CN1591657A - Error correcting device and method - Google Patents
Error correcting device and method Download PDFInfo
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- CN1591657A CN1591657A CN 03150602 CN03150602A CN1591657A CN 1591657 A CN1591657 A CN 1591657A CN 03150602 CN03150602 CN 03150602 CN 03150602 A CN03150602 A CN 03150602A CN 1591657 A CN1591657 A CN 1591657A
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Abstract
The present invention relates to an error correction device and its method. The playback data with NRZ format can be demodulated by demodutation and error signal generation unit, when the error is produced, the demodulation error signal can be generated; according to the generated demoulation error signal the PI decoder can generate eraser polynominal, said eraser polynominal can be used as error position initial value to make PI error correction and generate PI decode data, if the PI error is not corrected, the PI error signal can be generated; according to the PI signal generated by PI decoder the PO decoder can generate eraser polynominal, said eraser polynominal can be used as initial value of error position polynominal to correct PO error and generate PO decode data, if the PO error is not corrected, the PO error signal can be generated; PO decode data can be browsed by browser; the error detection code EDC check unit can be used to check that EDC error is existed or not and correct EDC data output unit, and can use the output of output signal of EDC check unit as optical disk playback data.
Description
(1) technical field
The present invention relates to correct a kind of error correction device and the method for the error in data of DVD dvd playback such as (Digital video Disc).
(2) background technology
DVD CDs such as (Digital video Disc) can the recording played appointment numeral, literal, figure, sound, and dynamic image.In addition, what DVD used is the recording digital code mode, constantly plays the data of record, does not also worry corrupt data and image quality, is a kind of in the outstanding recording medium.
Use the video disc recording of the equipment such as DVD player of such CD to play machine, on CD, write down specific data by light picker, and the specific data of record is play in output.
The specific data record surface of the CD that has just bought is clean, so during dvd playback machine played data, produces mistake hardly.But, if CD is not placed on keeping in the CD keeping box, being placed on for a long time when outer, data recording surface can be stained with foreign matters such as dust, or is used and improper storage, causes the record surface damage.If the broadcast record surface of CD is polluted by dust etc. or when scratching, the playback error that light picker can not correctly be play can take place.
So, for error correction data, the correct broadcast, prevent that CD is by generation playback error such as foreign matter scuffings, video disc recording is play machine when the CD identifying recording layer, inserts the appointment error correction symbol that needs record data earlier, and this is inserted the data of error correction symbol, suitably be modulated at after the CD, be recorded on the CD.
When broadcast was recorded in data on the CD, light picker was read optical disc data, after the data demodulates of reading, utilized the error correction symbol of inserting, and corrected a mistake.
Fig. 1 is the structural drawing of existing error correction device.
As shown in the figure, change NRZI (NON RETURN TO ZERO INVERTED) format record in optical disc data with non-return-to-zero, carrying out light by light picker/high frequency handling part 100 picks up, and carry out the played data that non-return-to-zero NRZ (NON RETURN TO ZERO) form is exported in high frequency treatment reason back, the NRZ formatted data of broadcast is input to demodulation section 110 and carries out demodulation.
The structure of above-mentioned demodulation section 110 as shown in Figure 2, a plurality of comparer 112-1～112-n of comparing section 112 relatively are kept at the NRZ pattern of storer 111 and the played data pattern of NRZ form separately, two comparers output noble potentials that value is the same.The output signal of above-mentioned a plurality of comparer 112-1～112-n is to be added to Port Multiplier 114 to select control signal to draw, Port Multiplier 114 is selected to export in a plurality of demodulating datas of the demodulating data table that is kept at storer 113 in advance, is equivalent to a demodulating data of above-mentioned NRZ form played data.
