US 9,810,925 B2
Noise cancelling microphone apparatus
Dashen Fan, Bellevue, WA (US)
Assigned to Kopin Corporation, Westborough, MA (US)
Filed by Kopin Corporation, Westborough, MA (US)
Filed on Feb. 14, 2014, as Appl. No. 14/181,059.
Claims priority of provisional application 61/780,108, filed on Mar. 13, 2013.
Claims priority of provisional application 61/839,211, filed on Jun. 25, 2013.
Claims priority of provisional application 61/839,227, filed on Jun. 25, 2013.
Claims priority of provisional application 61/912,844, filed on Dec. 6, 2013.
Prior Publication US 2014/0278385 A1, Sep. 18, 2014
Int. Cl. G10L 21/003 (2013.01); G10L 21/0208 (2013.01); G02C 11/00 (2006.01); H04R 1/02 (2006.01); H04R 3/00 (2006.01); G10K 11/00 (2006.01); G02C 11/06 (2006.01); G10L 21/0216 (2013.01)
CPC G02C 11/10 (2013.01) [G10K 11/002 (2013.01); H04R 1/028 (2013.01); H04R 3/005 (2013.01); G02C 11/06 (2013.01); G10L 21/0208 (2013.01); G10L 2021/02166 (2013.01); Y10T 29/49826 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A method of reducing noise, comprising the steps of:
a) forming a main signal and one or more reference signals at a beam-forming module based on at least two received audio signals from at least two microphone elements;
b) detecting voice activity at a voice activity detection module, the voice activity detection module receiving the main and reference signals and outputting a desired voice activity signal;
c) adaptively cancelling noise at an adaptive noise cancellation module, the adaptive noise cancellation module receiving the main, reference, and desired voice activity signals and outputting an adaptive noise cancelled signal; and
d) reducing noise at a single channel noise reduction module receiving the desired voice activity and adaptive noise cancelled signals and outputting a desired speech signal, wherein the beam-forming module, the adaptive noise cancellation module, and the single channel noise reduction module all employ only linear processing.