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:

generate an inspection signal for emitting an inspection sound toward an ear canal of a subject, wherein the inspection sound is an ultrasonic wave having higher frequency than an audible range;

acquire a first acoustic information including information about an echo sound of the inspection sound, wherein the first acoustic information includes an information about a vibration of an eardrum of the subject; and

acquire a heartbeat information about a heartbeat of the subject based on the first acoustic information.

2. The information processing device according to claim 1 , wherein the heartbeat information is acquired based on an echo time between emitting the inspection sound and acquiring the echo sound.

3. The information processing device according to claim 2 , wherein the heartbeat information is acquired based on the echo time or a time variation of a distance calculated from the echo time.

4. The information processing device according to claim 2 ,

wherein a waveform of the inspection sound includes a modulation portion in which at least one of amplitude, frequency and phase is modulated, and

wherein the echo time is acquired based on a time difference of the modulation portion included in the inspection sound and the echo sound.

5. The information processing device according to claim 2 ,

wherein the inspection sound has a chirp wave in which frequency varies with time, and

wherein the echo time is acquired based on a result of a correlation calculation of the inspection sound and the echo sound.

6. The information processing device according to claim 1 ,

wherein the processor is further configured to execute the instructions to acquire a second acoustic information including information of a signal having lower frequency than frequency of the inspection sound,

wherein the heartbeat information is acquired based on the first acoustic information and the second acoustic information.

7. The information processing device according to claim 6 , wherein the second acoustic information includes information about a vibration of a position other than the ear canal of the subject.

8. The information processing device according to claim 6 , wherein the heartbeat information is acquired based on a result of a correlation calculation of the first acoustic information and the second acoustic information.

9. An information processing method comprising:

generating an inspection signal for emitting an inspection sound toward an ear canal of a subject, wherein the inspection sound is an ultrasonic wave having higher frequency than an audible range;

acquiring a first acoustic information including information about an echo sound of the inspection sound, wherein the first acoustic information includes an information about a vibration of an eardrum of the subject; and

acquiring a heartbeat information about a heartbeat of the subject based on the first acoustic information.

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

generating an inspection signal for emitting an inspection sound toward an ear canal of a subject, wherein the inspection sound is an ultrasonic wave having higher frequency than an audible range;

acquiring a first acoustic information including information about an echo sound of the inspection sound, wherein the first acoustic information includes an information about a vibration of an eardrum of the subject; and

acquiring a heartbeat information about a heartbeat of the subject based on the first acoustic information.