WO2007114029A1 - 2次元復調方法、2次元復調装置及びホログラム装置 - Google Patents
2次元復調方法、2次元復調装置及びホログラム装置 Download PDFInfo
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- WO2007114029A1 WO2007114029A1 PCT/JP2007/055407 JP2007055407W WO2007114029A1 WO 2007114029 A1 WO2007114029 A1 WO 2007114029A1 JP 2007055407 W JP2007055407 W JP 2007055407W WO 2007114029 A1 WO2007114029 A1 WO 2007114029A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
- G11B2020/1863—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information wherein the Viterbi algorithm is used for decoding the error correcting code
Definitions
- Two-dimensional demodulation method Two-dimensional demodulation device, and hologram device
- the present invention relates to a two-dimensional demodulation method and a two-dimensional demodulation device, and more particularly to a memory system in which information recording or information reproduction is optically performed on a recording medium.
- a hologram memory system As a memory system, a hologram memory system is known in which information recording or information reproduction is optically performed on a powerful hologram recording medium such as a photopolymer.
- a hologram memory system when data is recorded on a hologram recording medium (hereinafter simply referred to as a recording medium), two-dimensional modulation is performed based on the input data, and the unit is called a data page, which is two-dimensional data. Is displayed on a spatial light modulator in which a plurality of modulation pixels are two-dimensionally arranged, and thereby the light is spatially modulated to generate signal light. The signal light and the reference light are caused to interfere in the recording medium, and the interference fringes are recorded on the recording medium.
- reproduction light (diffracted light) is generated by irradiating the recording portion of the recording medium with only reference light under the same conditions as at the time of recording.
- the reproduced image to be imaged is received by the image sensor, and the original data page is reproduced.
- the powerful decision feedback Viterbi detection process taking advantage of the fact that the data to be handled is two-dimensional, for example, a matrix type image sensor configured by arranging a large number of light receiving pixels in a rectangular shape is used. Assuming that the playback process is performed correctly in the line above the current line (the line of light receiving pixels), the effect of the line above is subtracted and the output signal from the current line is subtracted. Then, the Viterbi detection process is performed, that is, the Viterbi detection process is executed using the transition of the change in the column direction by performing the determination feedback in the column direction.
- the input data when the input data is reproduced based on the output signal received in the uppermost row, it is known that the amount of light received in the upper row (virtual row) of the uppermost row is zero. , Exit from the topmost row
- the input data is reproduced based on the input signal, it is reproduced as it is and no decision feedback is given.
- the input data is reproduced based on the power output signal of the second row from the top, the influence of the uppermost row on the uppermost row is affected by the output signal on the uppermost row. Assuming that the input data that has not been received has been reproduced, it is reproduced by subtracting the effect of the input data in the uppermost row.
- the input data is reproduced based on the output signal of the third line of power
- it is assumed that the input data is accurately reproduced based on the output signal in the second line from the top.
- the direction of the Viterbi detection process is, for example, the left force is also performed in the row direction to the right in the image sensor, and the direction of the determination feedback is the column direction.
- Viterbi detection is described in paragraphs (0120) to (0120) and the corresponding trellis diagrams described in Patent Document 2, but each state is measured using the measured value rk at time k as the Viterbi detection result.
- a metric calculation is performed for each pixel (1 bit) unit, and a path metric with the minimum total combination force is selected, and the state value that constitutes the surviving path becomes the detection result of this line.
- Two-dimensional modulation such as 1: 2 differential code, 2: 4 differential code, 4: 8, or 6: 8 balance code is used to prevent an increase in errors during pixel discrimination of the data page.
- Two-dimensional modulation is a two-dimensional code that generates a bit pattern in which two types of information bits, ON (bright) and OFF (dark), are arranged two-dimensionally. Some of the data bits to be recorded are Is converted into a unit symbol (two-dimensional modulation pattern symbol) having a predetermined number of pixel forces in the spatial light modulator, and the input data is converted as a set of a plurality of unit symbols.
