TW200534265A - Hologram recording and reproducing apparatus and hologram reproducing apparatus - Google Patents

Abstract

A hologram recording and reproducing apparatus having a reduced encoding error and high reliability even when a signal-to-noise (S/N) ratio of reproducing signals is deteriorated due to various disturbances. The hologram recording and reproducing apparatus includes: a unit generating a recording low-density parity check code from recording data; a unit generating a recording block code from the recording low-density parity check code; a unit recording data by emitting an object beam onto a hologram recording medium; a unit reproducing data by emitting a reference beam onto the hologram recording medium; a unit decoding a reproducing block code corresponding to the recording block code based on the levels of a reproducing signal, decoding a reproducing low-density parity check code corresponding to the recording low-density parity check code based on the reproducing block code, and calculating estimation data estimating values of respective bits of the reproducing low-density parity check code based on the level of the level of the reproducing signals; and a unit decoding the low-density parity check code based on the estimation data and decoding the recording data.

Description

200534% 50 cp λ IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a holographic recording and reproduction device and a holographic reproduction device for recording data on a holographic medium, or Reproducing materials from holographic media. More specifically, there is a holographic recording and reproduction device and a holographic reproduction device that can reduce decoding errors even when the signal-to-noise ratio of the reproduced signal deteriorates due to interference. [Previous Technology] ® In recent years, rewritable optical disks such as phase-change optical disks and magneto-optical disks have been widely used. To increase the recording density of such discs, a technique that reduces the diameter of the beam spot 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 optical discs is continuously increasing year after year. However, the data recording density in this disc plane is limited by the diffraction limit of light (diffractive limit). Therefore, it is necessary to use a three-dimensional multiple recording technology that utilizes the depth of the disc to increase its recording capacity. Hologram memory has a three-dimensional recording area to provide a larger capacity, and it uses the currently developing two-dimensional batch recording and reproduction method to provide better access speed. Therefore, holographic memory can be used as the next-generation computer memory. In holographic memory, the object beam and the reference beam of 6 20053 recorded i corresponding to the recorded material will be incident on the recording medium, and two ^ on the recording medium Between glass plates, a reC〇r (Jing layer) made of a material such as a photopolymer (phOtopol) is inserted. Next, a beam The refractive index (refractjvein (Jex)) of the S-recorded material is changed, and an interference pattern is generated to record the data. In addition, during the data reproduction operation, only the reference beam is irradiated on the recording material, and the interference can be reproduced by Pattern, and capture the optical data corresponding to the recorded data. Figure 1 shows a signal processor of a conventional holographic recording and reproduction device. Please refer to Figure 1 for the Reed Solomon encoder (Reed -Solomon encod) 1, which uses a Reed-Solomon code (Reed-Solomon code) to encode the recorded data, and generates a recording Reed-Solomon code (b). Block encoding is (block encoder) 2 A block code (biock code) is used to encode the record Reed Solomon code b, and a record block code (recolding blocCkde) is generated. For example, please refer to FIG. 2 It is shown that if b = 0, then it can be paid to d by the following formula 1. On the contrary, if b = 1, you can perform a coding process using a differential code ((jifferentiai cocje) of d given by the following formula 2. ⑴ 7 0 2005343 ^ 5) 0 d =. (2) Please refer to FIG. 1, and transmit the target beam of pixels corresponding to “1” in the recording block code d, and intercept the corresponding ,, The target beam of the pixel, Space modulator 3 will generate recording-page data to mark a checkered pattern corresponding to the recording block code d. For example When d is obtained from the following formula 3, the record page data shown in FIG. 3 will be generated. In another method, one of the four pixels is used, and Γ, and the other three pixels are “0”. Is a special code, and this code will be referred to as 2 · 4 code in the following (please refer to Japanese Patent Issue No. 9-197947). Figure 3 The brightness level of the first row of pixels of the recorded page data), as shown in Figure 4. Each pixel of the recorded page data is either black or ⑩ from '㈣each-correspondence The pixels represent another two-bit level) 0 Please take a second look at the 'holographic recording medium 4 shown in Figure 1 by depositing a photosensitive material on the disc substrate (SUbStrate) ), And the recording page data is recorded on the reference material and the target beam when the interference pattern of the photosensitive material changes the refractive index of the photosensitive material. By irradiating a reference beam on the hologram recording medium 4 ', a reproduction page material (repr0dudng review 8 mm 2005342 ^ 500 data) corresponding to a checkerboard pattern of the recorded page data is available. FIG. 5 shows a process of reproducing the reproduced page data obtained by recording the recorded page data shown in FIG. 3 on the hologram recorder 4 and reproducing the reproduced page data from the hologram recording medium 4. The brightness levels of the pixels represented by the first column of the reproduced page data shown in FIG. 5 are shown in FIG. 6. '. The individual level of each pixel in the reproduced page data obtained in this way is between black and the gray zone, and the brightness level of the side pixels will have a continuous multi-valued levd. This is because of various interferences in holographic recording and reproduction devices, such as media noise, mutual interference between system codes, crosstalk, pixel position deviation, and so on. Caused by a change in the regeneration signal level. The light receiver (1_ · ίνεΓ) 5, which has a CMOS image sensor or a CCD image sensor, will perform photoelectric conversion of the reproduced page data to generate a reproduced signal (re—— sigi ^ al) p regeneration flood number has a continuous multilevel value similar to the brightness level shown in FIG. 6. The block decoder (blQekd⑽de.r) 6 decodes the block code according to the level of the reproduction signal P and generates a re-Solomon code r. In other words, assuming that the values of the reproduced signals reproduced from the up and down pixels of the optical receiver 5 are pi and P2, if 卩 丨 < p2 'then ^ block decoding H 6 will determine the recording block The estimated value of code d is given by Equation 4, and a regenerated Reed-Solomon code is generated. On the other hand > ' If Pl > P2, the block decoder 决定 will determine that the estimated value of the recording block code d is obtained from Equation 5, and generates a μ-regenerated Reed Solomon code. Reed-Solomon decoder 7 uses Reed-Solomon codes to solve 9 2005342 & &. Code to reproduce the Reed Solomon code r and generate reproducing data s ο d (4) (5) In the conventional holographic recording and reproduction device, before Reed Solomon executes the decoding process, The reproduced data S must be equal to the recorded data a having a relatively high reliability, and the bit error of the Reed Solomon code r is reproduced. The bit error rate must be reduced to less than about ιχι〇_4, for example. However, in an actual holographic recording and reproduction device, the signal-to-noise ratio of the reproduction signal (^ gnai_t0_noise, S / N) is very susceptible to media noise, system noise, mutual interference between codes, The effects of crosstalk, pixel position deviation, etc. are worsened. Therefore, there are often errors in the reproduction of the Reed Solomon code r, and the bit error rate will deteriorate to about, for example, as described in Lei 2. The individual level of each pixel in the reproduced page data is mediated by the brightness of the prime. Reciprocal position of the level and re-leveling of the regenerative signal == 2: 2: The regenerative signal caused by the quasi-interference, the big change, 2005345 ^^ 5) 0 [Summary of the invention] The present invention provides-a kind of holographic recording and reproduction Device, and a full-image reproduction device. It can provide a lower decoding error rate and higher reliability when the low-density parity check (LDPC) code is used to perform a high-performance decoding process, and the signal-to-noise ratio of the reproduced signal is deteriorated due to various interferences. degree. According to the present invention-viewpoint, the holographic recording disc reproduction device provided by the present invention includes: a low density parity check