Patent Document ID: 20090187404
Application ID: 12016622
Patent Flag: 0

Claim One:
1. A large-scale attendance, productivity, activity and availability biometric control method using the telephone network, for individual client users at their work places, with speaker verification technology based on limited enrolling data and short verification sentences, wherein said method comprises the steps of: registering one or more system clients by entering, for each system client, a user name for a client user, an enrolling/verification sentence, a personal identification number (PIN) associated to the client user and a telephone number from where a subsequent enrolling and verification steps will take place; enrolling the client user comprising requesting each client user to enter the associated PIN and to pronounce the enrolling/verification sentence, thereby providing voice signals; generating a template and a reference average spectrum according to equation ( 1 ) with the voice signals provided by the user in the enrolling step; and storing and indexing the template and the reference average spectrum with the PIN associated to the client user; prompting the client user during a future verification event to enter the PIN and to pronounce the enrolling/verification sentence associated with the PIN, thereby providing a speech signal; estimating a verification distance, in the future verification event, between the template indexed by the entered PIN and the speech signal pronounced by the client user; using the reference average spectrum indexed by the entered PIN; validating that the telephone number employed in the future verification event is the same as the telephone number employed in the enrolling step; deciding if the speech signal pronounced by the client user has been validated based on the verification distance; repetiting the steps of prompting, estimating, validating and deciding for a limited number of times, if the speech signal pronounced by the client user fails validation; and accepting or rejecting the future verification event