US 11,900,730 B2
Biometric identification
John P. Lesso, Edinburgh (GB); and Jason P. Rhode, Austin, TX (US)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Oct. 8, 2020, as Appl. No. 17/066,137.
Claims priority of provisional application 62/949,619, filed on Dec. 18, 2019.
Prior Publication US 2021/0192244 A1, Jun. 24, 2021
Int. Cl. G06V 40/50 (2022.01); G06F 17/18 (2006.01); G10L 15/02 (2006.01); H04R 1/10 (2006.01)
CPC G06V 40/50 (2022.01) [G06F 17/18 (2013.01); G10L 15/02 (2013.01); H04R 1/1016 (2013.01); H04R 1/1075 (2013.01); G10L 2015/025 (2013.01); H04R 2460/13 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method of biometric identification of a person comprising, during an enrolment phase:
determining at least one enrolment transfer function for bone conduction of an audio signal through an enrolling user's head; and
storing the at least one enrolment transfer function, and
during a verification phase:
determining at least one verification transfer function for bone conduction of an audio signal through the person's head; and
determining from the at least one verification transfer function and the at least one enrolment transfer function whether the person is the enrolling user;
wherein, in the enrolment phase and/or in the verification phase, the step of determining at least one enrolment transfer function or at least one verification transfer function for bone conduction of an audio signal through a person's head comprises, while the person is speaking and while the person is wearing an earpiece comprising a first transducer located on an outward facing part of the earpiece and a second transducer located on a part of the earpiece facing into the person's ear canal:
determining a plurality of times when the speech contains a specific acoustic class;
generating the first transducer output signal from the first microphone;
generating the second transducer output signal from the second microphone; and
determining the at least one enrolment transfer function or the at least one verification transfer function for said specific acoustic class based on the relationship between the first transducer output signal and the second transducer output signal at said plurality of times.