US 12,432,483 B2
Method and system for hybrid noise cancellation
Nitish K. Murthy, Allen, TX (US); and Edwin Randolph Cole, Dallas, TX (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Feb. 24, 2021, as Appl. No. 17/183,416.
Application 17/183,416 is a continuation of application No. 13/646,921, filed on Oct. 8, 2012, granted, now 10,966,014.
Claims priority of provisional application 61/544,864, filed on Oct. 7, 2011.
Prior Publication US 2021/0185428 A1, Jun. 17, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04R 1/10 (2006.01); G10K 11/178 (2006.01); H04R 3/02 (2006.01); H04R 5/033 (2006.01)
CPC H04R 1/1083 (2013.01) [G10K 11/17857 (2018.01); G10K 11/17881 (2018.01); G10K 11/17885 (2018.01); G10K 2210/1081 (2013.01); G10K 2210/3013 (2013.01); G10K 2210/3026 (2013.01); G10K 2210/3027 (2013.01); H04R 3/02 (2013.01); H04R 5/033 (2013.01); H04R 2410/05 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method performed by a combination of electronic circuitry components for active noise cancellation, the method comprising:
from a first microphone, receiving first analog microphone signals that represent first sound waves;
from a second microphone, receiving second analog microphone signals that represent second sound waves, wherein the second sound waves are buffered from the first sound waves by a mechanical structure between the first and second microphones;
converting the first analog microphone signals into first digital data and the second analog microphone signals into second digital data;
performing digital feedback processing on the first digital data and the second digital data to estimate first noise in the second sound waves;
generating noise cancelation information for canceling at least some of the estimated first noise;
combining the noise cancelation information and digital audio information from an audio source to generate combined digital information;
converting the combined digital information into third analog signals;
performing analog processing on the first analog microphone signals to estimate remaining noise that physical buffering of an earset fails to exclude from a space on a side of the earset;
generating fourth analog signals for canceling at least some of the estimated remaining noise by at least modifying the first analog microphone signals based on the estimated remaining noise;
combining the third and fourth analog signals into fifth analog signals; and
outputting the fifth analog signals to the earset.