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:
Sep. 01, 1992
Filed:
Sep. 01, 1989
J Howard Glover, Kirkland, WA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A fast median filter is disclosed for filtering high frequency noise from signals, such as, signals from a radio altimeter. The filter continuously provides the median of a predetermined number of points of the signal, which are received in an array, by successively comparing each data point in the array with each other data point in the array. A counter is either incremented or decremented depending on the result of each comparison. If the counter reaches a predetermined value at the end of the sequence of comparisons, the median is determined. A pointer keeps track of the oldest data point in the array. After the median is determined, a new data point is received into the array and written over the oldest data point. The median of the array is determined each time the array is updated with a new data point. When the pointer reaches the last position in the array, the pointer is reset to the first position and is subsequently increment in the same manner.