For example, when the non-return-to-zero NRZ form played data that is input to demodulation section 110 from light picker/high frequency handling part 100 is assumed to be ' 0010000000001001 ', first comparer 112-1 output noble potential among a plurality of comparer 112-1～112-n.According to the noble potential of its first comparer 112-1 output, Port Multiplier 114 selects ' 00000000 ' to be output as demodulating data from the demodulating data table that is kept at storer 113.At this moment, in the NRZ pattern of the NRZ pattern list modular lattice that is kept at storer 111, during not consistent pattern, be to have produced mistake in the dvd playback process with the played data of above-mentioned NRZ form.Demodulation section 110 is the played data of the above-mentioned NRZ form of demodulation correctly, and there is wrong demodulating data in output.
From the demodulating data of above-mentioned demodulation section 110 outputs, be input to PI (PRODUCT INNER) demoder 120 and correct the PI mistake.Above-mentioned PI demoder 120, ECC (ERROR CORRECTIONCODE) blocks of data as Fig. 3 promptly utilizes the data of column direction 172 bits, increases by 10 bit PI odd evens, become 208 line data of 182 bits, when in 182 bits of decoding RS (REED SOLOMON) (182,172,11) mistake below 5 being arranged with the REEDSOLOMON decoding, complete mis repair, if have more than 6 when wrong, can not mis repair, generate the PI rub-out signal.
The structure of above-mentioned PI demoder 120 as shown in Figure 4, the demodulating data of above-mentioned demodulation section 110 is input to the sub-calculating part 121 of check of PI demoder 120, calculates check; The check subvalue who utilizes the sub-calculating part 121 of check to calculate is by error location polynomial calculating part 122 generation error position polynomial expressions; The error location polynomial that utilizes error location polynomial calculating part 122 to generate is by improper value polynomial computation portion 123 miscount values; According to the improper value that calculates, from search for errors portion 124 Search Errors; Correct the PI mistake in error correction portion 125, and output PI decoded signal, at this moment, when having mistake below 5 in the demodulating data, the PI decoded data that output is repaired fully.If can not mis repair when having wrong more than 6, generate the PI rub-out signal.
From the PI decoded data and the PI rub-out signal of above-mentioned PI demoder 120 outputs, be input to PO (PRODUCTOUTER) demoder 130 and correct the PO mistake.Above-mentioned PO demoder 130 utilizes the ECC blocks of data of above-mentioned Fig. 3 to be, increase by 182 data that are listed as of 208 bits of 16 bit PI odd evens on line direction 192 Bit datas, decoding RS (208,192,17) REED SOLOMON demoder, by complete mis repair when wrong below 8,9 can not mis repair when above, generates the PO rub-out signal.In addition, PO demoder 130 during from PI demoder input PI rub-out signal, utilizes its PI rub-out signal on the characteristics of REED SOLOMON demoder, can repair 16 mistakes.
The structure of above-mentioned PO demoder 130 as shown in Figure 5, be input to the sub-calculating part 131 of check of PO demoder 130 by the PI decoded data of PI demoder 120 outputs, calculate check, be input to the eraser polynomial computation portion 132 of PO demoder 130 by the PI rub-out signal of PI demoder 120 output, generate the eraser polynomial expression.
At this moment, if there is not the PI rub-out signal, eraser polynomial computation portion 132 does not generate the eraser polynomial expression.
The eraser polynomial expression that check that the sub-calculating part 131 of above-mentioned check calculates and above-mentioned eraser polynomial expression 132 generate is input to error location polynomial calculating part 133 and calculates, generation error position polynomial expression.At this moment, error location polynomial calculating part 133 produces mistake at PI demoder 120, when eraser polynomial computation portion 132 generates the eraser polynomial expression, the initial value of eraser polynomial expression, generate and to repair the error location polynomial of 16 mistakes at most with error location polynomial; If when eraser polynomial computation portion 132 did not generate the eraser polynomial expression, check that only utilizes the sub-calculating part 131 of check to calculate generated and can repair the error location polynomial of 8 mistakes at most.
