Patents by Inventor Kok-Kia Chew
Kok-Kia Chew 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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Publication number: 20080152160Abstract: One aspect disclosed herein pertains to wireless audio transmission to a series of headset receivers in a daisy chain. Another aspect relates to a wireless headset with integrated audio outputs so that amplified audio may be made available to one or more persons without the use of head-phone or ear-bud listening devices. Another aspect pertains to a wireless headset with an integrated mini-loudspeaker for incoming cell phone calls. Another aspect relates to a wireless headset with both noise cancellation and external voice enhancement features. Yet another aspect relates to a wireless device configured to receive an audio or voice signal and to re-transmit the signal. Other aspects, features and embodiments are also disclosed herein.Type: ApplicationFiled: November 30, 2007Publication date: June 26, 2008Inventors: Kok-Kia Chew, Tianbing Gong, Hsu-Kuang Liou
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Patent number: 6762902Abstract: A method, apparatus, or product for a rotating disk storage device. In one embodiment, the apparatus includes a disk, a spindle motor that rotates the disk, a transducer, an actuator arm that can move the transducer, and a controller. The controller can control the movement of the actuator arm to move the transducer across the disk surface from a first track to a second track, and determine a position error signal (PES) at one or more positions between the first and second tracks, where the PES includes a non-repeatable disturbance signal. The controller can iteratively generate a disturbance correction signal at the one or more positions based on the PES, combine the disturbance correction signal with the PES to minimize the non-repeatable disturbance signal to provide a corrected PES, and vary, at the one or more positions, the movement of the transducer as a function of the corrected PES.Type: GrantFiled: October 9, 2001Date of Patent: July 13, 2004Assignee: Samsung Electronics Co., Ltd.Inventor: Kok-Kia Chew
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Patent number: 6700731Abstract: A method, apparatus, and computer program product for linearizing a position error signal of a transducer in a hard disk drive. In one embodiment, a disk including a first plurality of tracks each includes first and second servo bursts defining a track reference line, and a second plurality of the first plurality of tracks on the disk each includes third and fourth servo bursts defining a second plurality of different position offsets from the track reference line of the second plurality of tracks. Each of the second plurality of different position offsets being at a different value than any other position offset. The second plurality is no greater than the first plurality. The second plurality of different position offsets are used for linearizing a position error signal.Type: GrantFiled: May 31, 2001Date of Patent: March 2, 2004Assignee: Samsung Electronics Co., Inc.Inventor: Kok-Kia Chew
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Patent number: 6567233Abstract: There is a need for low-cost and reliable shock-sensing methods in magnetic hard-disk drives to maintain data integrity when a drive is subjected to external shocks. The present invention uses a novel shock-sensing method that is both reliable and low-cost, using a modified head preamplifier to detect servo fields from adjacent disk surfaces, as well as the disk surface being written or read. Servo fields on adjacent surfaces may be staggered. When a write head is writing data to a data field on a disk surface, a read head may be reading a servo field from an adjacent surface, insuring that the write head is on-track. By staggering the servo fields from surface to surface, shock may be sensed by measuring displacement of read heads on adjacent surfaces between servo sectors on the write surface. In addition, the use of a shock sensor or the like may be eliminated, reducing drive component cost.Type: GrantFiled: November 19, 1999Date of Patent: May 20, 2003Assignee: Cirrus Logic, Inc.Inventors: Kok-Kia Chew, Gerald Keith Lunn
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Publication number: 20030026036Abstract: A method, apparatus, and computer program product for linearizing a position error signal of a transducer in a hard disk drive. In one embodiment, a disk including a first plurality of tracks each includes first and second servo bursts defining a track reference line, and a second plurality of the first plurality of tracks on the disk each includes third and fourth servo bursts defining a second plurality of different position offsets from the track reference line of the second plurality of tracks. Each of the second plurality of different position offsets being at a different value than any other position offset. The second plurality is no greater than the first plurality. The second plurality of different position offsets are used for linearizing a position error signal.Type: ApplicationFiled: May 31, 2001Publication date: February 6, 2003Inventor: Kok-Kia Chew
