直升机声信号特征提取和识别技术

简要介绍了直升机的飞行噪声和它的频域特征，论述了声信号特征的提取技术，采用基于模式识别的信息处理方法，用ＡＲ模型参数谱估计算法高质量地估计一直升机的声线谱；用二次近似法快速有效地提取了直升机的声线谱特征，构成特征矩阵；用模式识别中句法分析方法对声目标进行有效的判决、识别，并编写了相应的程序，给出了分析结果，效果良好。

THE EXTRACTION AND RECOGNITION OF SONIC-SIGNALS FROM HELICOPTERS

The in-flight sonic noise of helicopters and its characterization in frequency domain are briefly presented,and followed by a discussion on the extraction of charac-teristics of sonice-signal.Adopting signal processing based on modal recognition,the line spectrum of helicopter sonic noice is obtained through AR modal parameter spec-trum estimation attaining a high quality.The characteristics of line spectrum can be ob-tained quickly and effectively by 2nd order approximation,forming characteristic matri-ces,and the sonic-target recognized effectively by way of syntactic analysis in modal recognition.The results of analysis obtained in this way appear to be satisfactory.