The error location polynomial that utilizes above-mentioned error location polynomial calculating part 133 to generate, improper value polynomial computation portion 134 miscount values.According to improper value, search for errors portion 135 Search Errors are corrected the PO mistake in error correction portion 136, output PO decoded data.At this moment, when the mistake that exists in the demodulating data can be repaired, the PO decoded data that output is repaired fully if exist can not mis repair the time, generated the PO rub-out signal.
The PO decoded data of above-mentioned PO demoder 130 outputs is input to CD brewser 140, browses CD, and EDC checks portion 150 and checks the wrong back (played data signal or EDC rub-out signal) that whether exists, and by data output section 160, exports with the dvd playback signal.
Such prior art is in the played data of demodulation section 110 demodulation NRZ forms, the pattern of the played data of NRZ form is kept in several patterns of storer 111 with the NRZ pattern list, when not consistent with one, the vicious demodulating data of demodulation section 110 outputs, and the PI demoder does not know whether there is mistake in the demodulating data of above-mentioned demodulation section 110 outputs, just carries out the PI decoding.
Above-mentioned PI demoder 120 (REED SOLOMON demoder) if when time, ratio was not known mistake in the known error position, can be corrected more mistake on its characteristics.
But above-mentioned existing technology in the played data of above-mentioned demodulation section 110 demodulation NRZ forms, when outputing to PI demoder 120, is not told wrong whether the generation, and therefore when PI demoder 120 was corrected a mistake, existence is the problem of error correction on a small quantity.
(3) summary of the invention
The purpose of this invention is to provide, when the played data of demodulation NRZ form,, just can generate a kind of error correction device and the method for demodulation rub-out signal if when the pattern consistent with the pattern of NRZ form played data not being kept at the NRZ pattern list of storer.
Another object of the present invention provides, the demodulating data of PI demoder input, when carrying out the PI correction, generate the eraser polynomial expression with the demodulation rub-out signal, the error location polynomial calculating part is with this eraser polynomial expression initial value, generation error position polynomial expression improves a kind of error correction device and method in the error correcting capability of PI demoder.
The object of the present invention is achieved like this:
A kind of error correction device, it comprises:
Light picker/high frequency handling part picks up carrying out light with non-return-to-zero conversion NRZI format record in optical disc data, and carries out the played data of high frequency treatment reason back output non-return-to-zero NRZ pattern;
Demodulation and rub-out signal generating unit, demodulation be from the played data of the NRZ form of dvd playback, if generate the demodulation rub-out signal when making a mistake;
The PI demoder, the demodulation rub-out signal according to above-mentioned demodulation and the generation of rub-out signal generating unit generates the eraser polynomial expression, correct the PI mistake with the initial value that its eraser polynomial expression is an error location polynomial, generate the PI decoded data,, generate the PI rub-out signal if when failing to correct the PI mistake; And
The PO demoder, the PI rub-out signal according to above-mentioned PI demoder output generates the eraser polynomial expression, with the wrong initial value that this eraser polynomial expression is an error location polynomial, correct the PO mistake, generate the PO decoded data, when correcting the PO mistake if fail, generate the PO rub-out signal.
A kind of error correction method that utilizes described error correction device to carry out, it comprises:
The 1st step, demodulation and rub-out signal generating unit, demodulation when the demodulation mistake takes place, generates the demodulation rub-out signal from the data of dvd playback;
The 2nd step checks sub-calculating part to import the data of the dvd playback of demodulation in above-mentioned the 1st step, calculates check;
The 3rd step, in above-mentioned the 1st step, when the demodulation rub-out signal had taken place, the eraser polynomial expression calculated in eraser polynomial computation portion;
The 4th step, in above-mentioned the 3rd step, when calculating the eraser polynomial expression, the error location polynomial calculating part is an initial value with the polynomial value of its eraser, calculates, according to the error correction polynomial expression of check that calculates in the 2nd step;
The 5th step in the 3rd step and the 4th step, according to the wrong polynomial value of calculating, is carried out the PI error correction; And
The 6th step in above-mentioned the 5th step, to the data of PI error correction, is carried out the PO decoding with the PO demoder.
