CN1534661A - Device for converting series of data command into modulation signal and its method - Google Patents
Device for converting series of data command into modulation signal and its method Download PDFInfo
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- CN1534661A CN1534661A CNA031160662A CN03116066A CN1534661A CN 1534661 A CN1534661 A CN 1534661A CN A031160662 A CNA031160662 A CN A031160662A CN 03116066 A CN03116066 A CN 03116066A CN 1534661 A CN1534661 A CN 1534661A
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Abstract
A device and method for converting a series of data commands to modulating signals are disclosed. Said method includes attaching different digital commands to the input data commands, encoding in predefined mode (NRZI) to generate several coded command sequences, calculating the sum value DSV of each coded command sequence and the penalty value which is the number of Os between two continuous 1 sequences, and choosing the calculated DSV and penalty value relative to the least coded command sequence as the one for recording. Its advantage is high stability of PLL play.
Description
Technical field
The present invention relates to a kind ofly on recording mediums such as disk, photomagneto disk or CD, record, store a series of data command and be converted into the device and the method for modulation signal.
Background technology
Generally, for on recording mediums such as disk, photomagneto disk, CD, write down, store a series of data, needing above-mentioned data-modulated is the code commands sequence that is suitable for recording medium, for example, when containing flip-flop in the code commands sequence after above-mentioned modulation, take place easily to produce multiple rub-out signals such as grasping the track mistake in the servocontrol such as disc driver, or the phenomenon of skew, unstable (jitter) occurs.So signal that will flip-flop is minimum records on the recording medium, its reason is that the record channel is normally responseless to low-frequency component.On the one hand, suppress low-frequency component in signal, for being very favorable during read output signal the recording medium of tracer signal from track, this is the influence that is not subjected to tracer signal because continuous extracting rail operation is controlled.Press down the resistance low-frequency component and can also improve the running of extracting track, make its minimizing can listen interference.Owing to above-mentioned multiple reason, so the code commands sequence flip-flop of will trying not to contain of modulation, for the code commands sequence after preventing to modulate contains flip-flop, the method for use is the DSV control method, about being described as follows of DSV control method.
At first, as shown in Figure 1, general data-modulated device comprises:
Code commands selector switch 20 in above-mentioned code commands order, is selected a minimum code commands of DSV, and output;
Tracer signal modulator 30, the code commands that above-mentioned DSV is minimum is modulated into tracer signal and record.
As shown in Figure 2, above-mentioned code commands generator 10 comprises: totalizer (augmentor) 100, several NRZI code encoder (101～116);
Above-mentioned code commands selector switch 20 comprises: several code reservoirs (201
1～216
1) and DSV storage/calculating part (202
1～216
2) and selection portion (220).
Above-mentioned totalizer (augmentor) 100, digital command with a mutually different location number, for example, the 4 bit digital order (T=0000 that will have nothing in common with each other, 0001...1111), be configured in any one part in front end, middle-end or the rear end of above-mentioned data command, produce mutually different 16 intermediate sequences;
Above-mentioned NRZI code encoder 101～116, carry out the nrzi encoding running, promptly express, with ' 0 ' of 2 systems record, in recording medium without any variation, with ' 1 ' of 2 systems record, migration in the opposite direction in recording medium is exported each code commands for above-mentioned several intermediate sequences with this;
The code reservoir 201 that above-mentioned code commands selector switch 20 comprises
1～216
1, above-mentioned code commands generator 10 is produced and output, mutually different code commands sequence interim the storage;
Above-mentioned DSV storage/calculating part 201
2～216
2, be accumulated to corresponding to after on the flip-flop accumulated value of before code commands being stored temporarily in flip-flop in the above-mentioned code reservoir corresponding to the current code order, export the current DSV value of its accumulation;
Above-mentioned selection portion 220 is with above-mentioned DSV storage/calculating part 201
1～216
1Calculate, the current DSV of output, that is, and be stored in 16 code reservoirs, for 16 DSV of each code commands, compare, select a minimum code commands of DSV value therein and export.
The code commands that the DSV value is minimum will be selected and output to above-mentioned tracer signal modulator 30, and the result can obtain the minimum code commands of flip-flop, to be suitable for modulation signal record, the storage of recording medium.
