Magnetic reproduction processing apparatus, magnetic recording and reproduction apparatus, and magnetic reproduction method

Abstract

The invention provides a magnetic reproduction processing device, a magnetic recording and reproducing device and a magnetic reproduction method capable of suppressing errors. According to an embodiment, a magnetic reproduction processing apparatus includes a decoder and an error correction decoder. A first signal based on a reproduced signal is input to the decoder. A signal based on the second signal output from the decoder is input to the error correction decoder. The error correction decoder corrects an error of the second signal on the basis of a check matrix. The decoder includes a neural network layer. The neural network layer comprises a plurality of computing nodes. The connection relationship of the plurality of computing nodes is based on the check matrix.

Description

[0001] This application is based on Japanese Patent Application No. 2023-114410 (filing date July 12, 2023) and claims priority from the aforementioned application, and the present application incorporates the entire contents of the aforementioned application by reference. Technical Field

[0002] Embodiments of the present invention relate to a magnetic reproduction processing device, a magnetic recording and reproduction device, and a magnetic reproduction method. Background Art

[0003] For example, fewer errors are desired in magnetic reproduction processing devices. Summary of the invention

[0004] Embodiments of the present invention provide a magnetic reproduction processing device, a magnetic recording and reproduction device, and a magnetic reproduction method capable of suppressing errors.

[0005] According to an embodiment of the present invention, a magnetic reproduction processing device includes a decoder and an error correction decoder. A first signal based on a reproduced signal is input to the decoder. A signal based on a second signal output from the decoder is input to the error correction decoder. The error correction decoder corrects errors in the second signal based on a check matrix. The decoder includes a neural network layer. The neural network layer includes a plurality of computing nodes. The connection relationship between the plurality of computing nodes is based on the check matrix.

[0006] According to the magnetic reproduction processing device having the above-mentioned structure, it is possible to provide a magnetic reproduction processing device, a magnetic recording and reproduction device, and a magnetic reproduction method capable of suppressing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic diagram illustrating a magnetic reproduction processing device and a magnetic recording and reproduction device according to the first embodiment.

[0008] Figure 2 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0009] Figure 3 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0010] Figure 4 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0011] Figure 5 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0012] Figure 6 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0013] Figure 7 It is a schematic diagram of a magnetic reproduction processing device involved in an exemplary embodiment.

[0014]

Number Description

[0015] 71: decoder, 71L: neural network layer, 71N: computing node, 72: error correction decoder, 73: waveform equalizer, 74a, 74b: first maximum likelihood decoder, second maximum likelihood decoder, 75L: first likelihood ratio information, 75P: bit position information, 75W: waveform information, 76d: display device, 76f: interface circuit, 76i: input device, 76m: storage circuit, 76p: processing circuit, 77M: storage unit, 77a to 77b: 7c: 1st storage area~3rd storage area, 80: magnetic recording medium, 80D: magnetic recording and reproducing unit, 80H: magnetic head, 80R: recording and reproducing unit, 110~112, 120~122: magnetic reproducing processing device, 210: magnetic recording and reproducing device, N1~N6: 1st node~6th node, S1, S2: 1st signal, 2nd signal, Sig-c: decoding signal, Sig-r: reproducing signal, α1: 1st likelihood ratio group, α2: likelihood ratio group. DETAILED DESCRIPTION

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] The drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the size between parts, etc. are not necessarily the same as in reality. Even when the same part is shown, the size and ratio may be shown differently depending on the drawings.

[0018] In the present specification and each drawing, the same reference numerals are used for the same elements as those already described with respect to the drawings that have already appeared, and detailed description thereof will be appropriately omitted.

[0019] (First embodiment)

[0020] Figure 1 It is a schematic diagram illustrating a magnetic reproduction processing device and a magnetic recording and reproduction device according to the first embodiment.

[0021] like Figure 1 As shown, the magnetic recording and reproducing device 210 according to the embodiment includes the magnetic reproducing processing device 110 according to the embodiment. The magnetic recording and reproducing device 210 may further include a magnetic recording and reproducing unit 80D.