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Publication number: 20020109934Abstract: A method, apparatus, or product for a rotating disk storage device. In one embodiment, the apparatus includes a disk, a spindle motor that rotates the disk, a transducer, an actuator arm that can move the transducer, and a controller. The controller can control the movement of the actuator arm to move the transducer across the disk surface from a first track to a second track, and determine a position error signal (PES) at one or more positions between the first and second tracks, where the PES includes a non-repeatable disturbance signal. The controller can iteratively generate a disturbance correction signal at the one or more positions based on the PES, combine the disturbance correction signal with the PES to minimize the non-repeatable disturbance signal to provide a corrected PES, and vary, at the one or more positions, the movement of the transducer as a function of the corrected PES.Type: ApplicationFiled: October 9, 2001Publication date: August 15, 2002Inventor: Kok-Kia Chew
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Patent number: 6393511Abstract: A multi-track density direct access storage device is disclosed. In accordance with a preferred embodiment of the present invention, a direct access storage device for data storage within a data processing system comprises a housing, a rotatable spindle, at least one disk, and several heads. The disk is fixedly mounted to the rotatable spindle, and the rotatable spindle is rotated by a motor within the housing. A first disk surface of the disk has a first track density and a second disk surface of the disk has a second track density; wherein the second track density is preferably greater than the first track density. Each of the several heads contains a transducer to read and write information from and to the disk during the disk rotation.Type: GrantFiled: February 9, 1999Date of Patent: May 21, 2002Assignee: International Business Machines CorporationInventors: David William Albrecht, Wayne Leung Cheung, Kok-Kia Chew, Ju-Hi Hong, John Jeffrey Stephenson
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Patent number: 5999351Abstract: A multi-track density direct access storage device is disclosed. In accordance with a preferred embodiment of the present invention, a direct access storage device for data storage within a data processing system comprises a housing, a rotatable spindle, at least one disk, and several heads. The disk is fixedly mounted to the rotatable spindle, and the rotatable spindle is rotated by a motor within the housing. A first disk surface of the disk has a first track density and a second disk surface of the disk has a second track density; wherein the second track density is preferably greater than the first track density. Each of the several heads contains a transducer to read and write information from and to the disk during the disk rotation.Type: GrantFiled: August 27, 1996Date of Patent: December 7, 1999Assignee: International Business Machines CorporationInventors: David William Albrecht, Wayne Leung Cheung, Kok-Kia Chew, Ju-Hi Hong, John Jeffrey Stephenson
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Patent number: 5717538Abstract: A servo system accurately detects and processes signals from servo patterns encoded on magnetic storage disks using weighted accumulation, for use in precisely positioning read/write heads with respect to tracks of data contained on the disks. After servo patterns are sensed by reading them from a disk, the resultant servo signals are processed by weighted accumulation circuitry to provide a position signal, which may be decoded to ascertain the positioning error of the read/write head and to apply any corrections that might be needed. In one embodiment, an amplitude position signal is generated by multiplying the servo signal by complementary quadrature weighting signals, then squaring each quadrature output signal, summing them, and taking the square root of the summed signal.Type: GrantFiled: January 20, 1995Date of Patent: February 10, 1998Assignee: International Business Machines CorporationInventors: Wayne Leung Cheung, Kok-Kia Chew, Ju-Hi John Hong
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Patent number: 5539592Abstract: A system for predicting the failure of a storage unit, such as a disk drive. In a most general sense, the inventive system includes a first mechanism (20, 22, 24) for moving an element (16) over a surface (12) which is moving relative to the element (16). The first mechanism includes an arm (18, 20) for supporting the element (16) over the surface (12) and a motor (24) connected to the arm (18, 20). A position error detector (42) is included for detecting a change in torque applied to the motor (24) due to friction between the element (16) and the surface (12). The position error detector (42) provides a signal in response to changes in torque which is processed to predict a head disk interaction or failure of the storage system. In a particular embodiment, the position error detector (42) senses a change in a lateral force applied to the element (12) in response to a change in friction between the surface and the element.Type: GrantFiled: October 5, 1994Date of Patent: July 23, 1996Assignee: International Business Machines CorporationInventors: Willard K. Banks, Kok-Kia Chew, Donald R. Gillis, Gordon J. Smith