- Patent Document 1 U.S. Pat.No. 5,740,184
- Patent Document 2 Japanese Patent Laid-Open No. 11 317084
- Patent Document 3 Japanese Patent Laid-Open No. 2001-75463
- the detection result is a unit symbol of the two-dimensional modulation rule (two-dimensional) in order to advance the detection process by one pixel. There was a possibility that it would not match the modulation pattern symbol.
- the determination feedback Viterbi detection result is a code of a two-dimensional modulation pattern symbol.
- the pixel shift is detected in advance before the data is reproduced by the detection feedback Viterbi detection. For example, it was detected only once when the power was turned on or when the recording medium was replaced. In hologram reproduction, the irradiation position of the reproduction light (reproduction image) to the image sensor may actually move because the recording medium is moved or the angle of the reference light is changed. The transfer function will change. In such a case, there was also a problem that the detection return Viterbi detection did not work well and errors increased.
- the two-dimensional demodulation method of the present invention uses a maximum likelihood decoding process from a recording medium on which a data page is recorded as a set of a plurality of two-dimensionally modulated symbol symbols each consisting of a plurality of pixels.
- the two-dimensional demodulator performs maximum likelihood decoding processing from a recording medium on which a data page is recorded as a set of a plurality of two-dimensionally modulated symbol symbols each of which is composed of a plurality of pixels.
- the hologram apparatus of the present invention uses a maximum likelihood decoding process to record the data page from a recording medium on which the data page is recorded as a set of a plurality of two-dimensionally modulated symbol symbols each including a plurality of pixels.
- a hologram apparatus for reproducing an image sensor
- Means for performing maximum likelihood decoding for each of the signal symbol data in accordance with the pixel shift value Means for performing maximum likelihood decoding for each of the signal symbol data in accordance with the pixel shift value.
- Maximum likelihood decoding is most probable based on the correlation, if the restored signal is not a direct representation of the original bit string but has a correlation with the preceding signal. (Maximum Likelihood) That is, the probability is high! The bit code is guessed and the original code is detected.
- FIG. 1 is a schematic configuration diagram showing a hologram recording / reproducing system according to an embodiment of the present invention.
- FIG. 2 is a diagram for explaining a 2: 4 modulation two-dimensional modulation table that is used in the two-dimensional demodulation method according to the embodiment of the present invention.
- FIG. 3 is a partial front view showing an outline of a spatial light modulator in a hologram apparatus for recording information on a hologram recording medium according to an embodiment of the present invention.
- FIG. 4 is a partial front view showing a reproduced image on the light receiving element of the image sensor in the hologram memory system according to the embodiment of the present invention.
- FIG. 5 is a flowchart of data page reproduction processing according to the embodiment of the present invention.
- FIG. 6 A 4-bit signal symbol for data page reproduction processing according to the embodiment of the present invention. It is a conceptual diagram explaining vol data.
- FIG. 7 is a conceptual diagram illustrating the relationship between a reproduced image, an image symbol and a signal symbol in the light receiving area of the image sensor according to the embodiment of the present invention.
- FIG. 8 is a conceptual diagram illustrating the relationship between image symbols and signal symbols according to an embodiment of the present invention.
- FIG. 9 is a trellis diagram by detection feedback Viterbi detection for each two-dimensional modulation pattern symbol of the embodiment according to the present invention.
- FIG. 10 is a conceptual diagram illustrating the relationship between image symbols and signal symbols according to another embodiment of the present invention.
- FIG. 11 is a diagram for explaining a 1: 2 modulation two-dimensional modulation table according to a two-dimensional demodulation method of another embodiment of the present invention.
- FIG. 12 is a diagram for explaining a part of a two-dimensional modulation table of 5: 9 modulation according to the two-dimensional demodulation method of another embodiment of the present invention.
- FIG. 13 is a diagram for explaining a part of a 6: 9 modulation two-dimensional modulation table according to the two-dimensional demodulation method of another embodiment of the present invention.
- FIG. 1 shows an example of a hologram device for recording and / or reproducing information as a hologram memory system.
