CN100533578C - High-density CD error correcting code decoding device and method - Google Patents
High-density CD error correcting code decoding device and method Download PDFInfo
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- CN100533578C CN100533578C CNB2005101124765A CN200510112476A CN100533578C CN 100533578 C CN100533578 C CN 100533578C CN B2005101124765 A CNB2005101124765 A CN B2005101124765A CN 200510112476 A CN200510112476 A CN 200510112476A CN 100533578 C CN100533578 C CN 100533578C
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Abstract
The invention relates to an error correcting code decoding device and correspond method of high-density compact disc, when data flow which is read from high-density compact disc such as blue-disc is demodulated, it is demodulated as set 17PP demodulation mode to definite format; in cause of error correcting code and decoding of data flow which is after demodulation, part of LDC code words and BIS code words are relatively searched to judge whether is there Burst Error; according to the judging result, erasure can be precisely labeled. So, if there is Burst Error in section of middle part of LDC code words to next BIS code words which are adjacent to LDC code words; or there is not Burst Error in LDC code words, but there is Burst Error in two BIS code words which are front of and behind said LDC code words, based on the device and method in the invention, erasure can be labeled in error position to avoid error effectively during the cause of correcting and decoding.
Description
Technical field
The present invention relates to a kind of error correcting code decoding device and correlation method of high density compact disc, particularly, be for to error correcting code decoding device and correlation method from a kind of high density compact disc of carrying out more accurately error correction and decode operation such as the data stream of reading the high density compact discs such as Blu-ray Disc.
Technical background
Generally speaking, can non-volatile recording as Blu-ray Disc etc. and play in the recording medium of voice data of the video data of high image quality and high tone quality, as shown in Figure 1, record the record frame (Recording Frame) of 1288 data bits (Data bits), LDC (LDC:LogDistance) coded word that has 4 38 bits on each record frame, the burst indicator subcode BIS of 31 bytes (BIS:Burst Indicator Subcode), the DC control (Dc-control) of frame synchronization of 20 bits (Frame Sync) and 28 1 bits.
Above-mentioned LDC coded word and BIS coded word use respectively in different Saloman coding (Reed-Solomon) mode: that above-mentioned LDC coded word adopts is RS (248,216,33) coded system, that above-mentioned BIS coded word then adopts is RS (62,30,33) coded system.
Above-mentioned LDC coded word and BIS coded word are used for such as Blu-ray Disc logging machine (BD-Recorder) or Blu-ray Disc player optical disc apparatus such as (BD-player), to the record frame decoding process of reading, play an important role as the coded word of correcting a mistake from CD.
Above-mentioned such as optical disc apparatus such as Blu-ray Disc logging machine or Blu-ray Disc players in, as shown in Figure 2, if mistake appears in the frame synchronization of 20 bits, and also produce mistake in the BIS coded word of its next 1 byte, or in two BIS coded words of adjacency, produce continuously mistake, will be in the LDC coded word between frame synchronization and the BIS coded word, or in the LDC coded word of 38 bytes that exist between the BIS of two appearance mistakes of adjacency burst error (Burst Error) appears, that is, wait the mistake of the certain-length that causes by scraping.For example, occur length continuously and reach the above mistake of 40 bytes.In case judge this kind situation to occur, will correspondingly identify and wipe (Erasure).
Like this,, carry out more accurate error recovery action, then carry out common error recovery action, thereby improved error recovery and decoding efficiency of movement for the LDC coded word of not wiped by sign for above-mentioned LDC coded word of being wiped by sign.
But in general optical disc device, as mentioned above, produce when wrong producing on the BIS coded word of frame synchronization and its next byte to be connected on wrong or two the BIS coded words, will identify the LDC coded word between two BIS coded words of the BIS coded word that is present in above-mentioned frame synchronization and its next byte or adjacency and wipe in adjacency.But, as shown in Figure 3, if length is the burst error of less than 40 bytes, this mistake is present in from the centre position of LDC coded word between the next BIS coded word time, then can not wipe, thereby cause mistake the LDC coded word sign that has above-mentioned burst error.
Perhaps as shown in Figure 4, even on the LDC coded word, there is not burst error, occur also can wiping being present in two LDC coded words signs between the BIS coded word when wrong on two BIS coded words of adjacency, the result leads to errors and corrects and the improper execution of decode operation.