[0022] The magnetic recording and reproducing unit 80D includes a magnetic recording medium 80. The magnetic recording medium 80 may include, for example, a magnetic disk (HDD: Hard Disk Drive) or the like. The magnetic recording and reproducing unit 80D may also include, for example, an SSD (Solid State Drive). The magnetic recording and reproducing unit 80D may also include, for example, a recording and reproducing unit 80R. The recording and reproducing unit 80R may include, for example, a magnetic head 80H. Information is recorded on the magnetic recording medium 80 by the recording and reproducing unit 80R (magnetic head 80H). The information recorded on the magnetic recording medium 80 is reproduced by the recording and reproducing unit 80R (magnetic head 80H). A reproduction signal Sig-r is obtained from the recording and reproducing unit 80R. The reproduction signal Sig-r may be, for example, a signal that is continuous or discontinuous in time series.

[0023] The reproduced signal Sig-r obtained by the magnetic recording and reproducing unit 80D (recording and reproducing unit 80R) is supplied to the magnetic reproducing processing device 110. The reproduced signal Sig-r is processed (decoded) in the magnetic reproducing processing device 110. The result of the processing (decoding) by the magnetic reproducing processing device 110 is output from the magnetic reproducing processing device 110 as a decoded signal Sig-c. The decoded signal Sig-c is, for example, a binary signal.

[0024] The magnetic reproduction processing device 110 includes a decoder 71 and an error correction decoder 72. The decoder 71 receives a first signal S1 based on the reproduction signal Sig-r. The error correction decoder 72 receives a signal based on a second signal S2 output from the decoder 71.

[0025] The error correction decoder 72 is configured to correct errors in the second signal S2 based on the check matrix H. In this example, the check matrix H is a matrix corresponding to 6 bits.

[0026] The decoder 71 includes a neural network layer 71L. The neural network layer 71L includes a plurality of computing nodes 71N. In this example, the number of the plurality of computing nodes 71N is 6. The number of the plurality of computing nodes 71N corresponds to the number of the plurality of bits in the check matrix H. In this example, the plurality of computing nodes 71N includes a first node N1, a second node N2, a third node N3, a fourth node N4, a fifth node N5, and a sixth node N6.

[0027] In the embodiment, the connection relationship of the plurality of computing nodes 71N is based on the check matrix H. In this example, the first node N1 is connected to the second node N2 and the third node N3. The second node N2 is connected to the first node N1 and the third node N3. The third node N3 is connected to the first node N1, the second node N2, and the fourth node N4. The fourth node N4 is connected to the third node N3, the fifth node N5, and the sixth node N6. The fifth node N5 is connected to the fourth node N4 and the sixth node N6. The sixth node N6 is connected to the fourth node N4 and the fifth node N5.

[0028] In the embodiment, the connection relationship of the plurality of computing nodes 71N is based on the check matrix H used in the error correction decoder 72. Thus, a lower BER (Bit error rate) can be obtained. According to the embodiment, a magnetic reproduction processing device capable of suppressing errors can be provided. High-precision decoding can be performed.

[0029] In an embodiment, the decoder 71 may be, for example, a GNN (Graph neural network). In the GNN, for example, machine learning is performed. In an embodiment, the error correction decoder 72 may include, for example, an LDPC (Low-Density Parity-Check Codes) decoder. High-precision decoding can be implemented.

[0030] In an embodiment, the reproduced signal Sig-r includes waveform information 75W, bit position information 75P, and first likelihood ratio information 75L. The waveform information 75W includes information about the waveforms before and after the bit of interest. For example, the waveform information 75W includes the first waveform of the first bit, the second waveform of the second bit before the first bit, and the third waveform of the third bit after the first bit. The second bit before the first bit may include multiple bits. The third bit after the first bit may include multiple bits. The bit position information 75P includes the position information of the first bit. The bit position information 75P includes, for example, information about which bit it is.

[0031] The first likelihood ratio information 75L includes information about the likelihood ratios (first likelihood ratio group α1) of each of the plurality of computation nodes 71N (i.e., a plurality of bits). The first likelihood ratio group α1 includes likelihood ratios related to each of the plurality of bits. The waveform information 75W, the bit position information 75P, and the first likelihood ratio information 75L correspond to the feature quantities in the plurality of computation nodes 71N.

