US 12,149,895 B2
Methods, apparatus and systems for biometric processes
William E. Sherwood, Salt Lake City, UT (US); Cedric Andrieu, Edinburgh (GB); Ghassan Maalouli, Mesa, AZ (US); and Khaled Lakhdhar, Salt Lake City, UT (US)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Jun. 24, 2022, as Appl. No. 17/848,802.
Claims priority of provisional application 63/274,566, filed on Nov. 2, 2021.
Claims priority of provisional application 63/232,681, filed on Aug. 13, 2021.
Prior Publication US 2023/0048401 A1, Feb. 16, 2023
Int. Cl. H04R 29/00 (2006.01)
CPC H04R 29/00 (2013.01) 23 Claims
OG exemplary drawing
 
1. A method in a biometric authentication system, comprising:
generating an acoustic stimulus for application to a user's ear;
receiving an audio signal representing a response of the user's ear canal to the acoustic stimulus;
adapting an ear canal response estimate of the user's ear canal to the acoustic stimulus to reduce an error between the audio signal and the ear canal response estimate;
calculating one or more quality metrics, the quality metrics comprising one or more of:
an ear canal response estimate quality metric comprising one or more energy characteristics of the ear canal response estimate;
an error quality metric derived from the error;
an audio response quality metric comprising one or more statistical characteristics of the audio signal;
determining a validity of the audio signal for use in a biometric process based on the quality metrics; and
aborting the adaptation of the ear canal response estimate based on the audio response quality metric.