61results about "Digital signal error detection/correction" patented technology

According to one embodiment, a magnetic disk device includes a disk, a write head, a volatile buffer memory, a parity generation unit, a write processing unit, an error correction unit, a storage processing unit, and a conventional correction limit prediction unit. The parity generation unit generates first conventional parity, first potential parity, second conventional parity and second potential parity. The storage processing unit overwrites the second potential parity to a first recoding area if the first prediction information is normal information, and leaves the first potential parity in the first recording area and stores the second potential parity in a second recording area if the first prediction information is replaced with abnormal information.

Systems and methods for error detection in quantum computing systems are provided. In one example, the method includes obtaining a multi-dimensional quantum error detection map. The multi-dimensional quantum error detection map represents one or more quantum error detection measurements over a period of time. The method includes determining a partitioning scheme and a fusion scheme for the multi-dimensional quantum error detection map based at least in part on the decoding delay and the fusion delay. The method includes partitioning the multi-dimensional quantum error detection map into a plurality of blocks based at least in part on the partitioning scheme. The method includes decoding each of the plurality of blocks. The method includes fusing the plurality of blocks into a decoded detection map based at least in part on the fusion scheme. The method includes operating a quantum computing system based at least in part on the decoded detection map.

To provide a magnetic disk device capable of predicting whether error correction to a data track of a disk reaches a limit or not.SOLUTION: A magnetic disk device 1 includes a first disk having a first data track and a second data track, a first write head, a write processing unit, an error correction unit, a correction limit prediction unit 65, and a determination unit. During the write period, the correction limit prediction unit 65 calculates the excess amount OVR, calculates the metric value Mer by multiplying the excess amount OVR by the first weighting factor, updates the cumulative metric value ME, and generates the first prediction information. The determination unit determines whether to cause the write processing unit to continue the write processing on the second data track based on the first prediction information.SELECTED DRAWING: Figure 18

Provided in the present application are a magnetic recording medium, a positioning method, and a related device. The magnetic recording medium comprises a servo band and a positioning band, wherein the servo band is used for indicating longitudinal position information; and the positioning band is used for indicating physical position information, whch is used for indicating the real physical position of the longitudinal position information in the magnetic recording medium. In the magnetic recording medium, in addition to the existing servo band, a positioning band for indicating physical position information is additionally provided. The physical position information can indicate the real physical position of a certain point, and thus the position information of the magnetic recording medium at the logical level and the position information of the magnetic recording medium at the physical level are interconnected, facilitating physical-level processing on the magnetic recording medium by a user.

The technical scheme provides a data error correction and performance optimization method based on multiple optical disks, comprising the following steps: S1, generating a logical volume which is in a temporary data state before data recording and comprises a data block and a verification block; s2, converting the logical volume into a physical volume through a recombination algorithm, wherein the physical volume is a mirror image file which can be directly recorded to an optical disc; s3, respectively burning the physical volume to a plurality of corresponding optical disks, and synchronously mounting the optical disks through a plurality of CD drivers to realize concurrent read-write operation on the physical volume; and S4, when the data block in any optical disc is damaged, reversely calculating the position of the damaged data block in the logical volume through the recombination algorithm, calling undamaged data blocks and verification blocks corresponding to the damaged data block in other optical discs, and recovering the damaged data block based on an erasure code algorithm. According to the technical scheme, the reading performance of the large file can be optimized, and data protection can be provided.

Provided are a method, system, and computer program product in whichdata is encoded for a plurality of tracks of a tape of a tape drive, by using an error correction code (ECC) scheme that applies a single code with code word symbols that are at least 10 bits. The code word symbols are interleaved along and across parallel tracks of the tape in the tape drive.

The present disclosure relates to the technical field of computers, and discloses an audio testing method and device, electronic equipment and a storage medium. The method comprises obtaining first recording audio of each recording end and second recording audio of a playing end. The first recording audio and the second recording audio both comprise background audio played simultaneously, and the first recording audio further comprises test audio corresponding to the recording end one by one. Audio detection is performed on each first recording audio to obtain a starting time of the background audio in each first recording audio. Audio detection is performed on the second recording audio to obtain a starting time of the background audio in the second recording audio and a detection time of each test audio. Based on the starting time of the background audio in the second recording audio and the detection time of each test audio, and the starting time of the background audio in each first recording audio, a synchronous test result of the second recording audio is determined. The method objectively ensures the accuracy of the synchronous test result.