encoder (low_density parity • check encoding unit), which encodes a record with a low density parity check code Contribute, and generate-record low density parity check code; a block encoder 'use-block code, encode and record low density parity check code, and generate-record block code; a hologram recorder (} 1〇1〇§Deletion and stealing g =) 'By irradiating-the target beam on the holographic recording medium, and recording the tribute, and the brightness of the target beam is adjusted by the space adjuster according to the recording block code;-a Holographic regenerator _〇 Thank you ah (1 she asked, it includes a light receiver, by irradiating a reference beam to the holographic body Lu-body-the regenerated wire, photoelectric conversion into — Regenerate signals and reproduce data;-A block decoder 'decodes the reproduced block code corresponding to the recorded block code according to the level of the reproduced signal, and decodes the corresponding low-density parity check code according to the reproduced block code. Low regeneration Degree parity check code, based on the level of the reproduced signal to estimate the estimated bit data of the low density parity check code (estimati〇n data); and a low density parity check decoder, based on the estimate Data, decode the low density parity check code to decode the recorded data. 200534S ^ 50c According to the above embodiment, the recorded low density parity corresponding to the recorded data === is generated by the low density parity check encoder. Corresponds to The recording block code for recording the low-level even parity check code is produced by the block coding industry ^ and the target beam is riding on the holographic record body, and the brightness of the target beam is recorded. It is adjusted by the space-adjusted block code. On the other hand, regarding the light receiver, the reference beam H will be irradiated on the hologram recording Satoshi to reproduce the beam, and the data reproduced through the photoelectric conversion handle ^ will be used according to the block decoder. Level of the reproduced signal, decode the reproduced block code corresponding to the recorded block code, decode the reproduced low density parity board check code corresponding to the recorded low density parity check code according to the reproduced block code, and calculate the basis The level of the reproduced signal is estimated to reproduce the estimated data of the individual bit values of the low-poor parity check code. Among them, the reproduced low-parity check code is a low-density parity check decoder that decodes the recorded data according to the estimated data. According to another aspect of the present invention, the present invention provides a holographic recording device for reproducing information recorded in a holographic recording medium with a holographic recorder. The holographic recording includes:-a fitness parity check code as , Its system _ kinds of low-density parity check code encoding-record data, and j generate-record low-density parity check codes; _ block encoders, using block codes, encoding and recording low-density parity check codes, A record, a block code, and a holographic recorder are used to record the data by irradiating the target beam on the entirety, and the brightness of the target beam is adjusted by the studio adjuster according to the recording block code. In addition, the holographic reproduction device includes a holographic regenerator, which includes a light receiver, 12 20053 Article 5〇c 转; turn ίίίί the reproduction beam obtained by shooting on the holographic recording medium, After the level of the reproduced signal, the decoding pair is bank 2: the decoder, according to the low-density production odd Hr pro-low-density parity check code, and the regeneration is low ρ ΛΆ ', and calculates the estimated reproduction low according to the level of the reproduced signal. The parity check code unit = parity, the encoder, according to the parity weight check code to decode the recorded data. According to the above embodiment, the data reproduction operation is performed by irradiating the reference beam to the holographic record __, first receiving m to convert it into regenerating light, owing money r-. However, regarding the two reproduced blocks, Level, decoding corresponds to the block code, according to the reproduced block code, decodes the reproduced low-density parity check code corresponding to the ^ ^ check code, and calculates the density parity check decoder: according to the school data. Decode according to ..., Baike, to decode and record in the holographic recording and reproduction device and holographic reproduction device, estimate the reproduction signal bits obtained by individual pixels of the receiver = the ratio, and estimate the polarity of the data ( p0larity) is the polarity of each bit in the reproduced low density parity check code. According to the above embodiment of the present invention, because the absolute value of the low-density meter data and the field obtained from the individual pixels of the optical receiver = 13 20053426r5b! ^^ 1, the error of the low-density parity check code can be improved. Mind force is used to reduce the bit error rate of the reproduced Riello code. "For the image recording axis reproduction device and the hologram reproduction device, the block editor 'Ί @ generates a recording block code so that M pixels out of N pixels in the space adjuster will be marked with" 1 ", and N The other (N-M) images in each pixel will be labeled, 0 "(where N and M are natural numbers, and N > M). The blocks are decoded in the order of increasing the regeneration signal level, selecting two pixels of the two pixel pixels in the optical receiver 'and setting the selected M pixels to τ and (N_M) Pixels are set to, 〇 ”, and decoded and reproduced block codes. Block decoding ϋ can add the levels of the reproduced signals of pixels set to“ 丨, ”: set ☆ to the reproduced signals of pixels Subtract the levels of, and calculate estimates that are proportional to the addition and subtraction levels. According to the above-mentioned embodiment of the present invention, because the present invention uses the estimated 计算 calculated from the difference in the level of the reproduced signal to perform a high-performance sensation with a taste parity check code, it is more correct than Considering the example of the relative size and the mosquito data, the bit transmission rate of the gate code in the present invention can be greatly reduced. In the hologram recording and reproduction device and the hologram reproduction device, when there is no reproduction block code in the -code word of the block code, it is decoded according to the reproduction block code. The individual bit estimation data of the reproduced low-density parity check code can be set to zero. 6 According to the foregoing embodiment of the present invention, when the reproduced block code does not correspond to the codeword of the low-slack parity check code, the estimated parity of the reproduced block code is not used to encode the health parity check code. This can avoid false estimations. 14 2005342 ^ Sc The decoding enablement deterioration caused by the display is based on other features and / or advantages of the present invention. Through the implementation, you can fully understand and study the present invention. In order to make the present invention easier to understand, the following special enumerations can be more clearly described below than other objectives, features and advantages. ^ Heart example, and cooperate with the attached drawings for details = [Embodiment] Please refer to the drawings for implementing the present invention, in which the same two members are shown in the corresponding preferred embodiments, and cooperate with the table. member. In the following, < First Embodiment > As shown in FIG. 7, according to the first 3rd generation of the present invention: 100 and holographic reproduction device. The second: the image recording includes a Reed Solomon MW shout processor (hereinafter referred to as LDPC) encoder 1Q, ^ = solid low Loose parity check (with integer 3, an optical receiver 5,-: ~ coder 2, a spatial tuning parity check (LDPQ decoder π, with decoding benefit 6, a low-density Reed Solomon: code: Γ: Wide Reed Solomon _ ^^^ data, and generate a record; 2 Soloml 'encoding record data use _ code, encoding record encoder 10 records LDPC code c. M series Weimen code b, and Generates a taste of f, flat, and benefit 2 by recording the LDPC code c 'with block code encoding, and the adjuster 3 will transmit or intercept the target beam of the individual pixels, and generate a signal with a corresponding block code d. The chessboard 15 20053 looks like 64. ξ: Holographic recording medium 4 is formed by sinking, discontinuing, and discontinuing on the disc substrate. ^ By changing the refractive index of the photosensitive material, the beam and target beam are formed corresponding to the recording Page Assets_Interfering with Huishou Mu can record the poor material on the holographic recording medium 4. Via the recording medium, Obtain a reproduced page material with a checkerboard pattern corresponding to the recorded page. With CMOS image sensor or CCD image sensor

