Speaker verification method using group normalization scoring

PURPOSE: To provide a method for verifying the assertion of identification performed by individual subscribers based on signals for indicating utterance provided by the subscriber relating to speaker verification as a voice processing. CONSTITUTION: A telephone call is made possible to be connected just by orally notifying of a label for identifying a desired call destination by a caller, and the telephone call is made possible to be charged to a specified charging account just by orally notifying of the label for identifying the charging account. The caller makes the call by dialing or orally giving the telephone number of the call destination or by inputting an abbreviated dial code relating to the telephone number. The equipment is provided with a speaker verification system adopting group normalization scoring. The group normalization scoring provides a dynamic threshold value to a verification process and further resistance force to fluctuation in training utterance and verification utterance is supplied to the process. The fluctuation is due to the fluctuation of the size of the voice of the speaker or communication channel characteristics. COPYRIGHT: (C)1994,JPO