TWI301615B - Hologram recording and reproducing apparatus and hologram reproducing apparatus - Google Patents

Description

.I3〇i^4fd〇c IX. Description of the invention: [Technical field to which the invention pertains] Invented, the invention relates to a holographic recording and reproducing apparatus, and a type of two-person production, which is used to record (4) The full-image ship offers all the materials and raw materials. More specifically, there is a type of image recording and reproducing apparatus and a holographic apparatus which can reduce decoding errors even when the signal noise ratio due to interference is deteriorated. [Prior Art] _ In recent years, rewritable optical disks such as phase change optical discs and magnet 〇 optical discs have been widely used. In order to increase the recording density of such a disc, a technique for reducing the spot diameter of the beam must be used. This technique can reduce the distance between adjacent magnets, or between adjacent bits, thereby increasing the recording density. The density of such discs is currently increasing year after year. However, the data recording density in this disc plane is limited by the diffraction limit _ (diffractive limit) of the light. Therefore, it is necessary to use a three-dimensional multiple recording method using a disc depth to increase its recording capacity. Since the hologram memory has a three-dimensional recording area to provide a large capacity, and because it uses the currently developing two-dimensional batch recording and reproducing method to provide higher access. speed. Therefore, holographic memory can be used as the next generation of computer memory. In the holographic memory, the object beam and I301^4fd〇c correspond to a reference beam of the recorded material, incident on the recording medium, and two glasses on the recording medium Between the glass plates, a recording layer made of a material such as a photopolymer (ph〇t〇p〇ly_) is inserted. Next, the refractive index (refractiveincJex) of the δ-recorded material is changed by the light beam, and an interference pattern is generated to record the data. Further, by irradiating only the reference beam onto the recording material during the data reproducing operation, the optical material corresponding to the recorded material can be extracted by reproducing the interference pattern. Fig. 1 is a diagram showing a signal processor of a conventional hologram recording and reproducing apparatus. Please refer to Figure 1. The Reed-Solomon enc〇der in the figure encodes the recorded data with a Reed_Sol〇m〇nc〇de and produces a Record Reed_Solomon code b. The block encoder 2 encodes the recorded Reese Solomon code b with a block code and generates a recording block code (rec〇rding bl〇CkC〇de)d. For example, referring to FIG. 2, if b=〇, d can be obtained by the following formula 1. On the other hand, if b = 1, an encoding process using a differential code of d which is entangled by the following formula 2 can be performed. (1) 7 0 1301 (10) pif.doc d = . (2) Referring to FIG. 1, by transmitting in the recording block code d, the target beam corresponding to the pixels of "1", and the intercept corresponding to, The target beam 'space modulator 3' of the pixel of 〇, 会, will generate recording-page data to indicate a checkered pattern corresponding to the recorded block code d. For example, when d is obtained by the following formula 3, the recorded page data as shown in Fig. 3 is generated. In another method, one of the four pixels is a special code of 1, 1, and the other three pixels, and the code is hereinafter referred to as a 2:4 code (refer to the early disclosure of the patent) Case No. H9-197947). d 0 0 (3) The brightness level of the first column of the graph/scale data (four) gamma (four) is as shown in Fig. 4. Each pixel of the recorded page data is represented by each-corresponding pixel--the individual two-bit substrate is shown as the phase 1, and the holographic recording medium 4 is deposited on the disc material. A photosensitive material (the interference of the Photosensitive beam and the recording material is recorded on the reference beam and the target light when the refractive index of the reference material is changed. By recording the page offset ^ recording 4, it has to correspond to I30l^i4 .fd〇c data). FIG. 5 is a diagram showing the processing of reproducing the page data by recording the recorded page data of the map on the second image 5 recorded medium 4, and reproducing the reproduced page data from the whole image. The brightness level of the pixel represented by the column of the data shown in Fig. 5 is as shown in Fig. 6. The image is: "image_" has continuous multi-valued level =: mutual interference The change in the level of the reproduced signal caused by various interferences such as crosstalk and W image. The mrvt has a CM〇S image sensor (image se) or an optical receiver of the f-CD image sensor (_(10)(4)$, which will convert the reproduction page to photoelectric conversion' to generate a regenerative signal (“Qiu” S = 1) P. The reproduced signal has a continuous multi-value level similar to the luminance level shown in Fig. 6. The block decoder (bl〇ckdec〇to) 6 generates the level P of the signal P. The block code is decoded and a reproduced Reed Solomon code r is generated. ^ In other words, it is assumed that the values of the reproduced signals reproduced from the upper and lower pixels of the optical receiver 5 are pi and p2, if pi &lt P2, if the block is decoded to 6, it will determine that the estimated value of the recorded block code d is obtained by Equation 4, and a regenerative Reed Solomon code of r;=〇 is generated. On the other hand, if Ρι > Μ, then the area The block decoder 6 determines that the estimated value of the recorded block code d is obtained by Equation 5, and produces a reproduced Reed Solomon code of r = 1. The Reed Solomon decoder 7 uses the Reed Solomon code to solve 3 〇 16 ^〇〇 and generate regenerative data (reproducing code regeneration Reed Solomon code r data) s 〇 (4)

