A speaker verification system using the voice of a user uttering a continuous, random length digit string is provided. The speaker verification system includes a random digit generator for generating a continuous, random length digit string; a user interface for providing the continuous, random length digit string; a feature extractor for extracting voice features from the user's voice uttering the continuous, random length digit string; a digit voice verification unit for comparing the voice features with items in a speaker-independent continuous digit voice model to derive a digit string corresponding to items in the speaker-independent continuous digit voice model, which match the voice features, and for determining whether the derived digit string is identical to the digit string provided to the user via the user interface; and a speaker verification unit for comparing the voice features with a speaker-dependent model of the user to measure the similarity between them. The speaker-dependent model of the user includes previously determined features of the users' voice and determines whether to approve or reject the user based on the similarity.
A system for verifying and enabling user access, which includes a voice registration unit for providing a substantially unique and initial identification of each of a plurality of the speaker/users by finding the speaker/user's voice parameters in a voice registration sample and storing same in a database. The system also includes a voice authenticating unit for substantially absolute verification of an identity of one of said plurality of users. The voice authenticating unit includes a recognition unit for providing a voice authentication sample, and being operative with the database. The voice authenticating unit also includes a decision unit operative with the recognition unit and the database to decide whether the user is the same as the person of the same identity registered with the system, such that the identity of one of the plurality of users is substantially absolutely verified.