It can convert the regenerated material into photoelectric conversion into regenerated signal p. The "block stone" is a series 6 that decodes the reproduction block code corresponding to the recording block I d according to the level of the reproduction signal p, and decodes the reproduction LDPC code corresponding to the recording LDPC code e according to the reproduction block code. And calculate the estimated data ^ to mark the accuracy of the reproduced LDPM_ bit according to the level estimate of the reproduced signal P. The LDPC decoder 20 decodes the LDpc code based on the estimated data q, and generates a reed's dimension gate code r. Reed Solomon Decoder 7 will

Using the Reed Solomon code, the Reed Solomon code r is decoded and reproduced, and the raw data s is generated. Details of the operation of the LDPC encoder 10, the LDpc_encoder 20, and the block decoder 20 shown in FIG. 7 are described below. The LDPC encoder 10 generates an LDPC code by multiplying the input data by a generating matrix G. Among them, the LDPC code is completely defined by a parity check matrix H. The following illustrates the example of the parity check matrix obtained from Equation 6. The resulting matrix G is given by Equation 7. Therefore, when recording the Reed-Solomon code b is 2 0 0 5 3 is obtained by Equation 9. By using, the record page data shown in Equation 3 can be obtained. When obtained from Equation 8, the LDPC code c is recorded with a differential code to record the recording block code of the LDPC code c, and the result is shown in Figure 3, 1 0 1 Ο (Γ (6)

