EP 0316402 A4 19890919 - A FAST MEDIAN FILTER.
Title (en)
A FAST MEDIAN FILTER.
Title (de)
SCHNELLER MEDIANFILTER.
Title (fr)
FILTRE MEDIAN RAPIDE.
Publication
Application
Priority
US 5387387 A 19870526
Abstract (en)
[origin: WO8809537A1] A fast median filter (22) is disclosed for filtering high frequency noise from signals, such as, signals (10, 14) from a radio altimeter. The filter (22) continuously provides the median of a predetermined number of points of the signal, which are received in an array, by successively comparing (60) each data point in the array with each other data point in the array. A counter is either incremented (62) or decremented (64) 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 (30) keeps track of the oldest data point in the array (42). After the median is determined, a new data point is received into the array and written over the oldest data point (34). The median of the array is determined each time the array is updated with a new data point (32). When the pointer reaches the last position in the array, the pointer is reset to the first position and is subsequently incremented in the same manner (40).
IPC 1-7
IPC 8 full level
G01S 7/02 (2006.01); G01S 13/32 (2006.01); G06F 7/02 (2006.01); H03H 17/02 (2006.01); H03H 21/00 (2006.01)
CPC (source: EP)
H03H 17/0263 (2013.01)
Citation (search report)
- No further relevant documents have been disclosed.
- See references of WO 8809537A1
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
WO 8809537 A1 19881201; EP 0316402 A1 19890524; EP 0316402 A4 19890919; JP H01503341 A 19891109
DOCDB simple family (application)
US 8801224 W 19880418; EP 88904785 A 19880418; JP 50423888 A 19880418