Voice Quality Assessment of Vocoders in Tandem Configuration

摘要

This report describes the objective testing of various vocoders, both singly andin different combinations of tandem configurations, to evaluate overall voice quality in an objective manner. The objective test evaluation was performed using a standardized (and patented) objective voice quality estimation algorithm developed by the Institute for Telecommunication Sciences (ITS). This method determines an auditory distance (AD) and converts it to a finite scale that can be related to the mean opinion score (MOS) scale commonly used in subjective voice quality tests. This testing establishes the feasibility (from a voice quality perspective) of using vocoders in a tandem configuration in order to relay voice communications between disparate systems.