- a half mirror HM On the optical path of the coherent laser beam 12 emitted from the laser light source LD, a half mirror HM, a shirtta SH, a beam expander BX, a transmissive spatial light modulator SLM, an objective lens 16, a photopolymer A recording medium 10, such as a second lens 21, and an image sensor 20 are disposed.
- the half mirror HM generates reference light by dividing the laser light 12, and functions as a reference light optical system together with the reflection mirrors RM1 and RM2.
- the shatter SH is controlled by the controller 32 and controls the irradiation time of the light beam to the recording medium 10.
- the beam expander BX expands the diameter of the light that has passed through the shatter SH to be a parallel light beam and irradiates the spatial light modulator SLM.
- the spatial light modulator SLM is a liquid crystal display (LCD) panel having a matrix arrangement in which a plurality of modulation pixels are two-dimensionally arranged.
- the spatial light modulator SLM has, for example, vertical 480 x horizontal 640 pixels, displays the data page from the encoder 25, and optically modulates the irradiated light into spatial ON and OFF signals, and becomes the signal light 12a.
- the encoder 25 to which the data DATA to be recorded is supplied is controlled by the controller 32.
- the objective lens 16 performs Fourier transform on the signal light 12a and condenses the focal point behind the mounting position of the recording medium 10.
- the recording medium 10 is mounted on the support unit 60.
- the reflection mirror RM2 of the reference light optical system irradiates the recording medium 10 with the reference light 12 at a predetermined incident angle. Due to the action of the reflection mirror RM2, the reference light 12 crosses the signal light 12a at a predetermined angle inside the recording medium 10.
- the intersecting signal light and reference light interfere in the recording medium 10, and the interference fringes are stored in the recording medium 10 as a refractive index grating, whereby the data page is recorded. Also, By changing the crossing angle between the signal light and the reference light, multiple angle recording of a plurality of data pages becomes possible.
- the image sensor 20 includes a CCD (charge coupled device) in which a plurality of light receiving elements corresponding to the spatial light modulator pixels are two-dimensionally arranged, an array such as a complementary metal oxide film semiconductor device, and the like. Is done. Further, a decoder 26 is connected to the image sensor 20. Decoder 26 is connected to controller 32. The light receiving elements of the image sensor 20 and the pixels of the spatial light modulator do not need to correspond one-to-one. The image of the data page displayed on the spatial light modulator, especially the number and arrangement of the light receiving elements that can be distinguished from each pixel. Have it! /.
- CCD charge coupled device
- the signal light is blocked by the shirter SH, and only the reference light is incident at the same crossing angle as at the time of recording.
- Reproduction light (diffracted light) corresponding to the recorded signal light appears on the side opposite to the incident side of the recording medium 10 irradiated with the reference light.
- the reproduction light is guided to the image sensor 20 through the second lens 21.
- the image sensor 20 receives the reconstructed image from the reconstructed light and reconverts it into an electrical reconstructed image signal
- the data DATA is sent to the controller 32 via the decoder 26, and the controller 32 receives the original input data. Played.
- 2: 4 modulation is executed at the time of recording as two-dimensional modulation for hologram recording.
- 4 modulation when a data page to be recorded is determined by passing laser light through the spatial light modulator SLM, four adjacent modulation pixels of the spatial light modulator SLM are combined into one set. One-fourth of the number of pixels that make up the light transmits light, and three-fourths of the pixels block light.
- the two-dimensional modulation pattern symbol consists of four pixels of the spatial light modulator SLM, only one of which transmits light, and the other three pixels Block out light.
- FIG. 3 shows a partial front view of the spatial light modulator SLM displaying a powerful data page.
- the light / dark dot pattern is displayed when each cell is turned on (bright) and off (dark), and becomes a transparent or non-transmissive pattern.
- the spatial light modulator SLM displays data (a set of two-dimensional modulation pattern symbols) in the central data area DR, and displays the positioning mark LM, for example, at its four corners.
- the transmissive spatial light modulator SLM is a liquid crystal panel with an analyzer having a plurality of pixel electrodes divided in a matrix and is electrically controlled by the controller 32 via the encoder 25.
