Implementation of voice synthesis algorithm using redundant bit reduction technique for the text editing type recorded announcements

The speech synthesis techniques applicable to the recorded announcements of an ESS (electronic speech synthesis) system are discussed with regard to high-quality text-editing-type synthesis at a medium data rate (10-20 kbps). The hybrid coding techniques are useful for solving certain problems, but are not desirable for the word-based synthesis due to pitch change. The authors propose a hybrid coding scheme that can control the pitch and the data rate according to the quality. This technique is applied to a synthesis algorithm for the recorded announcements of the ESS switching system in Korea