Patent ID: 7657431

Claim:
A text-dependent voice authentication system that performs authentication by receiving a keyword which a user inputs by voice, comprising: an input part that receives a voice input of a keyword from the user, said keyword is divided into a plurality of portions with an utterable unit which is a minimum unit, said voice input is carried out over a plurality of times at a time interval for each of the portions; a speaker model storage part that previously stores a registered keyword of the user as a speaker model created in the utterable unit; a feature value conversion part that obtains a feature value of a voice from a portion of the keyword which is received by each voice input in the input part; a similarity calculation part that obtains a similarity between the feature value obtained in the feature value conversion part and the speaker model; a speech content determination part that determines information on a speech content by the plurality of times of voice inputs, based on the similarity obtained in the similarity calculation part; a keyword checking part that determines whether or not the speech content of the plurality of times of voice inputs is capable of configuring an entire registered keyword, based on the information on the speech content determined in the speech content determination part; and an authentication determination part that determines whether to accept or reject authentication, based on a determination result in the keyword checking part and the similarity obtained in the similarity calculation part.