0 1 10 10 _1 0 1 0 0 1 1 0 0 1 0 1 G = 0 1 0 1 1 0 0 0 1 0 1 1 b = [〇1 〇] c two bG: 1 0 0 1 0 Γ] 0 1 0 1 1 0 0 0 10 11 (7) ⑻: [〇

(9)

The LDPC decoder 2G decodes the LDPC code using a -sum-product decoding method which will be explained in the article. It is assumed here that the number of columns (row) in the parity check matrix Η is M and the number of rows (c0lumn) is N, then M = 3 can be obtained from Equation 6. [Operation 1: Initialization] First, let the elements (m, n) of all (m, η) pairs of parity check matrices be 1, in other words, let Hmn = 1, and let the logarithmic pre-value be more than Q〇garithmic pre-value ratio) pmn200 [Operation 2 ·· Column Processing] Next 'Let all (m, η) pairs np31, 2, · · ·, jy [corresponding column of 17 2005342 ^

Hmn is two, and logarithmic exterior-value ratio amn 0 is calculated from Equation 10. In Equation 10, the sign function (sign functión) represents the polarity defined by Equation 11. f \ [7sign (qn, + pmn,) 1 r \ r Zf (| qn, + PiJ), n’eA (m) \ n) \ n'e A (m) \ n j (10)

sign (x) = 1, x > 0 —1, x < 0 where ′ f (x) is a Gallager function defined by Equation 12. The estimated data is obtained from Formula 13, and is obtained from the logarithmic ratio of the conditional probability of the reproduced signal level p when the LDp (: nth line element of the code c is 0 or 1). ^ ratio). Equation 14, contained in Equation 10, is used to calculate all

Multiplication or summation of elements in the m-th column of other rows other than the n-th element Cn. f (x) ^ lnexp (x) ^ exp (x) -1 = ln p (p | c, 〇) P (p | cn = 1) (12) (13) n'e A (m) \ n [ Operation 3: Row Processing] (14) 20053452 & Sc Let 11 = 1 in the rows corresponding to n = 1, 2, ..., N in all (m, n) pairs, and let the logarithmic preset ratio β_ = 0. Equation 16 included in Equation 15 uses a variable m 'representing the position of the row to add the elements of the n-th row of all the columns other than the m-th column. Among them, after repeating operation 2 and operation 3 a predetermined number of times, operation 4 is performed next.

Pmn ~ Σ ^ m'n m * e B (n) \ m (15) m, eB (n) \ m (16)

[Operation 4: Decode codeword] In this operation, Equation 17 is used to record the nth row element rn (where n = 1, 2, ..., N) of the reproduction code r. Next, the end of this algorithm is declared. Equation 18, which is contained in Equation 17, uses a variable m 'representing the row position to add all the elements in the n-th row.

/ if sign qn + V f, if sign qn + X〇cm, n <m'e B (n) m 丨 € B (n) m'eB (n)) -1 (17) (18) The parity check matrix H is an example of a sum-product decoding method in Equation 6. Among them, operation 2 is repeated twice, and operation 4 is executed next. 19 (19) 20053436 ^ [Operation 1] βΐΐ = βΐ2 = βΐ4 = 〇022 = 卩 23 = 戸 25 = 〇β; 51 = 033 = Ρ; 36 = 〇 [Operation 2 (first time)] α ,!- (sign (q2) -sign (q4)) f (f (jq2 |) + f () q4 |)) `` 12 = (sign (q,) * sign (q4) X (f (jq) |) + f (jq4 |)) α 丨 4 ^ (sigi ^ qO-signCqjMfjq 丨 |) + f (jq2 |)) a36 = (sign (q)). sign (q3)) f (f 11) + f () q31) ) (20) [Operation 3] 13 1 β β β I 1 2 3 12 α α a [Operation 2 (second time)], α!] = (Sign (q2 + β12) · sign (q4 + β14) × (f〇q2 + β12 |) + f (| q4 + β14 |)) α12 = (sign (q) + β! i). sign (q4 + β14)) f (f + β !, |) + f ( q4 + β141)) α14 = (sigr ^ q) + β! 1). sign (q2 + β12)) f (fl + β, 11) + f () q2 + β121)) α36 = (signh + β31) Sign (q3 + β33) × (f ^ + β31 |) + f () q3 + β33 |)) (22) 20 2005343 &gt; & 5) c [operation 4] J〇, if sign (q 丨 + α &quot; + α31) = 1 U, if sign (qi + αΜ + α31) = -1

if sign (q2 + a 丨 2 + α 22) = 1 if sign (q2 + a12 + a22) = -l

if sign (q3 + a23 + a33) = l if sign (q3 + a23 + a33) = — 1

if sign (q6 + a36) = l if sign (q6 + a36) =-lr = | 0, if_ (qi + an + a 士 1 [1, ifsigi ^ + ajj + a 士 -1 [0, ifsign (q2 + a12 + a22) = l I) * '彳 (1, ifsign (q2 + a12 + a22) =-l (〇, ifsign (q3 + a23 + a33) = l.

