Partners and International Organizations
(English)
|
IRISA (F), KTH (S), KUN (NL), ENST (F), UBS-Ubilab (CH), IDIAP (CH)
|
Abstract
(English)
|
Speaker verification concerns the access control and user authentication through voice prints, more specifically verifying the claimed identity of a user through his/her voice. In this framework, the present PICASSO project was about the development, testing, and improvement of state-of-the-art speaker verification approaches, in the framework of telecom (through our industrial partners Swisscom. CH, and KPN, NL) and banking (through Ubilab, CH, and Fortis, NL) applications. More specifically, PICASSO had two principal objectives:
1. Formal evaluation of the performance, and resulting acceptability by the users, of a state-of -the- art system on real task scenarios (as referred above). The initial system. resulting from a previous EC project (CA VE) in which illIAP significantly contributed, has indeed been shown yielding state-of-the-art performance in the framework of NIST (National Institute of Stamard and Technology, USA) international evaluation campaigns.
2. Development of a demonstration and real time prototype system. which could be exploited by Vocalis, an English speech vendor also partner of the project.
During the course of PICASSO, several research directions were investigated by illIAP, resulting in significant improvements of the above state-of-the-art system, including:
1. Incremental enrolment: allowing online/unsupervised adaptation of the parameters of each customer model, resulting in incremental adaptation and improvement of the system.
2. Synchronous alignement: allowing to use speaker independent models to boost and improve speaker specific models.
3. Improvement of the score normalization (hypothesis testing) and decision strategy. More recently,
this was also further improved by using new machine learning approaches, such as Support Vector machine.
4. User customized password, allowing each user to choose his/her own password, simply by pronouncing it a few times.
All this resulted in a re-usable software package which is still in use today at illIAP.
|
