Granted Patent
Utility
US 6,804,640 · App. 09/515,252
Signal noise reduction using magnitude-domain spectral subtraction
Inventors:
Mitchel Weintraub, Francoise Beaufays
Patented Case
View Patent ↗
Granted: Oct 12, 2004
Filed: Feb 29, 2000
Inventors
Mitchel Weintraub
Francoise Beaufays
Assignee (at issue)
Nuance Communications, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.