The present invention provides a magnetic disk device that can efficiently record parity and has excellent error correction capabilities for user data on the disk. [Solution] The magnetic disk device comprises a disk DK, a write head WHD, a volatile buffer memory 80, a parity generation unit, a write processing unit 62, an error correction unit 64, a storage processing unit 65, and a normal correction limit prediction unit 66. The parity generation unit generates a first normal parity and a first strong parity based on first user data, and generates a second normal parity and a second strong parity based on second user data. The storage processing unit 65 overwrites the first recording area of ​​the buffer memory with the second strong parity if the first prediction information is normal information, and if the first prediction information changes to abnormal information, it leaves the first strong parity in the first recording area and stores the second strong parity in the second recording area of ​​the buffer memory.

This invention provides a magnetic storage structure and a method for detecting interference based thereon. The magnetic storage structure includes a magnetic storage area, a non-magnetic storage area, and a verification circuit. The magnetic storage area comprises a main storage area and a monitoring storage area, with the monitoring storage area used to write initial monitoring data. The non-magnetic storage area includes a verification storage area, with the verification storage area used to write verification data. The verification circuit acquires the monitoring data currently stored in the monitoring storage area and uses the verification data to verify the monitoring data, thereby determining whether the initial monitoring data written to the monitoring storage area has been overwritten. Since the main storage area and the monitoring storage area, both being magnetic storage, have the same interference characteristics, the method infers whether the data stored in the main storage area has been overwritten by monitoring the data rewriting status of the monitoring storage area. This improves the accuracy of interference detection by detecting whether the data stored in the magnetic storage structure has been overwritten under harsh environments such as high temperature and high-intensity magnetic fields. The structure is simplified, and the cost is reduced.

According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium including a plurality of concentric recording tracks, a magnetic head including a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium, and a controller including an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump.

According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium including a plurality of concentric recording tracks, a magnetic head including a write element which writes data to the recording tracks, a heating element, and a sensor which detects a surface condition of the recording medium, and a controller including an inspection circuit which detects, based on an sensor output of the sensor, presence or absence of a bump on a surface of the recording medium, a height and a width of the bump, and a memory which records the detected height and width of the bump.

The application discloses a magnetic tape storage adaptive interleaving method and system based on dynamic error mode detection, relates to the technical field of magnetic tape interleaving, and comprises the following steps: continuously collecting error information in a magnetic tape reading and writing process and forming a structured report; judging the received structured report according to a preset rule, dynamically calculating new interleaving parameters, and outputting a decision package containing a new interleaving depth factor and a new available track list; checking whether the parameters in the received decision package are within a preset range, and if yes, sending an instruction to a magnetic tape drive through a bottom driver interface, setting new interleaving configuration for the magnetic tape, and obtaining a success status code returned by the magnetic tape drive; and the interleaving method significantly improves the reliability and error correction efficiency of the magnetic tape storage system in a complex error environment, reduces redundancy, and improves the effective utilization rate of storage space.

A turbo encoder intended for use in earth stations communicating through data networks where Successive Interference Cancellation ( S IC ) multiple access to Low Earth Orbit ( LEO ) satellites is employed. The disclosed turbo encoder constitutes an enhancement to code rate 1 / 8 of a known in the art code rate 1 / 6 turbo encoder that comprises two recursive convolutional encoders, an encoder a and an encoder b. The enhancement is achieved by adding two recursive convolutional encoder forward connection vectors to the code rate 1 / 6 turbo encoder as follows : adding forward connection vector G4 10111 to either encoder a or encoder b; and adding forward connection vector G2 10101 to encoder b.

The present invention provides a magnetic disk device that can improve the recording density of data on the disk and suppress the degradation of write performance. [Solution] During the first write period, if the determination unit 67 determines that the error correction of the first user data on the first data track has not exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the second management. If the determination unit 67 determines that the above error correction has exceeded the limit, it instructs the write processing unit 62 to continue the write process and the management unit 65 to perform the third management. During or after the first write period, the determination unit 67 instructs the management unit 65 to perform the process of saving the data belonging to the third group to a non-volatile recording medium.

Techniques are provided for an error resistant radiation hardened memory system based on spreading of data bits among multiple random access memories (RAMs). A memory system implementing the techniques according to an embodiment includes a first plurality of RAMs configured to store data bits written to the memory system, the data bits distributed over the first plurality of RAMs. The system also includes an error correction coding (ECC) circuit configured to generate ECC codes, each of the codes associated with a unique group of the data bits. The system further includes a second plurality of RAMs configured to store bits of the ECC codes such that the bits of each ECC code are distributed over the second plurality of RAMs. The system further includes a reporting circuit configured to report a single bit error correction or a double bit error detection, resulting from a read operation on the memory system.