- the light receiving area of the image sensor is played back because the irradiation position of the playback image fluctuates due to the movement of the recording medium to play each page, and the attachment position is adjusted. It is selected so that it is slightly wider than the area irradiated with the image. Therefore, it is necessary to specify the area irradiated with the reproduced image from the image sensor output.
- the positioning mark LM for detecting the data position together with the modulated data as shown in Fig. 3 is placed in the page (in the figure, only one positioning mark LM at the top left of the page) Put it in the corner).
- FIG. 4 shows 4 ⁇ 4 portions of the light receiving elements of the image sensor 20 in the hologram memory system.
- dx and dy are pixel shifts between a light-receiving element and a reconstructed pixel image image (or a spatial light modulator, indicated by a broken line with light and dark reversed). Since there is a two-dimensional inter-pixel interference due to optical transfer characteristics such as pixel shift and point spread function characteristics, the original input data cannot be accurately reproduced.
- the maximum likelihood decoding process for each symbol corresponding to a two-dimensional modulation pattern symbol such as 2: 4 modulation, which is extended to two dimensions by using detection feedback Viterbi detection for each pixel, for example, decision feedback Viterbi Perform detection.
- FIG. 5 shows a flowchart of the data page reproduction process in the two-dimensional demodulator using decision feedback Viterbi detection.
- the recording medium on which the data page is recorded is irradiated with reference light, and the reproduction light that appears in the recording medium force is received by the image sensor to acquire the data page signal.
- the position of the positioning mark is first detected from the data page signal (step Sl).
- the position of the positioning mark is detected by performing a correlation calculation between a known positioning mark template and a predetermined portion of the data page signal for each position of the predetermined portion of the data page signal, and determining the position where the correlation value is maximized.
- the position of the positioning mark is a pixel coordinate (integer coordinate).
- step S2 pixel shifts dx and dy between the reproduction pixel and the light receiving element shown in FIG. 4 are detected (step S2).
- This is the relative position deviation from the integer coordinates detected in S1, and becomes the decimal point coordinates.
- the right direction and the downward direction are positive, and the left direction and the upward direction are negative.
- This pixel shift detection can be performed by calculating the center of gravity from the maximum correlation value calculated in step S1 and the surrounding correlation values.
- the start and end points of Viterbi detection and the direction of decision feedback are determined from the integer coordinates and decimal point coordinates calculated in steps Sl and S2.
- step S3 the output signal of the image sensor indicating the reproduced image is blocked according to the 2: 4 modulation two-dimensional modulation pattern symbol and divided into signal symbol data.
- the signal is divided into two pixels, ie, a signal symbol syd consisting of 4 bits (column direction (judgment feedback direction DF from top to bottom) and row direction (Viterbi detection direction VA to the left and right)). (4 bits) This is to detect Viterbi for each data unit.
- Reconstructed image (developed in the memory space of the device) indicated by the output signal of the image sensor
- Dividing into signal symbols for each volt can be realized, for example, by dividing the output signal of one data page into equal symbols by dividing the output signal at a predetermined number of bits at equal intervals. That is, signal symbol data is set by blocking the output signal of the image sensor according to the two-dimensional modulation pattern symbol.
- the 2: 4 modulation symbol corresponding to the received light signal to be measured is called a signal symbol
- the 2: 4 modulation symbol consisting of the reproduced pixel image is called an image symbol.
- Figure 7 shows an example of the relationship between the reconstructed image and the light receiving area of the image sensor. The broken line represents the reconstructed image, and the solid line represents the light receiving area of the image sensor.
- Y is an image symbol that also has four reconstructed pixel image forces
- S is a received light signal to be measured, that is, a signal symbol.
- i is the row number
- j is the column number.
- the reproduced images are grouped for each image symbol as shown in FIG.
- the reproduced image is divided into image symbol length 2 X width 2 pixels, and the image symbol Y and the signal symbol S have the same size.
- the number of symbols per row is such that the signal symbol S is one more than the image symbol Y.
- a reference signal R is calculated according to the pixel shift (step S4).
