-
公开(公告)号：CA2155889C
公开(公告)日：2001-05-29
申请号：CA2155889
申请日：1995-08-11
Applicant: IBM
Inventor： OTTESEN HAL HJALMAR , SMITH GORDON JAMES , VANLEEUWEN GEORGE WILLARD
Abstract: A method and apparatus for effectuating the reception and local storage of source information signals representative of a media program transmitted from a source information network preferably over a cable television channel on a p ay-per- view basis is disclosed. A local intelligent set-top control unit communica tes with a remote information network and a local storage device to coordinate the tran smission of customer ordered media programs from the information network for storage on the local storage device. The local storage device is preferably a standard vi deo cassette recorder (VCR) providing full VCR control functionality when presen tinga stored media program on a television. A digital o r optical data storage disk drive system may alternatively be employed to store source information signals dow nloaded from the remote information network. The intelligent set-top control unit communicates a pay-per-view billing signal to the information network upon p laying of a downloaded media program, and provides protection against unauthorized copying. In an alternative configuration, a set-top control card is install ed into a host computer system to coordinate the reception and local storage of downlo adedmedia programs, and preferably provides a platform f or interfacing with other home communication and electronic systems.
-
公开(公告)号：DE69425096D1
公开(公告)日：2000-08-10
申请号：DE69425096
申请日：1994-07-28
Applicant: IBM
Inventor： CUNNINGHAM EARL ALBERT , OTTESEN HAL HJALMAR , ERICKSON KEVIN JACK
Abstract: Rotary actuator arc compensation correction method and apparatus are provided for a direct access storage device (DASD). A reference feedforward correction signal (64) is generated at each of a plurality of sectors around a predetermined track on a disk surface. A specific selected track is identified, and both magnitude and phase of the generated reference feedforward correction signal are modified to correct for the arced trajectory caused by the rotary actuator (58) at the specific selected track. Improved actuator servo control is provided by using pseudo sector compensation to interpolate the feedforward correction signal between servo sectors.
-
公开(公告)号：DE69325435T2
公开(公告)日：2000-01-20
申请号：DE69325435
申请日：1993-11-19
Applicant: IBM
Inventor： GOOD DANIEL LEE , MASON JEFFREY ERIC , OTTESEN HAL HJALMAR
Abstract: The fly height of read/write heads in multiple disk drives is dynamically adjusted to optimum fly height by a servo loop. The fly height is sensed in real time with a harmonic ratio fly height detector and compared to an optimum or reference fly height. The suspension system of each head is adjusted in accordance with the departure of the fly height of that head from the optimum fly height. The adjustment of the suspension system is accomplished by bonding a piezoelectric film to the flexible suspension arm carrying each head. The fly height is corrected for both radial and circumferential error as the head changes radial and circumferential position relative to the disk surface. The reference fly height, to which each head is moved by the servo loop, may be selectively changed in the fly height servo operation. This can be done to lift the heads away from the disk surface during track seek mode or disk drive sleep mode. The reference fly height can also be changed to lower the heads towards the disk surface during error recovery mode.
-
公开(公告)号：PL327579A1
公开(公告)日：1998-12-21
申请号：PL32757996
申请日：1996-12-13
Applicant: IBM
Inventor： SMITH GORDON J , OTTESEN HAL HJALMAR
IPC: G01N25/72 , G11B5/00 , G11B5/012 , G11B5/455 , G11B5/55 , G11B5/596 , G11B5/82 , G11B13/00 , G11B21/02 , G11B27/24 , G11B33/10 , G11B33/14 , G11B23/42
Abstract: The present invention is a method and apparatus for positioning a magnetoresistive (MR) head relative to a storage medium in a storage device. The storage medium is mounted in the storage device to allow relative movement between the MR head and the storage medium. The storage medium includes servo information provided to induce a thermal response in the MR head. A controller controls the relative movement between the MR head and the storage medium using the thermal response induced in the MR head.
-
公开(公告)号：SG49359A1
公开(公告)日：1998-05-18
申请号：SG1997000666
申请日：1997-03-06
Applicant: IBM
Inventor： OTTESEN HAL HJALMAR , SMITH GORDON J
Abstract: A memory device using at least one disk is disclosed the memory device uses a banded disk. The disk is optimally banded for use in a multiple frequency zoned disk storage device. The allocation of track locations into zones on the disk reduces the number of zone bit frequencies the storage device must handle when the disk is rotated at more than one discrete disk velocity.
-
Patent Agency Ranking
公开(公告)号：SG44990A1
公开(公告)日：1997-12-19
申请号：SG1996011339
申请日：1996-11-18
Applicant: IBM
Inventor： SMITH GORDON J , OTTESEN HAL HJALMAR
IPC: G11B5/39 , G11B5/012 , G11B5/02 , G11B5/596 , G11B19/04 , G11B20/10 , G11B20/22 , G11B5/58 , H03H17/00
Abstract: An apparatus and method for reading an information signal from a magnetic storage medium (24) using a magnetoresistive (MR) element (72), modifying the signal such that a thermal component of the signal representing a thermal response of the MR element (72) is degraded, and altering the modified signal to produce a restored thermal signal substantially representative of the thermal component of the signal read from the storage medium (24). The information signal induced in the MR element (72) is communicated from the MR element (72) to an arm electronics (AE) module (74) having a highpass filtering behavior. The AE module passes content of the information signal other than the thermal component content, thereby degrading the thermal component of the information signal. An inverse filter (76,88), implemented using an infinite impulse response (IIR) filter, receives the highpass filtered signal from the AE module (74) and produces a restored thermal signal substantially representative of the thermal component of the information signal. The inverse filter (76,88) has a response substantially inverse to that of the effective highpass filter of the AE module (74). A signal summing device (90) is coupled to the AE module (74) and the inverse filter (88) for receiving a restored thermal signal from the inverse filter (88) and a composite signal, including thermal and magnetic components, from the AE module (74) and substantially eliminates the thermal component of the composite signal, which otherwise distorts or modulates the composite signal.
