Biometric authentication device, biometric authentication method, and recording medium

Abstract

A biometric authentication device is provided with: a replay unit for reproducing a sound; an ear authentication unit for acquiring a reverberation sound of the sound in an ear of a user to be authenticated, extracting an ear acoustic feature from the reverberation sound, and calculating an ear authentication score by comparing the extracted ear acoustic feature with an ear acoustic feature stored in advance; a voice authentication unit for extracting a talker feature from a voice of the user that has been input, and calculating a voice authentication score by comparing the extracted talker feature with a talker feature stored in advance; and an authentication integration unit for outputting an authentication integration result calculated based on the ear authentication score and the voice authentication score. After the sound is output into the ear, a recording unit inputs the voice of the user.

What is claimed is: 
     
         1 . A biometric authentication device comprising:
 a memory storing instructions; and   at least one processor configured to execute the instructions to perform:   reproducing a sound;   acquiring a reverberation sound of the sound in an ear of a user to be authenticated, extracting an ear acoustic feature from the reverberation sound, and calculating an ear authentication score by comparing the extracted ear acoustic feature with an ear acoustic feature stored in advance;   extracting a talker feature from a voice of the user that has been input, and calculating a voice authentication score by comparing the extracted talker feature with a talker feature stored in advance; and   outputting an authentication integration result calculated based on the ear authentication score and the voice authentication score, wherein   after the sound is output into the ear, the voice of the user is input.   
     
     
         2 . The biometric authentication device according to  claim 1 , wherein
 the at least one processor is further configured to execute the instructions to perform:   simultaneously notifying the user of operation start of the ear authentication and the voice authentication.   
     
     
         3 . The biometric authentication device according to  claim 2 , wherein
 the at least one processor is configured to execute the instructions to perform:   starting the voice authentication, when triggered by reception of a reverberation sound recording completion notification that delivers completion of the input of the reverberation sound.   
     
     
         4 . The biometric authentication device according to  claim 2 , wherein
 the at least one processor is further configured to execute the instructions to perform:   recording the reverberation sound and the voice of the user, wherein   simultaneously with starting the ear authentication, starting recording the voice of the user after waiting for a time length necessary for recording the reverberation sound.   
     
     
         5 . The biometric authentication device according to  claim 2 , wherein
 when it is detected that either of the ear authentication and the voice authentication is abnormal, weighting an authentication score of either of the ear authentication and the voice authentication that is not abnormal.   
     
     
         6 . A biometric authentication method comprising:
 acquiring a reverberation sound of a sound in an ear of a user to be authenticated, extracting an ear acoustic feature from the reverberation sound, and calculating an ear authentication score by comparing the extracted ear acoustic feature with an ear acoustic feature stored in advance;   extracting a talker feature from a voice of the user that has been input, and calculating a voice authentication score by comparing the extracted talker feature with a talker feature stored in advance; and   outputting an authentication integration result calculated based on the ear authentication score and the voice authentication score, wherein   after the sound is output into the ear, the voice of the user is input.   
     
     
         7 . A non-transitory recording medium having a biometric authentication program stored thereon,
 the biometric authentication program comprising:   acquiring a reverberation sound of a sound in an ear of a user to be authenticated, extracting an ear acoustic feature from the reverberation sound, and calculating an ear authentication score by comparing the extracted ear acoustic feature with an ear acoustic feature stored in advance;   extracting a talker feature from a voice of the user that has been input, and calculating a voice authentication score by comparing the extracted talker feature with a talker feature stored in advance; and   outputting an authentication integration result calculated based on the ear authentication score and the voice authentication score,   the biometric authentication program causing a computer to enable that   after the sound is output into the ear, the voice of the user is input.