1
yuan xing Lee
Shaohua Yang, Richard Leo Galbraith, Ksenija Lakovic, Yuan Xing Lee, Travis Oenning, Jongseung Park, Hideki Sawaguchi, Bruce A Wilson: Decoding techniques for correcting errors using soft information. Hitachi Global Stroage Technologies Netherlands, Steven J Cahill, May 25, 2010: US07725800 (34 worldwide citation)

Two levels of error correction decoding are performed using first and second level decoders. A composite code formed by combining an inner component code and an outer component code can be used to decode the data and correct any errors. Performing two level decoding using a composite code allows the ...


2
yuan xing Lee
Ivana Djurdjevic, Bruce Alexander Wilson, Mario Blaum, Richard Leo Galbraith, Ksenija Lakovic, Yuan Xing Lee, Zongwang Li, Travis Roger Oenning: Techniques for generating bit reliability information in a post-processor using an error correction constraint. Hitachi Global Storage Technologies Netherlands, Steven J Cahill, October 11, 2011: US08037394 (23 worldwide citation)

Techniques are provided that generate bit reliabilities for a detected sequence. A detector generates the detected sequence. According to one embodiment, a post-processor finds a first set of combinations of one or more error events in the detected sequence satisfying a complete set or a subset of e ...


3
yuan xing Lee
Shaohua Yang, Mario Blaum, Richard Leo Galbraith, Ksenija Lakovic, Yuan Xing Lee, Travis Oenning, Jongseung Park, Hideki Sawaguchi: Reduced complexity error correction encoding techniques. Hitachi Global Storage Technologies Netherlands, Steven J Cahill, September 15, 2009: US07590920 (16 worldwide citation)

An error correction encoder inserts redundant parity information into a data stream to improve system reliability. The encoder can generate the redundant parity information using a composite code. Dummy bits are inserted into the data stream in locations reserved for parity information generated by ...


4
yuan xing Lee
Yuan Xing Lee, Morishi Izumita: Permuting MTR code with ECC without need for second MTR code. Hitachi Global Storage Technologies Netherlands, Townsend and Townsend and Crew, Patrick Duncan, May 5, 2009: US07530003 (13 worldwide citation)

Embodiments of the present invention provide techniques for generating MTR codes with ECC without the use of a second MTR code, while still satisfying the specified constraint. In one embodiment, a system for processing data comprises a maximum transition run or timing-varying maximum transition run ...


5
yuan xing Lee
Yuan Xing Lee, Ismail Demirkan, Richard L Galbraith, Evangelos Eleftheriou, Roy D Cideciyan: Method and apparatus for data coding for high density recording channels exhibiting low frequency contents. Hitachi Global Storage Technologies Netherlands, David W Lynch, Chambliss Bahner & Stophel P C, January 16, 2007: US07164371 (8 worldwide citation)

A method and apparatus for data coding for high-density recording channels exhibiting low frequency contents is disclosed. Coding is used that satisfies both Running Digital Sum (RDS) and Maximum Transition Run (MTR) properties, which are desirable for achieving high-density recording for recording ...


6
yuan xing Lee
Sizhen Yang, Yuan Xing Lee, Shaohua Yang: Techniques for providing greater error protection to error-prone bits in codewords generated from irregular codes. Hitachi Global Storage Technologies Netherlands, Steven J Cahill, January 5, 2010: US07644336 (8 worldwide citation)

Greater error protection is provided to error-prone bits that are generated from irregular soft-decoded error correction codes. Error protection is increased to error-prone bits that of interest in a particular system (e.g., parity check bits). One or more extra bits are added to each codeword in th ...


7
yuan xing Lee
Yuan Xing Lee, Weining Zeng: Method, apparatus and program storage device for determining sector block sizes using existing controller signals. Hitachi Global Storage Technologies Netherlands, David W Lynch, Chambliss Bahner & Stophel, April 3, 2007: US07199954 (7 worldwide citation)

A method and apparatus for determining sector block sizes using existing controller signals has been disclosed. The invention detects a characteristic of a data channel gate signal indicating a length of data, determines the length of data based on the detection of the characteristic, and calculates ...


8
yuan xing Lee
Yuan Xing Lee, Richard Leo Galbraith, Travis Oenning, Weldon Hanson: Optimizing detector target polynomials in read/write channels to achieve best error rate performance in disk drives. Hitachi Global Storage Technologies Netherlands, Townsend and Townsend and Crew, Patrick Duncan, September 9, 2008: US07424074 (5 worldwide citation)

Embodiments of the invention provide techniques for optimizing the detector target polynomials in read/write channels to achieve the best error rate performance in recording devices. In one embodiment, a method of obtaining a detector target polynomial of a read/write channel to achieve best error r ...


9
yuan xing Lee
Ivana Djurdjevic, Richard Leo Galbraith, Bruce Alexander Wilson, Yuan Xing Lee, Travis Roger Oenning, Mario Blaum, Ksenija Lakovic, Zongwang Li: Techniques for generating bit reliability information in the post processor. Hitachi Global Storage Technologies Netherlands, Steven J Cahill, October 11, 2011: US08037393 (4 worldwide citation)

A detector generates a detected sequence, and a post processor generates probability values that indicate the likelihood of a plurality of error events in the detected sequence. The post processor partitions the values into first and second subsets. The post processor selects a first most likely val ...


10
yuan xing Lee
Yuan Xing Lee: Methods and systems for automatically characterizing non-linearities of a read-back signal of a recording system. Hitachi Global Storage Technologies Netherlands, December 2, 2008: US07460323 (4 worldwide citation)

A method for automatically characterizing non-linearities of a perpendicular read-back signal of a recording system is disclosed. The method includes using dibit extraction to obtain a read-back signal having a main pulse and a plurality of echoes where the read-back signal exhibits a baseline shift ...



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