Summary of the invention
Therefore, the present invention is for addressing the above problem, a kind of error correcting code decoding device and corresponding method of high density compact disc are provided, illustrate, the data stream of reading from such as high density compact discs such as Blu-ray Discs is being separated timing, it by the mode of setting in advance, is carried out demodulation as the 17PP demodulation mode; Data stream after demodulation is being carried out in error correcting and the decode procedure, a part and the BIS coded word of LDC coded word are carried out cross reference together, according to whether burst error taking place, more accurately sign is wiped, thereby normally carries out error correction and decode operation.
For achieving the above object, error correction decode method according to high density compact disc provided by the present invention comprises following three steps: first step, the data stream that to read from high density compact disc is demodulated to the specific format that sets in advance, afterwards according to the separately output of data stream after with demodulation of BIS coded word and LDC coded word; Second step after above-mentioned BIS decode codewords, is carried out cross reference to above-mentioned BIS coded word and above-mentioned a part of byte through the LDC of demodulation coded word through decoding, thereby is judged whether to take place burst error; Third step according to the judged result whether burst error take place, carries out to above-mentioned LDC coded word that corresponding error is proofreaied and correct and decoding.
Error correcting code decoding device according to high density compact disc provided by the present invention comprises: the data stream that will read from high density compact disc is demodulated to the specific format that sets in advance, separates the demodulating equipment of output afterwards according to BIS coded word and LDC coded word; The BIS decoding device that the above-mentioned separately BIS coded word of output is decoded; Above-mentioned BIS coded word and above-mentioned a part of byte through the LDC of demodulation coded word through decoding carried out cross reference, thereby judge whether to take place burst error, and then carry out the identity device of wiping that corresponding sign wipes; Wipe according to whether identifying,, carry out neatly that corresponding error is corrected and the LDC decoding device of decoding action at above-mentioned LDC coded word.
Description of drawings
Fig. 1 is the record frame pie graph of common high density compact disc.
Fig. 2 uses conventional method to identify the example schematic diagram of wiping in the LDC coded word.
Fig. 3 and Fig. 4 use commonsense method, identify the example schematic diagram of wiping in the LDC coded word mistakenly.
Fig. 5 is the pie graph of high-density CD error correcting code decoding device provided by the present invention.
Fig. 6 is according to the inventive method, the synoptic diagram of the embodiment that sign is wiped in the LDC coded word.
Fig. 7 is according to the present invention, and in wiping mark part, cross reference goes out the byte location synoptic diagram after the 17PP demodulation.
Fig. 8 is according to the present invention, in wiping mark part, and the 17PP modulation bit transformation rule diagram that cross reference goes out.
Fig. 9 and Figure 10 are according to the present invention, the embodiment synoptic diagram that normal sign is wiped in the LDC coded word.
Embodiment
With reference to the accompanying drawings, the desirable embodiment of the high-density CD error correcting code decoding device that the present invention is realized to foundation is elaborated.
At first, high-density CD error correcting code decoding device provided by the invention and method can be applied to as in the optical disc apparatus such as Blu-ray Disc logging machine or Blu-ray Disc player.Above-mentioned decoding device comprises demodulation section 10 as shown in Figure 5, BIS lsb decoder 11, and LDC lsb decoder 12, and wipe mark part 13.
On the one hand, the data stream that above-mentioned demodulation section 10 will be read from CD is demodulated to the specific format of prior setting, as carrying out demodulation with the 17PP demodulation mode.With BIS coded word and the separately output respectively of LDC coded word.In above-mentioned BIS lsb decoder 11, the BIS coded word that will export from above-mentioned demodulation section 10 is decoded with RS (62,30,33) coded system.
In above-mentioned LDC lsb decoder 12, the LDC coded word of output from above-mentioned demodulation section 10 is carried out corresponding decoding processing with RS (246,216,33) coded system simultaneously.At this moment, wipe in the mark part 13 above-mentioned, with reference to the sign of wiping of carrying out selectively, carry out more accurate error correcting and decoding to identifying the LDC coded word of wiping, then carry out common error correcting and decode operation for the LDC coded word that does not have sign to wipe.