cU (5) Knowing the holographic recording and reproducing device, before the Reed Solo II decoding program, the regenerated data ^ must be equal to the 6-recorded tribute & which is quite high, and the Reed Solomon The bit error of the code r must be reduced to less than, for example, about 1χ1〇_4. However, 1x10 in the actual holographic recording and reproduction device towel, regenerative video signal noise ratio (four) nal*nGise, S / N) # often susceptible to such as media noise, _ A, mutual interference between the codes, The influence of various disturbances such as crosstalk, pixel position deviation, and the like. Therefore, there is often a decoding error of the reproduced Reed Solomon code r, and the erroneous material (4) will be reduced. For example, as described above, the individual level of each pixel in the reproduced page data is between black and white. The gray area between the two, and the brightness level of the individual pixels and the level of the reproduction = number will have a continuous multi-value level. Since the block code is decoded only according to the relative level of the reproduced signal having multiple numerical levels, when the level interference of the reproduced signal P causes a large change of the reproduced signal p, a decoding error often occurs. 1301615 16569pif.doc SUMMARY OF THE INVENTION The present invention provides a holographic recording and reproducing apparatus, and a holographic generating apparatus which can use a low-cost parity check (1 〇 ^ d (10) (4) c eck code, LDPC) Code, in the implementation of high-performance decoding procedures, the regenerative signal = number of miscellaneous due to various means (four) correction, improve the rate and higher reliability. s % According to the present invention - the omni-directional recording and reproducing apparatus provided by the present invention comprises: - a low density parity check encoder (9) (10) (10), which is encoded by a low density parity check code. Shima 1 has recorded the material, and produces - record low-density parity check code, ·-block, flat code is 'use-block code, encode low-density parity check code, and generate-record County block code; - a hologram recorder, (hQl hm (10) f (10) pool 哗 U = lt) 'by illuminating the hologram on the target beam, and recording the brood, and the brightness of the target beam is spatially adjusted The device is adjusted according to the recording block code; a hologram reproducing unit, which includes a light receiver, by irradiating a reference beam to the holographic recording medium to read-reproduce the light beam, - reproducing the data and reproducing the data, a block decoder, decoding the reproduced block code corresponding to the recorded block code according to the level of the reproduced signal, and decoding the corresponding low density parity check code according to the reproduced block code regeneration Density parity check horse, and differentiating the estimation data of the individual bit values of the reproduced low density parity check code according to the level of the reproduced signal; and a low-latitude parity check decoder, according to the estimated data, The low density parity check code is decoded to decode the recorded data. I30^l4ifd〇c Verification: According to ΐί 二ΐ奇: degree parity = two even records two === data, the basin beam is illuminated on the holographic recording medium, and the recording shot is = aspect 'About the light receiver will be reference beam The reproduced beam obtained by the photo-ray is converted into a re-alignment by photoelectric conversion, and the decoded decoder will decode the reproduced block code of the i-block code according to the bit code of the reproduced signal' according to the reproduced block check code. Reproduced low-density parity-matched code individual bits of the parity check code:: = density odd code = ΐ density parity check decoder, decoded according to the estimated data to decode the recorded data. In addition, the present invention provides a holographic regenerative charge. The holographic image recorder records the code code crying in the hologram recording medium, the hologram recording material, including the low density parity check code, and encodes a record data with the low density parity check code. And =-record low-density parity check code; a block encoder, using ^ code, 'encoding record low-density parity check code, and generating a record ^ record two and a hologram recorder, via The target beam is illuminated at all times and the data is recorded, and the subsequent beam of the target beam is adjusted according to the recorded block code. In addition, the holographic regenerative device, the tongue-and-full image reproduction H, includes a light receiver, by 12