-
公开(公告)号：SG42871A1
公开(公告)日：1997-10-17
申请号：SG1996000330
申请日：1994-12-06
Applicant: IBM
Inventor： BERG LOWELL JAMES , BOUTAGHOU ZINE-EDDINE , LARSON THOMAS SCOTT , MEYER DALLAS W , MOSBRUCKER JAY MICHAEL , NEUBAUER JERRY LEE , OTTESEN HAL HJALMAR
Abstract: A load/unload device to remove the slider from the proximity of the magnetic recording surface of a disk in a disk drive whenever the disk is to be stopped is disclosed. The load/unload device is a ramp-like wedge which extends generally radially from the center of the magnetic disk and to the magnetic recording surface of the magnetic disk. When the slider is moved toward the center of the disk by an actuator mechanism, the end of the load arm supporting the slider, referred to as a tang, will engage the inclined plane of the wedge and lift the slider from the surface of the magnetic disk as the slider is translated closer to the center of the disk. Once the slider has been removed from close proximity of the disk, the tang may engage a trough-like surface on the structure supporting the wedge and will effectively detent the position of the slider through the forces exerted on the tang by the load beam of the actuator. Thus the disk will be protected from undesirable and damaging impacts of the slider against the magnetic recording surface of the disk thereby prolonging disk utility.
-
公开(公告)号：CA2089788C
公开(公告)日：1996-10-08
申请号：CA2089788
申请日：1993-02-18
Applicant: IBM
Inventor： OTTESEN HAL HJALMAR , SHARMA ARUN , SRI-JAYANTHA MUTHUTHAMBY
Abstract: A method for predicting and avoiding data errors by predicting disk drive read-write inhibit requirements in response to at least two parameters including a head position error and velocity with respect to the track centerline. A write or read inhibit signal is generated in response to selected combinations of these parameters to minimize soft read errors arising from track misregistration and to avoid hard errors arising from overwriting data recorded in an adjacent track. The read and write inhibit strategy is described as a pair of linguistic control rules suitable for implementation in a Fuzzy Logic Controller.
-
公开(公告)号：DE69620141T2
公开(公告)日：2003-01-02
申请号：DE69620141
申请日：1996-12-02
Applicant: IBM
Inventor： SMITH GORDON J , OTTESEN HAL HJALMAR
Abstract: An apparatus and method for reading an information signal from a magnetic storage medium (24) using a magnetoresistive (MR) element (72), modifying the signal such that a thermal component of the signal representing a thermal response of the MR element (72) is degraded, and altering the modified signal to produce a restored thermal signal substantially representative of the thermal component of the signal read from the storage medium (24). The information signal induced in the MR element (72) is communicated from the MR element (72) to an arm electronics (AE) module (74) having a highpass filtering behavior. The AE module passes content of the information signal other than the thermal component content, thereby degrading the thermal component of the information signal. An inverse filter (76,88), implemented using an infinite impulse response (IIR) filter, receives the highpass filtered signal from the AE module (74) and produces a restored thermal signal substantially representative of the thermal component of the information signal. The inverse filter (76,88) has a response substantially inverse to that of the effective highpass filter of the AE module (74). A signal summing device (90) is coupled to the AE module (74) and the inverse filter (88) for receiving a restored thermal signal from the inverse filter (88) and a composite signal, including thermal and magnetic components, from the AE module (74) and substantially eliminates the thermal component of the composite signal, which otherwise distorts or modulates the composite signal.
-
20.发明专利
公开(公告)号：GB2344421B
公开(公告)日：2002-10-09
申请号：GB9927982
申请日：1999-11-29
Applicant: IBM
Inventor： OTTESEN HAL HJALMAR , SMITH GORDON JAMES
Abstract: A method and apparatus for identifying and filtering a resonance frequency of a support structure supporting a read/write head in proximity with a data storage medium involves obtaining a particular sample of a position error signal (PES) frequency transform, preferably using Goertzel's algorithm. The velocity of the data storage medium is varied, and the magnitude of a particular PES frequency transform sample is computed at each of the velocities. A resonance frequency of the support structure is calculated using the velocity associated with the particular sample having a maximum magnitude. The effects of one or more resonance frequencies associated with a read/write head suspension may be canceled in a position error signal using one or more programmable filters provided in each servo loop. A processor programs the filters using the calculated resonance frequencies and adjusts to compensate for the additional lag introduced into the respective servo loops by the selected programmable filters. A method and apparatus for identifying one or more resonance frequencies of one or more read/write head support structures according to the principles of the present invention may be implemented in a data storage system and, preferably, implemented in-situ a data storage system without resort to circuitry external to the data storage system.
-
-
-
-
-
-
-
-
-
Search Results
46
records
(took 0.018 seconds)