[3 one 1

Msig4 + a23 + a33) = one 1 (0, ifsign (q6 + a36) = l i1, ifsign (q6 + a36) =-l FIG. 8 shows an LDpd encoder 20 according to an embodiment of the present invention. Circuit diagram. This circuit has a pipeline structure whose data flows from top to bottom, and continuous signals will be input to it. However, this 21 200534 ^ 26 &amp; Update the memory content. When calculating absolute values ^ lookup table (1⑻k-up table). Set to a positive value. The sign function can extract t = _ °: the product between tSignifi㈣_ can be easily taken by a kind of mutually exclusive logic冋 位 凡 ， The function symbol fights against frightening dog 1 and (exclusive logic sum) * rr shell% 0

The LDPC decoder 2Q shown in the two I® 8s will receive the estimated data q-order product decoding method, and output the reproduced Reed Solomon code r. Therefore, according to the block decoder 6 of this embodiment, the level difference Δ 'between the levels of the reproduction signal p is calculated to obtain the estimated data q, and the estimated data q is input to the LDPC decoder 20. False e reproduces the probability distribution (prObabiHty distribution) of the signal p corresponding to a Gaussian distribution with an average (average) of m and a variation of (σ2). Then, the regeneration can be calculated by formula .24 The probability density function of the signal p. When the differential code is used as the block code, the estimated data q in Equation 13 can be calculated from Equation 25. p (p) = "2π &amp; (p-m) 2] ~ 2 ^ \ (24) 22 20053i42i65c p (p | c, P (p | c = l)

q = In =, assuming the reproduction signal of the adjacent upper and lower pixels of the light receiver 5

The level M is calculated by formula 26, and multiplied by the proportion of the hanging number—tant Gf (see below), then the estimated data q can be calculated by formula 27. Among them, weaving ^ Δ = Ρ2-Ρι-2Δ (26) q = ^ (27) As described above, in this embodiment, by combining the block code and the LDpc code, it is possible to reproduce and record in a highly reliable manner. Ride the same renewable resources. In the reproduced page data reproduced from the holographic recording medium, the immunity level of individual pixels may be changed due to various disturbances, and therefore may have gray levels of village values. However, in this embodiment, since the level data of the regenerative dynamic tiger with multiple values = quasi-levels is used, the estimated data of the UPC code is effectively calculated, the error correction capability of the LDPC code can be improved, and the regeneration time can be reduced by this. Bit error rate for De Solomon codes. <Second Embodiment> 23, 200534 Hall In the first embodiment, the dragon motion code is used as the secret block code, and the two 'and σ are used as the 2 · 4 code. The coding rules for the 2: 4 code are shown in Figure 9. The example of page data is shown in Figure 10. The 'block decoder 6 compares the 隹 degree levels of 组成 which make up a 2: 4 codeword, and sets this image as 3 bits in the order of increasing brightness to P1, P2, P3, and P4. Among them, the level-difference Δ Ding is calculated by formula 28, formula 29, or formula. Δ = Ρ 丨-(ρ2 + ρ3 + ρ4) Δ = ： Pi-P2 (28) (29) (30), when the body is tested, the brightness level of the top pixel will be the highest. The reproduced block code 3 of the estimated value of the block code d can be obtained from the public cafe !, and the reproduced C code C, which is an estimated value of the LDPc code e, can be calculated by the formula 32. 0 1 0 0 [0 1] (31) Based on the estimated regenerated LDPC code system and the level difference, the estimated value of the first line of the regenerated service code is q2, which can be calculated by Equation 33. ^ Estimation 5 = _ code c, 0, when it is greater than the value of formula 13, it is a positive value, and: 24 20053i426Sc When the probability of cn = l is greater than the formula π, qn is a negative value. Therefore, in Equation 33, it is a positive value, and it is a negative value. 2Δ ° ί2 2Δ (33) As described above, the block decoder 6 according to this embodiment performs the following actions ... (1) From the pixels constituting the codeword, in the order of increasing brightness, select a predetermined number of Pixels; (2) decode the regeneration block by setting the selected pixel to "Γ", and set other pixels to ,, 0 ,,; ⑶ decode and regenerate the LDPC code according to the block code; By adding the brightness levels of the pixels set to ,,,,,, and subtracting the brightness levels of the pixels ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, and, and Δ; The absolute value of the estimated data q is proportional to the level difference Δ, and its polarity corresponds to the bits of the reproduction code. &Lt; Third Embodiment &gt;. F is nine of H huge Two of the pixels are T, and the other seven images have 9 ^ _5: 9 codes), which are used as block codes. An example of a coding rule for a 9-digit knife is shown in Figure u. Nine images iH: block decoder 5 will choose Jun Zhun h ^, two pixels that make up a 5: 9 codeword, and assume that the two of the selected two pixels 'Γ and the other seven pixels' The quasi-minor, respectively, are represented by the formula M, the formula%, or the power of 2. Because 8 can be expressed as 23, that is, it is convenient to perform division in digital circuits. See that 25 can be used as the denominator of the second term on the right side of Equation 35 and Equation 36. When the regeneration signal p passes the high_pass filter, the value of the second term on the right side of Equation 36 will be almost 0, and It can be removed, so the level difference A can be obtained from Equation 37. △ = (Pl + P2)-(P3 + P4 + P5 + P6 + P7 + p8 + p9) (34) Λ = Pl4 ~ P2 P3 ~ hp4 + p5 + Ρό + P7 + P8 + p0

