Patents by Inventor Nan Ling Goh

Nan Ling Goh 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).

  • Intelligent speed monitoring auto retract system
    Patent number: 6636374
    Abstract: A system for hardware intelligent speed monitoring and auto-retract is disclosed. The system contains a monitoring device that monitors the TACH (Tachometer) output of motor driver. The device provides a trigger to the signal processor and a retract mechanism to retract the actuator when the spindle motor speed is unexpectedly much higher or lower than normal speed. The system DSP (Digital Signal Processor) is unaware of such occurrence.
    Type: Grant
    Filed: April 19, 2000
    Date of Patent: October 21, 2003
    Assignee: Seagate Technology LLC
    Inventors: Ban Hok Goh, Nan Ling Goh, Tze Ming Jimmy Pang, Kah Liang Gan, LaiKein James Chang
  • Method and apparatus for correcting digital asymmetric read signals
    Patent number: 6519106
    Abstract: A method for compensating digital samples of an asymmetric read signal is presented. The method involves reading a digital sample of an asymmetric read signal V(t) (160), generating a compensated sample at least when the digital sample requires compensation (164), and outputting either the digital sample (168) or the compensated sample (166). Also presented is an asymmetry correction block (158) of a read channel (144) of a disc drive (110) that includes an input (200), a level detector (202), a compensator (204), and an output (208). The level detector (202) and the compensator (204) receive the digital sample through the input (200). The level detector (202) determines whether the digital sample requires compensation. The compensator (204) generates a compensated sample at least when the digital sample requires compensation. The output (208) selectively outputs either the digital sample or the compensated sample.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: February 11, 2003
    Assignee: Seagate Technology LLC
    Inventors: Nan Ling Goh, Ban Hok Goh, Utt Heng Kan, Kah Liang Gan
  • System and method for low acoustic noise spindle motor commutation
    Patent number: 6215266
    Abstract: A system for low acoustic noise spindle motor commutation is disclosed. The system contains a control device that generates commutation control signals which cause spindle motor drivers to source or sink current through windings of a spindle motor. The windings create electromagnetic fields which induce rotational movement in a spindle motor rotor. Low acoustic noise snubber devices are coupled to each winding and are dynamically configurable by the control device to provide low spindle motor driver charging current upon initial application of power to the spindle motor, and reduced acoustic noise and back EMF-generated current and voltage surges at the spindle motor driver during spindle motor commutation.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: April 10, 2001
    Assignee: Seagate Technology LLC
    Inventors: Nan Ling Goh, James Lai Kein Chang, Yam Pheng Tham, Utt Heng Kan, Kah Liang Gan