Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
ADAPTABLE SPATIAL NOTCH FILTER
Document Type and Number:
WIPO Patent Application WO2004029634
Kind Code:
A3
Abstract:
A spatial notch filter is described that adapts in accordance with changes to an angular velocity of a rotating component within a manufacturing system. In a manufacturing system, noise may appear in feedback signals due to spatially distributed physical features in the system, such as imperfections in the components or sensors. This noise may be concentrated in a frequency band that changes as the angular velocity of rotating system components changes. The invention provides techniques for filtering this noise with one or more notch filters, and for adapting the center frequency of the notch filter as a function of angular velocity. The center frequency of the notch filter tracks the noise when the noise frequency changes.

More Like This:
JPS5526453DISPLAY UNIT FOR AVERAGE RUNNING SPEED AND SO ON
Inventors:
CARLSON DANIEL H
Application Number:
PCT/US2003/023901
Publication Date:
July 08, 2004
Filing Date:
July 31, 2003
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
G01P3/489; (IPC1-7): G01P3/48; G01P3/489; G05B19/19; H02P5/00
Foreign References:
EP0469617A11992-02-05
US6219196B12001-04-17
GB2266976A1993-11-17
US4924166A1990-05-08
US5889398A1999-03-30
US5559689A1996-09-24
EP1191310A22002-03-27
Other References:
PATENT ABSTRACTS OF JAPAN vol. 013, no. 445 (E - 829) 6 October 1989 (1989-10-06)
DATABASE WPI Section EI Week 198449, Derwent World Patents Index; Class V06, AN 1984-305607, XP002275615
PATENT ABSTRACTS OF JAPAN vol. 007, no. 150 (P - 207) 30 June 1983 (1983-06-30)
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 11 6 November 2002 (2002-11-06)
Download PDF:
View/Download PDF      PDF Help



 
Previous Patent: METHOD FOR IDENTIFYING BHS-SPECIFIC PROTEINS AND FRAGMENTS THEREOF

Next Patent: MOBILE FIXING PLATE