Effect of the present invention:
Aforesaid error correction device of the present invention and method are whether when the played data of the NRZ of demodulation dvd playback form, judging has the demodulation mistake, if during wrong generation, generate the demodulation rub-out signal, with this demodulation rub-out signal, the PO demoder generates the eraser polynomial expression, corrects the PI mistake.Therefore the present invention has the effect of the error correcting capability that improves the PI scrambler.
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 structural drawing of existing error correction device;
Fig. 2 is the detailed structure view of the demodulation section among Fig. 1;
Fig. 3 is the pie graph of error correcting with the ECC blocks of data;
Fig. 4 is the detailed structure view of the PI demoder among Fig. 1;
Fig. 5 is the detailed structure view of the PO demoder among Fig. 1;
Fig. 6 is an error correction device structural drawing of the present invention;
Fig. 7 is the demodulation among Fig. 6 and the detailed structure view of rub-out signal generating unit;
Fig. 8 is the detailed structure view of the PI demoder among Fig. 6;
Fig. 9 is the signal flow graph of error correction method of the present invention.
The symbol description of pith in the accompanying drawing:
200: light picker/high frequency handling part 210: demodulation and rub-out signal generating unit
211,213: storage 212: comparing section
214: Port Multiplier 220:PI demoder
221: check sub-calculating part 222: eraser polynomial computation portion
223: error location polynomial calculating part 224: improper value polynomial computation portion
225: search for errors portion 226: error correction portion
230:PO demoder 240: CD brewser
250:EDC checks portion 260: data output section
(5) embodiment
Following with reference to accompanying drawing 6 to Fig. 9, describe the embodiment of error correction device of the present invention and method in detail.
Fig. 6 is the structural drawing of error correction device of the present invention.As shown in the figure, error correction device comprises:
Light picker/high frequency handling part 200 is play the data that write down on the CD, the played data of output NRZ form; Demodulation and rub-out signal generating unit 210, the above-mentioned light picker of demodulation/high frequency handling part 200 when making a mistake, generate demodulation rub-out signal (when not making a mistake, the generating solution adjusting data) from the played data of the NRZ pattern of dvd playback; PI demoder 220, demodulation rub-out signal according to above-mentioned demodulation and 210 generations of rub-out signal generating unit, the initial value that generates the eraser polynomial expression and be error location polynomial with this eraser polynomial expression, correct the PI mistake, generate the PI decoded data, when correcting the PI mistake if fail, generate PI rub-out signal PO demoder 230, according to the PI rub-out signal of above-mentioned PI demoder 220 outputs, generate the eraser polynomial expression, with this eraser polynomial expression wrong initial value that is error location polynomial, correct the PO mistake, generate the PO decoded data,, generate the PO rub-out signal if when failing to correct the PO mistake; CD brewser 240, the PO decoded data of above-mentioned PO demoder 230 generations, according to the PO rub-out signal, browse CD EDC and check portion 250, check in the output signal of above-mentioned CD brewser 240 and have or not the EDC mistake, correct EDC, if when the EDC that fails corrects, generate EDC rub-out signal and data output section 260, above-mentioned EDC is checked the signal of portion's 250 outputs and export with the dvd playback data.
The structure of above-mentioned demodulation and error message generating unit 210 comprises as shown in Figure 7:
The 1st storer 211, the NRZ pattern list of several NRZ patterns that prestore; Comparing section 212, the pattern of several NRZ patterns of the NRZ pattern list that is kept at above-mentioned the 1st storer 211 and above-mentioned NRZ form played data, 212-1～212-n compares one by one with several comparers; The 2nd storer 213, the demodulating data table of a plurality of demodulating datas that prestore; Port Multiplier 214 is pre-stored in several data of demodulating data table of above-mentioned the 2nd storer 213, selects one to select output according to above-mentioned comparing section 212 output signals with demodulating data; The signal of several comparers 212-1～212-n of above-mentioned comparing section 212, NOR-logic is added up, and the rejection gate (noah gate) 215 that generates the demodulation rub-out signal constitutes.