The I3〇16H light beam is incident on the holographic recording medium and is reproduced by the reproduced signal; a block decoder ' _ root 摅Μ ΐ ^ ΐ should be recorded in the block code of the reproduced block code, Low-density "two-code ί Γ ί 低 low-density parity check code re-reproduction low-density parity check ^ leaf different estimate of the low-density odd-element value based on the level of the reproduced signal; and - even parity According to the estimated data, the decoding data is decoded according to the estimated data, and the data reproduction operation is performed by means of light receiving the crying electricity and generating the signal. The other party = the = The block decoder will regenerate the low density parity check code according to the reproduced block code of the regenerative buffer block code according to the reproduction block:, =: == parity code: and two; Estimating the regenerative low-density parity check code individual bits ί 奇 二 中 'reproduced low-density parity check code is decoded by the low jy even technique to decode 'according to the estimated data, to decode and record in the holographic recording and reproducing device and In the holographic reproduction device, the individual pixels of the optical receiver are obtained. The ratio of f in the reproduced signal level, and the polarity of the estimated data (four) is the polarity of each bit in the reproduced low density parity check code. According to the above embodiment of the present invention, because of the low density parity The absolute value of the poor material is the regenerative signal obtained from the individual pixels of the photoreceiver 13 I3〇l «4, d〇c,, (8) force, which reduces the bit error rate of the regenerated Reed Solomon code. In the hologram recording and reproducing apparatus and the hologram reproducing apparatus, the block code 2 generates a recording block code so that _ image gamma (10) pixels are marked "1" in the space adjuster, and 11 pixels are Other (difficult): like. Mark, 〇,, (where Ν and Μ are natural numbers, and Ν&gt;Μ). The block code is selected in the order of increasing the level of the reproduced signal, selecting one pixel of the pixel device in the light receiver, and by setting the selected (four) images to Τ, and (Ν·Μ) pixels Set to ,, 〇,,, and decode the regenerated block code. The block decoding H can add the level of the reproduced signal of the pixel of the slave, 丨, ,, and the level of the reproduced signal of the pixel set to "〇", and calculate. Estimated data for the sum of the additions and subtraction levels. According to the above embodiment of the present invention, since the present invention performs the high-performance signal processing with the low-density parity check code using the estimated data calculated from the difference in the reproduced signal level, it is relatively simple to consider the reproduced signal. The bit transfer rate of the reproduced Reed Solomon code in the present invention can be greatly reduced in terms of the size and the data. In the hologram recording and reproducing apparatus and the hologram reproducing apparatus, when there is no reproduced block code in a code word of the block code, the reproduced low density parity is decoded according to the reproduced block code. The estimated data of the individual bits of the verification code can be set to 〇. According to the above embodiment of the present invention, when the reproduced block code does not correspond to the code word of the low-cost parity code, the estimation of the reproduced block code is not used to encode the low parity code. This can avoid the degradation of decoding performance caused by incorrect estimation of 1301613⁄4 f.doc data. Other features and/or advantages of the present invention will be fully appreciated and appreciated by the <RTIgt; The above and other objects, features and advantages of the present invention will become more <RTIgt; [Embodiment] Please refer to the content of the embodiments of the present invention, and examples thereof are illustrated in the corresponding drawings, wherein the same reference numerals represent the same components. DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the preferred embodiments thereof. &lt;First Embodiment&gt; Referring to FIG. 7, a signal processor system in the hologram recording and reproducing apparatus 100 and the hologram reproducing apparatus 10a according to the first embodiment of the present invention includes: a Reed Solomon encoder 1, a low density parity check (hereinafter referred to as LDPC) encoder 10, a block encoder 2, a space adjuster 3, an optical receiver 5, a block decoder 6, a low density | A parity (LDPC) decoder 20, and a Reed Solomon decoder 7. Reed Solomon Encoder 1 encodes the recorded data with a Reed Solomon code and produces a record of Reed Solomon Code b. The LDPC encoder 10 encodes the Reed Solomon code b using an LDPC code, and generates an I I LDPC stone c. The block coding is to record the LDPC code c ' with the block code encoding and generate a recording block code d. The spatial adjuster 3 transmits or intercepts the target beam of the individual pixels, and produces a checkerboard having a code corresponding to the recorded block code d. I301^i4ifdoc product-=two! The recorded medium 4 is formed by (iv). When the refractive index of the photosensitive material is changed, the interference corresponding to the data of the recorded page is formed. The image is recorded on the hologram recording medium 4. The reproduced page material having the checkerboard pattern of the tribute to the 釺i 可i can be obtained by recording the sputum &amp; Ten [to. Have recorded the page crying 5, you can have the light receiving like a sensor or CCD image sensor ί code crying β 6 system rape page information 'to do photoelectric conversion into a regenerative signal P. The block city verifies, decodes the reproduced block code of the recording block code d, decodes the opposite bank ==X=tLDPC code according to the reproduced block code, and calculates the estimated data q according to ===; The accurate LDPC decoding of $20 for the LDPC_Difficult element of the standard syllabus will be based on the estimated data q, decoding LDp, using the Reed Solomon code &quot;. The Reed Solomon decoder 7 will decode the Reed Solomon code r, and generate the LDPC encoder 1 〇 4 Congde decoding state 20 shown in FIG. 7 and the block decoder. 2〇 operation details. The LDPC code n 1G generates an LDpc code by multiplying the input data by generating a moment = rix) G. Among them, the LDpc code is completely stupid by the parity check matrix H. The following description of the parity check matrix is derived from the example of Equation 6. The raw matrix G is derived from Equation 7. Therefore, when recording the Reed (4) code system 16 13 Ο 1 each pifdoc is obtained from the formula 8 'recording LDPC code e is used by the formula 9 - differential code one field type 1 piece. The recording block code of the precision is obtained from the formula 3, and the page data can be recorded in Fig. 3. Η

10 10 0' 1 1 ο 1 〇 〇 1 0 0 1

(6)

(7) (8) c = bG = [〇 1 1 0 0 1 0 Γ 0 10 110 0 0 10 11

17 1 , the LDPC decoder 20 decodes the LDPC code using a sum-product decoding method which will be described later. It is assumed here that the number of rows in the parity check matrix 为 is M, and the number of rows (c〇lumn) is N, then M=3 and N=6 can be obtained from Equation 6. [Operation 1 ··Initialization] First, let the elements (m, n) of the parity check matrix of all (m, η) pairs be 1 'replace L', let Hmn = l, and let the logarithm pre-value ratio (logarithmic pre -value ratio)pmn=0 〇[Operation 2: Column processing] Next, let all (m, n) pairs of m=l, 2, ···, Μ corresponding columns of I301645pifd〇c

