US 11,930,334 B2
Piezoelectric MEMS device with an adaptive threshold for detection of an acoustic stimulus
Robert J. Littrell, Boston, MA (US); Michael Carfore, North Quincy, MA (US); and Shuwan Xue, Quincy, MA (US)
Assigned to QUALCOMM Technologies, Inc., San Diego, CA (US)
Filed by Qualcomm Technologies Inc., San Diego, CA (US)
Filed on Aug. 15, 2022, as Appl. No. 17/819,855.
Application 17/819,855 is a continuation of application No. 16/819,665, filed on Mar. 16, 2020, granted, now 11,418,882.
Claims priority of provisional application 62/818,140, filed on Mar. 14, 2019.
Prior Publication US 2022/0394384 A1, Dec. 8, 2022
Int. Cl. H04R 3/00 (2006.01); G01R 19/02 (2006.01); H04R 3/06 (2006.01); H04R 17/02 (2006.01); H10N 30/30 (2023.01); H10N 30/80 (2023.01)
CPC H04R 3/06 (2013.01) [G01R 19/02 (2013.01); H04R 17/02 (2013.01); H10N 30/302 (2023.02); H10N 30/802 (2023.02); H04R 2201/003 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A device comprising:
a sensor; and
a circuit configured to detect when an input stimulus to the sensor satisfies an adaptive threshold, and further configured to produce a signal upon detection to cause adjustment to operation of the device,
wherein the circuit is further configured to adjust the adaptive threshold in accordance with detected changes to sound over a specified amount of time in an environment in which the device is located; and
wherein the device is further configured to output data representing one or more sound levels prior to detection of the input stimulus that satisfies the adaptive threshold.