[0032] The first signal S1 based on the reproduced signal Sig-r is input to the decoder 71. In the decoder 71, the first signal S1 based on the reproduced signal Sig-r is processed by using a plurality of calculation nodes 71N having a connection relationship based on the check matrix H. The processing result is output from the decoder 71 as the second signal S2. The second signal S2 includes a likelihood ratio group α2. The likelihood ratio group α2 includes, for example, likelihood ratios associated with each of a plurality of bits.

[0033] like Figure 1 As shown, the output of the error correction decoder 72 can be input to the decoder 71. The decoder 71 is configured to output the second signal S2 using the output of the error correction decoder 72. For example, iterations are performed. In one example, the number of iterations can correspond to the number of multiple intermediate layers included in the decoder 71.

[0034] In one example, the number of feature quantities of each of the plurality of computation nodes 71N is 7. The number of outputs of each of the plurality of computation nodes 71N is 1. In the decoder 71 , learning related to the following first equation can be performed.

[0035]

Form 1

[0036]

[0037] In Formula 1, "MLP" and "ε" are coefficients. A convolution operation is performed based on Formula 1. For example, a three-layer GIN (Graph Isomorphism Network) structure can be applied.

[0038] In one example, a fully coupled neural network is applied to the MLP in equation 1. The number of input nodes is 7. The number of output nodes is 1. The number of intermediate layer nodes is 15. The number of intermediate layers is 5.

[0039] In the embodiment, for example, machine learning based on local convolution operations is performed. During machine learning, the contribution of the error can be changed according to the number of connections in the multiple computing nodes 71N. For example, the number of connections of one computing node in the multiple computing nodes 71N is greater than the number of connections of another computing node in the multiple computing nodes 71N. In this case, during the learning of the decoder 71 (during machine learning), the contribution of the error related to one computing node in the multiple computing nodes 71N is greater than the contribution of the error related to another computing node in the multiple computing nodes 71N. Thus, more efficient learning can be achieved. A high-precision decoder 71 can be provided.

[0040] For example Figure 1As shown, for example, the number of connections of the third node N3 is greater than the number of connections of the first node N1. In this case, when the decoder 71 is learned, the contribution of the error related to the third node N3 is set to be greater than the contribution of the error related to the first node N1. The contribution corresponds to a coefficient related to the weight, for example.

[0041] Figure 2 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0042] like Figure 2 As shown in FIG. 1 , the magnetic reproduction processing device 111 according to the embodiment further includes a first maximum likelihood decoder 74 a. The configuration of the magnetic reproduction processing device 111 other than this may be the same as that of the magnetic reproduction processing device 110 .

[0043] In the magnetic reproduction processing device 111, a signal based on the reproduction signal Sig-r is input to the first maximum likelihood decoder 74a. The output of the first maximum likelihood decoder 74a is input to the decoder 71 as the first signal S1. In the magnetic reproduction processing device 111, errors are further suppressed. The first maximum likelihood decoder 74a may include, for example, a Viterbi decoder.

[0044] like Figure 2 As shown, the magnetic reproduction processing device 111 may further include a waveform equalizer 73. A signal based on the reproduction signal Sig-r is input to the waveform equalizer 73. The output of the waveform equalizer 73 may be input to the decoder 71. In this example, the output of the waveform equalizer 73 is input to the first maximum likelihood decoder 74a, and the output of the first maximum likelihood decoder 74a is input to the decoder 71.

[0045] Figure 3 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0046] like Figure 3 As shown, the magnetic reproduction processing device 112 according to the embodiment further includes a second maximum likelihood decoder 74b. The configuration of the magnetic reproduction processing device 112 other than this may be the same as that of the magnetic reproduction processing device 110 or the magnetic reproduction processing device 111.

[0047] In the magnetic reproduction processing device 112, the second signal S2 output from the decoder 71 is input to the second maximum likelihood decoder 74b. The output of the second maximum likelihood decoder 74b is input to the error correction decoder 72. In the magnetic reproduction processing device 112, errors are further suppressed. The second maximum likelihood decoder 74b may include, for example, a Viterbi decoder.

[0048] like Figure 3As shown, the magnetic reproduction processing device 112 may further include a waveform equalizer 73. A signal based on the reproduction signal Sig-r is input to the waveform equalizer 73. The output of the waveform equalizer 73 is input to the decoder 71.