2 T (35) (36) — In the 5: 9 code example, the number of pixel groups set to "!" Is 90-36, but the number of pixel groups used as block code words The number is. Therefore, 36-22 = 4 pixel groups are not in the codeword. For example, the 4 pixel groups shown in Figure 12 may not be used in the codeword. However, 'because blocks are allowed Decoder 6 selects two of the nine pixels that make up the 5: 9 codeword in the order of increasing brightness, so there will be a pixel group as shown in Figure 2. In this example, a reliable second estimate cannot be obtained Data, so the block solution '6 will be set to LDpc_device 20. In the example of 5: 9 code, because the nine pixels correspond to which c㈣ is reproduced, formula 38 is expected. At this moment, LDPC The decoder can use another-codeword estimation | data, perform RLDpc calculus action. Hi &lt; 13 q5] ^ [〇0 〇〇〇] (38) 26 200534 ^^ 5). In the playback device, the position of the pixels of the space adjuster and the pixels of the light receiver may be misaligned due to the deviation of the mechanical position of the optical system or the shrinkage of the hologram recording medium. In order to avoid performance degradation due to position mismatch, a technique called ^ ver-sampling may be used. In this oversampling technique, the pixels that are spatially adjusted to the pixels of the light receiver are not related. Correspond to each other at a ratio of 1 ·· 1, and correspond to a ratio relationship of, for example, 1: 4. Please refer to FIG. 13, the record f data is mapped to the reproduced page data twice, and the block = coder The four pixels of 6 indicate the bit of the recorded block code 4. The block decoder 6 can obtain a value obtained by adding the levels of the four pixel reproduction signals to obtain a pixel reproduction signal. To simplify For illustration, although in the above embodiment, it has been described that the code length N is 6, and the parity check code is an example obtained from Equation 6. However, the code length N of the code may be tens or hundreds of bits. In addition, for the sake of explanation, although it has been described previously that operation 2 will be repeatedly executed twice; ,,,:, and, and-product decoding method can be repeatedly executed four to dozens of times, and can be used with The above-mentioned example applies the present invention in a similar manner. However, the embodiments described above use the differential codes, 2: 4 codes, and 5: 9 codes as block codes, but the present invention is not limited to the above embodiments. T Although the estimated resources have been explained The level difference is 4 ratios, but the material q can also be any function of the level difference 4, and the function is compared according to the probability distribution of various disturbances of the recorded and regenerated device towels. Error: positive, not limited When only the Reed Solomon code can be used, and other Tian LDPC codes can be used, the correction ability is high enough, that is, the Reed Soloro 27 2005342i &amp; Sc gate code and other error correction codes are not required. + Because the holographic image recording and reproducing device and holographic image resetting of this issue, both will merge the block code and LDPC code, so it can reproduce the same reproduction data as the recorded data in a highly reliable manner. In the conventional full-image recording and reproduction device and the conventional full-image reproduction device, the signal-to-noise ratio of the reproduction signal is worsened by various interferences. However, in

According to the hologram recording and reproduction device and the hologram reproduction device, the bit error rate of the LDP raw Reed-Solomon code with strong error correction capability is used. Niu Ranan ― In addition, in the reproduced page data to be reproduced from the holographic recording medium, the brightness level of 2 pixels will be changed due to the disturbance of each stitch, and the brightness of the image will be within a continuous range. In the unit, unit, and hologram regeneration device according to the present invention, it is obtained by effectively calculating the difference between the two + values within the continuation range of the two example values. Therefore, the bit correction capability can be changed, and Reducing Reed Solomon _ Although the present invention has been disclosed in a preferred embodiment = invention 'anyone skilled in the art, will not be published = when some changes and decorations can be made, = = consumption * see attached application The patent scope shall prevail. Guarantee 4 [Schematic description] Figure 1 is a block diagram showing a conventional holographic processor. Signals in I'M clothes 28 20053452? 6δ〇〇 Figure 2 is a schematic diagram illustrating an example of the brightness level of individual pixels. FIG. 3 is a schematic diagram illustrating an example of data on a recording page. FIG. 4 is a schematic diagram showing an example of a data level of a recording page shown in FIG. 3. FIG. FIG. 5 is a schematic diagram illustrating an example of the reproduced page data. FIG. 6 is a schematic diagram showing an example of the reproduced page data level shown in FIG. 5. FIG. Fig. 7 is a block diagram of a signal processor in a holographic recording and reproducing apparatus according to an embodiment of the present invention. FIG. 8 is a circuit diagram of a low density parity check decoder according to an embodiment of the present invention. FIG. 9 is a schematic diagram showing an example of individual pixel brightness levels generated according to an embodiment of the present invention. FIG. 10 is a schematic diagram showing an example of data on a record page according to an embodiment of the present invention. ^ FIG. 11 is a schematic diagram showing an example of individual pixel brightness levels generated according to an embodiment of the present invention. FIG. 12 is a schematic diagram showing an example of data of a record page according to an embodiment of the present invention. FIG. 13 is a schematic diagram for explaining the relationship between recorded page data and reproduced page data according to another embodiment of the present invention. [Description of main component symbols] 1: Reed Solomon encoder 29 20053i42i6.Sc 2: Block encoder 3: Spatial adjuster 4: Holographic recording medium 5: Optical receiver 6: Block decoder 7: Reed Solomon Decoder 100: Hologram recording and reproduction device 100a: Hologram reproduction device 30

Claims (1)

