ATTACKS PROJECT
Actual state
The IDIAP speaker verification application was developed with the Swiss Telecom PTT, the goals were to
provide a multilingual demonstrator on speaker verification for the
Telecom 95 Meeting at Geneva in October 1995 (organized by ITU). The demonstrator is
software based, this imply no special speech processing hardware. The
Demonstrator uses 2 level of verification, Text dependent and text
independent speaker recognition. The actual demonstrator works on Sun
sparc station. The verification process takes about 10s on a Sun sparc
station 20 with 4 processors.
At the first level the customer is asked to say his code (7 digits) a
speech recognition will segment the speech data in order to proceed to
a text dependent verification. If this first step fails ( emit a
doubtful decision) the speaker is asked to utter a sentence, a text
independent verification is performed and the final decision is taken.
Actually 3 text dependent verification algorithms are used. All the
algorithms are processed in parallel, each algorithm gives a decision
and a confidence on its decision. finally these partial decisions are
combined to take an accepted, rejected or doubtful decision.
In case of doubtful text dependent decision 2 text independent algorithms
are processed and the final accepted or rejected decision is taken.
Before the customer can access his account, he has to follow an
enrolment procedure where he is asked to say 5 times his code and to
say 2 sentences.
Future state
Speed improving is the first planed work, in a second step the
amelioration of robustness against noise for the verification and the
recognition process is planed. Finally the Addition of new
verification methods is also planed. This project actually goes on
three European projects CAVE, M2VTS,
and COST250.