But, if select code commands by said process, also might take place, the unlimited many situations of continuous ' 0 ' number between ' 1 ' and ' 1 ' at this moment, can exist in the data bit train of above-mentioned code commands, the long-time unconverted interval of the play signal rank of from recording medium, reading, therefore, this interval phaselocked loop (PLL) is play running and become unstable, the problem that the data playback running can take place normally to carry out.
Summary of the invention
For solving the shortcoming of prior art, the invention provides a kind of device and method that a series of data command is converted to modulation signal: during the code commands promptly selecting to write down on the recording mediums such as disk, photomagneto disk or CD, be not only digital sum value (DSV), and in the data bit train of code commands between ' 1 ' and ' 1 ' continuous ' 0 ' number also restricted, thereby can keep the stability that phaselocked loop (PLL) plays and the normality of data playback running.
In order to achieve the above object, the present invention adopts following technical scheme:
Of the present invention a series of data command is converted to the device of modulation signal, is characterized in, comprising:
Sequence produces instrument, behind the additional digital command that has nothing in common with each other on the data command of input, produces several code commands sequences with certain decoding process decoding;
Numeral adds up to the calculation instrument, will the digital sum value (Digital Sum Value-DSV) of several code commands sequences be calculated;
Penalties (penalty) computational tool calculates in several code commands sequences of described generation the penalties (penalty) of ' 0 ' number that exists between continuous ' 1 ' in each;
The selection tool of code commands sequence, and according to above-mentioned obtain between the digital sum value that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
Of the present invention a series of data command is converted to the method for modulation signal, is characterized in, comprising:
Phase one, behind the additional digital command that has nothing in common with each other on the data command of input, with fixed coded system coding and produce several code commands sequences;
Subordinate phase, will to the digital sum value (Digital SumValue-DSV) of several code commands sequences of above-mentioned generation when calculating with in each between continuous ' 1 ' penalties (penalty) of ' 0 ' number calculate;
Phase III, according to above-mentioned obtain between the digital sum value (DSV) that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
Description of drawings
Fig. 1 is the structured flowchart that data command is converted to the device of modulation signal;
Fig. 2 is converted to the code commands generator in the device of modulation signal and the structured flowchart of code commands selector switch with data command;
Fig. 3 is the code commands generator in the device that data command is converted to modulation signal of the present invention and the structured flowchart of code commands selector switch.
Embodiment
For achieving the above object, of the present invention a series of data command is converted to the device of modulation signal, be characterized in, comprising:
Sequence produces instrument, behind the additional digital command that has nothing in common with each other on the data command of input, produces several code commands sequences with certain coded system coding;
Numeral and computational tool will calculate numeral and (the Digital Sum Value-DSV) of several code commands sequences;
Penalties (penalty) computational tool calculates for several code commands sequences of above-mentioned generation, the penalties (penalty) of ' 0 ' number that exists between continuous ' 1 ' in each;
The selection tool of code commands sequence, according to above-mentioned obtain between the digital sum value that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
Of the present invention a series of data command is converted to the method for modulation signal, is characterized in, comprising:
Phase one, behind the additional digital command that has nothing in common with each other on the data command of input, produce several code commands sequences with certain coded system coding;
Subordinate phase to digital sum values above-mentioned generation, several code commands sequences (Digital Sum Value-DSV) when calculating, is calculated in each the penalties (penalty) of ' 0 ' number between continuous ' 1 ';
Phase III, according to above-mentioned obtain between the digital sum value (DSV) that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
Further specify device and the method that a series of data code is converted to modulation signal of the present invention below in conjunction with accompanying drawing and preferred embodiment.
As shown in Figure 1, the data-modulated device among the present invention comprises: the code commands generator; The code commands selector switch; The tracer signal modulator.
