CN1521754A - Digital data modulation method / apparatus and data recording medium generated and modulated from the apparatus - Google Patents
Digital data modulation method / apparatus and data recording medium generated and modulated from the apparatus Download PDFInfo
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Abstract
The invention relates to the digital data modulation method / apparatus for quick and accurate determination of the modulation frequency coded words on the boundary between the data modules in order to record data on recording medium by using the (d, k) limitation condition of the Run Length Limited (RLL) of the running period modulation code, and the data recording medium created and modulated by using the apparatus. The digital data modulation method according to the invention is characterized in that, after receiving the final bit of the modules formed by specific bits, the preset bit modulation data sheet is taken into consideration to obtain the modules obeying the k-limitation condition set above on the running period modulation code (RLL) having the (d, k) limitation condition.
Description
(1) technical field
The invention relates to digital data-modulated, more specifically be about at the recording medium identifying recording layer, utilize and regulate code (Run Length Limited running period, RLL) (d, k) restrictive condition, the digital data modulation method of rapider and channel identification code literal that modulate on the boundary between the accurate determination data module/install and utilize this device to generate and the data medium of modulation.
(2) background technology
Usually behind modulating data, be recorded in NRZI in the middle of the method for recording medium (Non-Return-to-Zero-Inverted: the reversing non-return-to-zero) code be when detected signal is a binary number ' 0 ' on the recording medium be on the magnet in the expression recording medium without any variation, be that the direction that expression is recorded in the magnet recording medium in is moved in the other direction when detected binary number is ' 1 ' on the recording medium, with this at the recording medium identifying recording layer and detect or play the signal that writes down.
Regulating code (RLL) running period of utilizing recently is the code that expands above-mentioned NRZI code, the data of 8 bits (byte) is converted to the special code (code literal) of 16 bits.So, above-mentioned code literal dense more when being recorded in recording medium the record efficiency of recording medium be can improve more.Such as, 8 bits are to become 256 bit number combination, 16 bits are to become 65536 bit number combination, so the RLL code is the number of combinations of 256 bits that generate according to 8 bits, and conversion is generated as 256 in the 65536 bit combination numbers that generate with 16 bits.This moment, above-mentioned data converted was to satisfy following restrictive condition (constraint).
First restrictive condition is, the value of ' 0 ' bit that having continuously that to have at least in the middle of the bit number of ' 1 ' value be to have.The data recording density of preserving than there not being specific limited such as a data bit is big three times, and the data that then are recorded on the above-mentioned recording medium are with higher recording density record.At this moment, above-mentioned first restrictive condition is, also can allow the magnet polarity of the data bit that is recorded in above-mentioned recording medium though be recorded in above-mentioned recording medium with high record density, bit in the distance of difference (or a bit and another bit be in advance distance the time permission distance) on.Be exactly that the bit of first restrictive condition is that continuous recording is a series of on recording medium ' 0 ' bit value in the time of data of playing on those records, does not allow and produces the condition of interfering between the symbol.
Second restrictive condition is the quantity of 0 between coherent ' 1 ' bit of restriction and the ' 1 ' bit.Above-mentioned second restrictive condition is, in the time of the data migtation direction play, at the above-mentioned migration action bit of locking, as blocking the loop, with this data recovery frequency signal from playing.
Above-mentioned RLL code is to show as (d, k) code, here d will insert the MIN quantity that has ' 0 ' value between the bit that has ' 1 ' value that links up, and k is the quantity that will insert the maximum that has ' 0 ' value between the bit that has ' 1 ' value that links up.Such as (1,7) code is the code that following condition is satisfied in expression.Between the bit that has ' 1 ' value of record the condition of at least more than one the bit that has ' 0 ' value with, the coherent condition that has ' 0 ' value bit is arranged between the bit that has ' 1 ' value of record below 7.The bit that be encoded when satisfying above-mentioned condition this moment is, for having the bit of ' 1 ' value, the interval that does not have pulse to move is the bit that is modulated to have ' 0 ' value for the high-frequency of the data pulse edge modulation to low frequency or low frequency to the high-frequency migration.Then the minimal reverse of data pulse to during be to represent with (d+1) T, maximum is to represent with (k+1) T during reverse.Here T is that record data stream represents the bit time interval.Such as (d, k)=(1,7) code, minimum reverse during (Tmin) become 2T, the highest reverse during (Tmax) become 8T.