The structure of above-mentioned PI demoder 220 comprises as shown in Figure 8:
Check sub-calculating part 221,, calculate check from demodulation and rub-out signal generating unit 210 input demodulating datas; The eraser polynomial expression according to the demodulation mistake from above-mentioned demodulation and rub-out signal generating unit 210 input demodulation rub-out signals, calculates in eraser polynomial computation portion 222; Error location polynomial calculating part 223, the eraser polynomial expression that sub-result of check who calculates according to the sub-calculating part of above-mentioned check 221 and above-mentioned eraser polynomial computation portion 222 generate, generation error position polynomial expression; Improper value polynomial computation portion 224 detects improper value according to above-mentioned error location polynomial calculating part 223 generation error position polynomial expressions; Search for errors portion 225 is according to the output signal Search Error of above-mentioned improper value polynomial computation portion 224; The PI mistake is corrected according to the output signal of above-mentioned search for errors portion 225 by error correction portion 226, and the PI decoded data is outputed to PO demoder 230, if when failing to correct the PI mistake, the PI rub-out signal is outputed to PO demoder 230.
What so constitute is that light picker/high frequency handling part 200 picks up with high frequency and handles with the data of NRZ format record on CD, and the played data of NRZ form is outputed to demodulation and rub-out signal generating unit 210 about error correction device of the present invention.
Above-mentioned demodulation and rub-out signal generating unit 210, pattern from the NRZ form played data of several NRZ patterns of the NRZ pattern list that is pre-stored in the 1st storer 211 and above-mentioned light picker/high frequency handling part 200 inputs, several comparers 212-1～212-n with comparing section 212 compares separately, export two comparer output noble potentials that value is the same, the output signal of above-mentioned several comparers 212-1～212-n is added to Port Multiplier 214 to select control signal to draw, Port Multiplier 214 selects output to be equivalent to a demodulating data of the played data of above-mentioned NRZ form from several demodulating datas of the demodulating data table that is pre-stored in the 2nd storer 213.
In addition, rejection gate (noah gate) 215 NOR-logic are added up, and the output signal of above-mentioned several comparers 212-1～212-n is output as the demodulation rub-out signal.Promptly, be kept in several NRZ patterns of NRZ pattern list of the 1st storer 211, when the pattern of the pattern and the played data of above-mentioned NRZ form is consistent, among several comparers 212-1～212-n of comparing section 212, a comparer output noble potential of above-mentioned pattern unanimity, rejection gate (noah gate) 215 output electronegative potentials, illustrating does not have mistake.If be kept in several NRZ patterns of NRZ pattern list of the 1st storer 211, during not consistent pattern with the played data of above-mentioned NRZ form, several comparers 212-1～212-n of comparing section 212 all exports electronegative potential, rejection gate (noah gate) 215 output noble potential demodulation rub-out signals illustrate to have the demodulation mistake.
The demodulating data and the demodulation rub-out signal of above-mentioned demodulation and 210 outputs of rub-out signal generating unit are input to PI demoder 220.PI demoder 220 is, check the demodulating data of the above-mentioned detuner 210 of sub-calculating part 221 inputs to calculate check, the demodulation rub-out signal of eraser polynomial computation portion 222 input detuners 210, when if the demodulation mistake is arranged, generate the eraser polynomial expression, if when not having the demodulation mistake, do not generate the eraser polynomial expression.The eraser polynomial expression that the sub and above-mentioned eraser polynomial computation of the check portion 222 that the sub-calculating part 221 of above-mentioned check calculates generates is input to error location polynomial calculating part 223, generation error position polynomial expression.At this moment, error location polynomial calculating part 223, in demodulation and rub-out signal generating unit 210, generation error, when if eraser polynomial computation portion 221 generates the eraser polynomial expression, with the initial value that its eraser polynomial expression is an error location polynomial, generate and to correct the error location polynomial of 16 mistakes at most.If eraser polynomial computation portion 222, when not generating the eraser polynomial expression, check that only utilizes the sub-calculating part 221 of check to calculate, generation can be corrected the error location polynomial of 8 mistakes at most.