Hmn=l, and the 外garithmic exterior-value ratio amn is calculated from the formula 10. In Equation 10, the 'sign function' represents the polarity defined by Equation 11. Nsign(qn.+Pmn〇 ξ A(m)\n 〆 Σ%η· 十β”)

VeA(m)\n (10)

Sign(x)= 1,x&gt;0 a 1, x&lt;0 (11) where 'f(x) is a Gallager function defined by Equation 12. The estimated data is obtained from Equation 13 and is obtained from the logarithmic ratio of the conditional probability of the regenerative signal level to p when the η row element Cn of the ldpc code c is 0 or 1. (l〇garithniic

Ratio). Equation 14 included in Equation 10 represents the multiplication or summation of the mth column element of the other rows used to calculate all non-dimension η row elements Cn. f(8)= exp(x) -1 (12) qn = In P(p|cn=〇) P(p|cn =1) (13) (Η) n'e A(m)\n [Operation 3: OK Processing] Ι3016ιΐ5§ρι pif.doc Let all (m, η) pairs η = 1, 2, ..., H correspond to the line Hmn = l, and let the logarithm pre-value than pmn = 〇. Equation 16 included in Equation 15 adds all the nth row elements of the other columns other than the mth column using a variable m representing the position of the row. Here, after repeating the operation 2 and the operation for a predetermined number of times, the operation 4 is executed next. Βιηη = Σ%. e B(n)\m :Β(η)\ι (15)

[Operation 4: Decoded Codeword] (16) In this calculation, the reproduction code ^1 rn (where n = 1, 2, &quot;., N) is recorded using Equation 17. Next, declare this two 7L bundle. Equation 18, which is included in Equation 17, adds all the nth row elements using a variable m of the method junction. Table row &gt; rn

〇, ifsignqj [am.n V m'eB(n) 1, ifsigniqn+ Jam, n V mr€B(n) :B(n) :-1 (17) The following shows when the parity check matrix H is derived from the formula 6 (18) - An example of the product decoding method. Among them, the operation 2 is combined with the expected one and the operation 4 is executed. Stomach and then (19) 130164^^d〇c (19) ] lx count f&amp;c [^1 β14β25β36 II = one | 1252333 β β β II II = 112231 β β β [Operation 2 (first time)] α,! = (sign(q2) -sign(q4))f (f (jq2|)-ff (|q4|)) a12 = (sign(q))· sign(q4 ))f (f (jq) |)+ f (jq41) aI4 =(sign(q〇.sign(q2))f(f(jq1|)+f(]q2|)) °^36 = (sign(q))· sign(q3 ) )f (f (jq, |)+ f (]q31)) (20) [Operation 3] β丨1 = a31 β31 ~ all β]2 - a22 [Operation 2 (second time)] , a&quot; :( Sign(q2 +P12)-sign(q4 +β14)Χ(ίψι2 +β12|)+φ4 +β14|)) a12 = (signh + β!]).sign(q4 +β14 ))f (f know + Pi ! |)+ f (|q4 + β141)) a14 = (sign(q, + β!,) · sign(q2 + β12 ))f (fl + β! 11)+ f (|q2 + β121)) a36 =(sign(q1 +P3i)*sign(q3 +p33))f(f(|q1 +P3i|)+f(|q3 +β33|)) (22) 20 , Ι3〇1615_. . [Operation 4] ίο, if sig^qj -f απ +α31)=1 \h if sign(qi +au +α31) = -1 r2 =

If sign(q3+a23+cx33)=l if sign(q3 + a23 + a33) = a 1 0, if sign(q2+a12+a22)=l 1,if sign(q2+a12+a 22) = ^ 1

If sign(q6+a36)=l if sign(q6+a36) = -l 0, ifsign(q1+a,1+a31)=l 1, ifsign(q1+a1I+a31)^| % ifsign(q2+ A12+a22)=l ), ifsign(q2+a12+a22): -l 0, ifsign(q3+a23+a33)=l 1, ifsign(q3+a23+a33)=-1

0, (4), 1, ifsig4 + %) = -1 (23) Figure 8 is a circuit diagram showing an ldpC decoder 20 according to an embodiment of the present invention. This circuit has a pipeline structure in which data flows from top to bottom, and continuous signals are input thereto. However, this 21 130161⁄2 if.doc structure: medium ~ it can also be - ring (--) straight φ, ^ n Dan mouth feeds to update the memory content. i can calculate the absolute U number T can be included in the - lookup table (i ° ° k_up tabie). Set to Ιί. The highest bit of the ^^ letter is m°stsignifieantbit), and the highest bit of the code can be retrieved, and the function symbol is easily categorized by the mutually exclusive logic and (4) the heart and the ring. = FIG. 7 and FIG. 8 do not employ the LDPC decoder 20 to receive the estimated data and the line-product decoding method, and output the reproduced Reed Solomon code r. Therefore, according to the block decoder 6 of the real__, the level difference Δ' between the regenerative p-levels is calculated to obtain the estimated data q, and the estimated data q is input to the LDPC decoder 20. Do it again. The probability distribution of the regenerated number p corresponds to a Gaussian distribution with an average of m and a variance of σ2, and the regeneration sfl number can be calculated by the formula 24 The probability density function of ρ. When the differential code is used as the block code, the estimated data q in Equation 13 can be calculated by Equation 25. (24) 22 13 016 green f.doc q = ln P(p[c = 〇) P(p|c = l) V^Tto&quot; ν2πσ^ 2(P2—P!) -exp- .(p2zpm£_ ] ___ 2σ2_I L(P2zPl±1)!]

