User authentication system, fraudulent user determination...

Details User authentication system, fraudulent user determination... User authentication system, fraudulent user determination...

2011-05-24

2011-05-24

Rider, Justin W (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

Application

C379S093030, C704S200000, C704S220000

Reexamination Certificate

active

07949535

ABSTRACT:
A system and method is provided for easily detecting a fraudulent user who attempts to obtain authentication using voice reproduced by a reproducer. A personal computer is provided with an audio data obtaining portion for picking up ambient sound around a person as a target of user authentication using voice authentication technology during a period before the person utters, and a fraud determination portion for calculating an intensity level showing intensity of the picked-up ambient sound per predetermined time for each of sections into which the period is divided and for determining that the person is a fraudulent user who attempts to obtain authentication using reproduced voice, when, of two of the calculated intensity levels, the intensity level of the later section is larger than a sum of the intensity level of the earlier section and a predetermined value.

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