基于动态匹配词格检索的关键词检测

摘要

The large amount of speech data requires techniques for rapid and accurate search. This paper proposes a keyword spotting method based on dynamic match Lattice spotting (DMLS). It generates more ac-curate phone Lattice with TRAP features and multilayer perceptron, and performs a modiifed Viterbi traversal to compile a database of ifxed-length phone sequences in speech indexing. In the searching stage, a minimum edit distance is used as the conifdence score to implement the keyword spotting. Tests show that the proposed method is superior to baseline systems with MFCC and PLP features with the recall rate improved by about 5%.%对生活中涌现的海量语音数据需要进行快速而准确的检索.提出一种基于动态匹配词格检索的关键词检测方法，应用TRAP特征和多层感知器创建更为精准的音素Lattice.在索引阶段执行一个改进的维特比算法遍历Lattice来创建一个固定长度的音素序列数据库，在检索阶段应用最小编辑距离作为置信度来实现关键词的检出.实验结果表明，该方法相比应用MFCC和PLP特征的基线系统具有一定的优势，召回率可提升5%左右.