Along with increase is recorded in the recording density of the data of recording medium, above-mentioned minimal reverse to during (Tmin) generate minimum running (2T) continuously, therefore the record data stream of entering may comprise distortion.The focus factor and the normal vector factor that are exactly 2T waveform output amplitude be, than the focus factor of other output waveform amplitude with the normal vector factor is littler also easier scatters.Therefore easier making a mistake when playing the data of record.
As the data-signal of above-mentioned mistake modulated after, the record in become the channel data stream that comprises the CD composition.At this moment, in the time of such as the driver of recording mediums such as servocontrol CD, many rub-out signals such as trail-and-error easier occur with the form of variation or shake.
So, generate as far as possible and be modulated into the signal that does not comprise the DC composition.For this reason, for the former code control number value of closing (Digital Sum Value, DSV).
Above-mentioned DSV means that addition carries out the value of the data stream that NRZI modulation back generates for former code.
On light or magnetic optical recording track record or the method that reads sound signal be utilize EFM (Eight-to-Fourteen Modulation, EFM) or EFMPlus (Eight-to-FourteenModulation Plus, EFMPlus).
The EFM-modulation signal is, 8 bit data word that connect are converted to the channel code literal that insert the merging words of 3 bits and generate behind the 14 bit code literal that connect more.Each code literal of above-mentioned in other words 14 bits will satisfy following condition.Between the bit of two coherent having ' 1 ' values, have the bit of ' 0 ' value minimum length (running length in minimum ' 0 ' is 2 d), has the maximum length (' 0 of the bit of ' 0 ' value ' length that turns round, k) be 10 condition.
Moreover, in order between above-mentioned code literal, to satisfy above-mentioned restrictive condition, in the utilization merging words of 3 bits.Such as for 83 bit merging words, can use the mergingwords of 43 bits.Become 001,010,000,100 exactly, 3 remaining bit merging words (111,011,101,110) can not use because running counter to above-mentioned k (=2) restriction rule.
Rule decision merging words according to above-mentioned can reduce the low wave component of modulation signal with this.
But the digital modulator approach of former use is, can not can not be modulated to channel character to the code text conversion of the above-mentioned DSV input of control to the code literal accurately again rapidly on the boundary line between the module that is made of a plurality of code literal (being exactly between first coded word of the last code literal of a module and next module) for the channel code literal.
(3) summary of the invention
Fundamental purpose of the present invention is to be to provide a kind of at the recording medium identifying recording layer, utilize and regulate code (Run Length Limited running period, RLL) (d, k) restrictive condition, the rapider and digital data modulation method accurately channel code literal of the boundary line between determination data module modulation with and device.
Another object of the present invention is to be to provide a kind of the utilization to regulate code (RunLength Limited running period, RLL) (d, k) restrictive condition, the rapider and digital data modulation method accurately channel code literal of the boundary line between determination data module modulation with and device and preserving utilize the recording medium of the digital modulating data that its device generates.
For reaching above-mentioned purpose, according to digital data modulation method of the present invention, be characterized in: after having received the last bit of the module that certain bit forms, with reference to the bit modulation tables of data that is provided with in advance, having (d, k) regulate the running period of restrictive condition code (Run Length Limited, RLL) on, do not violated the module of the k-restrictive condition of above-mentioned setting.
According to recording medium of the present invention, be characterized in: after having received the last bit of the module that certain bit forms, with reference to the bit modulation tables of data that is provided with in advance, having (d, k) regulate code (Run Length Limited the running period of restrictive condition, RLL) on, do not violated the back, position of the k-restrictive condition of above-mentioned setting and preserved.
According to digital data modulation method of the present invention, its characteristics comprise following several stages:
The 1st stage was to draw the end ' 0 ' running length when the last code literal of front module;
The 2nd stage was, drew the beginning ' 0 ' running length of the encoding state that corresponding next module begins; With
The 3rd stage was, after total ' 0 ' running length that above-mentioned end ' 0 that adds respectively ' running length and beginning ' 0 ' running length are generated and the k-restrictive condition that is provided with are in advance compared, only selected to satisfy the code literal of above-mentioned k-restrictive condition.
