Communications – electrical: acoustic wave systems and devices – Distance or direction finding – By combining or comparing signals
Reexamination Certificate
2008-01-15
2008-01-15
Lobo, Ian J. (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
By combining or comparing signals
C367S118000, C367S901000
Reexamination Certificate
active
07319640
ABSTRACT:
A method and apparatus is provided for suppressing noise which includes receiving a plurality of signals from an array of sensors and transforming each of these signals to the frequency domain. The transformed signals are beamformed so that noise sources can be identified by bearing and frequency range. A planewave-fit noise-suppression routine is then used to remove identified noise sources from the transformed signals and to provide a noise-suppressed transformed signal having signals from said identified noise sources suppressed.
REFERENCES:
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patent: 5481505 (1996-01-01), Donald et al.
patent: 5914912 (1999-06-01), Yang
patent: 6980486 (2005-12-01), Kneipfer et al.
Donald James B.
Nuttall Albert H.
Wilson James H.
Kasischke James M.
Lobo Ian J.
Nasser Jean-Paul A.
Stanley Michael P.
The United States of America represented by the Secretary of the
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