As shown in Figure 3, code commands generator 10 comprises:
Totalizer (augmentor) 100, several NRZI code encoder 101～116;
Code commands selector switch 20 comprises:
The totalizer of code commands generator 10 (augmentor) 100, digital command with a mutually different location number, for example, the 4 bit digital order (T=0000 that will have nothing in common with each other, 0001...1111), be configured in any one part in front end, middle-end or the rear end of above-mentioned data command, produce mutually different 16 intermediate sequences; Above-mentioned NRZI code encoder 101～116, as shown in Figure 1, carry out the nrzi encoding running, output is corresponding to each code commands of above-mentioned several intermediate sequences;
The code reservoir 501 that code commands selector switch 50 comprises
1～516
1, above-mentioned code commands generator 10 is produced and output, mutually different code commands sequence interim the storage; Digital sum value (DSV) storage/calculating part 501
2～516
2To be stored temporarily in code reservoir 501
1～516
1, corresponding to the flip-flop of current code order, be accumulated on the flip-flop accumulated value corresponding to code commands before, export the current digital sum value (DSV) of its accumulation.
Penalties (penalty) calculating part 501
3～516
3 Selection portion 520 is selected the data bit train of any one code commands of output and the data bit train of the interim current code order that stores of code reservoir, confirm continuously and calculate before during continuous data between code commands and the current code order ranks, ' 0 ' of existence number penalties (penalty) between ' 1 ' and ' 1 '.For example, with ' 0 ' the number K that exists between continuous ' 1 ', with prior fixed first, second reference value (n, m, 0＜n＜m) compare, if above-mentioned ' 0 ' number K again less than the second reference value m, then is multiplied by the first weighted value a greater than first reference value n on its number K n of ' 0 '; If above-mentioned ' 0 ' number K greater than the above-mentioned second reference value m, then on its number K m of ' 0 ', be multiplied by second weighted value (behind the b, a＜b), with itself and, calculate and output as the penalties (penalty) of respective code order.
Give one example, the data bit train of supposing code commands is ' 1001000010000001 '; First reference value n=3; The second reference value m=5; First, second weighted value is respectively a=0.3, b=0.7, penalties (penalty) calculating part detects ' 0 ' the number K that exists between continuous ' 1 ' for ' 2 ', ' 4 ', ' 6 ' and confirms, greater than n=3,, be multiplied by weighted value a=0.3 to above-mentioned less than the K=' 4 ' of m=5; To above-mentioned K=' 6 ' greater than m=5, be multiplied by a=0.7, therefore, the penalties of final above-mentioned code commands (penalty) calculates and output penalties (penalty) K=aKn+bKn=0.3 * 4+0.7 * 6=5.4.
Above-mentioned first, second reference value and first, second weighted value (a, b), can set changeably arbitrarily by design record Design of device person, also can, utilize, exist a maximum penalties K of number of ' 0 ' to calculate, export penalties (penalty) K between continuous ' 1 ' in the data bit train of above-mentioned code commands.
In addition, digital sum value (DSV) storage/calculating part 501
2～516
2,,, export current digital sum value (DSV) value after its accumulation with digital sum value (DSV) accumulation of the flip-flop accumulated value of code commands before with the flip-flop of the interim current code order that stores of code reservoir.
Be that selection portion 520 is with digital sum value (DSV) storage/calculating part 501
2～516
2And penalties (penalty) calculating part 501
3～516
3The digital sum value (DSV) and the penalties (penalty) that calculate, export add, and select a code commands and the output of its addition calculated value minimum; 30 pairs of flip-flops of tracer signal modulator are few, ' 0 ' the also few code commands of number that exists between continuous ' 1 ' in ranking of code order data simultaneously, carry out modulation signal and handle, thereby can be recorded on the recording mediums such as disk, photomagneto disk or CD.
More than, described embodiments of the invention launch for its intended purposes, know those skilled in the art and can carry out multiple improvement, change, substitute or add in the technological thought and its technical scope that claim is told about.
The invention relates to and a kind of a series of data command is converted to the device of modulation signal and method.Behind the additional digital command that has nothing in common with each other on the data command of input, with NRZI etc. fixed coded system separate and compile and produce several code commands sequences, the digital sum value (Digital Sum Value--DSV) of several code commands sequences is calculated in each the penalties (penalty) of ' 0 ' number between continuous ' 1 ' when calculating, select the relative minimum code commands sequence of the digital sum value (DSV) that calculates with penalties (penalty) sum, code commands sequence as record, therefore, be chosen in disk, photomagneto disk, or during the code commands that writes down on the recording medium such as CD, be not only digital sum value DSV, in the data bit train of code commands between ' 1 ' and ' 1 ' continuous ' 0 ' number also restricted, thereby keep the stability that PLL plays and the normality of data playback running.