In other words, it is assumed that the regenerative signal level of the adjacent upper and lower pixels of the optical receiver 5 is Pl &amp; P2 'the difference Δ is calculated by the public Α 26, and multiplied by a proportional constant (constant 〇f pr If the teacher i〇naHty), the estimated data q can be calculated by Equation 27. The variation number (σ2) can be actually measured from the reproduced signal ρ by a calculation circuit, or can be stored in a predetermined value in the memory. △ = P2—Pl

As described above, in the present embodiment, the same reproduction data as the recorded material can be reproduced by combining the block code and the ldpc code' in a five-reliability manner. In the reproduced page data reproduced from the hologram 5 recorded media, the bone level of the individual pixels is changed by various disturbances, and thus there are multiple numerical gray levels. However, in the present embodiment, since the estimated data of the LDPC code is effectively calculated by using the level data of the reproduced signal having multiple values = quasi, the error correction capability of the LDPC code can be improved, and the regenerative reed can be reduced. The bit error rate of the Solomon code. &lt;Second Embodiment&gt; 23 1301615§pifd〇c, ...,: In the first embodiment, the differential code is used as the block code, but the 2:4 code can also be used. The coding rules for the 2··4 code are as shown in Fig. 9, and an example of the recorded page data is shown in Fig. 10. In this example, the block decoder 6 compares the luminance levels of the code numbers constituting the 2·· 4 code, and sets the images and the alignments to Pi, P2, and P3, respectively, in the order of increasing brightness. And P4, wherein the level difference ^ can be calculated by Equation 28, Equation 29, or Equation 30. Δ==Ρι-(ρ2 + ρ3+ρ4)

(28) Δ = ρ1^·Ρι+Ρ2+^3+Ρ4 Please refer to Figure 9. When the brightness level of the pixel in the upper right corner is the highest, the reconstructed block code is the estimated value of the block code d. 3, can be: f two counts J and then as the estimated value of the recorded LDPC code c: LDPC code c, can be calculated by the formula 32.

(U 〇Γ 〇 0 (31) [0 1] Since the estimated regenerated LDPC code system is proportional to the level difference Δ, the estimated value of the first line of the estimated regenerated LDPC code is compared with the second line. The estimated data q2 ' can be calculated by Equation 33. When the recorded LDPC code Cn = 0 is greater than the value of Equation 13, "is positive, and 24 I if.doc is greater than the probability of cn = l is greater than In Equation 13, qi is positive for u in the formula and 贞. Therefore 2 Δ 2 Δ is generated, decoding is reproduced =; plus 'and the brightness level of the pixel set to , °° is 3: code H is proportional, and The polarity corresponds to the reproduction 1^: &lt;Third embodiment&gt; · The prime is (4) "1" 'The other seven like nine ΐΐ == ΓΓ 5 will select the level of the 5:9 code code word as M p The p6, P7, ρ8, ί pixels of the selected two pixels are respectively PH, and the power of 2 represents HS as 8 and 23 means 'Also can be set, which is convenient for performing division in digital circuits. See, 25 (34) (35)

In 〇 0 〇 〇] 130161⁄2^, 8 can be used as the denominator of the second term on the right side of Equation 35 and Equation 36. When the §fl number P passes through the high-pass fiiter, the value of the second term on the right side of the formula 36 is almost 〇 and can be removed, so the level difference a can be obtained by the formula 37. Δ==(Ρι +Ρ2)-(ρ3 +ρ4 +Ρ5 +Ρ6 +Ρ7 +Ρ8 +Ρ9) △ = Ρ3+Ρ4+Ρ5+Ρ6+Ρ7+Ρ8+Ρ9 2 ^ 8 ~~ Δ = Pi±£i_ Ρι +Ρ2 +Ρ3 +Ρ4 +Ρ5 +Ρ6 +Ρ7 +Ρ« +D. 2 8 ' *~~~ (36) A^h±P2 2 (37) In the example of Hummer, the history is determined as τ The number of pixel groups is such that the number of pixel groups used as block codewords is 25=32. Figure 12 has 36·22 = 4 pixel groups and is not in the codeword. For example, a 4-pixel group such as a hall may not be used in a ^5 horse character.

