| US 7,565,288 B2 | ||
| Spatial noise suppression for a microphone array | ||
| Alejandro Acero, Bellevue, Wash. (US); Ivan J. Tashev, Kirkland, Wash. (US); and Michael L. Seltzer, Seattle, Wash. (US) | ||
| Assigned to Microsoft Corporation, Redmond, Wash. (US) | ||
| Filed on Dec. 22, 2005, as Appl. No. 11/316,002. | ||
| Prior Publication US 2007/0150268 A1, Jun. 28, 2007 | ||
| Int. Cl. G10L 21/02 (2006.01) | ||
| U.S. Cl. 704—226 [381/92] | 13 Claims |
| 1. A method of reducing noise, the method comprising:
obtaining a captured signal with a microphone array, wherein the captured signal comprises a desired signal and noise, wherein
the microphone array comprises at least three microphones, and wherein each microphone has a known position and a known directivity
pattern;
determining spatial information based on phase differences of non-repetitive pairs of signals from the at least three microphones,
wherein the spatial information is obtained from signals of at least two combinations of the at least three microphones, wherein
the spatial information comprises an at least two-dimensional space, and wherein each physical point from a real space has
a corresponding point in the at least two-dimensional space; and
computing an estimate of the desired signal based on an a priori spatial signal-to-noise ratio and an a posteriori spatial
signal-to-noise ratio, wherein the a priori spatial signal-to-noise ratio and the a posteriori spatial signal-to-noise ratio
are each based on the spatial information.
|