Personal homepage
I am a scientist researcher at CNRS, working on automatic speech recognition.
I belong to the PAROLE
research team in the LORIA
UMR 7503
French
laboratory.
My detailed CV can be accessed
on the left column.
Talking to computers is an old dream, but despite all the efforts that
have been spent on this research area, nowadays achievements are
extremely far from what was expected.
We can find today speech recognition systems mainly in mobile phones,
for example to find a phone number by saying the name of someone, or in
automatic call routing applications, or yet in dictation systems.
However, all these applications suffer from serious drawbacks: need to
train the system for a long time, lack of robustness to noise, very
limited domain, small vocabulary, ...
... And above all, the main limitation of the computer is that it
simply can not associate any meaning to the speech sounds it tries to
transcribe, and we now know that higher-level information such as
semantic or syntactic is important to better transcribe, to choose
between several alternative words that have similar phonemes: this is
something that we are doing (unconsciously) all the time !
I have worked for a long time on improving robustness of speech recognition systems to noise by adapting acoustic models to noise, or by isolating the noise contribution in narrow frequency bands, for example in the multi-band architecture or with missing data recognition.
Another research area on which
I have worked for several years is to
study and design speech and multimodal interaction systems for ambiant
intelligence platforms, also known as ubiquitous or pervasive
computing. In such a context, speech interactions are rarely direct
human-machine interactions, but are generally implicit (or transparent)
, i.e., are derived from observations of the user.
I have particularly worked on the concept of implicit speech
interactions, which consists in computing context-related information
from the speech input and the conversations between users. Autonomy and
permanency requirements of ubiquitous platforms also impact the way we
interact with computers.
Contact
cerisara@loria.fr
03 54 95 86 25
LORIA, tranche C
Campus Scientifique - BP 239 - 54506 Vandoeuvre-les-Nancy Cedex
Christophe Cerisara