Personal authentication device, personal authentication method, and recording medium

Abstract

To provide a personal authentication device capable of simply securing security with little psychological and physical burden of a user to be authenticated. Personal authentication device 300 includes: Transmission unit 31 that transmits a first acoustic signal to a part of a user's head; Observation unit 32 that observes a second acoustic signal that is an acoustic signal after the first acoustic signal propagates through the part of the user's head; Calculation unit 33 that calculates acoustic characteristics from the first acoustic signal and the second acoustic signal; Extraction unit 34 that extracts a feature amount related to a user from the acoustic characteristics; Storage control unit 35 that registers the feature amount in the storage unit as a first feature amount; Identification unit 36 that identifies the user by collating the first feature amount acquired from the storage unit with a second feature amount acquired after the extraction of the first feature amount from the extraction unit; Storage unit 37 stores the first feature amount, wherein while Identification unit 36 identifies the user as being identical, Transmission unit 31 transmits the first acoustic signal every predetermined interval.

1 . A personal authentication device comprising:
 one or more memories storing instructions; and   one or more processors configured to process the instructions to:   transmit a first acoustic signal to a part of a head of a user;   observe a second acoustic signal that is an acoustic signal after the first acoustic signal propagates through the part of the head of the user;   calculate acoustic characteristics from the first acoustic signal and the second acoustic signal;   extract a feature amount related to the user from the acoustic characteristics;   register the feature amount in a storage means as a first feature amount; and   identify the user by collating the first feature amount registered in the storage with a second feature amount extracted in the extraction after the first feature amount is registered,   wherein, when the user is identified as being identical, the first acoustic signal is transmitted every predetermined interval.   
     
     
         2 . The personal authentication device according to  claim 1 , wherein the processors further process the instructions to:
 provide a service to the user when the user is identified as being identical in the identification.   
     
     
         3 . The personal authentication device according to  claim 1 , wherein, when the user is not identified as being identical in the identification, the providing of the service is stopped and the first feature amount registered in the storage is deleted. 
     
     
         4 . The personal authentication device according to  claim 1 , wherein the processors further process the instructions to:
 when the user is not identified as being identical in the identification, emit light in a color different from a color when the user is identified as being identical.   
     
     
         5 . The personal authentication device according to  claim 2 , wherein the processors further process the instructions to:
 detect whether a specified time has passed,   when the user is identified as being identical in the identification and it is detected that the specified time has passed, the providing of the service to the user is stopped.   
     
     
         6 . The personal authentication device according to  claim 5 , wherein, when it is detected that the specified time has passed, emitting light in a color different from a color when the specified time has not passed. 
     
     
         7 . A personal authentication method comprising:
 transmitting a first acoustic signal to a part of a head of a user;   observing a second acoustic signal that is an acoustic signal after the first acoustic signal propagates through the part of the head of the user;   calculating acoustic characteristics from the first acoustic signal and the second acoustic signal;   extracting a feature amount related to the user from the acoustic characteristics;   registering the feature amount in a storage as a first feature amount; and   identifying the user by collating the first feature amount registered in the storage with a second feature amount extracted after the first feature amount is registered,   wherein, when the user is identified as being identical, the first acoustic signal is transmitted every predetermined interval.   
     
     
         8 . The personal authentication method according to  claim 7 , further comprising:
 providing a service to the user when the user is identified as being identical.   
     
     
         9 . The personal authentication method according to  claim 7 , wherein, when the user is not identified as being identical, the providing of the service is stopped and the first feature amount registered in the storage is deleted. 
     
     
         10 . The personal authentication method according to  claim 7 , further comprising:
 when the user is identified as being identical, emitting light in a color different from a color when the user is identified as being identical.   
     
     
         11 . The personal authentication method according to  claim 8 , further comprising:
 detecting whether a specified time has passed,   when the user is identified as being identical and it is detected that the specified time has passed, the providing of the service to the user is stopped.   
     
     
         12 . The personal authentication method according to  claim 11 , wherein, when it is detected that the specified time has passed, emitting light in a color different from a color when the specified time has not passed. 
     
     
         13 . A non-transitory computer readable recording medium stored with a personal authentication program causing a computer to perform:
 transmitting a first acoustic signal to a part of a head of a user;   observing a second acoustic signal that is an acoustic signal after the first acoustic signal propagates through the part of the head of the user;   calculating acoustic characteristics from the first acoustic signal and the second acoustic signal;   extracting a feature amount related to the user from the acoustic characteristics;   registering the feature amount in a storage as a first feature amount; and   identifying the user by collating the first feature amount registered in the storage with a second feature amount extracted after the first feature amount is registered,   wherein, when the user is identified as being identical, the first acoustic signal is transmitted every predetermined interval.   
     
     
         14 . The recording medium according to  claim 13 , further comprising:
 providing a service to the user when the user is identified as being identical.   
     
     
         15 . The recording medium according to  claim 13 , wherein, when the user is not identified as being identical, the providing of the service is stopped and the first feature amount registered in the storage is deleted. 
     
     
         16 . The recording medium according to  claim 13 , further comprising:
 when the user is identified as being identical, emitting light in a color different from a color when the user is identified as being identical.   
     
     
         17 . The recording medium according to  claim 14 , further comprising:
 detecting whether a specified time has passed,   when the user is identified as being identical and it is detected that the specified time has passed, the providing of the service to the user is stopped.   
     
     
         18 . The recording medium according to  claim 17 , wherein, when it is detected that the specified time has passed, emitting light in a color different from a color when the specified time has not passed.