According to digital data modulation method of the present invention, its characteristics comprise following several stages:
The 1st stage was to form a plurality of intermediate segment after the additional different mutually numeric character on the data word of input;
The 2nd stage was, a plurality of intermediate segment of above-mentioned generation, was modulated to according to the m/n coding ratio of prior setting and met (d, k) fragment of restrictive condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment, promptly with former meeting (d, k) fragment of restrictive condition links to each other ' 0 ' running period, can not satisfy (the d of k restrictive condition, k) restrictive condition meets fragment, selects to treat to be recorded in (d, k) fragment of restrictive condition of meeting of recording medium.
According to digital data modulation method of the present invention, be characterized in comprising following several stages:
The 1st stage was to form a plurality of intermediate segment after the additional different mutually numeric character on the data word of input;
The 2nd stage was, a plurality of intermediate segment of above-mentioned generation, was modulated to according to the m/n coding ratio of prior setting and met (d, k) fragment of restrictive condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment, promptly the ratio k that uses in above-mentioned stage of modulating is little, surpass again the having of kset value ' 0 ' running period fragment meet (d, k) fragment of restrictive condition, selection treats to be recorded in (d, k) restrictive condition of meeting of recording medium.
According to recording medium modulator approach of the present invention, be characterized in comprising with lower member:
After additional different mutually numeric character on the data word of input, generate the generating unit of a plurality of intermediate segment;
According to the m/n coding ratio of prior setting, a plurality of intermediate segment of above-mentioned generation be modulated into meet that (d k) after the fragment of condition, meets in above-mentioned medical treatment that (d, k) one of the person of choosing meets (d, k) selection portion of the fragment of restrictive condition in the fragment of condition.
According to digital data modulation method of the present invention, be characterized in comprising following several stages:
The 1st stage was after additional different mutually numeric character on the data word of input, to generate a plurality of intermediate segment;
The 2nd stage was, according to the m/n coding ratio of prior setting, a plurality of intermediate segment of above-mentioned generation are modulated into meet (d, k) fragment of condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment-with the former (d that meets, k) fragment of restrictive condition links to each other ' 0 ' running period, can not satisfy the k restrictive condition (d, k) restrictive condition meets (d, k) fragment of restrictive condition of meeting that fragment-selection treats to be recorded in recording medium.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the structured flowchart of expression according to digital data-modulated device of the present invention.
Fig. 2 is the structural representation according to the channel code literal that is included in a bit in the data module of the digital data-modulated device of the present invention.
Fig. 3 a-3b is the pie graph of expression according to the structure of data channel module of the present invention.
Fig. 4 is the process flow diagram of expression according to digital data modulation method of the present invention.
(5) embodiment
Fig. 1 is the structured flowchart of expression according to digital data-modulated device of the present invention, comprises following several parts: the fragment generating unit 100 that generates data slot after the reception data word; Select to satisfy (d, k) selection portion 200 of the fragment of restrictive condition after receiving above-mentioned data slot; Preserve reference data, (d k) provides the modulating data preservation portion 300 of reference during the fragment of restrictive condition when above-mentioned selection portion 200 is selected to satisfy; That reception is satisfied is above-mentioned, and (d k) generates the encoding section 400 that low ripple is divided into the fragment of restriction after the fragment of restrictive condition.
Here, above-mentioned fragment generating unit 100 comprises with lower member: receive after the above-mentioned data word they backs of interosculating are generated the portion of piecing together 102 of the generation data slot of the increase portion 101 of a plurality of intermediate segment and scrambling.
Above-mentioned selection portion 200 comprises following parts: after receiving the data slot of above-mentioned fragment generating unit output, generation can be selected meets (d, k) fragment of restrictive condition (alternative (d, k) constreainedsequence) (d, k) scrambler 201; Receive above-mentioned can select meet (d, k) after the fragment of restrictive condition, judge whether Sub sequence is wherein arranged---' 0 ' become long string, or the running period of indefinite (alternate) Tmin long string judging part 202; Based on the information of above-mentioned judging part 202 decisions, select to satisfy (d, k) selector 203 of the fragment of restrictive condition and output.
