On field experiments of continuous digit recognition over the telephone network
Daniele Falavigna, Roberto Gretter · 1997
In this paper a continuous digit recognizer over the telephone network in real time will be described. The activity has allowed the realization of a system, installed in some Italian telephone exchanges, for providing semi-automatic collect call services. Data collection has also been performed, and a field database was built. Either a continuous digit recognition task and a confirmation task, requiring rejection, have been defined. Recognition results are presented. INTRODUCTION The activity reported in this paper led to the realization of a system, installed in some Italian telephone exchanges. It provides two semi-automatic collect call services, called "Italy Direct" and "170". These systems require the recognition of digit sequences, as well as of yes/no. In the last case rejection of unforeseen sentences must be used to assure sufficient robustness with respect to user inexperience. To train and test the system some telephone speech databases, later described, have been used. I...