Claims (9)
1. one kind is converted to the device of modulation signal with a series of data command, it is characterized in that, comprising:
Sequence produces instrument, behind the additional digital command that has nothing in common with each other on the data command of input, produces several code commands sequences with certain decoding process decoding;
Numeral and computational tool will calculate the digital sum value (Digital Sum Value-DSV) of several code commands sequences;
Penalties (penalty) computational tool calculates in several code commands sequences of described generation the penalties (penalty) of ' 0 ' number that exists between continuous ' 1 ' in each;
The selection tool of code commands sequence, according to above-mentioned obtain between the digital sum value that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
2. as claimed in claim 1 a series of data command is converted to the device of modulation signal, it is characterized in that described sequence produces instrument, comprising:
Totalizer (augmentor), the additional N bit digital order that has nothing in common with each other on the data command of input;
The NRZI code encoder is encoded several sequences after the described additional character order in the NRZI mode, produce 2
NIndividual code commands sequence.
3. the device that a series of data command is converted to modulation signal as claimed in claim 1, it is characterized in that, described penalties (penalty) computational tool, to select the code commands sequence of output and current code command sequence before in each continuous position, ' 0 ' the number that exists between continuous ' 1 ' is compared with mutually different plural reference value, according to the additional respectively mutually different weighted value of its reference value, afterwards its value is added, calculate and output as the penalties (penalty) of ' 0 ' number of each code commands sequence.
4. the device that a series of data command is converted to modulation signal as claimed in claim 1, it is characterized in that, described selection tool with the relative minimum code commands sequence with penalties (penalty) sum of the described digital sum value that calculates, is elected the code commands sequence of record as.
5. a series of data command is converted to the method for modulation signal, it is characterized in that, comprising:
Phase one, behind the additional digital command that has nothing in common with each other on the data command of input, with fixed coded system coding and produce several code commands sequences;
Subordinate phase, will to the digital sum value (Digital SumValue-DSV) of several code commands sequences of above-mentioned generation when calculating with in each between continuous ' 1 ' penalties (penalty) of ' 0 ' number calculate;
Phase III, according to above-mentioned obtain between the digital sum value (DSV) that comes and the penalties (penalty) with, a code commands sequence is elected as the code commands sequence of record.
6. as claimed in claim 5 a series of data command is converted to the method for modulation signal, it is characterized in that being that the described phase one is the additional N bit digital order that has nothing in common with each other on the data command of input, encodes in the NRZI mode, produces 2
NIndividual code commands sequence.
7. the method that a series of data command is converted to modulation signal as claimed in claim 5, it is characterized in that, described subordinate phase, the code commands sequence and the current code command sequence of output will be selected before, in each continuous position, ' 0 ' the number that exists between continuous ' 1 ', compare with mutually different plural reference value, according to the additional respectively mutually different weighted value of its reference value, afterwards its value is added, calculate and output as the penalties (penalty) of ' 0 ' number of each code commands sequence.
8. the method that a series of data command is converted to modulation signal as claimed in claim 5, it is characterized in that, the described phase III,, elect the code commands sequence of record as with the relative minimum code commands sequence of digital sum value that aforementioned calculation is come out with penalties (penalty) sum.
9. described a series of data command is converted to the method for modulation signal as claim 5,6,7 or 8, it is characterized in that, will be converted to modulation signal and record with the code commands sequence that said method is selected.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA031160662A CN1534661A (en) | 2003-03-28 | 2003-03-28 | Device for converting series of data command into modulation signal and its method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA031160662A CN1534661A (en) | 2003-03-28 | 2003-03-28 | Device for converting series of data command into modulation signal and its method |
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| CN1534661A true CN1534661A (en) | 2004-10-06 |
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| CNA031160662A Pending CN1534661A (en) | 2003-03-28 | 2003-03-28 | Device for converting series of data command into modulation signal and its method |
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