基于序列匹配的英语口语测试自动评分系统设计

Design of an automatic scoring system for oral english test based on sequence matching

为了提高对英语口语自动测试能力,进行英语口语自动测试系统设计,提出一种基于序列匹配的英语口语测试自动评分系统设计。采用语音信号处理方法进行英语口语测试自动评分系统的算法设计,采用时间序列分析方法进行英语口语的语音信号采集,对采集的英语口语发音序列采用判决反馈均衡调节方法进行语音混频处理,提取英语口语发音序列的统计信息特征量,采用相关函数特征匹配方法进行英语口语发音序列的状态评估和标准性对比,提取英语口语发音序列的谱特征量,对提取的英语口语发音序列谱特征量与标准发音特征量进行匹配分析,根据对比的差异性实现英语口语的自动测试和评分。将英语口语的发音序列匹配算法加载到硬件模块中,结合DSP设计进行英语口语测试自动评分系统的硬件开发设计。测试结果表明,采用该系统能有效实现英语口语的自动评分,评分结果准确可靠,系统的稳定性较好。

In order to improve the ability of automatic testing of spoken English,an automatic test system for oral English based on sequence matching is designed.The speech signal processing method is used to design the automatic scoring system for oral English test,and the time series analysis method is used to collect the spoken English speech signal.A decision feedback equalization method is used to deal with the collected spoken English pronunciation sequence,and the statistical information characteristic quantity of the English spoken speech pronunciation sequence is extracted.The correlation function feature matching method is used to evaluate and compare the state of spoken English pronunciation sequence and to extract the spectral feature quantity of spoken English pronunciation sequence.The matching between the extracted phonetic sequence spectrum feature quantity and the standard pronunciation feature quantity is analyzed,and the automatic test and score of spoken English are realized according to the contrast difference.The phonetic sequence matching algorithm of spoken English is loaded into the hardware module,and the hardware development of the automatic score system for oral English test is carried out with DSP design.The test results show that the system can effectively realize the automatic scoring of spoken English,the scoring results are accurate and reliable,and the stability of the system is good.