The composition t ’ is selected by allowing the block decoder 6 to select two of the nine pixels of the horse code of Fig. 6 in the order of increasing brightness, so that there is a data set and a prime group exists. In this example, a reliable estimate cannot be obtained. In the 5:9 area, the decoder 6 sets the cr〇 to the LDPC decoder 20. In the example of the $ π code of the eagle, since the nine-pixel system corresponds to the regenerated LDPC, Equation 38 can be obtained. This (four) sub-estimation data performs an LDPC decoding operation. Hi - (38) 26 130161⁄2 pif.doc 130161⁄2 pif.doc

For the sake of simplification of the description, although in the above embodiment, the example in which the degree N is 6 ' and the parity code is obtained from the formula 6 has been described. However, the code length N of the LDPC code may be tens or hundreds of bits. In addition

In the hologram recording and reproducing apparatus, the positional deviation between the space adjuster and the light receiving unit may be caused by the mechanical position deviation of the optical system or the contraction of the hologram recording medium. To avoid performance degradation due to location errors, a technique called ^ver sampling may be used. In this oversampling technique, spatially adjusted pixels and optically connected m pixels are not in a ratio of 丨:丨, but correspond to a ratio relationship of, for example, 1:4. Referring to FIG. 13, the recording system maps the reproduction f f twice, and the four pixels of the decoder 6 indicate the 1-bit of the recording block code d. The block decoding 6 can obtain the reproduced signal of one pixel by adding the value of the level of the reproduced signal of four pixels. , the description of the domain, the axis has been before the operation 2 will be observed to perform two - people. However, the sum-product decoding method can be repeatedly performed four to several times, and the present invention can be applied to this example in a manner similar to the above-described examples. Although the above-described embodiments use a differential code, a 2:4 code, and a 5:9 code as the block code ❹', the present invention is limited to the above embodiment. Although I have explained that the estimated data is proportional to the level difference Δ, the eight-difference iq can also be any function of the level difference Δ, and the function is based on the recording of each needle of the re-arranged towel. The probability of distribution depends. Error two. ^Asian (four) can only use Reed Siro mi, can also use other field LDPC code correction ability is high enough, that is, do not need to use Reed Solo 27 13 Ο 1 6i &lt; ^) ifdoc door code and other errors Correction code. Since both the hologram recording and reproducing apparatus and the holographic re-arrangement according to the present invention combine the block code with the LDPC code, the same reproduced material as the g recorded material can be reproduced in a high degree of sin. In the conventional hologram recording and reproducing apparatus and the conventional hologram reproducing apparatus, the signal noise ratio of the reproduced nickname is usually deteriorated by various disturbances. However, according to the holographic recording and reproducing apparatus of the present invention and the LDPC code which is capable of correcting the error of the appliance, the bit error rate of the "Sene" code can be lowered. In addition, in the reproduction page data to be reproduced from the hologram recorder, the brightness level of the pixel changes due to various disturbances, and the brightness. In the regenerative device and the holographic re-wire according to the present invention, the error is obtained by effectively calculating the level data of the scoop regenerative heart in the two consecutive examples. An ability 'and ability to reduce the regeneration of Reed's _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ The latter 3 The protection of the present invention [Simple description of the drawing] For the processing of the (4) (4) holographic recording and reproducing device, the signal 28 f.doc I301615pi is intended to be a schematic diagram of the sample of the _ _ _ _ physical degree example . Intention. The purpose of the record page data level example of the target page 7 is a schematic diagram showing an example of the reproduction page data. . Fig. 7 is a diagram showing the reproduction page data level example shown in Fig. 5. Fig. 7 is a diagram showing the +u and the reproduction device; and the hologram recording of the embodiment is shown in Fig. 8. Fig. 8 is a block diagram of the device. The power of the even parity decoder: according to an embodiment of the present invention, a low-density singularity diagram 9-standard luminance level::: The individual image generated by the present invention-embodiment is shown in Figure 1. The data sheet according to the present invention-embodiment is described in accordance with the recording record of the embodiment, and the r, ^^ raw babe according to another embodiment of the present invention is illustrated. Schematic diagram of the relationship between 枓. Main component symbol description] 1 · Reed Solomon encoder 29 I3016i &lt; S) ifdoc 2 : Block encoder 3 : Space adjuster 4 : All-image recording medium 5 : Optical receiver 6 : Block decoder 7 : De Solomon decoder 100: hologram recording and reproducing device 100a: holographic reproducing device

Claims (1)

