Patents by Inventor Hieu V. Nguyen
Hieu V. Nguyen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9935735Abstract: Presented is a data channel with selectable components, such as encoders or decoders. Also, data having different data signal characteristics can be processed through a data channel based on the data signal characteristics. Further, a data channel may have independent encoding path and an independent decoding path. For example, a first data transmission having first data signal characteristics may be processed via a data channel based on a first selected set of components of the data channel and a second data transmission having second data signal characteristics different than the first data signal characteristics may be processed via the data channel using a second selected set of components in the data channel. The first selected set of components may be different than the second selected set of components, but may share one or more common components.Type: GrantFiled: August 6, 2015Date of Patent: April 3, 2018Assignee: Seagate Technology LLCInventors: Ara Patapoutian, Hieu V. Nguyen, Prafulla Bollampalli Reddy
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Publication number: 20170041099Abstract: Presented is a data channel with selectable components, such as encoders or decoders. Also, data having different data signal characteristics can be processed through a data channel based on the data signal characteristics. Further, a data channel may have independent encoding path and an independent decoding path. For example, a first data transmission having first data signal characteristics may be processed via a data channel based on a first selected set of components of the data channel and a second data transmission having second data signal characteristics different than the first data signal characteristics may be processed via the data channel using a second selected set of components in the data channel. The first selected set of components may be different than the second selected set of components, but may share one or more common components.Type: ApplicationFiled: August 6, 2015Publication date: February 9, 2017Applicant: Seagate Technology LLCInventors: Ara Patapoutian, Hieu V. Nguyen
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Patent number: 9130596Abstract: Presented is a data channel with selectable components, such as encoders or decoders. Also, data having different data signal characteristics can be processed through a data channel based on the data signal characteristics. Further, a data channel may have independent encoding path and an independent decoding path. For example, a first data transmission having first data signal characteristics may be processed via a data channel based on a first selected set of components of the data channel and a second data transmission having second data signal characteristics different than the first data signal characteristics may be processed via the data channel using a second selected set of components in the data channel. The first selected set of components may be different than the second selected set of components, but may share one or more common components.Type: GrantFiled: June 29, 2011Date of Patent: September 8, 2015Assignee: Seagate Technology LLCInventors: Ara Patapoutian, Hieu V. Nguyen, Prafulla Bollampalli Reddy
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Patent number: 9019640Abstract: An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data sector cannot be decoded by a first decoder and storing the data sector for further processing by a second decoder.Type: GrantFiled: June 5, 2014Date of Patent: April 28, 2015Assignee: Seagate Technology LLCInventors: Prafulla Bollampalli Reddy, Hui Su, Michelle Elaine Blankenship, Eddie Wai Pun, John Marc Wright, Ara Patapoutian, Hieu V. Nguyen
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Publication number: 20140285916Abstract: An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data sector cannot be decoded by a first decoder and storing the data sector for further processing by a second decoder.Type: ApplicationFiled: June 5, 2014Publication date: September 25, 2014Inventors: Prafulla Bollampalli Reddy, Hui Su, Michelle Elaine Blankenship, Eddie Wai Pun, John Marc Wright, Ara Patapoutian, Hieu V. Nguyen
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Patent number: 8760986Abstract: An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data sector cannot be decoded by a first decoder and storing the data sector for further processing by a second decoder.Type: GrantFiled: February 29, 2012Date of Patent: June 24, 2014Assignee: Seagate Technology LLCInventors: Prafulla Bollampalli Reddy, Hui Su, Michelle Elaine Blankenship, Eddie Wai Pun, John Marc Wright, Ara Patapoutian, Hieu V Nguyen
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Publication number: 20130222939Abstract: An implementation of a system disclosed herein provides a method of deferring decoding of a data sector received at a read channel of a storage device, in response to determining that a data sector cannot be decoded by a first decoder and storing the data sector for further processing by a second decoder.Type: ApplicationFiled: February 29, 2012Publication date: August 29, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Prafulla Bollampalli Reddy, Hui Su, Michelle Elaine Blankenship, Eddie Wai Pun, John Marc Wright, Ara Patapoutian, Hieu V. Nguyen
