In this paper, a computer assisted language training system, focusing on speech input and output, is described. The system is intended to help students of foreign language (typically Japanese or English) to improve their pronunciation, with an emphasis on prosodic features of speech. The system incorporates a combination of speech processing techniques, in order to analyze the input speech, and to produce effective speech feedback. The system is implemented on a Unix PC, with audio I/O capability, in a window environment.