Wipe in the mark part 13 above-mentioned, whether exist mistake to retrieve affirmation in the BIS coded word to output from above-mentioned BIS lsb decoder 11, simultaneously a part of byte in the LDC coded word of output from above-mentioned demodulation section 11 is retrieved and confirmed.Illustrate, as shown in Figure 6, the 19th, 20,58,59,97,98,136,137 bytes of LDC coded word of output from above-mentioned demodulation section 10 are retrieved and confirmed finally confirm whether there is mistake on the respective byte.
According to above-mentioned affirmation result, if have mistake in the corresponding byte, and also produce before this byte or on the BIS coded word thereafter simultaneously when wrong, the above-mentioned mark part 13 of wiping will be wiped occurring identifying on the respective bins of burst error, as shown in Figure 7, be the 221st to 233 bit position before the 17PP demodulation through the position correspondence of the 19th byte after the 17PP demodulation, as shown in Figure 8, if above-mentioned 221 to 233 bit values are not inconsistent with the 17PP modulation bit transformation rule (17PP modulation bit conversion rule) of prior setting, just can judge on the position of corresponding 19 bytes mistake to have occurred.
For another example, be the 233rd to 245 bit position before the 17PP demodulation through the position correspondence of the 20th byte after the 17PP demodulation, as shown in Figure 8, if above-mentioned 233 to 245 bit values are not inconsistent with the 17PP modulation bit transformation rule of prior setting, just can judge on the position of corresponding 20 bytes mistake to have occurred, just can carry out a series of corresponding action afterwards.
In view of the above, as shown in Figure 6, on the position of 19 or 20 bytes of LDC coded word, there is mistake, simultaneously, on its next BIS coded word, mistake also occurs, just can judge on this interval burst error to have occurred, wipe thereby identify.
On the contrary, if on the position of the 58th or the 59th byte of LDC coded word, do not have mistake, even on the BIS of its front and back thereof codeword locations, mistake all occurs so, also can judge on the LDC codeword locations that occurs between two wrong BIS coded words burst error does not take place, not wipe thereby do not identify.
And if on the position of the 97th or the 98th byte of LDC coded word, have mistake, and on the BIS codeword locations of its front and its back mistake appears respectively all also, just can judge in the LDC coded word that all occurs between two wrong BIS coded words to have burst error, wipe thereby can identify.
Have again, if on the position of the 136th or the 137th byte of LDC coded word, do not have mistake, and mistake appears on the BIS of its front codeword locations, then judges on corresponding LDC codeword locations, not have burst error, thereby can not wipe sign.
Promptly, as shown in Figure 9, burst error with 20 byte lengths is example, because the burst error of above-mentioned 20 byte lengths is present in middle part from the LDC coded word to the interval between the next BIS coded word of its adjacency, wipe so partly identify for the above-mentioned LDC coded word that has burst error.Again as shown in figure 10, even in 2 BIS coded words of adjacency, mistake all occurs, and when not having burst error in the LDC coded word between the BIS of above-mentioned two adjacency coded word, can not wipe too the sign of the LDC coded word in the BIS coded word of above-mentioned two adjacency, therefore, above-mentioned LDC lsb decoder 12 is normally carried out corresponding error correction and decoding action according to wiping the sign situation.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention is not limited to the content on the instructions, must determine its technical scope according to interest field.
The effect of invention
The as mentioned above error correcting code decoding device of high density compact disc of the present invention and correlation method are to from such as blue light light The data flow of reading in the high density compact discs such as dish is separated timing, according to the 17PP demodulation mode of prior setting with it Be demodulated to specific format; In that the data flow after demodulation is carried out in error correcting and the decode procedure, with the LDC code The part of word and BIS code word are carried out the reference retrieval together, judge whether to exist burst error, according to judging knot Really, more accurately sign is wiped. Like this, if burst error is present in LDC code word middle part extremely and LDC Interval between the adjacent next BIS code word of code word; Or do not have burst error in the LDC code word, And make a mistake in former and later two BIS code words of above-mentioned LDC code word, according to device provided by the present invention and side Method also can be wiped in the position sign that makes a mistake exactly, thereby prevents from moving in execution error correction and decoding Producing mistake in the journey, is a very practical invention.