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Publication number: 20130007556Abstract: Presented is a data channel with selectable components, such as encoders or decoders. Also, data having different data signal characteristics can be processed through a data channel based on the data signal characteristics. Further, a data channel may have independent encoding path and an independent decoding path. For example, a first data transmission having first data signal characteristics may be processed via a data channel based on a first selected set of components of the data channel and a second data transmission having second data signal characteristics different than the first data signal characteristics may be processed via the data channel using a second selected set of components in the data channel. The first selected set of components may be different than the second selected set of components, but may share one or more common components.Type: ApplicationFiled: June 29, 2011Publication date: January 3, 2013Applicant: SEAGATE TECHNOLOGY LLCInventors: Ara Patapoutian, Hieu V. Nguyen, Prafulla Bollampalli Reddy
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Patent number: 8079452Abstract: A carrying case includes a first compartment and a second compartment coupled to each other at attached ends by a hinge and detachably coupled to each other at free ends by at least one fastener. The at least one fastener includes a clip coupled to the first compartment and a cord coupled to the second compartment. The clip is configured to receive the cord to secure the free ends of the first compartment and the second compartment together.Type: GrantFiled: May 12, 2009Date of Patent: December 20, 2011Assignee: Target Brands, Inc.Inventors: Jason V. Drew, Hieu V. Nguyen
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Publication number: 20100288591Abstract: A carrying case includes a first compartment and a second compartment coupled to each other at attached ends by a hinge and detachably coupled to each other at free ends by at least one fastener. The at least one fastener includes a clip coupled to the first compartment and a cord coupled to the second compartment. The clip is configured to receive the cord to secure the free ends of the first compartment and the second compartment together.Type: ApplicationFiled: May 12, 2009Publication date: November 18, 2010Applicant: TARGET BRANDS, INC.Inventors: Jason V. Drew, Hieu V. Nguyen
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Publication number: 20090132894Abstract: A communications channel is provided that includes an encoder that receives user data and generates corresponding encoded symbols for transmission through a channel medium. A channel detector has an input coupled to receive an output signal from the channel medium and a reliability information output which produces reliability information regarding logic states of detected bits in the output signal. A binary reliability value is provide for each of the detected bits. The channel further includes a decoder having a reliability information input coupled to the reliability information output of the channel detector to generate corresponding user data words as a function of the binary reliability value.Type: ApplicationFiled: November 19, 2007Publication date: May 21, 2009Applicant: Seagate Technology LLCInventors: GuoFang Catherine Xu, Hieu V. Nguyen, William Michael Radich, Michael John Link
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Patent number: 6611397Abstract: Apparatus and method for improving operational performance of a disc drive by detecting defective servo burst patterns. A rotatable disc is provided with servo data which include a plurality of servo burst patterns to define a plurality of tracks. A head transduces the burst patterns to provide burst signals to a servo circuit which controllably positions the head with respect to the surface of the disc by determining a position error signal from a combination of the burst signals. The servo circuit identifies a selected servo burst pattern as defective in relation to differences between absolute values of successive pairs of peak amplitude samples from the burst signal.Type: GrantFiled: June 4, 1999Date of Patent: August 26, 2003Assignee: Seagate Technology LLCInventor: Hieu V. Nguyen
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Method of measuring the read-to-write offset in a disc drive having separate read and write elements
Patent number: 6483658Abstract: A method of measuring the read-to-write offset of a track in a disc drive system having separate read and write elements by measuring read error rate as a function of incremental actuator offset. The actuator is incrementally moved from one edge of the track to the other. The two radial positions which produce read error rates within acceptable limits are identified, and the read-to-write offset is determined by subtracting the offset at which the track was written, from the midpoint of the two radial positions. The read-to-write offset for each track accessed by the transducer is calculated from the read-to-write offset measured at the track.Type: GrantFiled: December 21, 1995Date of Patent: November 19, 2002Assignee: Seagate Technology LLCInventor: Hieu V. Nguyen -