[0049] Figure 4 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0050] like Figure 4 As shown, the magnetic reproduction processing device 120 according to the embodiment includes a decoder 71, an error correction decoder 72, and a storage unit 77M. The configuration of the magnetic reproduction processing device 120 may be the same as that of the magnetic reproduction processing device 110 except for the storage unit 77M.

[0051] In the magnetic reproduction processing device 120, the first signal S1 based on the reproduced signal Sig-r is input to the decoder 71. The second signal S2 output from the decoder 71 is input to the error correction decoder 72. The storage unit 77M includes a first storage area 77a.

[0052] The error correction decoder 72 is configured based on the check matrix H (see Figure 1 ) corrects the error of the second signal S2. The decoder 71 includes a neural network layer 71L (refer to Figure 1 ). The neural network layer 71L includes a plurality of computing nodes 71N (refer to Figure 1 ).

[0053] The first storage area 77a is configured to store information related to the connection relationship between the plurality of computing nodes 71N. The connection relationship is based on the check matrix H. The decoder 71 is configured to derive the second signal S2 by a calculation based on the first signal S1 and the connection relationship stored in the first storage area 77a. The second signal S2 includes, for example, a likelihood ratio group α2. In the magnetic reproduction processing device 120, errors are suppressed.

[0054] In the magnetic reproduction processing device 120, the reproduced signal Sig-r includes waveform information 75W, bit position information 75P, and first likelihood ratio information 75L (first likelihood ratio group α1) (see Figure 1 ). The waveform information 75W includes, for example, a first waveform of the first bit, a second waveform of the second bit before the first bit, and a third waveform of the third bit after the first bit. The bit position information 75P includes position information of the first bit.

[0055] like Figure 4 As shown, the storage unit 77M may further include a second storage area 77b. The second storage area 77b is configured to store information related to the check matrix H. The error correction decoder 72 performs error correction using the information related to the check matrix H stored in the second storage area 77b.

[0056] like Figure 4 As shown, the storage unit 77M may further include a third storage area 77c. The third storage area 77c is configured to store information related to weights in the decoder 71. For example, in the learning of the decoder 71, the information related to weights stored in the third storage area 77c is applied.

[0057] like Figure 4 As shown, in the magnetic reproduction processing device 120, the output of the error correction decoder 72 can be input to the decoder 71. The decoder 71 is configured to use the output of the error correction decoder 72 to output the second signal S2.

[0058] Figure 5 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0059] like Figure 5 As shown, the magnetic reproduction processing device 121 according to the embodiment further includes a first maximum likelihood decoder 74a. The configuration of the magnetic reproduction processing device 121 other than this may be the same as that of the magnetic reproduction processing device 120.

[0060] In the magnetic reproduction processing device 121, a signal based on the reproduction signal Sig-r is input to the first maximum likelihood decoder 74a. The output of the first maximum likelihood decoder 74a is input to the decoder 71 as the first signal S1. In the magnetic reproduction processing device 121, errors are further suppressed. The first maximum likelihood decoder 74a may include, for example, a Viterbi decoder.

[0061] like Figure 5 As shown, the magnetic reproduction processing device 121 may further include a waveform equalizer 73. A signal based on the reproduction signal Sig-r is input to the waveform equalizer 73. The output of the waveform equalizer 73 may be input to the decoder 71. In this example, the output of the waveform equalizer 73 is input to the first maximum likelihood decoder 74a, and the output of the first maximum likelihood decoder 74a is input to the decoder 71.

[0062] Figure 6 This is a schematic diagram illustrating a magnetic reproduction processing device according to the first embodiment.

[0063] like Figure 6 As shown, the magnetic reproduction processing device 122 according to the embodiment further includes a second maximum likelihood decoder 74b. The configuration of the magnetic reproduction processing device 122 other than this may be the same as that of the magnetic reproduction processing device 120 or the magnetic reproduction processing device 121.

[0064] In the magnetic reproduction processing device 122, the second signal S2 output from the decoder 71 is input to the second maximum likelihood decoder 74b. The output of the second maximum likelihood decoder 74b is input to the error correction decoder 72. In the magnetic reproduction processing device 122, errors are further suppressed. The second maximum likelihood decoder 74b may include, for example, a Viterbi decoder.

[0065] like Figure 6 As shown, the magnetic reproduction processing device 122 may further include a waveform equalizer 73. A signal based on the reproduction signal Sig-r is input to the waveform equalizer 73. The output of the waveform equalizer 73 is input to the decoder 71.