2 Ο Ο 5 3 Scope of patent application: ι · A holographic recording and reproduction device, including a low start, degree parity check (LDPC) encoder, which uses LDPC codes to encode a record and generates _ Record the ldpc code: the block encoder 'it uses —block code, encodes the record l code, and generates a record block code; —hologram recording H' through the —target wire, irradiates — the recording medium, The data is reproduced on the above, and the brightness of the target beam is adjusted by the -space adjuster according to the recording block code; Gong Yue-hologram reproduction, which includes-a secret receiver, by irradiating-the beam to A reproduction beam obtained on the holographic recording medium is converted into a reproduction signal by P, and the data is reproduced; and two;-a block decoder 'according to a bit of the reproduction signal, —Regenerating block code, according to the regenerating block, a regenerating LDPC code whose code corresponds to the recorded LDPC code, and calculations — estimate the data to estimate the second LDPC code based on the level of the regenerating signal. ❹ 数 _ Recorded value of the post; and ~, one LD The PC and the encoder, based on the estimated data, decompose the LDPC code to decode the record data. 2. The hologram recording and resetting as described in the application for the scope of patent application, where an absolute value of the estimated data is related to the number of rotations that are obtained from the corresponding pixels obtained from the corresponding pixels of the light receiver. -Difference ratio. 3. The holographic recording and reproduction device described in item 2 of the scope of the patent application 31 200534a &amp; 5bc, wherein the polarity of the estimated data corresponds to the polarity of each of the bits of the reproduced LDPC code. 4. The holographic recording and reproduction device as described in item 1 of the scope of patent application, wherein the block encoder generates the recording block code so that M pixels out of the N pixels in the space adjuster Will be marked as ",", and (N-M) pixels of the N pixels will be marked as ,, 0 ,, (ν and M are natural numbers, and 5. The holographic recording and reproduction device described in item 4 of the scope of patent application, wherein the Rong block decoder will select the N pixels of the optical receiver in an order of increasing the level of the reproduction signal. Among them, ^ pixels are decoded by setting the selected M pixels to "1" and the (N-M) pixels to "0," 〇 · If you request the patent scope u 田田 乐 j sentry corpse &lt; / 王, 诼 i have recorded and reproduced the device, where the block decoder will be set to ,, Γ, the pixels of the Then add the signal levels, and set the pixels to "0," = the material yells, and calculate the data without any correlation and ^; quasi-proportion of the estimated data. 7. The hologram recording device as described in item 丨 of the scope of the patent application, wherein when the reproduced block code is not in the _Shima word of a block code, the reproduced LDpc decoded according to the reproduced block code The estimated data of the code: will be set to 0. Μ 8 · A holographic reproduction device, the information recorded in the holographic recorder by a holographic recorder for silk reproduction, and the holographic recorder includes a degree parity check (LDPC) encoder, which is Use an LDPC code to encode two 322005343 ^ S recorded data, and record the LDPC code with a block% ㊆;-block encoder, which is a code n code to record the record ⑶ heart, and generate a record The block recording media processor 'adjusts the target beam by irradiating the target beam onto the holographic space = two materials' and the brightness of the target beam passes through-including :. ° Adjusted according to the recording block code, and the holographic reproduction device beam: ΐ: two;-optical receiver, by converting-reference to: reproduction signal: then =: a reproduction beam obtained by photoelectricity -Block decoding H, root regeneration =, code-regenerating block code, according to the re-region = code corresponding to the recorded LDPC code-regenerating LDPC code, and calculating ^ Estimated shell material 'according to the The level of the reproduced signal, the estimated majority values of the individual bits; and, the LDPC decoder decodes the LDPC code based on the estimated data to decode the recorded data. 9. According to the holographic regeneration cracking described in item 8 of the scope of the patent application, an absolute value of the estimated data, the reproduction signal paid by the corresponding pixels of the #fish too eight polyphonic old receivers The difference between these levels is 10. The polarity of the estimated data is the hologram reproduction device described in item 9 of the scope of the patent application. The polarity of the estimated data corresponds to the polarity of each of the bits of the reproduced LDPC code. 0 Λ 11. The hologram reproduction device described in item 8 of the patent application, the block encoder will generate the recording block code, so that the n pixels in the 33 2005342 ^ 50c device are adjusted in the space. ] ^ Pixels will be marked as "ι", and (NM) of the N pixels will be marked as "0" (N and M are natural numbers, and N &gt; M). 12. The holographic reproduction device as described in item u of the scope of the patent application, wherein the block decoder selects one of the N pixels of the optical receiver in an order of increasing the level of the reproduction signal. M pixels, and the reproduced block codes are decoded by setting the selected M pixels to "1" and the (N-M) pixels to ,, 0 ". IJ · According to the holographic reproduction device described in item 12 of the scope of patent application, wherein the block decoder adds the levels of the reproduction signals of the pixels set to "1", and will be set to, The subtraction of the levels of the reproduction signals of the pixels, and the estimated data for calculating a ratio proportional to the levels of the additions and subtractions. 