PROGRESS IN DEPLOYMENT AND FURTHER DEVELOPMENT OF THE NYNEX VOICEDIALING(SM) SERVICE

As was reported at IVTTA-94, the NYNEX VoiceDialing(SM) service was fi rst deployed in the NYNEX region in mid 1993. It has since been deploy ed in several other Bell Operating Companies' regions and substantial new developments have taken place. One of them was a transition, start ing in 1995, from the hardware implementation of a DTW-based recogniti on algorithm to the implementation, on a general-purpose DSP, of a con tinuous density multi-Gaussian mixture HMM-based algorithm. As a resul t, it has been possible to expand the service beyond speaker-dependent name recognition to speaker-independent continuous digit recognition (SICDR) and voice-activated network control (VANC) command recognition . This paper highlights major efforts in this transition and provides a more detailed description of the system's speech recognition compone nts. (C) 1997 Published by Elsevier Science B.V.