Claims (8)
1, a kind of error correction decode method of high density compact disc is characterized in that, may further comprise the steps:
First step: the data stream that will read from high density compact disc is carried out demodulation according to the specific format that sets in advance, afterwards BIS coded word and LDC coded word is separated output;
Second step: after above-mentioned BIS decode codewords, when mistake appears in the 19th or the 20th byte location of above-mentioned each LDC coded word through demodulation, and when the BIS coded word adjacent with this LDC coded word also mistake occurs, then judge in this LDC coded word to have burst error, and this LDC coded word sign is wiped; When mistake does not appear in the 19th or the 20th byte location of above-mentioned each LDC coded word through demodulation, even the BIS coded word adjacent with this LDC coded word occurs also judging in this LDC coded word not have burst error when wrong; Wherein, each LDC coded word is made up of 38 bytes;
Third step:, above-mentioned LDC coded word carried out corresponding error is proofreaied and correct and decoding according to the judged result whether burst error take place.
2, the error correction decode method of high density compact disc as claimed in claim 1 is characterized in that,
In above-mentioned first step, the data stream that will read from Blu-ray Disc is carried out demodulation according to the 17PP demodulation mode, afterwards BIS coded word and LDC coded word is separated output.
3, the error correction decode method of high density compact disc as claimed in claim 1 is characterized in that,
The the 19th or the 20th byte of above-mentioned each LDC coded word if be not inconsistent with the 17PP modulation bit transformation rule of prior setting, then can be judged on its corresponding position mistake to occur.
4, the error correction decode method of high density compact disc as claimed in claim 1 is characterized in that,
In above-mentioned third step, the part that occurs burst error for sign is carried out accurate error-correction operation, carries out common error-correction operation for not identifying the part that burst error occurs.
5, a kind of error correcting code decoding device of high density compact disc is characterized in that, comprising:
The data stream that to read from high density compact disc is carried out demodulation according to setting form in advance, afterwards BIS coded word and LDC coded word is separated the demodulating equipment of exporting;
The BIS decoding device that the above-mentioned separately BIS coded word of output is decoded;
If mistake appears in the 19th or the 20th byte location of above-mentioned each LDC coded word through demodulation, and when the BIS coded word adjacent with this LDC coded word also mistake occurs, then judge in this LDC coded word to have burst error, and this LDC coded word is carried out the identity device of wiping of wiping sign accordingly; Wherein, each LDC coded word is made up of 38 bytes;
According to the positional information that sign is wiped,, carry out the LDC decoding device of corresponding error correction and decode operation neatly at above-mentioned LDC coded word.
6, the error correcting code decoding device of high density compact disc as claimed in claim 5 is characterized in that,
In above-mentioned demodulation means, the data stream that will read from Blu-ray Disc is carried out demodulation according to the 17PP demodulation mode, afterwards BIS coded word and LDC coded word is separated output.
7, the error correcting code decoding device of high density compact disc as claimed in claim 5 is characterized in that,
The the 19th or the 20th byte of above-mentioned each LDC coded word if be not inconsistent with the 17PP modulation bit transformation rule of prior setting, then can be judged on its corresponding position mistake to occur.
8, the error correcting code decoding device of high density compact disc as claimed in claim 5 is characterized in that,
In the LDC decoding device, carry out accurate error-correction operation for identifying the part that burst error occurs, carry out common error-correction operation for not identifying the part that burst error occurs.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1464530A (en) * | 2002-06-14 | 2003-12-31 | 台湾积体电路制造股份有限公司 | Process for making super-thin silicon nitride / silicon oxide grid electrode dielectric layer |
| CN1643598A (en) * | 2002-09-02 | 2005-07-20 | Lg电子株式会社 | Method of correcting data on a high-density recording medium |
| CN1647392A (en) * | 2002-04-05 | 2005-07-27 | 皇家飞利浦电子股份有限公司 | Method and apparatus for embedding an additional layer of error correction into an error correcting code |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1647392A (en) * | 2002-04-05 | 2005-07-27 | 皇家飞利浦电子股份有限公司 | Method and apparatus for embedding an additional layer of error correction into an error correcting code |
| CN1464530A (en) * | 2002-06-14 | 2003-12-31 | 台湾积体电路制造股份有限公司 | Process for making super-thin silicon nitride / silicon oxide grid electrode dielectric layer |
| CN1643598A (en) * | 2002-09-02 | 2005-07-20 | Lg电子株式会社 | Method of correcting data on a high-density recording medium |
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