Simultaneously above-mentioned judging part 202 comprises following parts again: (d k) after the fragment of restrictive condition, calculates ' computing machine 1 running period of 0 ' running period to receive above-mentioned meeting of can selecting; (d k) after the restrictive condition fragment, detects the whether busy synchronous synchronous detection machine 2 of decision earlier therein to receive above-mentioned meeting of can selecting; Receive above-mentioned can select meet (d, k) the Tmin computing machine 3 of the running period of the Tmin that calculate to link up after the fragment of restrictive condition; (d k) calculates the DSV computing machine 4 of the running period of DSV after the fragment of restrictive condition to receive above-mentioned meeting of can selecting; (d k) calculates the k-condition computing machine 5 that the k-between two fragments that link up limits after the fragment of restrictive condition to receive above-mentioned meeting of can selecting.
Below with reference to figure 2-4, describe as constituted above action in detail according to digital data-modulated device of the present invention.
At first as shown in Figure 2, it has represented the structure that is included in the channel code literal of a bit in the data module according to of the present invention, Fig. 3 a-3b is the structure pie graph of expression according to data channel module of the present invention, and Fig. 4 is the process flow diagram of having represented according to digital data modulation method of the present invention.
According to data unit of the present invention as shown in Figure 2, comprise following parts: the code literal; The leader (leading portion) of ' 0 ' number that the place ahead at above-mentioned code literal is represented; The part (trailing portion) of smearing of ' 0 ' number that the rear of above-mentioned code literal is represented.Moreover be shown in Fig. 3 a by the module that above-mentioned unit forms, with other module form certain module data (B1, B2 ..., Bi, Bi+1 ...).
As Fig. 3 a, when being connected between module and the module, shown in Fig. 3 b, the k-restrictive condition that the leader (L) of first unit of the module (Bi+1) that links to each other with the part (T) of smearing of the last unit that works as front module (Bi) must satisfy prior setting could be connected with the above-mentioned front module of working as.
Describe above-mentioned module in detail with reference to figure 4 below and be connected to each other the process that forms module data.
K-condition computing machine 5 is the (d that meet that can select, k) between the restrictive condition fragment, whether satisfy the k-restrictive condition for judging them, thereby input is preserved relatively can select meet (d, k) restrictive condition fragment and current input can select meet (d, k) (0) running period between the fragment of restrictive condition.Above-mentioned exactly former input can select meet (d, k) smear part (T) and the current input of the fragment of restrictive condition can select meet (d, k) value of the closing k of ' 0 ' running period of the leader of the fragment of condition (=T+L) and the kset value that is provided with in advance, in the time of T+L＞kset, can abandon current fragment (ST1 ~ ST4 or ST5 and ST7) and receive new fragment and repeat said process.Above-mentioned (d k) during restrictive condition, selects current fragment ST6 if satisfy then.Above-mentioned fragment is as shown in Figure 2, can be included in the unit in the module, and said process is could decision module after carrying out for unit.
Above-mentioned here k-condition computing machine 5 is so that (d, k) table of scrambler 201 is the basis, when the m byte is modulated to the n byte, can reset the k condition of the value littler than the k value (kset).When resetting, above-mentioned k-condition computing machine 5 is for full fragment, confirm whether to have the ' 0 ' running period that surpasses the kset that has been provided with, if with continuous during ' 0 ', above-mentioned fragment done mark after, above-mentioned fragment is outputed to selector 203.
When so modulating, even also can there be the fragment that satisfies the kset condition in the condition littler than k condition.Such as generate to select 2r can select meet (d, k) restrictive condition, so will inevitably there be the fragment that satisfies the kset condition in the r value when big in its value.At this moment the signal that is recorded is more frequent than usual.