[0066] The magnetic reproduction processing device according to the embodiment may include a computer.

[0067] Figure 7 It is a schematic diagram of a magnetic reproduction processing device involved in an exemplary embodiment.

[0068] like Figure 7 As shown, the magnetic reproduction processing device (e.g., magnetic reproduction processing device 110) involved in the embodiment may include a processing circuit 76p, a storage circuit 76m, an interface circuit 76f, etc. The processing circuit 76p is, for example, an electrical circuit. The storage circuit 76m may also include, for example, at least one of a ROM (Read Only Memory) and a RAM (Random Access Memory). As the storage circuit 76m, for example, a part of the magnetic recording and reproducing unit 80D may also be used.

[0069] The magnetic reproduction processing device (e.g., magnetic reproduction processing device 110) involved in the embodiment may also include a display device 76d and an input device 76i. The display device 76d may include various displays. The input device 76i may include, for example, a device with an operation function (e.g., a keyboard, a mouse, a touch input panel, or a voice recognition input device).

[0070] The multiple elements included in the magnetic reproduction processing device (e.g., the magnetic reproduction processing device 110) involved in the embodiment can communicate with each other by at least any one of wireless and wired methods. The locations where the multiple elements included in the magnetic reproduction processing device 110 are set may also be different from each other. As the magnetic reproduction processing device 110, for example, a general-purpose computer may be used. As the magnetic reproduction processing device 110, for example, a plurality of computers connected to each other may be used. As at least a part of the magnetic reproduction processing device 110, a dedicated circuit may be used. As the magnetic reproduction processing device 110, for example, a plurality of circuits connected to each other may be used.

[0071] The embodiment may include a program. The program causes a computer (magnetic reproduction processing device 110) to execute the above-mentioned operation. The embodiment may include a storage medium storing the above-mentioned program.

[0072] A magnetic recording and reproducing device according to an embodiment (a magnetic recording and reproducing device 210, see Figure 1 ) includes any magnetic reproduction processing device involved in the first embodiment and its deformation.

[0073] (Second embodiment)

[0074] The second embodiment relates to a magnetic reproducing method. The magnetic reproducing method according to the embodiment is a method using the magnetic reproducing processing apparatus (for example, 110 to 112, 120 to 122) according to the first embodiment and its variations. A magnetic reproducing method capable of suppressing errors can be provided.

[0075] The implementation method may include the following technical solutions.

[0076] (Technical Solution 1)

[0077] A magnetic reproduction processing device, comprising:

[0078] decoder; and

[0079] Error correction decoder,

[0080] inputting a first signal based on the reproduced signal to the decoder,

[0081] inputting a signal based on a second signal outputted from the decoder into the error correction decoder,

[0082] The error correction decoder corrects errors of the second signal based on a check matrix.

[0083] The decoder comprises a neural network layer,

[0084] The neural network layer includes multiple computing nodes.

[0085] The connection relationship of the plurality of computing nodes is based on the check matrix.

[0086] (Technical Solution 2)

[0087] According to the magnetic reproduction processing device described in technical solution 1,

[0088] The reproduced signal includes waveform information, bit position information and first likelihood ratio information,

[0089] The waveform information includes a first waveform of a first bit, a second waveform of a second bit before the first bit, and a third waveform of a third bit after the first bit.

[0090] The bit position information includes the position information of the first bit.

[0091] (Technical Solution 3)

[0092] According to the magnetic reproduction processing device described in technical solution 1 or 2,

[0093] The output of the error correction decoder is input to the decoder,

[0094] The decoder is configured to output the second signal using the output of the error correction decoder.

[0095] (Technical Solution 4)

[0096] According to any one of the magnetic reproduction processing devices of technical solutions 1 to 3,

[0097] The magnetic reproduction processing device further comprises a first maximum likelihood decoder,

[0098] A signal based on the reproduced signal is input to the first maximum likelihood decoder.

[0099] The output of the first maximum likelihood decoder is input to the decoder as the first signal.

[0100] (Technical Solution 5)

[0101] According to the magnetic reproduction processing device described in technical solution 4,

[0102] The first maximum likelihood decoder includes a Viterbi decoder.