To provide a magnetic disk device capable of suitably performing rewrite operations caused by ATI (Automatic Time Indicator). [Solution] The controller performs an addition to the value of a counter corresponding to a neighboring memory area of ​​one of the multiple memory areas in response to a write operation. The rewrite operation includes a seek operation, a stabilization operation that waits for the residual vibration of the magnetic head to decay, and rewriting all the data of the first memory area to the first memory area after the stabilization operation. The controller decrements the value of the counter corresponding to the first memory area among the multiple counters in response to the rewrite operation. The controller performs an addition to the value of the counter corresponding to the second memory area among the multiple counters in response to the rewrite operation. The stabilization operation includes an operation that determines whether the stabilization operation is complete based on whether a first condition is met. The first condition differs depending on the trigger for executing the retry operation.

According to one embodiment, during a first write period, an adjustment unit derives a first predicted excess amount and a predicted upper limit threshold value, and a correction limit prediction unit calculates a first cumulative predicted excess amount. The determination unit causes the write processing unit to continue the write processing if determining that the first cumulative predicted excess amount is smaller than or equal to the predicted upper limit threshold value, and causes the write processing unit to suspend the write processing if determining that the first cumulative predicted excess amount exceeds the predicted upper limit threshold value.

A method for decoding includes, in a decoder 20 of an error correction code (ECC), receiving, in a buffer 24, a codeword 50 of the ECC containing a plurality of symbols, the codeword being misaligned with one or both boundaries of the buffer. In the buffer, one or more bits that do not belong to the codeword are zeroed. One or more syndromes are computed for the codeword across both the codeword and the zeroed bits. Based on the calculated syndromes, locations of one or more erroneous symbols are identified in the codeword, and the erroneous symbols are corrected in the identified locations to restore an erroneous version of the codeword. The method further includes compensating for misalignment between the codeword and the buffer during calculation of the syndrome or during identification of the location of the erroneous symbol.

A method comprises receiving data. The method comprises determining redundancy data for the received data. The method comprises storing the received data and the redundancy data in one or more memory modules of a group of memory modules. The method comprises receiving a read data request. The method comprises reconstructing the requested data, based on an erase data operation preventing a read data operation on the one or more memory modules where the requested data is stored. A time delay to reconstruct the requested data is less than a time period where a memory module of the group of memory modules is in an erase state.

The invention provides an audio management method and system of a low-cost voice player and a medium, and relates to the technical field of data processing, the method comprises the following steps: when an instruction is deletion, matching and deleting a local corresponding audio file according to an index specified by the instruction; when the instruction is modification, executing a renaming operation on the audio file specified by the instruction; when the instruction is sorting, receiving a new playing sequence list; after the execution is completed, obtaining an updated audio file set; scanning the updated audio file set, and extracting a digital prefix of each audio file name as a point set; and calculating the point set, determining a geometric sequence relationship of the digital prefixes of the filenames, and reordering all the audio files according to the geometric sequence relationship to obtain an ordering result. According to the invention, the reliability and accuracy of the synchronous clock signal are improved.

The invention discloses a multi-dimensional optical disk data format design method, which comprises the following steps of: numbering N data layer positions of a multi-dimensional optical disk to obtain layer numbers; each data layer is divided into continuous BANDs from inside to outside, M is larger than or equal to 200, each BAND stores fixed-capacity user data, and 1-3 circles of blank areas are reserved between every two adjacent BANDs to serve as boundary identification bands; the width of the BAND is gradually increased according to a gradient of 0.1-0.7 mm from outside to inside along the radial direction, and the width of the BAND on the innermost side is adaptive to the field of view of the image sensor; dividing the storage structure of each BAND into a BAND head, a data segment and a BAND tail which are arranged in sequence; the BAND head comprises a position identification area and a file information area; the data segment comprises data frames, synchronization frames and error correction frames which are alternately arranged; the BAND tail comprises a filling area and a tail identification area; according to the method, the addressing efficiency, the data extraction accuracy, the storage efficiency and the cross-device compatibility can be remarkably improved, the method is adaptive to a TB-magnitude high-capacity multi-dimensional optical disk, and the requirement for archiving and storing big data is met.

To write a learned correction amount with high quality from the beginning of write start.SOLUTION: A magnetic disk device is provided with a magnetic disk in which positional information is written for each track, an assist unit for heating the magnetic disk, a magnetic head for reading and writing data to and from the magnetic disk, and a control unit for controlling the magnetic disk device, wherein the control unit causes the magnetic head to read the positional information written to the magnetic disk so as to learn the correction amount of a positional deviation occurring in synchronization with the rotation of the magnetic disk, and the control unit controls the magnetic disk device. A data pattern used for detecting a defective part of a magnetic disk is written by a magnetic head while heating a learning target part of the magnetic disk by supplying assist power to an assist unit, and a learned correction amount is written to the magnetic disk by the magnetic head while heating a write target part of the correction amount of the magnetic disk by supplying the assist power to the assist unit.SELECTED DRAWING: Figure 5

A controller calculates, based on a positional error signal, an evaluation amount of damage on data of an adjacent track caused by a write operation, and compares a first amount being the evaluation amount with a first threshold value corresponding to a correction limit of an error correction in units of tracks. The controller interrupts the write operation in response to determining that the first amount is greater than the first threshold value. The controller executes a read operation on the adjacent track, acquires a metric representing a signal quality of the data of the adjacent track read by the read operation, calculates the evaluation amount based on the metric, and compares a second amount being the evaluation amount with the first threshold value. The controller continues the write operation in response to determining that the second amount is smaller than a first threshold value.