- the output of each light receiving element is considered to be proportional to the area of the reproduced image input to the element. Therefore, if dx and dy are the pixel shift values in the horizontal and vertical directions, respectively, the transfer function H of the pixel shift is as follows.
- various reference signals R can be calculated in advance according to the pixel shift.
- the reference signal R at that time is calculated by the above-described calculation formula.
- determination feedback Viterbi detection processing is performed based on the pixel shift amount (step S5). Determination Feedback Viterbi detection processing will be described later.
- step S6 it is determined whether or not playback of the data page is continued. If it is continued, the process returns to step S1, and if playback is completed, the process ends.
- a reference signal is calculated in advance before the reproduction process and stored in a storage device such as a memory, and instead of calculating the reference signal during the reproduction process, the reference signal is read from the storage device and determined. Feedback Viterbi detection may be performed.
- the reference signal conversion table indicating the reference signal for the pixel shift value is created and stored, that is, the reference signal is calculated in advance and stored in the storage device, so the amount of calculation at the time of Viterbi detection is reduced. Can be reduced.
- image symbols and signal symbols of the same size in other two-dimensional modulation pattern symbols is not limited to 2: 4 modulation. This is effective for detecting Viterbi.
- V even if it is shifted, a plurality of reference signals corresponding to a plurality of predetermined pixel shift values are calculated for each of the image symbols! It is stored in a storage device such as (Access Memory) (reference signal conversion table).
- a storage device such as (Access Memory) (reference signal conversion table).
- Viterbi demodulation is performed by referring to the reference signal conversion table of the storage device with the reference signal corresponding to the detected pixel shift value and the data in the uppermost row shown in FIG.
- the uppermost row shown in FIG. 7 is detected, the uppermost row is a black V portion that is not irradiated with the reproduction light, and therefore is all black.
- the reference signal R is determined.
- the pixel is black.
- FIG. 9 shows the relationship between the image symbol Y and the image symbol Y on the left side of this embodiment.
- FIG. 10 is a trellis diagram by determination feedback Viterbi detection for each dimension modulation pattern symbol.
- the number of states of the image symbol IMAGE SYMBOL in this trellis diagram corresponds to the number of two-dimensional modulation pattern symbols shown in Fig. 2.
- the state values StateO, 1, 2, and 3 correspond to the two-dimensional modulation rule, that is, the input data 00, 01, 10, and 11 in FIG.
- the number of patterns of 2 vertical x 2 horizontal pixels (2: 4 modulation symbol size) is 16 types. Only 4 patterns shown in Fig. 2 are selected as the state of the trellis diagram.
- the state full black pattern
- the reference signal R of the combination of image symbols Y and Y (16 types) is read from the storage device.
- the branch metric represents the correlation between the symbol combination (reference signal) and the actual reproduced image.
- the no metric is equivalent to connecting the branch metrics, that is, the correlation of the entire symbol string in one row.
- a method of selecting the smallest path metric from all the combinations is performed by the Viterbi algorithm.
- ij 00 01 10 r represents the pixels that make up the reference signal, and s, s, s, and s of S make up the signal symbol
- the comparison between the reference signal and the actual signal to be measured is performed for each two-dimensional modulation pattern symbol.
- the metric calculation at this time is based on the reference signal.
- the Viterbi detection result is two-dimensionally modulated. Be sure to meet the rules. As a result, the error rate is improved compared to the Viterbi detection for each pixel.
- the force considered that the amount of light received in the uppermost row of the portion irradiated with the reproduced image or the lowermost row of the lowermost row is considered to be zero.
- the error rate can be improved by considering the part before the first image symbol and the part behind the last image symbol as Vitrebi detection as a part not irradiated with reproduction light.
- the reference signal for detecting Viterbi is created in advance by a combination of pixel shifts in the vertical and horizontal directions, and pixel shift detection is performed each time a data page is reproduced, and the corresponding reference signal is displayed. Refer to it and reflect it in Viterbi detection. This allows you to move the recording medium or Viterbi detection works well even when the playback light irradiation position moves slightly due to reasons such as changing the illumination angle.
- Branch metric calculation is also performed on the right side of the image symbol Y.