[0103] (Technical Solution 6)

[0104] According to any one of the technical solutions 1 to 4, the magnetic reproduction processing device

[0105] The magnetic reproduction processing device further comprises a second maximum likelihood decoder,

[0106] The second signal is input to the second maximum likelihood decoder.

[0107] The output of the second maximum likelihood decoder is input to the error correction decoder.

[0108] (Technical Solution 7)

[0109] According to the magnetic reproduction processing device described in technical solution 6,

[0110] The second maximum likelihood decoder includes a Viterbi decoder.

[0111] (Technical Solution 8)

[0112] According to any one of the technical solutions 1 to 7, the magnetic reproduction processing device

[0113] The magnetic reproduction processing device also includes a waveform equalizer,

[0114] inputting a signal based on the reproduced signal into the waveform equalizer,

[0115] The output of the waveform equalizer is input to the decoder.

[0116] (Technical Solution 9)

[0117] According to any one of the magnetic reproduction processing devices of technical solutions 1 to 8,

[0118] The second signal includes a likelihood ratio group.

[0119] (Technical Solution 10)

[0120] According to any one of the magnetic reproduction processing devices of technical solutions 1 to 9,

[0121] The number of connections of one of the plurality of computing nodes is greater than the number of connections of another computing node in the plurality of computing nodes,

[0122] During learning of the decoder, a contribution of an error associated with the one of the plurality of computing nodes is greater than a contribution of an error associated with the other of the plurality of computing nodes.

[0123] (Technical Solution 11)

[0124] A magnetic reproduction processing device, comprising:

[0125] Decoder;

[0126] an error correction decoder; and

[0127] a storage unit including a first storage area,

[0128] inputting a first signal based on the reproduced signal to the decoder,

[0129] inputting a signal based on a second signal outputted from the decoder into the error correction decoder,

[0130] The error correction decoder corrects errors of the second signal based on a check matrix.

[0131] The decoder comprises a neural network layer,

[0132] The neural network layer includes multiple computing nodes.

[0133] The first storage area is configured to store information related to the connection relationship between the plurality of computing nodes.

[0134] The connection relationship is based on the check matrix,

[0135] The decoder is configured to derive the second signal through a calculation based on the first signal and the connection relationship stored in the first storage area.

[0136] (Technical Solution 12)

[0137] According to the magnetic reproduction processing device described in technical solution 11,

[0138] The reproduced signal includes waveform information, bit position information and first likelihood ratio information,

[0139] The waveform information includes a first waveform of a first bit, a second waveform of a second bit before the first bit, and a third waveform of a third bit after the first bit.

[0140] The bit position information includes the position information of the first bit.

[0141] (Technical Solution 13)

[0142] According to the magnetic reproduction processing device described in technical solution 11 or 12,

[0143] The storage unit further includes a second storage area,

[0144] The second storage area is configured to store information related to the check matrix.

[0145] (Technical Solution 14)

[0146] According to the magnetic reproduction processing device described in any one of technical solutions 11 to 13,

[0147] The storage unit further includes a third storage area,

[0148] The third storage area is configured to store information related to weights in the decoder.

[0149] (Technical Solution 15)

[0150] According to any one of the magnetic reproduction processing devices of technical solutions 11 to 14,

[0151] The output of the error correction decoder is input to the decoder,

[0152] The decoder is configured to output the second signal using the output of the error correction decoder.

[0153] (Technical Solution 16)

[0154] According to any one of the magnetic reproduction processing devices of technical solutions 11 to 15,

[0155] The magnetic reproduction processing device further comprises a first maximum likelihood decoder,

[0156] A signal based on the reproduced signal is input to the first maximum likelihood decoder.

[0157] The output of the first maximum likelihood decoder is input to the decoder as the first signal.

[0158] (Technical Solution 17)

[0159] According to any one of the magnetic reproduction processing devices of technical solutions 11 to 16,

[0160] The magnetic reproduction processing device further comprises a second maximum likelihood decoder,

[0161] The second signal is input to the second maximum likelihood decoder.

[0162] The output of the second maximum likelihood decoder is input to the error correction decoder.

[0163] (Technical Solution 18)

[0164] According to any one of the magnetic reproduction processing devices of technical solutions 1 to 17,

[0165] The error correction decoder comprises an LDPC decoder, ie a low-density parity-check code decoder.

