the obtained 5-bit source word. Its specific decoding process has been described above.

FIG. 4 shows a circuit block diagram of a decoding device for the quaternary (2,9) RLL code proposed according to the present invention. First, the multi-order symbol sequence is input to the code word divider 501 to obtain a code word unit composed of 8 multi-order symbols; then, the current code word CW is sent to the decoding table converter 503 to wait for decoding, while the code Word CW and the code word NCW following it are sent into state discriminator 502 simultaneously; Afterwards, the belonging state information S and NS of code word CW and NCW are sent into decoding table converter 503, and decoding table converter 503 decodes from Select an appropriate sub-table in the table 504 to convert the current codeword CW into a source word B(t) composed of a corresponding 5-bit binary number and serve as the output of the decoding table converter 503 . Also, the decoding table converter 503 outputs information that demodulation cannot be performed for code patterns that do not appear in the decoding table 504 . In the decoding process, the code word composed of 7 multi-order symbols is used as the unit for processing, and since the decoding can be realized only by referring to the current code word CW and the next code word NCW, it can realize that the decoding error is not easy Propagated circuit structure.

To sum up, the present invention proposes a data modulation step and device, demodulation method and device for a Blu-ray multi-stage optical storage device, which is beneficial to its replication and production, and can control the low-frequency component of the encoded channel sequence. Using the novel multi-level data modulation steps and devices proposed by the present invention can produce a new type of multi-level optical disc in which different recording pits are separated by land, that is, has a physical structure similar to that of traditional optical discs, thereby reducing the cost of optical disc duplication and production difficulty. In addition, the multi-order data modulation steps and devices provided by the present invention can also suppress the DC component of the modulated multi-order channel sequence in the low frequency band, and can better meet the requirements of the actual optical disk system servo circuit. On the other hand, the decoding process of this code is also very simple, and it can be processed in units of codewords, and since only the next codeword needs to be referred to during decoding, a circuit structure with minimal propagation of decoding errors can be realized.

In addition, the optical storage system using the 4-element (2,9) RLL code proposed by the present invention has the characteristics of significantly improving the storage capacity and data transmission rate of the storage system without changing the laser wavelength and optical numerical aperture, and is compatible with Current optical storage systems maintain maximum compatibility.

In addition, those skilled in the art should understand that when the present invention is used to make a red-ray disc, the track pitch can be limited to correspond to the laser wavelength used to write the disc, for example, usually less than 0.52 microns, and can also be limited to less than 0.51 microns Or smaller, such as less than 0.50 microns or 0.48 microns. However, the present invention is not limited thereto, and the modulation code encoding/decoding method designed in the present invention is not limited to the track pitch of the optical disc.

The present invention also provides a blue-ray multi-level optical storage device such as a red-ray disc, which has recording pits formed by laser inscription, wherein the track pitch of the blue-ray multi-level optical storage device is less than 0.52 microns, and the recording pits correspond to the above-mentioned The stored data obtained after modulation by the run-length limited code.

Furthermore, for the purpose of illustration, this paper discloses the specific manufacturers and models of many devices, equipment, or systems used to realize the present invention, but those skilled in the art should understand that this is not intended to limit the present invention, and other Products of other models of manufacturers can also implement the present invention.

In addition, the present invention is not limited to the above-described respective embodiments, and the respective embodiments can be appropriately changed within the scope of the technical idea of the present invention. The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. multistage brigade commander's data transfer device that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is less than 0.52 micron, it is characterized in that, comprise modulation step: utilize coding schedule and coder state information based on run-length-limited encoding, the source word of input is transformed to code word, utilizes laser to be burnt to described code word and form multistage sequence of symhols in the described blue light multi-order optical storage apparatus; Wherein,

Described run-length-limited encoding is 3 yuan of (d of code check R=5/7 bits/sym, k) sign indicating number, be used for the 5 bit source words that 10 system user data are formed are transformed into the code word that 7 multistage code elements are formed, d=2 wherein, the minimum number of representing code element ' 0 ' between two non-zero symbol, k is equal to or greater than 9, and k represents the number of the maximum possible of code element ' 0 ' between two non-zero symbol;

Wherein, described code element comprises ' 0 ', ' 1 ', ' 2 ', '? ' and ' # ', wherein,? ∈ 0, #, * }, # ∈ 1,2}, * ∈ { 0,1,2}, code element '? ' be code element undetermined, code element ' * ' expression first kind DC control code element, code element ' # ' the expression second class DC control code element.

2. multistage brigade commander's data transfer device according to claim 1, it is characterized in that, described coding schedule comprises 3 sublists, correspond respectively to 3 states of described scrambler: state 1, state 2 and state 3 comprise 32 code words that are made of 7 multistage code elements in each described sublist, and with the NextState of the corresponding scrambler of these code words, and, being used for the coding of next source word with the corresponding sublist of described NextState, the set in described each sublist is mutually disjointed.