If above-mentioned (d, k) table that uses of scrambler 201 is, and such as making in the k=14 condition, above-mentioned k-condition computing machine 5 can select 9,10,11,12, and a value in 13 is as the kset condition.(d k) can not draw the fragment that satisfies kset in the restrictive condition fragment to the too little words of Kset, therefore gets rid of too little value in above-mentioned meeting of can selecting.
(d, k) scrambler 201 condition be during such as k=18, kset can use any value between 9 to 17.
So as several measured values above-mentioned mensuration or that calculate or calculated value and, the mark of representing according to synchronous detection is from above-mentioned judging part 202, outputs to above-mentioned selector 203.This moment, above-mentioned selector 203 was according to several measured values of above-mentioned input and the related last fragment selecting record of DSV decision.The fragment that have the mark of set on the above-mentioned judging part 202 this moment is after getting rid of in the middle of the alternative, and (d k) selects one in the restrictive condition fragment in remaining meeting of can selecting.
(the d that meets as above-mentioned selection, k) fragment of restrictive condition is, be converted to modulation signal by precoder 400 by the NRZI process of prelisting, above-mentioned modulation signal is to be to move in ' 1 ', in ' 0 ' is that (D, k) fragment of restrictive condition is recorded in recording medium after generating to satisfying of not taking place to move.
Simultaneously be according to above-mentioned modulator approach of the present invention, as channel (d, k) scrambler 201 has s/c (s: former code, c: in the time of channel code) code modulated rate, the fragment that is transfused to is not violated the RLL code, and (d, the channel code literal is made in the situation downward modulation of the k restrictive condition of k) stipulating on the code.Here, above-mentioned (d, k) scrambler 201 be between adjacent code literal with reference to modulating data preservation portion, be made as channel code with this situation downward modulation of not violating the k restrictive condition.In other words, in order not allow the code literal violate the k restrictive condition, after the number with ' 0 ' beginning of number code literal under each state, determine maximal value in the boundary line that two modules connect.
Quote the article of the PCT/KR00/01292 of this author publication below, draw the method for vector.
As the article of former publication, in 9/13 modulation rate, 13 encoding states (coding states) and d restrictive condition are on 1 the code table, vector (v) be 9,5,3,3,2,2,1,1,0,0,0,0,0}.Above-mentioned in other words vector is the encoding state for 13, is illustrated respectively in the longest beginning ' 0 ' the running length value in the code literal under the correlative coding state.As the v (1)=the 9th of above-mentioned first value, expression; To begin to have continuously the maximum number (be exactly to begin ' 0 ' running length) of the byte of ' 0 ' value be 9 to first byte in the middle of the code literal that is under the encoding state.Same v (2)=the 5th, running length value in beginning ' 0 ' is 5 in the middle of the expression code literal.
So as above-mentioned mode, utilize the modulating data table, can draw vector (byte number that has beginning ' 0 ' running length value of next state).
Above-mentioned vector (v) is the difference according to state, according to the different definition of different modulometers simultaneously.
Moreover the method that is modulated into the channel code literal between the module is that to be modulated into the method for channel code literal identical with the code literal of modulation in the above-mentioned module, is described in detail below.
For modulation channel code literal correct between module, the code literal is modulated into behind the channel code literal carries out in the Channel Modulation process for a module, the initial point that finishes in above-mentioned module draws ' 0 ' running length value (T).On above-mentioned initial point, can learn next state (U), therefore also can calculate the vector (V (U)) of next state.
When end ' 0 ' the running length value (T) of the last code literal that finishes module added beginning ' 0 ' running length value (L) next encoding state under, length value (k=T+L) turned round in ' 0 ' that can calculate the code literal of modulating in advance on next module.Above-mentioned budget ' 0 ' running length value (k) be with the kset value of prior setting relatively after, the running length value is bigger than the kset value of above-mentioned prior setting when ' 0 ' of above-mentioned budget, and the code literal that is transfused to is to exclude in the middle of the arrangement of channel code literal to be modulated.
So digital data modulation method of the present invention with and device be can be between module correct modulation be input to the data of channel.
Moreover utilize the digital modulating data that generates according to digital data modulation method of the present invention/device to be, can be kept on certain recording medium, and can utilize above-mentioned recording medium according to the code type mode of finding between the module, directly be modulated into the channel code literal.