[0166] (Technical Solution 19)

[0167] A magnetic recording and reproducing device, comprising:

[0168] The magnetic reproduction processing device according to any one of technical solutions 1 to 18; and

[0169] A magnetic recording and reproducing unit is configured to output the reproduced signal.

[0170] (Technical Solution 20)

[0171] A magnetic reproduction method using the magnetic reproduction processing device described in any one of technical solutions 1 to 18.

[0172] According to the embodiments, it is possible to provide a magnetic reproduction processing device, a magnetic recording and reproduction device, and a magnetic reproduction method that can suppress errors.

[0173] The embodiments of the present invention have been described above with reference to examples. However, the present invention is not limited to these examples. For example, the specific configuration of the decoder, error correction decoder, storage unit and other elements included in the magnetic reproduction processing device is included in the scope of the present invention as long as those skilled in the art can implement the present invention in the same manner and obtain the same effect by appropriately selecting from the well-known range.

[0174] As long as the gist of the present invention is included, a solution obtained by combining any two or more elements of each example within a technically feasible range is also included in the scope of the present invention.

[0175] As long as they include the purpose of the present invention, all magnetic reproduction processing devices, magnetic recording reproduction devices and magnetic reproduction methods that are based on the magnetic reproduction processing device, magnetic recording reproduction device and magnetic reproduction method described above as embodiments of the present invention and can be implemented by appropriately making design changes by those skilled in the art also fall within the scope of the present invention.

[0176] Within the scope of the concept of the present invention, those skilled in the art can conceive of various changes and modifications, and those changes and modifications are considered to also fall within the scope of the present invention.

[0177] Several embodiments of the present invention have been described, but these embodiments are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the scope of the purpose of the invention. These embodiments and / or their variations are included in the scope and purpose of the invention, and are included in the invention described in the claims and the scope of their equivalents.

Claims

1. A magnetic reproduction processing device, comprising: decoder; and Error correction decoder, inputting a first signal based on the reproduced signal to the decoder, inputting a signal based on a second signal outputted from the decoder into the error correction decoder, The error correction decoder corrects errors of the second signal based on a check matrix. The decoder comprises a neural network layer, The neural network layer includes multiple computing nodes. The connection relationship of the plurality of computing nodes is based on the check matrix.

2. The magnetic reproduction processing device according to claim 1, The reproduced signal includes waveform information, bit position information and first likelihood ratio information, The waveform information includes a first waveform of a first bit, a second waveform of a second bit before the first bit, and a third waveform of a third bit after the first bit. The bit position information includes the position information of the first bit.

3. The magnetic reproduction processing device according to claim 1, The output of the error correction decoder is input to the decoder, The decoder is configured to output the second signal using the output of the error correction decoder.

4. A magnetic reproduction processing device, comprising: Decoder; an error correction decoder; and a storage unit including a first storage area, inputting a first signal based on the reproduced signal to the decoder, inputting a signal based on a second signal outputted from the decoder into the error correction decoder, The error correction decoder corrects errors of the second signal based on a check matrix. The decoder comprises a neural network layer, The neural network layer includes a plurality of computing nodes. The first storage area is configured to store information related to the connection relationship between the plurality of computing nodes. The connection relationship is based on the check matrix, The decoder is configured to derive the second signal through a calculation based on the first signal and the connection relationship stored in the first storage area.

5. The magnetic reproduction processing device according to claim 4, The reproduced signal includes waveform information, bit position information and first likelihood ratio information, The waveform information includes a first waveform of a first bit, a second waveform of a second bit before the first bit, and a third waveform of a third bit after the first bit. The bit position information includes the position information of the first bit.

6. The magnetic reproduction processing device according to claim 4, The storage unit further includes a second storage area, The second storage area is configured to store information related to the check matrix.

7. The magnetic reproduction processing device according to claim 4, The storage unit further includes a third storage area, The third storage area is configured to store information related to weights in the decoder.

8. The magnetic reproduction processing device according to claim 1, The error correction decoder comprises an LDPC decoder, ie a low-density parity-check code decoder.

9. A magnetic recording and reproducing device comprising: The magnetic reproduction processing device according to claim 1; and A magnetic recording and reproducing unit is configured to output the reproduced signal.

10. A magnetic reproduction method using the magnetic reproduction processing device according to claim 1.

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