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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了直升机的声线谱；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 helicopter flight noise and its frequency domain characteristics are briefly introduced. The extraction technology of acoustic signal characteristics is discussed. The method of information processing based on pattern recognition was used to estimate the helicopter’s sound ray spectrum with AR model parametric spectrum estimation algorithm. The quadratic approximation method was used to extract the helicopter’s sound ray spectrum characteristics quickly and effectively to construct the characteristic matrix. Recognition in the syntactic analysis of the sound target for effective judgments, identify, and the preparation of the corresponding procedures, given the analysis results, the effect is good.