Decoding circuit (1) comprising: an input (14) for receiving raw bit values ​​of a forward error correction (FEC) block; a low-density parity check (LDPC) decoder (3) coupled to the input (14), wherein the LDPC decoder (3) performs a failed decoding operation on the raw bit values ​​of the FEC block and outputs a failed decoding syndrome (13) and a failed decoding output block (12); a trap detection comparator (4) coupled to the LDPC decoder (3), wherein the trap detection comparator (4) determines whether the FEC block is a trapped block by the number of failing check nodes indicated by the syndrome (13). are compared with an error threshold, whereby the FEC block is determined to be a trapped block if the number of failing check nodes specified by the syndrome (13)is less than the error threshold; and a trap control (2) coupled to the input (14), the trap detection comparator (4), and the LDPC decoder (3), wherein, when the FEC block is determined to be a trapped block, the trap control (2) performs trapped-block decoding iterations using the LDPC decoder (3) until the decoding operation is successful or until a predetermined number of trapped-block decoding iterations have been performed, wherein at each trapped-block decoding iteration, the trap control (2) does the following: generate an updated log likelihood ratio (LLR) map using weak bit values ​​corresponding to each bit in the FEC block and stochastic probability values ​​corresponding to each bit in the FEC block; provide to the LDPC decoder (3),the updated LLR card and either the raw bit values ​​of the FEC block or a failed decode output block from a previous failed decode operation, and sending a signal to the LDPC decoder (3) to perform a decode operation, wherein in response to the signal, the LDPC decoder (3) uses the updated LLR card to perform a decode operation on the respective bits of the raw bit values ​​of the FEC block or the failed decode output block from the previous failed decode operation, wherein, if it is not determined that the FEC block is a trapped block, the decode circuit outputs an error signal at an output of the decode circuit, and if the decode operation is successful in generating a codeword, the decode circuit outputs the codeword.

Provided is a magnetic disk device capable of improving performance and data reliability. A magnetic disk device according to an embodiment includes: a disk having a first track; a head which has a heater and which writes data to and reads data from the disk; and a controller that divides the first track into a plurality of divided regions, and sets a plurality of refresh thresholds for executing rewrite processing for each of the plurality of divided regions in the first track. When it is determined that a first number of writes for data to an adjacent division region adjacent to a first division region in the radial direction of the disk among the plurality of division regions is greater than a first refresh threshold among the plurality of refresh thresholds corresponding to the first division region, processing for rewriting data is performed in the first track.

A magnetic tape defined with one or more data partitions and one or more parity partitions is obtained, wherein each of the data partitions is separated from each of the parity partitions correspondin

The invention provides a magnetic recording medium, a positioning method and related equipment, the magnetic recording medium comprises a servo belt and a positioning belt, the servo belt is used for indicating longitudinal position information, the positioning belt is used for indicating physical position information, and the physical position information is used for indicating a real physical position of the longitudinal position information on the magnetic recording medium. In the magnetic recording medium, in addition to the original servo band, a positioning band for indicating physical position information is additionally added. The physical position information can indicate the real physical position of a certain point, so that the position information of the magnetic recording medium on the logic level and the position information of the magnetic recording medium on the physical level are communicated, and a user can conveniently process the magnetic recording medium on the physical level.

To appropriately perform error correction.SOLUTION: According to one embodiment, in a disk device, a controller can perform error correction for each sector in units of tracks. The controller can predict that the number of error sectors of the second track reaches the correction limit number of sectors according to the track margin specified by the first management information and the off-track amount of the first track while writing data to the first track with the head. The first track is a track of the plurality of tracks. In the first management information, track identification information and a track margin are associated with each of the plurality of tracks. The second track is a track adjacent to the first track among the plurality of tracks. For each of the plurality of tracks, the controller updates the first management information according to the reference value of the bit error rate and the bit error rate of the information read from the track.SELECTED DRAWING: Figure 1

According to an embodiment, tracks on a magnetic disk each include a long-distance sector having a length in the circumferential direction covering two or more servo sectors. A controller executes an acquisition operation to acquire one or more evaluation amounts on the basis of a track pitch in each of the two or more servo sectors included in a portion adjacent to the long-distance sector. The controller executes a protection operation to protect data of an adjacent track in a case where a total value of the one or more evaluation amounts exceeds a first threshold value.