3. multistage brigade commander's data transfer device according to claim 2 is characterized in that, by following steps change described DC control code element ' # ' and code element undetermined '? ' position and value:

Elder generation is respectively the codeword division that comprises DC control code element ' # ' two kinds of code words of ' 1 ' and ' 2 ' for the DC control code element, perhaps comprise code element undetermined '? ' codeword division be that code element undetermined is respectively ' 0 ', ' 1 ' and three kinds of code words of ' 2 ', again code word after cutting apart and the merging of other code words.

4. multistage brigade commander's data transfer device according to claim 3 is characterized in that, the source word with input in the described modulation step is transformed to code word and may further comprise the steps: step (1): described coding schedule is input in the storer of chief editor's code table converter;

Step (2): the status register in chief editor's code table converter is initialized as state 1, and state 2 or state 3 are simultaneously z ₀And y ₀Be initialized as 0, described z ₀Be meant 3 yuan of multistage sequence of symhols { x _iDistance of swimming numeral and, described i is the sequence number of multistage code element x in the sequence, the distance of swimming numeral when i multistage code element finishes and

With seasonal y _iInitial value y ₀=0, described y _iBe meant 3 yuan of pairing polarity sequences of multistage code element, y _i=2[(y _I-1+ x _i) mod3-1], described i and i-1 are the sequence number of multistage code element x and y in the sequence;

Step (3): the source word maker is extracted 2 system user data at random out by 5 one group source word, and is sent in the described storer;

Step (4): the current encoder status information of being stored (the present encoding status information is stored in the storer of scrambler) that described storer utilizes described coding schedule and status register to send here, to be transformed to described code word by the source word that 52 system user data are formed;

Step (5): with described code word through also-connect into multistage sequence of symhols after the string conversion, and described multistage sequence of symhols is sent to the dk limiter, " dk limiter " is " device that can determine the code element undetermined '? ' in the multistage sequence of symhols according to certain rule ";

Step (6): described dk limiter according to the dk restriction rule determine in the multistage sequence of symhols code element undetermined '? ';

Step (7): described dk limiter comprise by described code element undetermined '? ' and the described multistage sequence of symhols of the DC control code element of coming is sent to dc controller;

Step (8): described dc controller is controlled DC control code element in the described multistage sequence of symhols by the value of selecting the first kind DC control code element ' * ' and the second class DC control code element #:

Step (9): dc controller output no longer comprises the described multistage sequence of symhols of described DC control code element.

5. multistage brigade commander's data transfer device according to claim 4 is characterized in that, described step (6) may further comprise the steps:

Step (6.1): code element undetermined '? ' afterwards code word with ' 00 ' beginning, then make code element undetermined '? ' be first kind DC control code element ' * '; Otherwise, directly make code element undetermined '? ' be code element ' 0 ';

Step (6.2): if first kind control code element ' * ' is made as ' 0 ', in case the number that makes ' 0 ' continuous in described multistage sequence of symhols code element greater than predefined k value, is then changed into the second class DC control code element ' # ' to described first kind DC control code element ' * '; Otherwise, keep first kind DC control code element ' * ' constant.

6. multistage brigade commander's data transfer device according to claim 4 is characterized in that, described step (8) may further comprise the steps:

Step (8.1): when the DC control code element occurring in the described multistage sequence of symhols, described dc controller is at previous DC control code element x _mEvery kind of value, according to calculating multistage sequence of symhols distance of swimming numeral and z described in the described step (2) _iFormula calculate described multistage sequence of symhols at next DC control code element x _nVarious x before occurring _mValue is the distance of swimming numeral and the z of multistage sequence of symhols down _N-1

Step (8.2): described dc controller selects to make z _N-1The x of absolute value minimum _mValue as DC control code element x _mFinal value; For last the DC control code element in the multistage sequence of symhols, its value is the numeral of the distance of swimming when calculating multistage sequence of symhols end and determining then;

Step (8.3): the operation of described dc controller repeating step (8.1)～step (8.2) no longer comprises the DC control code element in the gained sequence of symhols;

Step (8.4): the multistage sequence of symhols x that obtains by step (8.1)～step (8.3) _iDistance of swimming numeral and { z _iValue satisfy:

N ₁≤z _i≤N ₂，

N wherein ₁Be satisfied-1000≤N ₁≤ 0 limited constant, N ₂Be to satisfy 0≤N ₂≤ 1000 limited constant.

7. multistage brigade commander's data transfer device that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is less than 0.52 micron, it is characterized in that, comprise demodulation step: the multistage sequence of symhols that will read from described blue light multi-order optical storage apparatus is divided into code word, utilization is converted to source word output based on the decoding table and the decoder states information of run-length-limited encoding with described code word; Wherein, described run-length-limited encoding is 3 yuan of (d of code check R=5/7 bits/sym, k) sign indicating number, be used for the code word that 7 multistage code elements are formed is transformed into the 5 bit source words that 10 system user data are formed, d=2 wherein, represent the minimum number of code element ' 0 ' between two non-zero symbol, k is equal to or greater than 9, and k represents the number of the maximum possible of code element ' 0 ' between two non-zero symbol;

Wherein, described code element comprises ' 0 ', ' 1 ', ' 2 ', '? ' and ' # ', wherein,? ∈ 0, #, * }, # ∈ 1,2}, * ∈ { 0,1,2}, code element '? ' be code element undetermined, code element ' * ' expression first kind DC control code element, code element ' # ' the expression second class DC control code element.

