Method and apparatus for biometric authentication based on vibration signal

1. An operating method of an electronic device, comprising:

outputting a first vibration signal to a first touched object through a vibration module;

receiving a first response signal for the first vibration signal from the first touched object through the vibration module;

outputting a second vibration signal to a second touched object through the vibration module;

receiving a second response signal for the second vibration signal from the touched object through the vibration module; and

performing biometric authentication based on a ratio relationship between the first response signal and the second response signal.

2. The operating method of claim 1 , wherein the vibration module comprises:

a contact module configured to come into contact with at least one of the first touched object and the second touched object;

a vibration generation module configured to generate a vibration in the contact module and to output the vibration signal in response to the generated vibration; and

a response sensing module configured to measure the vibration generated in the contact module and to detect the response signal in response to the measured vibration.

3. The operating method of claim 2 , wherein in the contact module, a region in which the vibration is generated by the vibration generation module and a region which the vibration is measured by the response sensing module are identical.

4. The operating method of claim 1 , wherein the performing of the biometric authentication comprises:

calculating a frequency response function based on the vibration signal and the response signal; and

performing the biometric authentication on the object based on the frequency response function.

5. The operating method of claim 4 , wherein the calculating of the frequency response function comprises:

determining, as first response information, at least any one of a displacement, speed or acceleration for vibration pressure in a frequency region of the vibration signal;

detecting, as second response information, at least any one of the displacement, speed or acceleration for vibration pressure in the frequency region based on the response signal; and

calculating the frequency response function based on the first response information and the second response information.

6. The operating method of claim 4 , wherein the performing of the biometric authentication based on the frequency response function comprises:

pre-processing the frequency response function in order to remove, from the frequency response function, an effect attributable to a vibration component of the electronic device or the vibration module; and

performing the biometric authentication on the object based on the pre-processed frequency response function.

7. The operating method of claim 4 , wherein the performing of the biometric authentication based on the frequency response function comprises:

generating a frequency spectrum for the frequency response function; and

performing the biometric authentication on the object by comparing the frequency response function with a modeled frequency response function based on the frequency spectrum.

8. The operating method of claim 4 , wherein the performing of the biometric authentication based on the frequency response function comprises:

detecting biometric information based on the frequency response function; and

determining whether the biometric authentication is successful based on whether user information corresponding to the biometric information is detected, and

wherein the biometric information comprises a mass parameter, hardness parameter, and attenuation parameter of the frequency response function.

9. The operating method of claim 1 , wherein the performing of the biometric authentication comprises:

detecting time-series data of the response signal in a time region; and

performing the biometric authentication on the object based on at least one of a pattern or shape of the time-series data.

10. The operating method of claim 1 , wherein the performing of the biometric authentication comprises:

combining a plurality of response signals according to a sequence of time, and

performing biometric authentication on a combination of a plurality of objects according to a sequence of time.

11. An electronic device comprising:

a vibration module; and

a processor connected to the vibration module and configured to authenticate a user,

wherein the processor is configured to:

output a first vibration signal to a first touched object through the vibration module,

receive a first response signal for the first vibration signal from the first touched object through the vibration module,

output a second vibration signal to a second touched object through the vibration module,

receive a second response signal for the second vibration signal from the second touched object through the vibration module, and

perform biometric authentication based on a ratio relationship of the first response signal and the second response signal.

12. The electronic device of claim 11 , wherein the vibration module comprises:

a contact module configured to come into contact with the object;

a vibration generation module configured to generate a vibration in the contact module and to output the vibration signal in response to the generated vibration; and

a response sensing module configured to measure the vibration generated in the contact module and to detect the response signal in response to the measured vibration.

13. The electronic device of claim 12 , wherein in the contact module, a region in which the vibration is generated by the vibration generation module and a region which the vibration is measured by the response sensing module are identical.

14. The electronic device of claim 11 , wherein the processor is configured to:

calculate a frequency response function based on the vibration signal and the response signal; and

perform the biometric authentication on the object based on the frequency response function.

15. The electronic device of claim 14 , wherein the processor is configured to:

determine, as first response information, at least any one of a displacement, speed or acceleration for vibration pressure in a frequency region of the vibration signal;

detect, as second response information, at least any one of the displacement, speed or acceleration for vibration pressure in the frequency region based on the response signal; and

calculate the frequency response function based on the first response information and the second response information.

16. The electronic device of claim 14 , wherein the processor is configured to:

pre-process the frequency response function in order to remove, from the frequency response function, an effect attributable to a vibration component of the electronic device or the vibration module; and

perform the biometric authentication on the object based on the pre-processed frequency response function.

17. The electronic device of claim 14 , wherein the processor is configured to:

generate a frequency spectrum for the frequency response function; and

perform the biometric authentication on the object by comparing the frequency response function with a modeled frequency response function based on the frequency spectrum.

18. The electronic device of claim 14 , wherein the processor is configured to:

detect biometric information based on the frequency response function; and

determine whether the biometric authentication is successful based on whether user information corresponding to the biometric information is detected, and

wherein the biometric information comprises a mass parameter, hardness parameter, and attenuation parameter of the frequency response function.

19. The electronic device of claim 11 , wherein the processor is configured to:

detect time-series data of the response signal in a time region; and

perform the biometric authentication on the object based on at least one of a pattern or shape of the time-series data.

20. The electronic device of claim 11 , wherein the processor is configured to:

combine a plurality of response signals according to a sequence of time, and

perform biometric authentication on a combination of a plurality of objects according to a sequence of time.