The error location polynomial that above-mentioned error location polynomial calculating part 223 generates is input to improper value polynomial computation portion 224, and the miscount value by search for errors portion 225 Search Errors, is corrected the PI mistake in error correction portion 226, output PI decoded data.During error correction, generate the PI rub-out signal if fail.
From above-mentioned PI demoder 220, PI decoded signal to the output of PI error correcting, be input to PO demoder 230 and carry out the PO decoding, the PO decoded data of PO decoding, be input to CD brewser 240, browse CD, after EDC checks portion 250 and checks wrong whether the existence, export the dvd playback signals by data output section 260.
Fig. 9 is the signal flow graph of error correction method of the present invention.(simultaneously referring to Fig. 6) as shown in the figure:
Flow process begins.
In step 300, light picker/high frequency handling part 200 is play the specific data that is recorded on the CD, demodulation and rub-out signal generating unit 210 its played data of input.
Carry out demodulation in step 302.
Whether the demodulation mistake of judging played data in step 304 generates.
In step 306,, generate the demodulation rub-out signal if when having generated the demodulation mistake.1
In step 308, demodulating data when sub-calculating part 221 inputs of the check of PI demoder 220 do not make a mistake, the son of testing calculates, in step 308, the above-mentioned demodulation rub-out signal of eraser polynomial computation portion 222 inputs of PI demoder 220, judge in the demodulation of played data, whether mistake has taken place.
In step 310, judge when The above results has generated the demodulation mistake that the eraser polynomial expression calculates in step 312 in above-mentioned eraser polynomial computation portion 222.
In step 314, error location polynomial calculating part 223 is an initial value with above-mentioned eraser polynomial expression, calculates the error location polynomial polynomial expression according to above-mentioned check.
In step 316, if in above-mentioned steps 310, judged result, when the demodulation mistake did not take place, the eraser polynomial expression did not calculate in above-mentioned polynomial computation portion 222, by error correction polynomial expression generating unit 223, calculated the error location polynomial according to above-mentioned check.
In step 318, after the calculating of above-mentioned error location polynomial is finished,, carry out the PI error correcting according to the value of its error location polynomial.That is, improper value polynomial computation portion 224, input error position polynomial expression, the miscount value, search for errors portion 225 Search Errors are corrected the PI mistake in error correction portion 226, output PI decoded data.During error correction, generate the PI rub-out signal if fail.
In step 320,, after so the PI decoding was finished, PO demoder 230 input PI decoded data and PI rub-out signals were carried out the PO decoding.
In step 322, CD brewser 240 carries out CD to be browsed.
In step 324, EDC checks portion 250, checks wrong whether the existence, carries out exporting by data output section 260 after EDC corrects.
Flow process finishes.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used 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 modification of the above embodiment.
Claims (6)
1, a kind of error correction device, its feature comprises:
Light picker/high frequency handling part picks up carrying out light with non-return-to-zero conversion NRZI format record in optical disc data, and carries out the played data of high frequency treatment reason back output non-return-to-zero NRZ pattern;
Demodulation and rub-out signal generating unit, demodulation be from the played data of the NRZ form of dvd playback, if generate the demodulation rub-out signal when making a mistake;
The PI demoder, the demodulation rub-out signal according to above-mentioned demodulation and the generation of rub-out signal generating unit generates the eraser polynomial expression, correct the PI mistake with the initial value that its eraser polynomial expression is an error location polynomial, generate the PI decoded data,, generate the PI rub-out signal if when failing to correct the PI mistake; And
The PO demoder, the PI rub-out signal according to above-mentioned PI demoder output generates the eraser polynomial expression, with the wrong initial value that this eraser polynomial expression is an error location polynomial, correct the PO mistake, generate the PO decoded data, when correcting the PO mistake if fail, generate the PO rub-out signal.
