Information processing device, wearable device, information processing method, and storage medium

1. An information processing device comprising:

a memory configured to store instructions; and

a processor configured to execute the instructions to:

acquire a first acoustic information obtained by receiving an echo sound, the echo sound being a sound wave emitted from a first sound source and echoed back in an ear canal of a user, by a wearable device worn by the user;

acquire a second acoustic information obtained by receiving a sound wave emitted from a second sound source that is different from the first sound source by the wearable device;

acquire a third acoustic information used for biometric matching of the user based on the first acoustic information and the second acoustic information; and

determine whether the user is a registrant or not based on the third acoustic information and at least one selected from a group of the first acoustic information and the second acoustic information.

2. The information processing device according to claim 1 , wherein the first acoustic information includes a transmission characteristic of an ear canal of the user.

3. The information processing device according to claim 1 , wherein the first sound source is a speaker provided in the wearable device.

4. The information processing device according to claim 1 , wherein the wearable device is an earphone worn on an ear of the user.

5. The information processing device according to claim 1 , wherein the second acoustic information includes a transmission characteristic of a voice emitted by the user.

6. The information processing device according to claim 1 , wherein the second sound source is a sound emitting organ of the user.

7. The information processing device according to claim 1 ,

wherein the first sound source is a speaker provided in the wearable device worn on an ear of the user, and

wherein a second sound source is a speaker provided in the wearable device or another wearable device worn on the other ear of the user.

8. The information processing device according to claim 1 , wherein the third acoustic information is generated and acquired by subtracting or dividing one of the first acoustic information and the second acoustic information from the other.

9. The information processing device according to claim 1 , wherein a frequency band of the first acoustic information and a frequency band of the second acoustic information at least partially overlap.

10. The information processing device according to claim 1 , wherein the processor is further configured to execute the instructions to determine whether the user is a registrant or not based on the third acoustic information.

11. The information processing device according to claim 1 ,

wherein the wearable device includes a first microphone and a second microphone arranged at different positions each other, and

wherein an acoustic information in which at least a part of an environmental sound is canceled based on a sound wave received by the first microphone and a sound wave received by the second microphone is acquired.

12. A wearable device comprising:

a memory configured to store instructions; and

a processor configured to execute the instructions to:

acquire a first acoustic information obtained by receiving an echo sound, the echo sound being a sound wave emitted from a first sound source and echoed back in an ear canal of a user, by the wearable device worn by the user;

acquire a second acoustic information obtained by receiving a sound wave emitted from a second sound source that is different from the first sound source by the wearable device;

acquire a third acoustic information used for biometric matching of the user based on the first acoustic information and the second acoustic information; and

determine whether the user is a registrant or not based on the third acoustic information and at least one selected from a group of the first acoustic information and the second acoustic information.

13. An information processing method comprising:

acquiring a first acoustic information obtained by receiving an echo sound, the echo sound being a sound wave emitted from a first sound source and echoed back in an ear canal of a user, by the wearable device worn by the user;

acquiring a second acoustic information obtained by receiving a sound wave emitted from a second sound source that is different from the first sound source by the wearable device;

acquiring a third acoustic information used for biometric matching of the user based on the first acoustic information and the second acoustic information; and

determining whether the user is a registrant or not based on the third acoustic information and at least one selected from a group of the first acoustic information and the second acoustic information.

14. A non-transitory storage medium storing a program that causes a computer to perform:

acquiring a first acoustic information obtained by receiving an echo sound, the echo sound being a sound wave emitted from a first sound source and echoed back in an ear canal of a user, by the wearable device worn by the user;

acquiring a second acoustic information obtained by receiving a sound wave emitted from a second sound source that is different from the first sound source by the wearable device;

acquiring a third acoustic information used for biometric matching of the user based on the first acoustic information and the second acoustic information; and

determining whether the user is a registrant or not based on the third acoustic information and at least one selected from a group of the first acoustic information and the second acoustic information.