Patents by Inventor David D. Ratcliff

David D. Ratcliff 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).

  • Publication number: 20030021429
    Abstract: A high performance audio processing device having significantly increased reconfigurability capabilities and that offers far more precision and throughput than its predecessors without increasing the per-channel cost of the device above the per-channel cost of the predecessors. The device architecture includes a single-cycle, 48×28 bit multiply feature that is configured as a sophisticated switch to minimize the use of branching such that the reconfiguration capabilities of the device are significantly increased. Multiplying by zero shuts a path off, while multiplying by one turns the path on, and multiplying by −1 turns the path on, but with an inversion of the path signal's phase. The use of a full-precision multiply rather than other forms of decision logic also allows “morphing” from one setting to another on-the-fly, and provides new operating states that are linear combinations of the “on” and “off” settings.
    Type: Application
    Filed: July 30, 2001
    Publication date: January 30, 2003
    Inventors: David D. Ratcliff, Nicholas C. Kliewer, Rustin W. Allred
  • Patent number: 6267501
    Abstract: A method for measuring the temperature of a scene using a detector having at least one reference pixel, with an integratable sampling circuit associated with each pixel. Initially, an ambient reference temperature is observed with the reference pixel(s) to provide a parameter, generally voltage, indicative of that temperature to provide a constant voltage output indicating that temperature by varying the sampling circuit integration time. Each non-reference pixel is exposed to different scene and ambient temperatures and the integration time for each set of data for each pixel is recorded. For each pixel, an equation is provided relating integration time to pixel voltage when the ambient temperature and the scene temperature are the same to correct for offsets and an equation is provided relating integration time and offset corrected pixel value to the difference between the ambient temperature and the scene temperature when the ambient temperature and scene temperature differ for correction of responsivity.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: July 31, 2001
    Assignee: Raytheon Company
    Inventors: Martin A. Wand, Kenneth Rachels, John F. Brady, Michael Weinstein, David D. Ratcliff
  • Patent number: 5280889
    Abstract: "A vehicle and the ballistic shock isolator therefor including a turret, a sensor assembly and a shock isolator isolating the turret from the sensor switch and including upper and lower annular members, a plurality of leaves secured at opposing ends thereof to the annular members, each of the leaves having a corrugated bellows shaped portion in the form of an even number of similarly shaped portions, alternate ones of the similarly shaped portions having an open end in opposing directions, each of the leaves varying in thickness and width in a direction from the upper annular member to the lower annular member. The variation in width of the portion is alternately from wide to narrow and then from narrow to wide in a direction from the upper annular member to the lower annular member.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: January 25, 1994
    Assignee: Texas Instruments Incorporated
    Inventors: David L. Amil, William D. Bracken, Robert W. Coburn, Richard L. Knipe, Gregory G. Mooty, David D. Ratcliff, Daniel W. Stanley, Kenneth L. Taylor, Steven S. Stresau