14. Please refer to item 8 of the scope of patents if you wish According to the hologram reproduction device, when the second block code is not in a code word of a block code, the estimated data corresponding to the corresponding bits ^ are reproduced according to the re-data ^ Wang Wangzuka record And reproduction devices, including:-Low-density parity check (LDPC) encoding, encoding a recording And produce ;; = a coupler can check a block encoder, which uses a% code, code, and generates a record block code; 4 horses, which encodes the record LDPC king image d recorder, The material will be reproduced on a recording medium; the target beam is irradiated with the brightness of a hologram 34 20053436 ^ c: the space adjuster adjusts the target beam medium according to the recording block code == 生;: Will :::: shot to the holographic record to regenerate the data; the regenerative beam n is converted into a -reproduced signal, and the second device decodes a regenerated block code to the library according to the -level of the regenerated signal ' According to the reproduced block code; LDPC㈣ estimates the majority values of the individual bits of the reproduced horse according to the level differences of the miscellaneous shouts; and a resolver decodes the LDPC according to the estimated data Code, set, record, and regenerate Dundan Ecology includes a light receiver. Set, and the hologram recording and reproduction described in item 16 of the installation of some pixels; the first receiver technology, Oversampling this regenerative asset with two types of increase = 3, 15 kinds of spicy mix and regenerative equipment As long as two: ir can be an arbitrary function distribution of the level difference of the reproduced data, it depends on the -probability setting of various interferences in the device, == 一 = the full-image recording and reproduction equipment 35 2005342 ^ 5〇〇21. If you set the four levels to these pixels respectively, the block code package: Yidi 5159: So: the full image recording and reproduction brightness increase,- In order, two of the nine pixels. The y-code—the codeword used in 22. It is set as described in item 16 of the scope of patent application, an absolute ratio of the estimated data in # 8. # 生 为 虎 的 _ -The difference between the levels is set, ^ = the overall image of the item 22 and the regenerative equipment around the 22nd item; the polarity 'corresponds to the setting of the second code 2 =, the 16th item of the patent scope The hologram recording disc is reproduced. Among the pixels, the (NM) pixel monogram t is not two and M is a natural number, and N> M). The W sequence is to select the N "two-" of the optical receiver and decode the reproduced block code by setting the (N-M) pixels to 36, 2005. 26. If the hologram recording and reproduction device described in item 25 of the scope of the patent application 'wherein the miscellaneous block decoding H will be set to "丨", the levels of the reproduction signals of the pixels are added, and the state is, , "G" subtracts the levels of the reproduction signals of the pixels, and calculates the estimated data that is proportional to the added over-levels.妁 位 27 · As described in the scope of application materials 帛 15 in the holographic recording and reproduction device ^. The reproduction block code is not in a code word of a block code, === horse decoding of the reproduction The estimated value of the corresponding bits of the coffee code will be set to zero. 28. If you apply for the 15th pin-shaped hologram recording and resetting application, the block decoder calculates the level difference in the reproduction signal to obtain the reference data. The LDPC encoder described in item 15 of the 2 Lili range, wherein the LDPC encoder generates the recorded LDPC code by multiplying an input data by a matrix. Health Miao Ershen. The LDPC decoder in the hologram recording and reproduction device described in the monthly patent scope of $ 15 uses one type of LDPC code. liver'.豕 ® ^ As ^ Zhuan Wei _ 3Q the prerequisites for holographic recording and reproduction wear are as follows, decoding-w holographic recording and reproduction vibration described in item 15 of the patent scope, ~ LDPC decoding n Includes the circuit structure that allows the input of most continuous data. 33. If the scope of the patent application is set to μ, the decoder includes a #, hologram recording and reproduction signal input to its order, and allows a plurality of consecutive to update a memory content. Even # ,,,. The results can be fed back to them, and two: and generate-record Reed-Solomon codes; ,, and flat codes: a recorded Reed-Solomon dual parity check (LDPC) code; and "birth-record low-density odd-coded records LDPC code, and record the majority of the majority of the corresponding pixels &amp; ^ Record £ block code 'recording medium, and / or from the hologram-no light beam, to a hologram like these # 目 秦 ,,, n video recording media, the sub-blocks that intercept the individual pixels have a record page data corresponding to a checkerboard pattern of the record block code; convert the record page data into a reproduction signal; μ According to the remote reproduction signal For these levels, the decoding corresponds to the recording block :, the reproduction block code, and according to the reproduction block code, the decoding-regeneration LDPC code corresponding to the record, the 'n LDPC code, and the calculation-estimation data are calculated based on In order to reproduce the levels of the roar, mark the accuracy of the individual bits of the reproduced Lope code; and decode the LDpc code based on the estimated data, and generate a reproduced Reed-Solomon code; and ~ code violation reproduction Reed Solomon yards, and Generate a reproduction data. 35. As described in item 34 of the scope of the patent application for full image data processing and 38 20053i42 | 6. ^ c: encoding method of the record data package code 'encoding the record Reed-Solomon code' in the method of production #, the record LDPC The code includes the use-^^ use-LDPC code, which encodes Solo m.i &gt; Baidu Duro ... one: one 'and decoding the reproduced Reed-Solomon code includes the use-Reed-Solomon code. Device for generating I and f codes, which includes-holographic regeneration, the encoding and decoding device includes: a low-density parity check (LDPC) encoding field for encoding a record data, and generates a Recording code; A block encoder, which uses a single block to generate and record block codes; °° Ghost Horse ',,, and oblique recording codes, and Na ==: _ HAI regenerates most of the level differences of the signal, solve ~ Based on the recorded regeneration code of a block of stone horse, the block corresponding to the recorded code is decoded according to the data in order to regenerate the block according to the regenerative signal: and calculate the majority value of an estimated number of individual bits. ; Frequency difference 'estimates the one more LDPC decoder for the regenerated code, and decodes the aeronautical data according to ·.料 ㈣ ’decode the record code, 39