Perception of synthetic speech produced automatically by rule: Intelligibility of eight text-to-speech systems

We present the results of studies designed to measure the segmental intelligibility of eight text-to-speech systems and a natural speech control, using the Modified Rhyme Test (MRT). Results indicated that the voices tested could be grouped into four categories: natural speech, high-quality synthetic speech, moderate-quality synthetic speech, and low-quality synthetic speech. The overall performance of the best synthesis system, DECtalk-Paul, was equivalent to natural speech only in terms of performance on initial consonants. The findings are discussed in terms of recent work investigating the perception of synthetic speech under more severe conditions. Suggestions for future research on improving the quality of synthetic speech are also considered.     

Program evaluation and system change: Some issues and considerations

This paper explores some of the issues concerning the acceptance or rejection of positive program evaluation data by the system in which the program is embedded. System acceptance and diffusion rates are considered as functions of first- or second-order change factors. Several approaches to enhancing the probability of second-order change are presented and discussed.