X. Patent application scope: 1. A holographic recording and reproducing device, comprising: a low density parity check (LDPq encoder; code-record data, and generate-record LDK; code; coder's system-area Block code, encoding the record LDPC sub-and generating a recorded block code; recording medium: illuminating the hologram by a target beam ΐ敫 - confusing, and the brightness of the target beam is adjusted from a space to the recording block code; - a holographic regenerator, which includes a light receiver, via a reference, beam illumination To the holographic recording ship (4) - the reproducing beam is photoelectrically converted into a regenerative signal to regenerate the data; The code-block decoder decodes the -reproduced block code corresponding to the recorded block code according to the one bit of the reproduced signal, and decodes a regenerated LDPC corresponding to the recorded LDPC code according to the reproduced block code Code, and calculating an estimated data, by which a majority of a plurality of individual bits of the reproduced LDPC code are estimated according to the level of the reproduced signal; and an LDPC decoder for decoding the LDpc code according to the estimated data To decode the recorded data. 2. The holographic recording and reproducing apparatus according to claim 1, wherein an absolute value of the estimated data is the same as the reproduced signal obtained from the corresponding pixels of the optical receiver. A difference between the levels is proportional. 3. For example, the holographic recording and regenerative equipment described in item 2 of the Shenqing patent scope 31 • 13 Ο 1 61I5 each pif.doc, the polarity of the “Hao estimated 50 lbs.” corresponds to the mother of the regenerative (3) PC code. The polarity of these bits. The holographic recording and reproducing device and the middle block encoder described in item 1 of the patent application form of the first application of the present invention can generate the recording block code so that the μ of the N pixels in the adjustment 11 are The pixels will be labeled as, Γ, and (β_Μ) pixels of the two pixels will be labeled as, 〇,, (ν and Μ are natural numbers, and. 5. The holographic recording/reproducing device according to claim 4, wherein the ship riding is in an order of increasing the number of __ positions: selecting the (four) pixels of the light receiving H. The pixels are decoded and the reproduced block code is decoded by setting the selected pixels to "1," and setting the (Ν-Μ) pixels to "〇". 6. The holographic recording and reproducing apparatus as described in claim 5, wherein the block decoder adds the levels of the reproduced signals of the pixels set to "丨", Set to "Q," the levels of the reproduction of the pixels are subtracted, and the estimated data is calculated from the ratio of the added and subtracted levels. 7. The holographic recording and reproducing apparatus according to claim 1, wherein when the reproduced block code is not in a codeword of a block code, the reproduced LDpc is decoded according to the reproduced block code. The estimated data of the corresponding bits of the code will be set to zero. "8"-type holographic reproducing device for reproducing data recorded in a hologram recording medium by a hologram recorder, and the hologram recorder includes a low-temporal parity check (LDPC) encoder. It uses an LDPC code, coded two 32 13 Ο 1 0lh ^ pif doc - record Cong code; a block code used in the ghost code, encode the record LDJPC code, and produce peak ', ', on the recording medium The second target beam is irradiated in the holographic space adjustment tit 1, and the brightness of the target beam is adjusted by a method including: _ recording block code 'and the holographic reproducing device is also * anti-king image re-ecology, the system includes An optical receiver reproduces the data by retrieving and reproducing 5 tigers by reusing a light beam obtained from a watch; and correcting the 'according to the one of the reproduced signal' to decode the corresponding two-two-degree ghost a regenerated block code, according to the regenerated block code, the solution ============================================================================================ - an LDPC decoder that decodes the LDpc code based on the estimated data, To decode the recorded data. ▲ 9. The holographic reproducing apparatus according to claim 8, wherein an absolute value of the data is associated with the corresponding signal obtained from the corresponding pixels of the optical receiver. The omni-directional reproduction device of claim 9, wherein the polarity of the estimated data corresponds to each of the regenerated LDPC codes. The omni-directional reproduction device of claim 8, wherein the block encoder generates the recorded block code such that 33 13 Ο 1 6 is adjusted in the space. ^5 Each of the N pixels in each pif.doc will be labeled as, ", and the (Ν_Μ) pixels of the U &lt; solid pixels will be labeled as, 〇" (Ν and Μ For (four) numbers, and Ν&gt;Μ). 12. If the holographic reproducing device described in the U (IV) U item is applied, the block decoder in the bean selects the N pixels of the optical receiver in an order in which the level of the reproduced signal is increased. M pixels, and the hunting is to decode the reproduced block code by setting the selected pixels to "1", and by arbitrarily, (G,). 13. If you apply to turn the holographic regenerative device described in item 12, and the ==! device will set the regenerative signal =::fr for those pixels set to , , ], , to be set to , 0,, The re-domain of the pixels: and the calculation and the addition and subtraction of the level of the formation of the mountain 14 as claimed in claim 8 of the holographic reproduction device, the bean = the regeneration block When the code is not in the codeword of the block code, the data of the corresponding bits of the reproduced LDpc^ decoded according to the code is set to 〇. ··-type holographic recording and reproducing apparatus, including · code "manual parity check (LDPC) code H, which uses - parity check a record data, and generates a record LDpc code; code one block The encoder's system-region handle encodes the record LDpc and generates a record block code; the recorded media r=f:r__beam' is illuminated in a hologram 34 if.doc 13 016 secret space adjuster, according to Recording a block code to adjust the brightness of the target beam; a holographic regenerator regenerating the data by photoelectrically converting a regenerated beam by irradiating a reference beam onto the holographic recording medium; The block decoder decodes a regenerated block code corresponding to the