The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2009
Filed:
May. 18, 2004
Douglas B Kirkland, Mukilteo, WA (US);
Douglas B Kirkland, Mukilteo, WA (US);
The Boeing Company, Chicago, IL (US);
Abstract
A method is provided to reduce delay in signal processing of a digital control system. The method includes receiving outputs from a digital controller at a first frequency. A pre-load data value is then loaded into an accumulator register and output to a digital to analog converter (DAC). In one preferred embodiment, the pre-load data value is the value of the current digital controller output. In another preferred embodiment, the pre-load data value is the value of a previous digital controller output. The method additionally includes computing a step increment value that includes the difference between the most recent value output from the digital controller and the value output by the digital controller just prior to the most recent value. The step increment value is added to the pre-load data value in the accumulator register to create an augmented value, which is then output to the DAC. At a second frequency that is greater than the first frequency, the step increment value is periodically added to the augmented value to create subsequent augmented values. The subsequent augmented values are then output to the DAC until a subsequent value is received from a digital controller at the first frequency.