US 11,758,334 B2
Acoustic activity detection
Tomas Pitak, Bratislava (SK); Igor Mucha, Bratislava (SK); Robert Dick, Ipswich, MA (US); and Michael Tuttle, Medford, MA (US)
Filed by INVENSENSE, INC., San Jose, CA (US)
Filed on Aug. 6, 2021, as Appl. No. 17/396,105.
Prior Publication US 2023/0050915 A1, Feb. 16, 2023
Int. Cl. H04R 19/04 (2006.01)
CPC H04R 19/04 (2013.01) [H04R 2201/003 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method comprising:
receiving an acoustic signal at a micro-electromechanical system (MEMS) microphone;
based on portions of the acoustic signal being determined to exceed a threshold signal level, generating output pulses; and
extracting information representative of a frequency of the acoustic signal based on respective spacing between rising edges of the output pulses.