recorded block code according to a bit of the reproduced signal, and decodes a regenerated LDPC code corresponding to the recorded LDPC code according to the reproduced block code, and Calculating an estimated data to estimate a majority of a plurality of individual bits of the LDPC code according to the bit differences of the reproduced signal; and, an LDPC decoder, decoding the LDp according to the estimated data, Take Decommission the record data.,,, 16. For example, please refer to the holographic recording and reproducing device described in item 15 of the special plane (4), wherein the holographic regenerator includes an optical receiver. The holographic recording and regenerative image == adjust the pixels of the adjuster and the optical receiver's technology to increase its reproduction accuracy. Bei set, L8t application specific f range 帛 15 items The holographic record and the regenerative load number can be used as the arbitrary distribution of the position difference of the reproduced data, which is determined by the probability of each pinch of the Wei towel, ^:=: the holographic record With the butterfly 35 13 Ο 1 6l! 5 preparation pif.doc 詈 special · (d) 15 rhyme description of the holographic recording and reproduction device, where the block code includes a 2: 4 code 7 ^ Dan Shengzhan as the 2: 4 code majority Codewords::Products] Benefits will increase the brightness of the increase: Cai, will (10) give priority and use f m4 to supplement (4) 15 items of the holographic recording and reproduction wear a 5:9 code, and the block decoder will : In the holographic recording and reproducing device described in Item No. 2, the absolute value of the 5 hai estimates - the material of the bedding, :: "the pixel obtained by the pixel of the level of the re-processing of the mr complement 1_22 rhyme full The polarity of each of the two recording and reproducing devices corresponds to the reproduced LDpc code. 24. The holographic recording and re-setting as described in claim 16 wherein the block encoder generates the recording block code such that M pixels of the N pixels in the space adjustment are marked For the holographic recording and reproduction as described in claim 24, wherein the block decoder will increase the order of the reproduced signal _ level: select the county receiver (four) pixels of which Μ a pixel, and by setting the selected pixels to "丨,,, and setting the 36 I3〇16i^3ifd()c (NM) pixels to ,,〇,,, And the reproduced block code is decoded. 26. The holographic recording and reproducing apparatus of claim 25, wherein the block decoder adds the levels of the re-signals of the pixels set to "丨," The levels of the reproduced signals of the pixels set to , , 〇, , are subtracted, and the estimated data is calculated in proportion to the added and subtracted levels. The omni-directional recording and reproducing apparatus described in claim 15 (4), wherein when the reproduced block code is not in a codeword of a block code, the reproduced LDpc code decoded according to the reproduced block code Corresponding to: The estimated data of one is set to 〇. A 70 28. The holographic recording and reproducing apparatus of claim 15 wherein the block decoder calculates the bits of the reproduced signal The reference information is obtained by the bit difference. 曰29. The holographic recording and reproduction apparatus according to claim 15 of the patent scope, wherein the LDPC encoder calls the record by a matrix LDPC: code. I produce 30. If you want to towel, please _ 15 items Recording and re-== The LDPC decoder uses a complement and complement method to decode the jl. The conditioned condition of the holographic recording disk regeneration as described in the Scope of the Patent Application 帛3〇 The second party must first receive the estimated data. H must 32. The full image set as described in item 15 of the scope of claim, wherein the LDPC decoding is crying, the rainbow is a gentleman, and the Dansheng is included in the package. Data input 37 130161⁄2 if.doc A circuit structure into one of the pipelines. tSolution ^^=The holographic recording and reproducing device/circle-circle-loop circuit structure described in Item 15 Most of the continuous signals are input to H and most of the calculation results can be further (10) to, in order to better remember the tragic content. , ', 34 · - a full image data processing and regeneration method, including · encoding a recorded data, and Generating a recorded Reed Solomon code; encoding the 5 recorded Reed Solomon code, and generating a Recording Low Density Parity Check (LDPC) code; lying in the mountains without encoding the recorded LDPC code, and generating a recorded block code ; a plurality of target beams of a plurality of corresponding pixels Transmitting to a full recording medium 'and/or the holographic recording system, _ the _ the target beams' and generating a recorded page material having a checkerboard pattern corresponding to the recorded block code; Converting into a regenerative signal; according to the levels of the reproduced signal, the decoding corresponds to the recording block H_τίίΪ block code 'decoding the regenerated LDpc code corresponding to the recorded LDPC code according to the regenerated block code', And calculating-estimating data to indicate the accuracy of the individual bits of the regenerated coffee according to the regenerative devices; and decoding the LDPC code according to the estimated data, and generating a Reed Solomon code; and decoding the Dansheng decoding This regenerates the Reed Solomon code and produces a recycled material. Recognizing the full image data processing and 38 I3〇lmrdoc as described in item 34 of the patent application scope, the method of 't encoding the record' includes the use of the Reed I' code to record the Reed Solomon code including the use of -LDPC Code, edit: =b:c code includes the use of a block code, and: Solomon code includes the use of a Reed Solomon code. In the "36. - encoding and decoding device, which comprises - generating a regenerative signal, the encoding and decoding device comprises: a U-degree parity check (LDPC) encoder, #, and generates a record code ; 娜'. has recorded a block and a block encoder, using a 诒 诒 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Recording a "reproduction block code" of the block code, transcoding, decoding a block corresponding to the record code, to estimate a majority of the number of positions based on the position difference of the reproduced signal a value of ^ and a multi-LDPC decoder for estimating the reproduced code, according to the time and decoding the recorded data. The second code of the record code, 39