Patents by Inventor Gary J. Asakawa

Gary J. Asakawa 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).

  • Patent number: 5825571
    Abstract: A circuit for input switching for a read channel is described. The present invention suppresses unwanted signals at the input of a read channel. The present invention uses an open impedance switching circuit to inhibit AC transients during DC bias restoration. One embodiment of the present invention uses a low impedance switching circuit to provide rapid restoration of DC bias levels. Coordination of the operation of the open impedance switching circuit and the low impedance switching circuit is provided to maximize suppression of unwanted signals.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: October 20, 1998
    Assignee: Texas Instruments Incorporated
    Inventors: Randall L. Sandusky, Gary J. Asakawa
  • Patent number: 5525928
    Abstract: A filter boost preattenuator provides controlled, rapid variable signal preattenuation at the input of a filter to optimally compensate for the absolute gain increase of the filter caused by increasing the high frequency boost level of the filter. The amplitude of the filter output exhibits very little change during boost variations that dynamically occur in applications such as data and servo signal recovery in disk drives. Using the present invention, disk space overhead needed to allow for readjustment of the automatic gain control system of a read/write channel is minimized. In the present invention, the feedforward signal provided from the variable gain boost circuit is applied to a feedback circuit and subtracted from the system input. The feedback forces a drop in the overall gain of the filter that increases with boost gain.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: June 11, 1996
    Assignee: Silicon Systems, Inc.
    Inventor: Gary J. Asakawa
  • Patent number: 5121260
    Abstract: A method of correcting read channel signal compensation in magnetic storage data storage systems with calibration data stored on select portions of the magnetic recording medium.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: June 9, 1992
    Assignee: Digital Equipment Corporation
    Inventors: Gary J. Asakawa, Robert Y. Noguchi, Joe Rinaldis