Online oral English teaching system based on speech recognition technology and machine learning

To enhance the intelligence of pronunciation error detection and feedback precision in online oral English teaching, this study designs a system combining speech recognition and machine learning.Its core detection module uses the MFCC-DBN model with feature fusion, and builds an SVM-based multi-classifier.Experimental data comes from the CSTR VCTK Corpus and the speech accent archive, containing 1,610 expert-annotated phoneme samples.The model yields high accuracy for both sample-sufficient and small-sample error types.Compared with LDA-SVM and Wav2Vec2.0-SVM, it outperforms them in accuracy and standard error.Results prove the fusion model's stronger robustness and efficiency with limited data, offering a practical technical approach to boost learners' cross-cultural communication competence.