# US 2014/0192434 A1 · Inter-track interference cancelation for shingled magnetic recording > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192434 A1 - Document ID: US20140192434A1 - Status: Published application - Kind: A1 - Application number: 14/158,468 - Filed: 2014-01-17 - Published: 2014-07-10 - Earliest claimed: 2010-10-29 - Assignees: SK hynix memory solutions inc. - Applicants: SK hynix memory solutions Inc. - Inventors: Jason Bellorado; Marcus Marrow - Web page: https://patentgrep.com/patent/US20140192434A1 ## CPC - G11B 20/10009: {Improvement or modification of read or write signals} - G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence) - G11B 5/09: Digital recording - G11B 20/10046: {filtering or equalising, e.g. setting the tap weights of an FIR filter} - G11B 2005/0002: {Special dispositions or recording techniques} - G11B 2020/1238: {track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located} - G11B 2020/1292: {Enhancement of the total storage capacity} - G11B 2020/1298: {Enhancement of the signal quality} - G11B 2220/2516: Hard disks - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract Inter-track interference cancelation is disclosed, including: receiving an input sequence of samples associated with a track on magnetic storage; using a processor to generate inter-track interference (ITI) data associated with a first side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the first side track. ## Claims ### Claim 1 A method, comprising: receiving an input sequence of samples associated with a track on magnetic storage; and using a processor to generate inter-track interference (ITI) data associated with a first side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the first side track. ### Claim 2 (depends on 1) The method of claim 1, further comprising removing the ITI data associated with the first side track from the input sequence of samples. ### Claim 3 (depends on 1) The method of claim 1, wherein generating ITI data includes generating a set of correlation coefficients and selecting a subset of the set of correlation coefficients. ### Claim 4 (depends on 3) The method of claim 3, wherein the selected subset of correlation coefficients is used to determine one or more of the following: (1) a relative phase offset between the track and the first side track or (2) a side track pulse-shape associated with the first side track. ### Claim 5 (depends on 3) The method of claim 3, wherein selecting a subset of the set of correlation coefficients is based at least in part on one or more of the following: a peak value associated with the set of correlation coefficients, a maximum power value associated with the set of correlation coefficients, or a maximum absolute sum value associated with the set of correlation coefficients. ### Claim 6 (depends on 1) The method of claim 1, further comprising determining whether a function associated with the set of correlation coefficients exceeds a set threshold, and in the event that the function exceeds the set threshold, removing the ITI data from the input sequence of samples and in the event that the function does not exceed the set threshold, not removing the ITI data from the input sequence of samples. ### Claim 7 (depends on 1) The method of claim 1, wherein generating ITI data associated with the first side track includes independently generating ITI data for each of two or more fragments associated with the first side track. ### Claim 8 (depends on 7) The method of claim 7, wherein each of the two or more fragments associated with the first side track are determined based on locations corresponding to a plurality of servo wedges. ### Claim 9 (depends on 7) The method of claim 7, further comprising removing ITI data generated for each of the two or more fragments from the input sample of sequences. ### Claim 10 (depends on 1) The method of claim 1, further comprising generating ITI data associated with a second side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the second side track. ### Claim 11 (depends on 10) The method of claim 10, further comprising removing the ITI data associated with the first side track and the ITI data associated with the second side track from the input sequence of samples. ### Claim 12 A system, comprising: a processor configured to: receive an input sequence of samples associated with a track on magnetic storage; and generate inter-track interference (ITI) data associated with a first side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the first side track; and a memory coupled with the processor and configured to provide the processor with instructions. ### Claim 13 (depends on 12) The system of claim 12, wherein the processor is further configured to remove the ITI data associated with the first side track from the input sequence of samples. ### Claim 14 (depends on 12) The system of claim 12, wherein to generate ITI data includes generating a set of correlation coefficients and selecting a subset of the set of correlation coefficients. ### Claim 15 (depends on 14) The system of claim 14, wherein the selected subset of correlation coefficients is used to determine one or more of the following: (1) a relative phase offset between the track and the first side track or (2) a side track pulse-shape associated with the first side track. ### Claim 16 (depends on 12) The system of claim 12, wherein the processor is further configured to determine whether a function associated with the set of correlation coefficients exceeds a set threshold, and in the event that the function exceeds the set threshold, to remove the ITI data from the input sequence of samples and in the event that the function does not exceed the set threshold, to not remove the ITI data from the input sequence of samples. ### Claim 17 (depends on 12) The system of claim 12, wherein to generate ITI data associated with the first side track includes independently generating ITI data for each of two or more fragments associated with the first side track. ### Claim 18 (depends on 17) The system of claim 17, wherein the processor is further configured to remove ITI data generated for each of the two or more fragments from the input sample of sequences. ### Claim 19 A computer program product, the computer program product being embodied in a non-transitory computer readable medium and comprising computer instructions for: receiving an input sequence of samples associated with a track on magnetic storage; and generating inter-track interference (ITI) data associated with a first side track including by performing a correlation between the input sequence of samples and a sequence of data associated with the first side track.