As mentioned above, according to digital data modulation method of the present invention/device, and the recording medium of preserving the modulated digital data of utilizing its generation is, satisfy the RLL code (d k) determines only to be modulated in the module that has a certain size former code of channel code literal restrictive condition the time again rapidly and accurately.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (26)
1. digital data modulation method, after having it is characterized in that receiving the last bit of the module that certain bit forms, having (d, k) cycle of operation of restrictive condition is regulated on the code, is not violated the module of the k-restrictive condition of above-mentioned setting with reference to the bit modulation tables of data that is provided with in advance.
2. digital data modulation method as claimed in claim 1, the stage that it is characterized in that the module of the described k-restrictive condition of not violated above-mentioned setting also comprised with the next stage: after the running length addition of unit to be modulated, calculate the k-restrictive condition of the last unit of above-mentioned module on the running length of the last unit of above-mentioned module and the next module.
3. digital data modulation method as claimed in claim 1 is characterized in that above-mentioned module is to comprise a plurality of units.
4. digital data modulation method as claimed in claim 1 is characterized in that above-mentioned unit comprises; The part of smearing of the number of the leader of the number of code literal and represent ' 0 ' individual and represent ' 0 ' individual at the rear of above-mentioned code literal in the place ahead of described code literal.
5. a recording medium is characterized in that preserving as the resulting modulated data of the described digital data modulation method of claim 1 to 4.
6. recording medium, after having it is characterized in that receiving the last bit of the module that certain bit forms, the bit modulation tables of data with reference to being provided with is in advance having (d, k) cycle of operation of restrictive condition is regulated on the code, is not violated the module and the preservation of the k-restrictive condition of above-mentioned setting.
7. recording medium as claimed in claim 6 is characterized in that the above-mentioned unit that draws is modulated data.
8. recording medium as claimed in claim 6, it is characterized in that the above-mentioned module of addition last unit running length and be modulated at the running length of unit of next module after, calculate the k-restrictive condition of the last unit of above-mentioned module.
9. recording medium as claimed in claim 6 is characterized in that above-mentioned module comprises a plurality of units.
10. recording medium as claimed in claim 6 is characterized in that above-mentioned unit comprises: the part of smearing of the number of the leader of the number of code literal and represent in the place ahead of described code literal ' 0 ' individual and represent at the rear of above-mentioned code literal ' 0 ' individual.
11. digital data modulation method, it is characterized in that: obtain stage when the end ' 0 ' running length of the last code literal of front module, with the stage of the beginning ' 0 ' running length of the start code state of obtaining corresponding next module, and after the total ' 0 ' running length that adds above-mentioned end ' 0 ' running length and beginning ' 0 ' running length respectively and generate and the k-restrictive condition that is provided with in advance compared, only select to satisfy the stage of the code literal of above-mentioned k-restrictive condition.
12. digital data modulation method as claimed in claim 11, the stage that it is characterized in that above-mentioned obtain when the last code literal of front module and finish ' 0 ' running length is, in the whole units that under the correlative coding state, comprise, begin the correlation of ' 0 ' running length according to the maximum unit decision of beginning ' 0 ' running length.
13. a recording medium is characterized in that preserving the data of the modulation that digital data modulation method as claimed in claim 11 obtains.
14. one kind digital data modulation method is characterized in that comprising with the next stage:
The 1st stage was to form a plurality of intermediate segment after the additional different mutually numeric character on the data word of input;
The 2nd stage was, a plurality of intermediate segment of above-mentioned generation, was modulated to according to the m/n coding ratio of prior setting and met (d, k) fragment of restrictive condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment---with the former (d that meets, k) fragment of restrictive condition links to each other ' 0 ' cycle of operation, can not satisfy the k restrictive condition (d, k) restrictive condition meets fragment---select to treat to be recorded in (d, k) fragment of restrictive condition of meeting of recording medium.
15. digital data modulation method as claimed in claim 14 is characterized in that also comprising with the next stage: a plurality of intermediate segment of piecing together above-mentioned generation.
