Personal authentication device, personal authentication method, and personal authentication program using acoustic signal propagation
地域：
Tokyo
摘要
A personal authentication device includes: acoustic signal transmission means 701 for transmitting a first acoustic signal to a part of a head of a user; acoustic signal observation means 702 for observing a second acoustic signal which is an acoustic signal after the first acoustic signal propagates through the part of the head; acoustic property calculation means 703 for calculating an acoustic property from the first acoustic signal and the second acoustic signal; and user identification means 704 for identifying the user, based on the acoustic property or a feature value extracted from the acoustic property and relating to the user.
說明書
This application is a National Stage of International Application No. PCT/JP2016/080833, filed Oct. 18, 2016, claiming priority based on Japanese Patent Application No. 2015-206857, filed Oct. 21, 2015, the contents of all of which are incorporated herein by reference in their entirety.
The present invention relates to a personal authentication device, a personal authentication method, and a personal authentication program for authenticating a person.
Personal authentication based on biological individual differences (biometrics-based authentication) has low risk of leakage or theft, as compared with passwords and the like. Accordingly, personal authentication based on biological individual differences has been increasingly introduced for the purpose of specifying persons and verifying their rights and for the purpose of security protection. Conventionally known personal authentication technologies based on biological individual differences use fingerprint, vein, face, iris, voice, and the like, as biometric information. Of these, personal authentication using voice can be performed with not a special device but an inexpensive general-purpose device such as a telephone or a microphone.
Patent Literature (PTL) 1 discloses, as an example of personal authentication using voice, a method of converting voice data to be authenticated into a feature value, measuring its similarity to a preregistered user's feature value, and performing authentication based on the result.
權(quán)利要求
The invention claimed is:1. A personal authentication device comprising:an acoustic signal transmission unit which transmits a first acoustic signal to a part of a head of a user; an acoustic signal observation unit which observes a second acoustic signal which is an acoustic signal after the first acoustic signal propagates through the part of the head; an acoustic property calculation unit implemented at least by a hardware including a processor and which calculates an acoustic property from the first acoustic signal and the second acoustic signal; and a user identification unit implemented at least by the hardware and which identifies the user, based on the acoustic property or a feature value extracted from the acoustic property and relating to the user, wherein the acoustic signal transmission unit is further configured to transmit a transmission acoustic signal used for removing ambient noise and/or a device property not dependent on the positional difference in the head to a right ear canal and a left ear canal of the user simultaneously, or pinnae of the user, the device further comprising a removal unit implemented at least by the hardware and which removes the ambient noise and/or the device property from the second acoustic signal, by performing a calculation using at least two acoustic signals, based on the transmission acoustic signal, observed at two locations of the head. 2. The personal authentication device according to claim 1 , comprisinga storage unit which stores beforehand, for at least one person, an acoustic property at a time of propagation of an acoustic signal through a predetermined part of a head of the person or a feature value extracted from the acoustic property, wherein the user identification unit identifies the user, by comparing the acoustic property calculated from the second acoustic signal with the acoustic property stored in the storage unit or comparing the feature value extracted from the acoustic property calculated from the second acoustic signal with the feature value stored in the storage unit. 3. The personal authentication device according to claim 1 , wherein the acoustic signal transmission unit is realized by an earphone, a headphone, or a receiver portion of a telephone, andwherein the acoustic signal observation unit is realized by a microphone mounted on the earphone, the headphone, or the receiver portion of the telephone. 4. The personal authentication device according to claim 1 , whereinthe removal unit removes the ambient noise and/or the device property from the second acoustic signal, based on acoustic signals observed from a plurality of persons. 5. The personal authentication device according to claim 1 , wherein the acoustic signal transmission unit transmits an acoustic signal for bone conduction, as the first acoustic signal, andthe acoustic signal observation unit observes an acoustic signal after the first acoustic signal propagates through the part of the head by bone conduction, as the second acoustic signal. 6. The personal authentication device according to claim 1 , comprisinga noise estimation unit implemented at least by the hardware and which estimates a noise signal, based on an acoustic signal observed by the acoustic signal observation unit, wherein the acoustic signal transmission unit transmits an acoustic signal of a frequency band different from a frequency band of the noise signal estimated by the noise estimation unit, as the first acoustic signal from next time. 7. The personal authentication device according to claim 1 , wherein the acoustic signal transmission unit changes the first acoustic signal regularly or irregularly. 8. The personal authentication device according to claim 1 , whereinthe acoustic signal transmission unit transmits acoustic signals a plurality of times; and the removal unit averages two or more observed acoustic signals and removes the ambient noise and/or the device property from the second acoustic signal using an average value of the observed acoustic signals. 9. A personal authentication method comprising:transmitting a first acoustic signal to a part of a head of a user; observing a second acoustic signal which is an acoustic signal after the first acoustic signal propagates through the part of the head; calculating by an information-processing device, an acoustic property from the first acoustic signal and the second acoustic signal; identifying the user, by the information-processing device, based on the acoustic property or a feature value extracted from the acoustic property and relating to the user; transmitting a transmission acoustic signal used for removing ambient noise and/or a device property not dependent on the positional difference in the head to a right ear canal and a left ear canal of the user, or pinnae of the user simultaneously; and removing the ambient noise and/or the device property from the second acoustic signal, on the basis of at least two acoustic signals, based on the transmission acoustic signal, observed at two locations of the head. 10. The personal authentication method according to claim 9 , whereintransmitting acoustic signals a plurality of times; and averaging two or more observed acoustic signals and removing the ambient noise and/or the device property from the second acoustic signal using an average value of the observed acoustic signals. 11. A non-transitory computer readable recording medium in which a personal authentication program is recorded, the personal authentication program for causing a computer to execute:a process of calculating an acoustic property, from a first acoustic signal transmitted to a part of a head of a user and a second acoustic signal which is an acoustic signal after the first acoustic signal propagates through the part of the head; a process of identifying the user, based on the acoustic property or a feature value extracted from the acoustic property and relating to the user; a process of transmitting a transmission acoustic signal used for removing ambient noise and/or a device property not dependent on the positional difference in the head to a right ear canal and a left ear canal of the user, or pinnae of the user simultaneously; and a process of removing the ambient noise and/or the device property from the second acoustic signal, on the basis of at least two acoustic signals, based on the transmission acoustic signal, observed at two locations of the head.
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