8. multistage brigade commander's data transfer device according to claim 7, it is characterized in that, described decoding table is divided into 3 sublists that comprise described code word, correspond respectively to the state of 3 demoders: state 1, state 2 and state 3 comprise 32 5 bit source words of being made up of 10 systems in described each sublist, in described code word, comprise code element ' X ', expression gets ' 1 ' or ' 2 ', but decoded results is identical; Sign indicating number type ' Z ' in the source word, expression can not be decoded.

9. multistage brigade commander's data transfer device according to claim 8 is characterized in that, the described source word output that described code word is converted in the described decoding step may further comprise the steps:

Step (1): described decoding table is input in the decoding table storer and subsolution code table selector switch in the decoding table converter;

Step (2): the code word CW that forms by 7 multistage code elements to the input of described decoding table converter, the code word NCW that constitutes by 7 multistage code elements after the input of described subsolution code table selector switch follows selected code word CW closely;

Step (3): described subsolution code table selector switch is according to the pairing coder state sequence number of the sub-coding schedule at described code word NCW place, and lists with the decoding table conversion method after converting this coder state to same number of state indexes subsolution code table again;

Step (4): described decoding table converter according to the code word CW that is imported from

Finding out the 5 bit source word B (t) that form with 10 systems in the subsolution code table of the described sequence number of step (3) lists.

10. multistage brigade commander's data transfer device that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is less than 0.52 micron, it is characterized in that, comprise the demodulation step described in each described modulation step and claim 7 to 9 in the claim 1 to 6.

11. the multistage brigade commander's DTU (Data Transfer unit) that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is characterized in that less than 0.52 micron, comprises multiple ranks runlength length limited code device, and it comprises:

Chief editor's code table converter, be used for basis based on the coding schedule of run-length-limited encoding and according to the coder state that is stored in status register, source word is converted to the code word that constitutes by a plurality of multistage code elements, and to described code word carry out also-go here and there the conversion to form multistage sequence of symhols, wherein, described multistage code element comprises code element undetermined;

Limiter is used for determining the code element described undetermined of described multistage sequence of symhols; And

Dc controller is used for selecting the value of DC control code element according to described code element undetermined, thereby controls the DC component in the described multistage sequence of symhols; Wherein,

Described run-length-limited encoding is 3 yuan of (d of code check R=5/7 bits/sym, k) sign indicating number, be used for the 5 bit source words that 10 system user data are formed are transformed into the code word that 7 multistage code elements are formed, d=2 wherein, the minimum number of representing code element ' 0 ' between two non-zero symbol, k is equal to or greater than 9, and k represents the number of the maximum possible of code element ' 0 ' between two non-zero symbol;

Wherein, described code element comprises ' 0 ', ' 1 ', ' 2 ', '? ' and ' # ', wherein,? ∈ 0, #, * }, # ∈ 1,2}, * ∈ { 0,1,2}, code element '? ' be code element undetermined, code element ' * ' expression first kind DC control code element, code element ' # ' the expression second class DC control code element.

12. the multistage brigade commander's DTU (Data Transfer unit) that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is characterized in that less than 0.52 micron, comprises multiple ranks runlength length limited decoding device, and it comprises:

The codeword division device is used for multistage sequence of symhols is divided into the code word that is made of multistage code element;

Subsolution code table selector switch is used for according to the status information that follows the pairing coding schedule of next code word after current described code word closely, selects the decoding subsolution code table that current described code word adopted; And

The decoding table converter is used for according to the information of selected subsolution code table from selecting suitable described subsolution code table based on the decoding table of run-length-limited encoding and convert described current code word to corresponding source word and with its output; Wherein,

Described run-length-limited encoding is 3 yuan of (d of code check R=5/7 bits/sym, k) sign indicating number, be used for the code word that 7 multistage code elements are formed is transformed into the 5 bit source words that 10 system user data are formed, d=2 wherein, the minimum number of representing code element ' 0 ' between two non-zero symbol, k is equal to or greater than 9, and k represents the number of the maximum possible of code element ' 0 ' between two non-zero symbol.

13. multistage brigade commander's DTU (Data Transfer unit) according to claim 12, it is characterized in that, described decoding table is divided into 3 sublists that comprise described code word, correspond respectively to the state of 3 demoders: state 1, state 2 and state 3 comprise 32 5 bit source words of being made up of 10 systems in described each sublist, in described code word, comprise code element ' X ', expression gets ' 1 ' or ' 2 ', but decoded results is identical; Sign indicating number type ' Z ' in the source word, expression can not be decoded.

14. multistage brigade commander's DTU (Data Transfer unit) that is used for blue light multi-order optical storage apparatus, wherein, the track pitch of described blue light multi-order optical storage apparatus is less than 0.52 micron, it is characterized in that, comprise claim 12 described multiple ranks runlength length limited code device and the described multiple ranks runlength length limited of claim 13 decoding device.

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