Based on improved PVI objective evaluation system of English sentences

The general knowledge of English pronunciation and intonation are introduced to explore the ways to improve the domestic English learners' pronunciation and intonation. Besides, it is used to help learners handle the speech prosody better, especially in sentence stress and rhythm. An objective evaluation system of English sentences was established, which extracts the energy characteristics, marks the stressed syllables, and evaluates the test sentence by using the improved PVI (Pairwise Variability Index).

I. Introduction

With the advances in speech recognition technology, Computer-Assisted Language Learning (CALL) [1]–[2] has become a hot research interest, and the objective automatic evaluation of pronunciation quality is the core technology of computer-assisted language learning (CALL) system [3]. This technology will change the existing language learning environment and the teaching mode, greatly enhancing the efficiency of language learning. In language pronunciation learning, timely, accurate, objective evaluation and feedback can help learners find the gap between the standard pronunciation and their own pronunciation and correct the pronunciation errors.