Digital Signal Processing Reference
In-Depth Information
Figure 6-1.
System Architecture.
The diagram also shows the other modules of the VICO system. It is
worth noting that the Car Wide Web (CWW) module is an interface to a set of
databases using an XML-Schema based protocol to communicate with the
DM module. Presently, it allows a fast access to a tourist database that
includes most of the relevant information about the italian Trentino region
(produced by Azienda per la Promozione Turistica del Trentino) and to a
geographical-topographical database (produced by TeleAtlas) for any query
concerning navigation.
The dialogue between the system and the user is based on information
resident in static or dynamic databases. A static database may contain
historical information regarding a city being visited, a dynamic database
(through an Internet connection) may contain weather news or could allow a
hotel reservation. CWW primary task is to understand the queries coming
from the DM and to retrieve the data from the databases. The actual
connection to the data is delegated to a specific API, so CWW maintains a
certain independence from the physical structure of the databases.
2.1
Front-end processing
Basic noise reduction algorithms are an easy and effective way to reduce
mismatch between noisy conditions and clean HMMs, and can also be used
with some benefits in matched conditions, as was shown in [9]. On the basis