- Micromax indicates the number of bits of the input data
- New shows the number of pixels of the modulation pattern
- the modulation pattern number becomes 2 Micromax.
- 5 9 modulation
- Viterbi detection is advanced every 3 pixels in both the column and row directions.
- 6 9 modulation
- Viterbi detection is advanced every 3 pixels in both the column and row directions.
- the number of states at this time 64
- Figure 11 shows the two-dimensional modulation table for 1: 2 modulation.
- Figure 12 shows a two-dimensional modulation table with 5: 9 modulation.
- Figure 13 shows a two-dimensional modulation table for 6: 9 modulation.
- the determination feedback direction is from top to bottom, and the Viterbi detection direction is from left to right.
- change the judgment feedback direction from bottom to top and the Viterbi detection direction to the right force to the left.
- the power described for the hologram memory system using the hologram recording medium as the two-dimensional demodulator is not limited to this.
- the present invention is not limited thereto. It can also be applied to a two-dimensional demodulator such as a two-dimensional code reader.
- the power described in the example of decision feedback Viterbi detection as the maximum likelihood decoding process for each symbol for example, BCJR decoding (LR Bahl, J. Cocke, F. Jelinek, and J. Raviv, Optimal decoding or linear codes for minimizing symool err or rate, "-IEEE Transactions on Information Theory, March. 1974, pp284-287) has the same effect.
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JP2008508492A JP4741000B2 (ja) | 2006-03-31 | 2007-03-16 | 2次元復調方法、2次元復調装置及びホログラム装置 |
US12/295,597 US7907496B2 (en) | 2006-03-31 | 2007-03-16 | Two-dimensional demodulation method, two-dimensional demodulation apparatus and holographic apparatus |
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JP2014089779A (ja) * | 2012-10-29 | 2014-05-15 | Nippon Hoso Kyokai <Nhk> | 2次元符号復号装置およびそのプログラム、ならびに、ホログラム記録再生装置 |
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JP5081741B2 (ja) | 2008-06-20 | 2012-11-28 | 株式会社日立製作所 | 光情報記録装置、光情報記録方法、光情報記録再生装置および光情報記録再生方法 |
TW201006247A (en) * | 2008-07-17 | 2010-02-01 | Ind Tech Res Inst | Holographic data storing method and storing device |
EP2518687B1 (en) * | 2011-04-26 | 2013-04-24 | FEI Company | Method for determining a reconstructed image using a particle-optical apparatus |
EP2806378B1 (en) | 2013-05-21 | 2015-07-08 | Thomson Licensing | Method, apparatus and storage medium for two-dimensional data storage |
JP2015060613A (ja) * | 2013-09-20 | 2015-03-30 | 株式会社日立エルジーデータストレージ | 光情報記録装置および光情報記録方法 |
US10641934B2 (en) * | 2017-03-24 | 2020-05-05 | Rambus Inc. | Methods and systems for distinguishing point sources |
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KR100574050B1 (ko) * | 2003-05-03 | 2006-04-27 | 삼성전자주식회사 | 홀로그램 정보저장장치용 서보 컨트롤 |
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- 2007-03-16 WO PCT/JP2007/055407 patent/WO2007114029A1/ja active Application Filing
- 2007-03-16 JP JP2008508492A patent/JP4741000B2/ja not_active Expired - Fee Related
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JP2006252701A (ja) * | 2005-03-11 | 2006-09-21 | Tokyo Univ Of Science | ビタビ復号装置、方法及びプログラム |
JP2006259817A (ja) * | 2005-03-15 | 2006-09-28 | Matsushita Electric Ind Co Ltd | デジタルイメージ2値化装置、デジタルイメージ2値化方法及びデジタルデータ再生装置 |
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JP2014089779A (ja) * | 2012-10-29 | 2014-05-15 | Nippon Hoso Kyokai <Nhk> | 2次元符号復号装置およびそのプログラム、ならびに、ホログラム記録再生装置 |
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JP4741000B2 (ja) | 2011-08-03 |
JPWO2007114029A1 (ja) | 2009-08-13 |
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