Patent number: 6356404Abstract: Apparatus and method for simultaneously biasing multiple magneto-resistive read elements in a disc drive head/disc assembly. A preamplifier circuit sequentially applies read bias currents to successive pairs of heads of the head/disc assembly, wherein the read bias current applied to a selected one of each pair of the heads is used to transduce the servo data from the associated disc recording surface, and the read bias current applied to the remaining one of each pair of the heads is used to prepare the remaining one of each pair of the heads to subsequently transduce the servo data from the associated disc recording surface. The preamplifier circuit includes at least first and second read bias current sources and a head selection circuit.Type: GrantFiled: June 4, 1999Date of Patent: March 12, 2002Assignee: Seagate Technology LLCInventor: Hieu V. Nguyen
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Patent number: 6349009Abstract: Apparatus for improving data writing operations to a disc recording surface of a disc drive. A head assembly is supported over the disc recording surface by a flexible suspension assembly of a controllably positionable actuator assembly and includes a write current shaping circuit integrated with a write element. The write current shaping circuit modifies write currents received by the head assembly via a transmission line from a preamplifier driver circuit to remove undesired characteristics from the received write currents. The write element writes data to the disc recording surface using the write currents as modified by the write current shaping circuit.Type: GrantFiled: June 4, 1999Date of Patent: February 19, 2002Assignee: Seagate Technology LLCInventors: Housan Dakroub, Hieu V. Nguyen
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Patent number: 6342986Abstract: Apparatus and method for servo writing with simultaneous biasing of multiple magneto-resistive read elements in a disc drive head/disc assembly. A preamplifier circuit sequentially applies read bias currents to successive pairs of heads of the head/disc assembly, wherein the read bias current applied to a selected one of each pair of the heads is used to transduce the servo data from the associated disc recording surface, and the read bias current applied to the remaining one of each pair of the heads is used to prepare the remaining one of each pair of the heads to subsequently transduce the servo data from the associated disc recording surface. The preamplifier circuit includes at least first and second read bias current sources and a head selection circuit.Type: GrantFiled: December 8, 2000Date of Patent: January 29, 2002Assignee: Seagate Technology LLCInventor: Hieu V. Nguyen
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Patent number: 6266202Abstract: An apparatus and method for performing real-time, closed loop write verification in a disc drive having a rotatable magnetic disc and a head having read and write elements. During a write operation, the disc drive generates a write current signal indicative of input data to be written to the disc. The write current signal is applied to the write element, which generates a time-varying magnetic field to simultaneously induce a readback signal in the read element through magnetic coupling of the read element to the write element, and to magnetize the disc to write the input data to the disc. The readback signal induced in the read element is used to reconstruct a set of output data which is used to verify accuracy of the input data.Type: GrantFiled: June 4, 1999Date of Patent: July 24, 2001Assignee: Seagate Technology LLCInventors: Hieu V. Nguyen, Housan Dakroub
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Publication number: 20010000981Abstract: Apparatus and method for simultaneously biasing multiple magneto-resistive read elements in a disc drive head/disc assembly. A preamplifier circuit sequentially applies read bias currents to successive pairs of heads of the head/disc assembly, wherein the read bias current applied to a selected one of each pair of the heads is used to transduce the servo data from the associated disc recording surface, and the read bias current applied to the remaining one of each pair of the heads is used to prepare the remaining one of each pair of the heads to subsequently transduce the servo data from the associated disc recording surface. The preamplifier circuit includes at least first and second read bias current sources and a head selection circuit.Type: ApplicationFiled: December 8, 2000Publication date: May 10, 2001Applicant: Seagate Technology, Inc.Inventor: Hieu V. Nguyen
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Patent number: 5146372Abstract: Window center settings in a read channel of a magnetic disk drive are controlled. The magnetic disk drive is suitable for reading data from a magnetic disk. A number of read operations are performed and data is read from the magnetic disk. Read errors are detected during the read operations. The number of read errors is recorded and error types are determined. Adjustment of the window center settings is controlled based on the number of read errors detected and the error types determined.Type: GrantFiled: June 19, 1990Date of Patent: September 8, 1992Assignee: Seagate Technology, Inc.Inventors: Robert Cronch, Mark D. Hertz, Hieu V. Nguyen