2, error correction device as claimed in claim 1 is characterized in that described demodulation and rub-out signal generating unit comprise:
The 1st storer, the NRZ pattern list of described several NRZ patterns that prestore;
Comparing section is with the pattern of more described one by one several NRZ played data of several comparers;
The 2nd storer, several data of the demodulating data table that prestores;
Port Multiplier selects an output signal according to described comparing section with demodulating data in described the 2nd storer, selects output;
Rejection gate, the signal of several comparers of described comparing section, NOR-logic is added up, and generates the demodulation rub-out signal.
3, error correction device as claimed in claim 1 is characterized in that described PI demoder comprises:
Check sub-calculating part,, calculate check from described demodulation and rub-out signal generating unit input demodulating data;
The eraser polynomial expression according to the demodulation mistake from described demodulation and rub-out signal generating unit input demodulation rub-out signal, calculates in eraser polynomial computation portion;
The error location polynomial calculating part, the eraser polynomial expression that the sub and described eraser polynomial computation of the check portion of calculating according to the sub-calculating part of described check generates, generation error position polynomial expression;
Improper value polynomial computation portion, the error location polynomial according to described error location polynomial calculating part generates detects improper value;
Search for errors portion is according to the output signal Search Error of described improper value polynomial computation portion;
The PI mistake is corrected according to the output signal of described search for errors portion by error correction portion, and the PI decoded data is input to the PO demoder, if when failing to correct the PI mistake, the PI rub-out signal is input to the PO demoder.
4, error correction device as claimed in claim 3 is characterized in that described error location polynomial calculating part is, the eraser polynomial expression that described eraser polynomial computation portion is calculated is that the initial value of error location polynomial uses.
5, a kind of error correction method that utilizes error correction device as claimed in claim 1 to carry out, its feature comprises:
The 1st step, demodulation and rub-out signal generating unit, demodulation when the demodulation mistake takes place, generates the demodulation rub-out signal from the data of dvd playback;
The 2nd step checks sub-calculating part to import the data of the dvd playback of demodulation in above-mentioned the 1st step, calculates check;
The 3rd step, in above-mentioned the 1st step, when the demodulation rub-out signal had taken place, the eraser polynomial expression calculated in eraser polynomial computation portion;
The 4th step, in above-mentioned the 3rd step, when calculating the eraser polynomial expression, the error location polynomial calculating part is an initial value with the polynomial value of its eraser, calculates, according to the error correction polynomial expression of check that calculates in the 2nd step;
The 5th step in the 3rd step and the 4th step, according to the wrong polynomial value of calculating, is carried out the PI error correction; And
The 6th step in above-mentioned the 5th step, to the data of PI error correction, is carried out the PO decoding with the PO demoder.
6, error correction method as claimed in claim 5, it is characterized in that in described the 1st step from several data patterns of the data of dvd playback and the NRZ pattern list of described demodulation and rub-out signal generating unit, preserving in advance relatively after, when not having consistent pattern, generate the demodulation rub-out signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB03150602XA CN1333403C (en) | 2003-08-27 | 2003-08-27 | Error correcting device and method |
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|---|---|---|---|
| CNB03150602XA CN1333403C (en) | 2003-08-27 | 2003-08-27 | Error correcting device and method |
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| CN1591657A true CN1591657A (en) | 2005-03-09 |
| CN1333403C CN1333403C (en) | 2007-08-22 |
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| JPH11317674A (en) * | 1998-05-07 | 1999-11-16 | Mitsubishi Electric Corp | Error correction decoding device and its method |
| CN1324602C (en) * | 2000-12-28 | 2007-07-04 | 联发科技股份有限公司 | Disc decoding system and method |
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