16. digital data modulation method as claimed in claim 14, it is characterized in that above-mentioned stage of modulating is: for each Input Data word, the numeric character of additional r bit size, generating all can be with the numeric character of r bit size generation, and these are appended on the Input Data word, generate the intermediate segment of r bit with this.
17. a digital data modulation method is characterized in that comprising with the next stage:
The 1st stage was to form a plurality of intermediate segment after the additional different mutually numeric character on the data word of input;
The 2nd stage was, a plurality of intermediate segment of above-mentioned generation, was modulated to according to the m/n coding ratio of prior setting and met (d, k) fragment of restrictive condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment---the ratio k that uses in above-mentioned stage of modulating is little, surpass the having of kset value again ' fragment of 0 ' cycle of operation meet (d, k) fragment of restrictive condition---(d, k) stage of restrictive condition of meeting that selection treats to be recorded in recording medium.
18. digital data modulation method as claimed in claim 17 is characterized in that also comprising with the next stage: a plurality of intermediate segment of piecing together above-mentioned generation.
19. digital data modulation method as claimed in claim 17, it is characterized in that above-mentioned generation phase is: for each Input Data word, the numeric character of additional r bit size, generating all can be with the numeric character of r bit size generation, and these are appended on the Input Data word, generate the intermediate segment of r bit with this.
20. a digital data-modulated device is characterized in that comprising with lower member:
After additional different mutually numeric character on the data word of input, generate the generating unit of a plurality of intermediate segment;
According to the m/n coding ratio of prior setting, a plurality of intermediate segment of above-mentioned generation be modulated into meet that (d k) after the fragment of condition, meets in above-mentioned modulation that (d, k) one of the person of choosing meets (d, k) selection portion of the fragment of restrictive condition in the fragment of condition.
21. digital data-modulated device as claimed in claim 20 is characterized in that above-mentioned fragment generating unit also comprises with lower member: receive after the above-mentioned data word they backs of interosculating are generated the portion of piecing together of the generation data slot of the increase portion of a plurality of intermediate segment and scrambling.
22. digital data-modulated device as claimed in claim 21, it is characterized in that above-mentioned increase portion is: for each Input Data word, the numeric character of additional r bit size, generating all can be with the numeric character of r bit size generation, and these are appended on the Input Data word, generate the intermediate segment of r bit with this.
23. digital data-modulated device as claimed in claim 21 is characterized in that above-mentioned selection portion also comprises with lower member:
For each intermediate segment, be modulated into coding ratio m/n and meet (d, k) scrambler of the fragment of condition;
For each fragment of above-mentioned modulation, be attached to the content of its byte and the judging part of the occurrence frequency of the fragment of appointment in advance;
In each fragment of above-mentioned modulation, select to meet (d, k) selector of the fragment of restrictive condition.
24. a digital data modulation method is characterized in that comprising with the next stage:
The 1st stage was to form a plurality of intermediate segment after the additional different mutually numeric character on the data word of input;
The 2nd stage was, a plurality of intermediate segment of above-mentioned generation, was modulated to according to the m/n coding ratio of prior setting and met (d, k) fragment of restrictive condition;
The 3rd stage was, (the d that meets in above-mentioned modulation, k) on the fragment of restrictive condition, after getting rid of following fragment---with the former (d that meets, k) fragment of restrictive condition links to each other ' 0 ' cycle of operation, can not satisfy the k restrictive condition (d, k) restrictive condition meets fragment---select to treat to be recorded in (d, k) fragment of restrictive condition of meeting of recording medium.
25. digital data modulation method as claimed in claim 24 is characterized in that above-mentioned the 1st stage is: also comprise a plurality of intermediate segment of piecing together above-mentioned generation.
26. digital data modulation method as claimed in claim 24, it is characterized in that above-mentioned the 1st stage is: for each Input Data word, the numeric character of additional r bit size, generating all can be with the numeric character of r bit size generation, and these are appended on the Input Data word, generate the intermediate segment of r bit with this.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101908356B (en) * | 2009-06-04 | 2012-05-23 | 清华大学 | Dual modulation coding method |
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| CN101908356B (en) * | 2009-06-04 | 2012-05-23 | 清华大学 | Dual modulation coding method |
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